D11R TRACK-TYPE TRACTOR D11R CD CARRYDOZER ELECTRO-HYDRAULIC IMPLEMENT SYSTEMS
D11R TRACK-TYPE TRACTOR D11R CD CARRYDOZER ELECTRO-HYDRAULIC IMPLEMENT SYSTEMS MEETING GUIDE 714 SLIDES AND SCRIPT AUDIENCE Level II--Service personnel who understand the principles of machine systems operation, diagnostic equipment, and procedures for testing and adjusting.
CONTENT This presentation describes the operation of the electronically controlled implement systems for the D11R Track-type Tractor and the D11R CD Carrydozer. The functions and operation of the keypad are also covered.
OBJECTIVES After learning the information in in this presentation, the serviceman will be able to: 1. 2. 3. 4. 5.
locate and identify all major components in the implement systems; locate and identify all filters, drains, and test points; explain the operation of each component in the implement systems; trace the flow of oil through the implement hydraulic system; and use the keypad to select the operating parameters and system features.
REFERENCES D11R CD Track-type Tractor Service Manual (AAF 1-Up) D11R Track-type Tractor Service Manual (7PZ 1-Up)
RENR3665 RENR2095
PREREQUISITES Interactive Video Course "Fundamentals of Mobile Hydraulics" (CD ROM) STMG 546 "Graphic Fluid Power Symbols"
TEMV9001 SESV1546
SUPPLEMENTARY TRAINING MATERIAL STMG 700 "D11R CD Carrydozer--Implement Systems" Video Tape "D11R Track-type Tractor/D11R CD Carrydozer--Introduction" Booklet "VIDS Message Center and Keypad Operator Instruction"
INTRODUCTION This presentation discusses the major design features of the implement systems for the D11R Track-type Tractor and the D11R CD Carrydozer (Serial Numbers AAF 1-Up and 7PZ 1-Up). The D11R and the Carrydozer are elevated sprocket design tractors equipped with the Power Train Electronic Control System, Finger Tip Control steering, Electronic Implement Control, and Vital Information Display System (VIDS). ¥ 3508B engine
These machines are powered by the 3508B turbocharged and aftercooled engine rated at 634 kW (850 hp) with a 25 percent net torque rise for excellent lugging performance. The power from the engine is transferred through a torque divider that provides maximum torque multiplication during heavy loading.
TILT PUMP PRESSURE SENSOR ENGINE OVERSPEED SIGNAL (FROM ENGINE ECM)
PRESSURE COMPENSATION OVERRIDE SOLENOID VALVE
2 ELECTRONIC CONTROL SYSTEM ¥ Electronic Control System
The Implement Electronic Control System controls the hydraulic pilot valves for the blade and ripper attachments. The Implement Electronic Control Module (ECM) receives operator requests from the blade control lever and the ripper control lever. The ECM responds by energizing the appropriate pilot solenoid valves on the electro-hydraulic manifold. The proportional solenoid valves control the amount of pilot oil that is sent to the dozer or ripper control valves to shift the appropriate spools and direct main pump oil to the head or rod end of the cylinders. The ECM controls the blade height, blade tilt, blade pitch, ripper height, and ripper shank in or out functions. Certain repetitive blade and ripper tasks can be performed automatically by the ECM. The operator selects these automatic functions through the keypad. The automatic functions will be discussed later in this presentation.
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4 6
2
3 1
5
7 8
3
¥ Component identification:
1. Blade control handle 2. Blade PITCH lever
3. Mode select button
The implement control handles for the D11R and the D11R CD are not mechanically connected to the dozer and ripper control valves. The blade control handle and the ripper control handle are input devices to an Electronic Control Module (ECM) located below the implement control handle. Moving the blade control handle (1) forward or rearward LOWERS or RAISES the blade. Moving the handle left or right allows the blade to TILT LEFT or TILT RIGHT. The thumb lever (2) allows the operator to PITCH the blade forward or rearward. The left button (3) on the blade control handle allows the operator to activate the Automatic Modes. After the blade is loaded or the dig cycle is complete, the first push of the left button allows the blade to PITCH to an operator preset carry position. The carry pitch position is set through the Vital Information Display System (VIDS) keypad. The second push of the left button begins the SPREAD portion of the cycle. The blade will RAISE and PITCH FORWARD automatically to the operator preset pitch position. On the Carrydozer, the lift cylinders will also raise to compensate for the change in pitch and lift the blade at the pre-selected rate. The Automatic Control feature will be suspended if the operator overrides the automatic function. The exception to this condition is Auto Spread. Auto Spread allows the operator to temporarily PITCH or RAISE without interrupting the Automatic Control settings.
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The right button (4) cancels the Automatic Mode, and the blade may be controlled manually. Located on the front of the blade control handle is a trigger switch (not shown). When this switch is engaged, the blade will PITCH FORWARD to dump the blade load. This switch performs the same function as the thumb lever (2) when moved to the right.
5. Ripper RAISE or LOWER lever 6. SHANK IN or OUT lever 7. Ripper Auto Stow switch 8. Implement lockout switch
The ripper controls are located to the rear of the blade control handle. Ripper RAISE and LOWER are controlled by the thumb switch (5) at the front of the ripper control handle. The finger switch (6) allows the operator to control SHANK IN and SHANK OUT. Pushing the button (7) on the ripper control raises the ripper to maximum height or moves the ripper tip to the full SHANK IN position if selected through the SET MACH and 4:AUTOSTOW CONFIG on the VIDS keypad. Located to the rear of the ripper controls is a lockout switch (8) that disables the implement pilot pressure. If the implement lockout switch is switched to the locked position, the VIDS display will read IMPLMTS_OFF. When the operator returns the implement lockout switch to the unlocked position, the mode will be set to MANUAL.
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IMPLEMENT HYDRAULIC SYSTEM COMPONENTS D11R TRACTOR AND D11R CD CARRYDOZER
FAN MOTOR AND MAKEUP VALVE LIFT CYLINDER POSITION SENSOR (CD) QUICK-DROP VALVE (D11R)
ECM'S HYDRAULIC TANK FAN RETURN FILTER
OIL COOLER AND BYPASS VALVE HYDRAULIC PRESSURE SENSORS
E/H FILTER
IMPLEMENT PUMP
4 HYDRAULIC CONTROL SYSTEM ¥ Continuous flow at minimum pressure with controls in HOLD ¥ Two section gear-type pump ¥ Pilot operated control valves
The implement hydraulic system for the D11R and the Carrydozer is a continuous flow design that permits minimum pressure in the system when the implement control valves are not activated. The flow for operation of the bulldozer and ripper is provided by a two section geartype pump (tilt and lift sections). The cooling oil for the hydraulic circuits is provided by the fan circuit. The pilot pressure oil for the implement system is also supplied by the fan pump. The system components include: the implement pump, electro-hydraulic pilot valve group, logic valve, demand control fan pumps, dozer control valve, dual tilt control valve, pitch regenerate valve (Carrydozer only), quick-drop valves (D11R only), and a ripper control valve. The system components control the flow of hydraulic oil to the appropriate implement cylinders.
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¥ Hydraulic tank components: - Oil fill tube - Manual air vent - Hydraulic oil filters - Sight gauge - Tank drain - Fan return filter
The hydraulic tank is located on the right fender just outside the operator's compartment. The oil fill tube and cap are located on the top of the tank. Inside the fill tube is a fine mesh screen which removes large particles of dirt or foreign material from the oil as the tank is filled. A manual air vent and the breaker relief valve are located near the filters. The vacuum breaker relief valve has a pressure setting of 3.5 kPa (.5 psi) and a pressure relief setting of 210 kPa (30 psi). Two hydraulic oil filters are located inside the tank. Also mounted at the front of the tank is a fan return filter, and below the right fender is an electro-hydraulic system filter. The oil level sight gauge on the front of the tank permits an easy check of the hydraulic system oil level. Always clean the sight gauge to be sure the oil level is visible. Dirt and stains on the glass frequently give the appearance of a full tank. NOTE: The capacity of the D11R CD hydraulic system is approximately 314 Liters (83 gal.).
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¥ Dozer control valve
The dozer control valve is located below the operator's station on the right side of the machine. Inside the control valve are two spools: One spool controls blade lift and lower, and one spool controls blade tilt. The blade lift spool and the blade tilt spool are operated by pilot oil.
¥ Pilot operated dozer lift spool
The pilot operated dozer lift spool has four positions: RAISE, HOLD, LOWER, and FLOAT. The pilot operated blade tilt spool has three positions: TILT RIGHT, HOLD, and TILT LEFT.
¥ Pilot operated blade tilt spool
The tilt circuit receives oil from the small (tilt) section of the pump. When the circuit is not in use, the oil joins the large (lift) pump section oil flow to the lift circuit. If neither circuit is in use, the dump valve opens and sends oil flow to the tank. Both the tilt and lift circuits have load check valves and relief valves. The lift circuit has makeup valves for both the rod and head ends of the lift cylinders. NOTE: When the engine rpm is low (below 800 rpm), the transmission is in NEUTRAL, and the blade control handle is in the HOLD position, the implement lockout solenoid is DE-ENERGIZED by the ECM.
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2 3 1 5
4
7
¥ Component identification: 1. Electro-hydraulic system filter 2. Main pump pressure sensor 3. Tilt pump pressure sensor 4. Hydraulic accumulator
5. Manual implement lower valve
The electro-hydraulic system filter (1) is located below the floor plate at the right of the main beam. This filter keeps debris from entering the electro-hydraulic pilot manifold. Located to the right of the filter are the main pump pressure sensor (2) and the tilt pump pressure sensor (3). Located to the left of the pump pressure sensors are corresponding pressure taps where gauges may be connected to test the pressures. Pump pressures may also be checked through the message center of the VIDS display. Located to the rear of the pressure sensors is the hydraulic accumulator (4). During rapid engine deceleration, the fan pump discharge pressure may decrease below the desired pilot pressure. The accumulator prevents the pilot pressure from decreasing below the desired pressure. The manual implement lower valve (5) is located below and to the rear of the pump pressure sensors (also on the right frame). This valve allows the operator or service technician to manually lower the implements to the ground if the electrical system is inoperative. When the valve is manually opened with the appropriate tool, the implement cylinders with the highest pressure drain to the tank, and the corresponding implement is lowered to the ground first. Then, the cylinders with the next highest pressure are drained until all implements are lowered to the ground.
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FAN DRIVE HYDRAULIC SYSTEM FAN PUMP CASE FLUSHING FLOW
RADIATOR
FAN DRIVE MOTOR
TO ELECTRO-HYDRAULIC PILOT MANIFOLD SOLENOID PILOT SUPPLY FILTER
OIL COOLER FAN PUMPS
TANK OIL COOLER BYPASS VALVE
SUCTION LINE
CASE DRAIN LINE
FAN RETURN FILTER
8 Fan Drive Hydraulic System ¥ Fan pumps part of hydraulic system
¥ Demand control fan system equipped with tandem axial pumps
The demand control fan system on the D11R and the D11R CD is considered part of the implement hydraulic system because the fan pumps pull oil from the implement hydraulic tank and send some of the oil to the electro-hydraulic pilot valve manifold group. Pilot oil hydraulically shifts the blade lift and tilt spools in the dozer control valve and also shifts the spools in the ripper control valve to control ripper lift and ripper tip. Pilot oil from the fan pumps is also used to shift the dual tilt valve on the D11R Tractor and the D11R CD Carrydozer. The spool in the pitch regenerate valve on the D11R CD Carrydozer is shifted with pilot pressure oil from the demand control fan system.
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INSTRUCTOR NOTE: The following color codes will be used throughout this presentation to identify the various pressures in the system. Red Red and White Stripes Orange Blue Green Purple Yellow
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Pump supply or main system oil Reduced pressure oil Pilot pressure oil Blocked oil Suction, return or case drain oil Nitrogen charge pressure Moving parts or activated valve envelopes
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¥ Fan pumps
The tractor is equipped with two hydraulic pumps for the demand control fan system. The tandem axial pumps are located below the floor plate on the right rear of the engine and are driven off the flywheel housing. The front pump is a variable displacement pump and the rear pump is a fixed displacement pump. The system adjusts the fan speed to match the cooling system demands based on an input signal to the engine Electronic Control Module (ECM) from the engine coolant temperature sensor.
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ELECTRO-HYDRAULIC PILOT SYSTEM HOLD
TO DOZER TILT SPOOL TO DOZER LIFT SPOOL
TILT RIPPER RIGHT/ LOWER DUMP
BLADE RAISE
RIPPER SHANK IN
IMPLEMENT LOCKOUT SOLENOID VALVE TEST PORT
TO FAN MOTOR
TO RIPPER TIP SPOOL FAN PUMPS
TO RIPPER LIFT SPOOL
TO DOZER TILT SPOOL TO RIPPER TIP SPOOL
SHUTTLE VALVE PRESSURE REDUCING VALVES
RIPPER SHANK OUT RIPPER RAISE
TILT LEFT/ RACK BLADE LOWER/FLOAT
FROM LOGIC VALVE TO DOZER LIFT SPOOL TO DOZER TILT SPOOL
10 Electro-Hydraulic Pilot System ¥ Blade functions
The implement system for the D11R and the D11R CD is operated by pilot oil. The fan pump supplies pilot oil to a manifold located below the floor plate on top of the main case. This manifold includes an ON/OFF solenoid valve that allows the implement control levers to function or blocks the flow to the electro-hydraulic "main gallery." The manifold also contains four proportional solenoid valves that control the amount of pilot oil directed to the dozer control valve. This pilot oil is sent to the ends of the tilt or lift spool and control BLADE LIFT, BLADE LOWER and FLOAT, BLADE TILT LEFT, and BLADE TILT RIGHT.
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The ECM receives a signal from the blade control handle when the operator requests a blade function. The ECM then sends an output signal to the appropriate solenoid. The solenoid valve opens proportionally to the signal received from the ECM. The higher the signal, the more the solenoid valve opens to allow more flow to the spool. When the automatic feature is activated by the operator, the ECM also sends output signals to all the appropriate solenoids simultaneously, allowing the automatic blade functions. ¥ Ripper functions
If the tractor is equipped with a ripper, the pilot manifold is equipped with two additional bolt-on blocks. These blocks contain four more proportional solenoid valves that direct pilot oil to the ripper control valve to select RIPPER RAISE, RIPPER LOWER, SHANK IN, and SHANK OUT. When the operator requests a ripper function, the corresponding ripper switch sends a signal to the ECM. The ECM then sends an output signal to the appropriate solenoid on the pilot manifold, which directs pilot oil to the appropriate spool end. The ripper control also contains an Auto Stow button. When this button is pushed by the operator, the ECM sends a signal that RAISES the ripper to the maximum height and moves the shank to the full SHANK IN position (if configured through the VIDS keypad). NOTE: The charts in Serviceman's Handouts No. 1, 2 and 3 show which solenoids are activated by the ECM when the operator requests an implement movement.
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DOZER LIFT SPOOL HOLD LIFT RELIEF VALVE FROM LIFT LIFT SECTION PUMP LIFT SPOOL
FROM PRESSURE COMPENSATION OVERRIDE SIGNAL PORT
11 Bulldozer Lift Circuit ¥ Lift spool in HOLD
The lift spool has four positions: RAISE, HOLD, LOWER, and FLOAT. The lift spool is hydraulically operated by pilot oil from the electrohydraulic pilot valve manifold. When the valve spools in both the dozer control valve and the ripper control valve are in the HOLD position, the pressure of the supply oil (from both the tilt and lift sections of the pump) through the dozer control valve is maintained at approximately 700 kPa (100 psi). Movement of the blade control handle to the rear sends an electrical signal to the ECM. The ECM sends an output signal to a solenoid on the electro-hydraulic pilot valve manifold. The solenoid valve opens and sends pilot oil to the left end of the lift spool. The spool shifts to the right and directs oil from the large pump section to the rod end of the lift cylinders, causing the blade to RAISE. Forward movement of the blade control handle sends pressure oil to the head end of the lift cylinders, causing the blade to LOWER.
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STMG 714 3/00 ¥ FLOAT operation
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To operate the dozer in FLOAT, the operator must "arm" the blade control handle by pressing the float button on the Vital Information Display System (VIDS) keypad. When the button is pressed, a light located below the keypad illuminates, indicating the FLOAT Mode is armed. The blade control handle must be moved to the maximum forward position to activate FLOAT, then released to the HOLD position. The blade will then operate in the FLOAT Mode. If no active faults are present, the message center will display "FLOAT" when the FLOAT Mode is active. Moving the control lever to the RAISE position or pressing the float Hot Key on the keypad will deactivate the FLOAT Mode. NOTE: Any ripper activation will temporarily suspend FLOAT operation since both circuits are supplied by the same hydraulic pump.
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DOZER CONTROL VALVE SECTION A-A
TILT RELIEF VALVE
TO ROD END TILT CYLINDER
TILT SPOOL
HOLD
TO HEAD END TILT CYLINDER FROM TILT SECTION PUMP FROM PILOT MANIFOLD FROM LIFT SECTION PUMP
LIFT RELIEF VALVE
FROM PILOT MANIFOLD
FROM PILOT MANIFOLD
SHUTTLE VALVE FROM PRESSURE COMPENSATION OVERRIDE SIGNAL PORT
12 ¥ HOLD position
The dozer lift spool is a "closed-center" spool, and the blade tilt spool is an "open-center" spool. In this view, both spools are in the HOLD (or center) position. Oil from the lift pump section enters the valve and fills the chamber in the center of the valve body. Flow from the tilt section of the pump enters the valve body, flows around the open-center tilt spool, and joins with the oil from the lift section in the center chamber. All the oil around the closed-center lift spool is blocked. Because both spools are in the HOLD position, no oil flows to or from the lift and tilt cylinders, and the load check valves do not open. .
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STMG 714 3/00 ¥ Dump valve
¥ Shuttle valve
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The spring for the dump valve plus the pressure of the oil in the tank have a combined force that provides a restriction to flow. When the pressure in the center chamber increases above the spring force plus the tank oil pressure, the dump valve will open and permit the combined flow from the two sections of the pump to return to the tank. With both spools in the HOLD position, the dump valve provides a constant low system pressure which is available for instant implement response or for "feathering" action of the controls when activated by the operator. The shuttle valve resolves which hydraulic function (dozer raise and lower or ripper) will provide pressure feedback to the spring chamber of the dump valve. The shuttle valve is spring biased to the dozer lift and lower function. The stem shifts to the right when the pressure compensation override solenoid valve is ENERGIZED. This condition occurs when the ripper function is requested by the operator or during an engine overspeed condition. When the pressure compensation override solenoid valve is DE-ENERGIZED, the spring chamber of the dump valve is connected to the tank. Tank pressure is transmitted through passages in the lift and lower spool that travel through the ball resolver valve and the shuttle valve before filling the spring chamber of the dump valve. During blade lift and lower functions, the cylinder load pressure signal is transmitted to the ball resolver valve, through the shuttle valve, to the spring chamber of the dump valve. The cylinder load pressure signal is from the lift cylinder rod end during LIFT and from the cylinder head end during LOWER or FLOAT. The ball resolver valve directs the higher of the cylinder rod or head end pressure to the shuttle valve. When the shuttle valve spool is moved completely to the left, pressure oil from the center chamber cannot fill the spring chamber of the dump valve. For this reason, only the dump valve springs plus the tank oil pressure are limiting the pressure in the center chamber. This pressure will remain low during the time when the lift and tilt spools are in the HOLD position, and the ripper circuits are not activated.
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DOZER CONTROL VALVE RAISE TO ROD END TILT CYLINDER
TO HEAD END TILT CYLINDER FROM TILT SECTIONPUMP
FROM LIFT SECTION PUMP ROD END LIFT CYLINDER HEAD END LIFT CYLINDER
FROM PILOT MANIFOLD
FROM PRESSURE COMPENSATION OVERRIDE SIGNAL PORT
13 ¥ Dozer RAISE
This view of the dozer control valve shows spool movement and oil flow when the control lever is moved to the RAISE position. Movement of the dozer lift spool to the RAISE position opens the chamber at the left center of the spool, which is connected to the rod end of the lift cylinders. Since the oil around the lift spool is no longer blocked, pressure oil from the center chamber of the valve body can open the load check valve and flow around the lift spool to the rod end of the lift cylinders. At the same time that pressure oil is sent to the lift cylinders, oil also flows to the ball resolver valve. The ball resolver valve operates similarly to a check valve. With the lift spool in the RAISE position, the ball resolver valve permits pressure oil to flow to the shuttle valve, but blocks flow to the head end and tank at the right end of the ball resolver valve.
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¥ Dump valve converted to pilot operated relief valve
During blade RAISE, the lift cylinder rod end pressure is transmitted to the spring chamber of the dump valve through the ball resolver and the shuttle valve. The dump valve uses the rod end cylinder pressure combined with the spring to move the dump valve to the right until the supply pressure is 700 kPa (100 psi) above the cylinder pressure. If the pressure in the dump valve spring chamber reaches 24135 kPa (3500 psi) for the Carrydozer or 22750 kPa (3300 psi) for the D11R Tractor due to cylinder load, the relief valve will open and allow the spring chamber oil to drain to the tank. When oil is allowed to drain from the dump valve spring chamber, the dump valve moves to the left and allows pump flow to pass around the dump valve to the tank. This operation prevents the system pressure from exceeding 24135 kPa (3500 psi) for the Carrydozer or 22750 kPa (3300 psi) for the D11R Tractor during blade RAISE or LOWER.
¥ Blade "feathering"
An additional condition can exist during dozer operation which is referred to as "feathering the blade." If the operator moves the control handle a small distance to gradually raise the blade, flow to the cylinders goes through the throttling slots in the lift spool. Flow through the throttling slots can create the same effect as an orifice by restricting the flow of oil to the lift cylinders. This restriction to flow causes a pressure difference between the oil in the center chamber of the valve body (system pressure) and the oil transmitted to the spring chamber of the dump valve (cylinder pressure). If the pressure difference is greater than the spring force, the dump valve will open and permit some of the pump flow to return to the tank at the same time that oil flows to the lift cylinders.
¥ Load check valve prevents drift
The load check valve is used to prevent reverse oil flow from the cylinders which can cause "cylinder drift."
¥ FLOAT position
When the lift spool is in the FLOAT position, the load check valve is open. The supply oil in the center chamber goes through the open load check valve to the head end of the lift cylinders. The center chamber is also open to the tank. The weight of the blade is the force that moves the dozer down. The oil from the rod end of the lift cylinders is also open to the tank when the lift spool is in the FLOAT position. When an outside force moves the blade up, the pressure of the oil in the rod end of the lift cylinders decreases as the rods retract. The pressure of the oil in the rod end circuit is less than the pressure in the head end circuit. The higher pressure in the head end circuit opens a makeup valve to fill the rod end circuit as needed.
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DOZER LIFT SPOOL HOLD
DUMP VALVE LIFT RELIEF VALVE
FROM LIFT SECTION PUMP LIFT SPOOL
FROM PRESSURE COMPENSATION OVERRIDE SIGNAL PORT
14 ¥ Dump valve has four functions: 1. Release pump flow with levers in HOLD 2. Pressure compensation valve for pump
The dump valve in the dozer control valve has four different functions in the dozer lift and ripper circuits. When the blade lift and ripper control spools are in the HOLD position, the pressure in the spring chamber of the dump valve is the same as tank pressure plus 700 kPa (100 psi), which is the value of the spring. During blade RAISE or LOWER, the pressure in the spring chamber of the dump valve is the same as the pressure in either the head end or rod end of the lift cylinders. This pressure is felt through the ball resolver valve and the shuttle valve. With the cylinder pressure plus the spring force behind the dump valve, the supply pressure will be raised to a level of 700 kPa (100 psi) above the cylinder pressure. Flow control and fine modulation are possible because of the constant 700 kPa (100 psi) pressure behind the dump valve.
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3. Flow control
When the ripper control spools are activated, pilot oil (from the pressure compensation override solenoid valve controlled by the implement ECM) is sent to the left end of the shuttle valve and moves the shuttle valve to the right. When the shuttle valve is moved, supply oil fills the spring chamber behind the dump valve. The relief valve and the dump valve now function as the pressure limiter for the ripper circuit. Because oil from the tilt pump section goes to both a passage in the dozer control valve and to the ripper control valve, the pressure of the oil is always the same in both places.
4. Relief valve for main system operation
When the lift spool is in the RAISE or LOWER position, cylinder pressure is transmitted to the spring chamber of the dump valve through the ball resolver valve and the shuttle valve. A pressure relief valve is located in the dump valve spring chamber. This valve will lift off its seat and allow the spring chamber oil to drain when the pressure in the spring chamber reaches 24135 kPa (3500 psi) for the Carrydozer and 22750 kPa (3300 psi) for the D11R Tractor. When the relief valve opens, an imbalance exists between the pressure in the center chamber and a combination of the dump valve spring and the pressure in the spring chamber. A balance is achieved when the dump valve shifts to the left allowing oil in the center chamber to drain until the pressure in the center chamber is equal to the dump valve spring plus the spring chamber pressure. This method of controlling maximum system pressure is called a "pilot operated relief valve."
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D11R QUICK-DROP VALVE RAISE ROD END OIL
HEAD END OIL
15 Quick-drop Valves (D11R) ¥ Quick-drop valve in RAISE position
All flow to and from the blade lift cylinders must go through the quickdrop valves that are installed on top of each cylinder. The primary function of the quick-drop valve is to allow rapid blade lower without voiding the head end of the lift cylinders. Minimizing the amount of cylinder voiding reduces the time delay that can occur when a rapid blade lower is followed by an operator request for blade down pressure. The quick-drop valve is activated when a sufficient pressure difference occurs between the cylinder rod end oil and the oil in the spring cavity. This pressure difference is caused by rod end oil flow through an orifice in the quick-drop valve. The quick-drop valve is de-activated by high pressure in the head end felt through a slot in the spool. The quick-drop valves help control four functions of the bulldozer: RAISE, LOWER at slow speeds, rapid LOWER, and LOWER with down pressure.
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When the blade control handle is moved to the RAISE position, supply oil enters the quick-drop valve through an inlet passage and an orifice, flows through a sleeve, and is directed to the rod end of the lift cylinder. A small amount of oil passes through another orifice and fills the spring chamber behind the plunger. The pressure of this oil adds to the force of the spring, which pushes the valve against the sleeve. This condition causes all the oil entering the quick-drop valve to be directed to the rod end of the lift cylinders and all the oil from the head end of the lift cylinders to return to the tank.
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D11R QUICK-DROP VALVE LOWER ROD END OIL
HEAD END OIL
16 ¥ Quick-drop valve in LOWER
When the blade control handle is at less than approximately 75% of full lever travel, the lowering of the blade is controlled or modulated. The flow of oil that can pass through the control valve lift spool at any given position is a function of the pressure difference across the spool and the temperature of the oil. As stated earlier, the quick-drop valve is activated by high lift cylinder rod end oil flow in combination with low lift cylinder head end pressure. For this reason, the actual control handle position when the quick-drop valve is actuated can vary based on oil temperature and the blade weight, which determine the rod end oil pressure.
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When the blade control handle is moved to the LOWER position, supply oil enters the quick-drop valve through a port and flows to the head end of the lift cylinders. The oil being pushed from the rod end of the cylinders returns through the control valve to the tank. Because of the weight of the blade and the resistance to flow, the pressure of the rod end oil may be higher than the head end oil. The flow of oil through the orifice is not high enough to create a large pressure difference between the oil in the port and the oil behind the plunger. The spring holds the valve against the sleeve and all the oil leaving the rod end of the lift cylinder returns through the control valve to the hydraulic tank.
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D11R QUICK-DROP VALVE QUICK-DROP ROD END OIL
HEAD END OIL
17 ¥ Quick-drop LOWER
When the blade control handle exceeds approximately 75% of lever travel and the cylinder head end pressure is low, the quick-drop valve is activated and the blade drops very rapidly. The oil flow for a quick-drop is the same as slow lower except that some of the oil leaving the rod end of the lift cylinder is directed into the head end of the cylinder. When the flow of oil through the orifice creates enough pressure differential between the port and the plunger spring chamber, the valve and plunger shift to the left and permit oil leaving the rod end to be added to the supply oil filling the head end of the lift cylinders. As stated earlier, during a rapid blade drop, the rod end pressure will be higher than the head end pressure due to the blade weight. The resulting pressure differential and valve movement allow the rod end oil to flow to the head end of the cylinder and minimize cylinder voiding.
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D11R QUICK-DROP VALVE LOWER WITH DOWN PRESSURE ROD END OIL
HEAD END OIL
18 ¥ LOWER with down pressure
When down pressure must be applied to the blade, the operator moves the blade control handle to the LOWER position. Pressure oil from the dozer control valve is sent to the head end of the lift cylinders. At the same time, oil fills the chamber at the left end of valve spool. As the head end pressure and resistance to downward movement increase, pressure in the chamber at the left end of the valve spool moves the plunger to the left against the force of the spring and moves the valve spool completely to the right. All the pressure oil from the dozer control valve is then sent to the head end of the lift cylinders. All the rod end oil is returned through the dozer control valve to the tank.
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LOAD CHECK VALVE
DOZER TILT SPOOL HOLD SECTION A-A
A
A
TILT RIGHT
TILT LEFT FROM PUMP TILT SECTION FROM PILOT MANIFOLD FROM PUMP LIFT SECTION
19 Bulldozer Tilt Circuit ¥ Tilt spool in HOLD
The tilt spool has three positions: TILT RIGHT, HOLD, and TILT LEFT. The tilt spool is hydraulically operated by pilot pressure from a pilot valve group which is controlled by the ECM. In the HOLD position, the oil from the tilt pump section goes around the tilt spool and joins the oil from the lift pump section. The oil then opens the dump valve and returns to the tank.
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LOAD CHECK VALVE
DOZER TILT SPOOL TILT RIGHT SECTION A-A
TILT RIGHT A
TILT LEFT
A
FROM PUMP TILT SECTION
FROM PUMP LIFT SECTION
FROM ELECTRO-HYDRAULIC PILOT VALVE MANIFOLD
20 ¥ Pilot oil moves tilt spool to right
Movement of the blade control handle to the right sends an electrical signal to the ECM. The ECM then sends an output signal to a proportional solenoid on the electro-hydraulic pilot valve manifold. As the solenoid valve opens, pilot oil flows to the left end of the tilt spool. The pilot oil pressure moves the spool to the TILT RIGHT position.
¥ Load check valve opens
In the TILT RIGHT position, the oil from the tilt section of the pump cannot combine with the oil from the lift section, and the pressure of the oil increases. The increased pressure opens the load check valve. Before the start of flow to the left tilt cylinder, oil passes through a small hole in the tilt relief valve and fills the large spring chamber between the relief spool and the poppet. This condition raises the pressure setting of the tilt relief valve. As the tilt spool moves farther, the pump flow is sent to the left tilt cylinder, and the supply pressure increases due to the load.
¥ Oil to tilt cylinder retracts rod
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The D11R CD is equipped only with dual tilt. In the TILT RIGHT position, pump oil is sent to the head end of the left tilt cylinder, which pushes oil to the rod end of the right tilt cylinder. Handle movement to the left sends pilot pressure oil to the right end of the spool. The spool moves to the left, sending tilt pump oil to the right tilt cylinder, and the blade tilts left. When the blade control handle is released from either the TILT RIGHT or TILT LEFT position, springs return the tilt spool to the HOLD position. When the blade control handle is released, the pilot oil at the left end of the tilt spool is drained. The spring at the right end of the tilt spool moves the spool to the HOLD position. In the HOLD position, the oil in the head and rod ends of the tilt cylinders is blocked. The tilt angle of the blade will not change until the blade control handle is moved. To summarize, with the tilt spool in the TILT RIGHT position, flow from the tilt section of the pump does not combine with flow from the lift section. Pilot oil at the left end of the tilt spool moves the spool to the right. Flow from the tilt section of the pump goes around the tilt spool and is sent to the head end of the left tilt cylinder. ¥ Tilt circuit relief valve
Because the tilt section flow cannot combine with the oil in the center chamber, the dump valve for the dozer lift circuit does not control the tilt circuit pressure. Instead, the tilt relief valve (at the top of the valve body) is used to limit the pressure in the tilt circuit. When the tilt cylinder pressure increases to 24825 kPa (3600 psi) for the Carrydozer or 24300 kPa (3500 psi) for the D11R, the pilot valve for tilt relief will open and drain the spring chamber behind the valve spool. This condition permits the valve spool to open and limit the pressure in the tilt circuit.
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D11R DUAL TILT VALVE HOLD
TO ROD END
FROM ELECTROHYDRAULIC MANIFOLD S2
S1
TO HEAD END
TILT CYLINDERS
FROM BLADE TILT VALVE
21 Dual Tilt Valve (D11R) ¥ Dual tilt valve has three modes: - Dual tilt - Single tilt
The dual tilt valve (standard on the D11R) provides the blade tilt circuit with three different modes of operation: DUAL TILT, SINGLE TILT, and BLADE PITCH. The control valve is located between the radiator grill doors and the radiator on the left side of the machine. The valve is activated by pilot oil pressure from a line connected to a T-fitting at the accumulator. The dual tilt valve contains a spring centered, hydraulically actuated spool valve and an electrically energized solenoid valve. The solenoid valve contains two coils and has three different positions. When neither solenoid coil is energized, the system operates in the DUAL TILT Mode. When the SNGL TILT key is pressed on the VIDS keypad, the S2 coil in the solenoid valve is energized, and the system operates in the SINGLE TILT Mode. When the trigger switch on the blade control handle is depressed, the system energizes the S1 coil in the solenoid and activates the BLADE PITCH Mode.
The S1 solenoid is also energized if the operator pitches (or racks) the blade with the thumb switch located at the top rear of the blade control handle. The appropriate solenoids are energized if the automatic functions of the dozing cycles are selected by the operator through the VIDS keypad. Both the left and right tilt cylinder pistons contain bypass valves. These valves allow the completion of the tilt operation. When one of the cylinders reaches the end of its travel, the oil goes through the bypass valve to continue filling the other cylinder. The bypass valve opens when the cylinder reaches the end of the stroke and allows oil to flow from one end of the cylinder to the other cylinder. NOTE: During a TILT function, the single tilt solenoid (S2) is ENERGIZED only when the SNGL TILT Hot Key is activated.
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D11R DUAL TILT CIRCUIT DUAL TILT RIGHT FROM TILT CONTROL VALVE
TO ROD END LEFT TILT CYLINDER RIGHT TILT CYLINDER
TO TILT CONTROL VALVE
TO HEAD END
FROM ELECTROHYDRAULIC MANIFOLD
FROM TRIGGER SWITCH FROM TOGGLE SWITCH
22 ¥ Dual tilt operation
¥ DUAL TILT RIGHT
¥ Cylinders move in opposite directions
The default position of the dual tilt valve is DUAL TILT. In the DUAL TILT mode, pilot oil flow is blocked at the solenoid valve and the dual tilt directional spool remains centered by the spring force. When the operator moves the blade control handle to the TILT RIGHT position, pump oil from the dozer control valve tilt circuit is sent to the head end of the left tilt cylinder. This condition causes oil from the rod end of the left tilt cylinder to be forced through the dual tilt control valve. The oil travels around the spool and is directed to the rod end of the right tilt cylinder. As the right tilt cylinder retracts, the oil in the head end of the cylinder is directed back through the dual tilt control valve and the dozer tilt control valve to the tank. Movement of the tilt cylinders in opposite directions causes the blade to tilt.
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This action of the dual tilt cylinders causes the blade to tilt to the right. When the control lever is released, the oil is blocked at the control valve, and the blade remains tilted to the right until the control lever is moved again. ¥ Bypass valve provides full retraction for maximum blade tilt
The bypass valve in the left tilt cylinder piston allows oil to continue flowing to the right cylinder after the rod is fully extended from the left cylinder. The bypass valve allows oil to continue to flow to the right tilt cylinder rod end and provides full retraction for maximum blade tilt.
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D11R DUAL TILT CIRCUIT SINGLE TILT RIGHT FROM TILT CONTROL VALVE
TO ROD END LEFT TILT CYLINDER RIGHT TILT CYLINDER
TO TILT CONTROL VALVE
TO HEAD END
FROM ELECTROHYDRAULIC MANIFOLD
FROM TRIGGER SWITCH FROM KEYPAD
23 ¥ Toggle switch energizes S2 coil
To change from the DUAL TILT to the SINGLE TILT Mode, the SNGL TILT key on the VIDS keypad is pressed. The SNGL TILT function is selected and the S2 coil in the solenoid valve is energized. The valve allows pilot oil from the solenoid valve to flow to the upper end of the directional spool and opens the lower end of the spool to drain. The directional spool moves down against the spring force to the SINGLE TILT position. In this condition, only the left tilt cylinder will extend or retract to change the position of the blade.
¥ SINGLE TILT RIGHT
When the operator moves the blade control handle to the SINGLE TILT RIGHT position, supply oil is sent to the head end of the left tilt cylinder. The rod extends forcing oil from the rod end to the tank. In the SINGLE TILT mode, the directional spool blocks oil to and from the right tilt cylinder to keep it stationary. The right tilt cylinder then functions as a brace. When the control handle is released, the oil is blocked at the control valve, and the blade remains tilted to the right until the control handle is moved again.
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D11R DUAL TILT CIRCUIT BLADE PITCH FORWARD
FROM TILT CONTROL VALVE
TO ROD END LEFT TILT CYLINDER RIGHT TILT CYLINDER
TO HEAD END
TO TILT CONTROL VALVE FROM ELECTROHYDRAULIC MANIFOLD
FROM TRIGGER SWITCH FROM KEYPAD
24 ¥ Trigger switch energizes S1 coil
To change the blade pitch, the trigger switch on the blade control handle is depressed, the thumb switch is pushed to the right, or the left mode button is pressed for the Auto Blade Assist (ABA) feature. To PITCH the blade, the S1 coil in the solenoid valve is energized. The solenoid valve directs pilot oil to the lower end of the directional spool and opens the upper end of the spool to drain. The valve spool then shifts up against the spring force to the BLADE PITCH Mode.
¥ BLADE PITCH FORWARD
For BLADE PITCH FORWARD, flow from the dozer tilt circuit is sent to the head end of the left tilt cylinder. As the cylinder extends, oil from the rod end is pushed through the dual tilt valve to the head end of the right tilt cylinder. The oil in the rod end of the right tilt cylinder is pushed back through the dual tilt valve to the hydraulic tank. As both tilt cylinders extend, the blade pitches forward. The cylinder extension rate is not the same between the left and right tilt cylinders. This difference is caused by the unequal volume of oil entering the two cylinder head ends. The volume of oil being pushed from the left cylinder rod end is used to extend the right tilt cylinder.
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The left rod end displaces a volume equivalent to the volume entering the left head end of the cylinder minus the cylinder rod volume. Since the right tilt cylinder head end receives oil from the rod end of the left cylinder, the right cylinder will extend at a slower rate than the left cylinder. When the blade control handle is released, the oil is blocked at the control valve and the blade remains pitched forward until the control lever is moved again. ¥ BLADE PITCH has priority
One additional characteristic of the BLADE PITCH mode is that it has priority over the SNGL TILT mode.
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DUAL TILT SOLENOID VALVE TO ROD END
HOLD FROM ELECTRO-HYDRAULIC PILOT MANIFOLD
TO HEAD END
S1
PITCH REGENERATE VALVE
TILT CYLINDERS
FROM FAN PUMP
FROM BLADE TILT VALVE
25 Dual Tilt Valve (Carrydozer) ¥ Dual tilt valve has two modes: - TILT LEFT or RIGHT - DUMP or RACK BACK ¥ Solenoid valve has two positions
The dual tilt solenoid valve provides the blade tilt circuit with two different modes of operation: DUAL TILT (LEFT or RIGHT) and PITCH (FORWARD or BACK). The control valve is located between the radiator grill doors and the radiator on the left side of the machine. The valve is activated by pilot oil pressure supplied by the fan circuit through a line connected to a T-fitting at the accumulator. The dual tilt valve contains a spring centered, hydraulically actuated spool valve and an electrically energized solenoid valve. Although both solenoid coils are installed, only one coil (S1) is used in the carrydozer application. When the S1 coil is DE-ENERGIZED, the system operates in the DUAL TILT Mode. When the trigger switch on the blade control handle is depressed, or the thumb switch is moved to the right, the system energizes the S1 coil in the solenoid and activates the BLADE PITCH Mode. When the thumb switch on the blade control handle is moved to the left, the S1 coil in the solenoid valve is
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The solenoid on the pitch regenerate valve is also ENERGIZED when the BLADE PITCH Mode is selected. In the PITCH FORWARD Mode, rod end oil from the right tilt cylinder combines with head end oil at the pitch regenerate valve to allow the tilt cylinders to dump faster. The cylinders dump evenly because the left rod end area is equal to the right head end area. ¥ Tilt cylinders contain bypass valves
Both the left and right tilt cylinder pistons contain bypass valves. These valves allow the completion of the tilt operation. When one of the cylinders reaches the end of its travel, the oil flows through the bypass valve to continue filling the other cylinder.
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DUAL TILT CIRCUIT TILT RIGHT
PITCH REGENERATE VALVE
TO ROD END LEFT TILT CYLINDER RIGHT TILT CYLINDER
TO HEAD END
FROM ELECTROHYDRAULIC MANIFOLD
TO/FROM DOZER TILT VALVE
FROM TRIGGER SWITCH
26 ¥ Dual tilt operation
¥ TILT RIGHT
¥ Cylinders move in opposite directions
The DUAL TILT feature is standard equipment on the Carrydozer. In the DUAL TILT Mode, oil flow is blocked at the solenoid valve and the dual tilt directional spool remains centered by the spring force. Movement of the tilt cylinders in opposite directions causes the blade to tilt. When the operator moves the blade control handle to the TILT RIGHT position, supply oil from the dozer control valve tilt circuit is sent to the head end of the left tilt cylinder. This condition causes oil from the rod end of the left tilt cylinder to be forced through the dual tilt control valve. The oil travels around the spool and is directed to the rod end of the right tilt cylinder. As the right tilt cylinder retracts, the oil in the head end of the cylinder is directed back through the dual tilt control valve and the dozer tilt control valve to the tank. This action of the tilt cylinders causes the blade to tilt to the right. When the control handle is released, the oil is blocked at the control valve, and the blade remains tilted to the right until the control handle is moved again.
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¥ Bypass valve provides full retraction for maximum blade tilt
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The bypass valve in the left tilt cylinder piston allows oil to continue flowing to the right cylinder after the rod is fully extended from the left cylinder. The bypass valve allows oil to continue to flow to the right tilt cylinder rod end and provides full retraction for maximum blade tilt. Maximum blade tilting is limited on the Carrydozer by the lift cylinder position sensors. Limiting the tilt function prevents the blade push arms from interfering with the tracks. The long stroke of the tilt cylinders on the Carrydozer makes limiting the blade tilt function necessary.
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DUAL TILT CIRCUIT PITCH FORWARD
PITCH REGENERATE VALVE
TO ROD END LEFT TILT CYLINDER RIGHT TILT CYLINDER
TO HEAD END
FROM ELECTROHYDRAULIC MANIFOLD
TO/FROM DOZER TILT VALVE
FROM TRIGGER SWITCH
27 ¥ Trigger switch energizes S1 coil
To pitch the blade FORWARD, the trigger switch on the blade control handle is depressed, or the thumb lever is pushed to the right, and the S1 coil in the solenoid valve is ENERGIZED. The solenoid valve directs pilot oil to the lower end of the directional spool and opens the upper end of the spool to drain. The valve spool then shifts up against the spring force to PITCH FORWARD.
¥ Blade PITCH FORWARD
For PITCH FORWARD, flow from the dozer tilt circuit is sent to the head end of the left tilt cylinder. As the cylinder extends, oil from the rod end is pushed through the dual tilt valve to the head end of the right tilt cylinder. The oil in the rod end of the right tilt cylinder is pushed back through the dual tilt valve. When the trigger switch is depressed for PITCH FORWARD, the pitch regenerate valve located below the dual tilt valve is also activated. The pitch regenerate valve provides regenerative flow to prevent cylinder voiding and allows the right cylinder rod end oil to be directed to the head end of the cylinders. This condition allows both cylinders to extend at the same rate. As both tilt cylinders extend, the blade pitches forward.
¥ Pitch regenerate valve
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As stated earlier, both cylinders extend at the same rate because the rod end area of the left tilt cylinder is equal to the head end area of the right tilt cylinder. ¥ Thumb lever left allows PITCH BACK
When the trigger switch is released, the oil is blocked at the control valve and the blade remains pitched forward until the thumb lever is moved to the left or PITCH BACK Mode.
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28
Ripper and Pilot Circuits ¥ Ripper control valve
The ripper control valve has two spools (lift and tip), two makeup valves (one for the head end of the ripper lift cylinders and one for the rod end of the ripper tip cylinders), and a load check valve. The ripper lift spool is operated with pilot oil pressure and has three positions: RAISE, HOLD, and LOWER. The ripper tip spool is operated by pilot oil pressure and also has three positions: SHANK IN, HOLD, and SHANK OUT. Movement of the thumb lever on the ripper control handle causes the ripper to RAISE or LOWER. Moving the finger lever on the ripper control lever selects SHANK IN or SHANK OUT. The button on the ripper control handle activates the Auto Stow feature.
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RIPPER IN
RIPPER LOWER
TILT BLADE RIGHT/ RAISE DUMP
IMPLEMENT LOCKOUT SOLENOID VALVE
RIPPER AND PILOT SYSTEMS RAISE
FAN PUMPS
IMPLEMENT PUMP
RIPPER RIPPER TILT RAISE LEFT/ OUT RACK
BLADE LOWER/ FLOAT
TO PRESSURE COMPENSATION OVERRIDE SOLENOID VALVE
TO DOZER CONTROL VALVE
MAKEUP VALVE LOAD CHECK VALVE
LIFT CYLINDERS
RIPPER IN/OUT SPOOL RIPPER LIFT SPOOL
29 ¥ RIPPER RAISE
When the operator requests the RIPPER RAISE function, an electrical signal from the ripper thumb switch is sent to the ECM. The ECM sends an output signal to the ripper raise solenoid on the pilot manifold. The solenoid valve opens, sending pilot oil to the upper end of the ripper lift spool. At a synchronized time, the ECM sends a signal to energize the pressure compensated override solenoid valve. The pressure compensated override solenoid valve directs pilot oil to the shuttle valve in the dozer control valve. The shuttle valve shifts to the right and allows oil from the center chamber to fill the spring chamber of the dump valve, which now functions as the relief valve for the ripper circuit. When the shuttle valve is shifted, the oil from the implement pump is directed to the load check valve in the ripper control valve. The increased pressure opens the load check valve and allows oil to flow to the rod end of the ripper lift cylinders to RAISE the ripper.
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The ripper functions are electronically prioritized so ripper LIFT has priority over ripper SHANK IN/OUT if they are requested simultaneously. All ripper functions have priority over blade FLOAT.
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RIPPER IN
RIPPER LOWER
TILT BLADE RIGHT/ RAISE DUMP
IMPLEMENT LOCKOUT SOLENOID VALVE
RIPPER AND PILOT SYSTEMS LOWER
FAN PUMPS
IMPLEMENT PUMP RIPPER RIPPER TILT OUT RAISE LEFT/ RACK
BLADE LOWER/ FLOAT TO DOZER CONTROL VALVE
MAKEUP VALVE
LIFT CYLINDERS
LOAD CHECK VALVE
RIPPER IN/OUT SPOOL
RIPPER LIFT SPOOL
TO PRESSURE COMPENSATION OVERRIDE SOLENOID VALVE
30 ¥ RIPPER LOWER
When the operator requests the RIPPER LOWER function, an electrical signal from the ripper thumb switch is sent to the ECM. The ECM sends an output signal to the ripper lower solenoid on the pilot manifold. The solenoid valve opens, sending pilot oil to the lower end of the ripper lift spool. At a synchronized time, the ECM sends a signal to energize the pressure compensated override solenoid valve. The pressure compensated override solenoid valve directs pilot oil to the shuttle valve in the dozer control valve. The shuttle valve shifts to the right and allows oil to fill the spring chamber of the dump valve, which now functions as the relief valve for the ripper circuit. When the shuttle valve is shifted, the oil from the implement pump is directed to the load check valve in the ripper control valve. The increased pressure opens the load check valve and allows oil to flow to the head end of the ripper lift cylinders to LOWER the ripper. If, due to the ripper weight, the ripper drops faster than the pump can provide flow to the cylinder, the makeup valve opens and allows drain oil to fill the head end of the cylinders to prevent cylinder voiding.
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RIPPER RIPPER OUT LOWER
TILT BLADE RIGHT/ RAISE DUMP
IMPLEMENT LOCKOUT SOLENOID VALVE
RIPPER AND PILOT SYSTEMS SHANK IN
FAN PUMPS TO PRESURE COMPENSATION SOLENOID VALVE
IMPLEMENT PUMP RIPPER RIPPER TILT IN RAISE LEFT/ RACK
BLADE LOWER/ FLOAT TO DOZER CONTROL VALVE
MAKEUP VALVE
LIFT CYLINDERS
LOAD CHECK VALVE
RIPPER IN/OUT SPOOL
RIPPER LIFT SPOOL
31 ¥ SHANK IN
When the operator requests the ripper SHANK IN function, an electrical signal from the ripper finger lever is sent to the ECM. The ECM sends an output signal to the ripper in solenoid on the pilot manifold. The solenoid valve opens, sending pilot oil to the lower end of the ripper tip spool. At a synchronized time, the ECM sends a signal to energize the pressure compensated override solenoid valve. The pressure compensated override solenoid valve directs pilot oil to the shuttle valve in the dozer control valve. The shuttle valve shifts to the right and allows oil to fill the spring chamber of the dump valve, which now functions as the relief valve for the ripper circuit. When the shuttle valve is shifted, the oil from the implement pump is directed to the load check valve in the ripper control valve. The increased pressure opens the load check valve and allows oil to flow to the head end of the ripper tip cylinders to allow the ripper tip to move toward the machine.
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RIPPER RIPPER OUT LOWER
TILT BLADE RIGHT/ RAISE DUMP
IMPLEMENT LOCKOUT SOLENOID VALVE
RIPPER AND PILOT SYSTEMS SHANK OUT
FAN PUMPS TO PRESURE COMPENSATION OVERRIDE SOLENOID VALVE
IMPLEMENT PUMP RIPPER RIPPER TILT IN RAISE LEFT/ RACK
BLADE LOWER/ FLOAT TO DOZER CONTROL VALVE
MAKEUP VALVE
LIFT CYLINDERS
LOAD CHECK VALVE
RIPPER IN/OUT SPOOL
RIPPER LIFT SPOOL
32 ¥ Shank out
When the operator requests the ripper SHANK OUT function, an electrical signal from the ripper finger lever is sent to the ECM. The ECM sends an output signal to the ripper tip solenoid on the pilot manifold. The solenoid valve opens, sending pilot oil to the upper end of the ripper tip spool. At a synchronized time, the ECM sends a signal to energize the pressure compensated override solenoid valve. The pressure compensated override solenoid valve directs pilot oil to the shuttle valve in the dozer control valve. The shuttle valve shifts to the right and allows oil to fill the spring chamber of the dump valve, which now functions as the relief valve for the ripper circuit. When the shuttle valve is shifted, the oil from the implement pump is directed to the load check valve in the ripper control valve. The increased pressure opens the load check valve and allows oil to flow to the head end of the ripper lift cylinders to LOWER the ripper. If, due to machine movement, the ripper tip extends faster than the pump can provide flow to the cylinders, the makeup valve opens and allows drain oil to fill the rod end of the cylinders to prevent cylinder voiding.
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VITAL INFORMATION DISPLAY SYSTEM
BATTERY POWER TRAIN FILTER BYPASS SWITCH
SPI
POWER TRAIN OIL TEMERATURE SENSOR
SPI
SPEEDOMETER/TACOMETER
QUAD GAUGE
HYDRAULIC OIL TEMERATURE SENSOR
ELECTO-HYDRAULIC FILTER BYPASS SWITCH
CAT DATA LINK
VIDS (ECM)
FRONT ACTION LAMP
ACTION ALARM
FAN RETURN FILTER BYPASS SWITCH
REAR ACTION LAMP KEY START SWITCH
SPI
MESSAGE CENTER
KEYPAD INPUT 8V SENSOR SUPPLY FUEL LEVEL SENSOR
12V INSTRUMENT SUPPLY
33 VITAL INFORMATION DISPLAY SYSTEM (VIDS) ¥ Vital Information Display System
The Vital Information Display System (VIDS) continuously monitors the machine systems. VIDS contains both software and hardware components. The hardware components consist of the VIDS ECM, a keypad, quad gauge, speedometer/tachometer, message center, and various switches, sensors, lamps and alarms. The VIDS components communicate with each other, with other electronic controls on the machine, and with systems off the machine through Data Links. VIDS uses the following Data Links: CAT Data Link: This two wire Data Link allows communication between the VIDS ECM and any other machine control system. Serial Peripheral Interface (SPI) Data Link: This four wire Data Link allows communication between the VIDS ECM and all display components.
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INSTRUCTOR NOTE: At this time, it is recommended that each student be provided with a copy of the booklet "VIDS Message Center and Keypad Operator Instruction" (Form TEJB6017). The use of this booklet with the visuals that follow will enhance the ability of the students to perform the various keypad functions.
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VITAL INFORMATION DISPLAY SYSTEM (VIDS) OPERATOR KEYPAD
2
1
3
OK
SNGL TILT
5
4 MENU
GAUGE
SETUP
SET PITCH
7 AUT
X
?
i+
CANCEL
HELP
MORE
ABA
6 SET MACH
9 FLOAT
34 Keypad Operation ¥ Key functions
The keypad, located to the right of the operatorÕs compartment above the blade control handle, allows the operator or service technician to communicate with the VIDS monitor module. The operator or service technician can select the information shown on the display and initiate service procedures. The keypad also allows the operator to enter an identification number to recall stored parameters and to acknowledge events. The key pressed indicator, located above the OK key, flashes once each time a key is pressed. This flash notifies the operator or the service technician that the keystroke was accepted. The keypad will not accept an entry when an active event is present and flashing on the message center. To proceed, the operator or service technician must acknowledge the event by pressing the OK key.
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When a series of related keystrokes (operator ID or menu operations) is entered, consecutive keystrokes must be less than five seconds apart. Periods longer than five seconds will cancel the previous keystroke. The left side of the keypad allows the operator or service technician to communicate with the VIDS monitor, while the right side of the keypad allows the operator to "setup," "arm" or "disarm" the features of the machine. The functions of the left keys are: ¥ Key pressed indicator ¥ OK ¥ Menu
Key Pressed Indicator: flashes once when any key is pressed. OK: used to complete keypad entries and to acknowledge events. MENU: used to access the main menu. The menu is comprised of the following choices: 1:PREFERENCE MENU 1:ADJUST CONTRAST 2:ADJUST BACKLIGHT 3:SELECT UNITS 4:SELECT LANGUAGE 2:EVENTS MENU 1:ACTIVE EVENTS 2:SUMMARY LOG 3:SYSTEM MENU 1:MACHINE STATS 2:TEST DISPLAY 3:AUTOLUBE MENU
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¥ Service options
¥ Tests
¥ Calibrations
¥ Cancel ¥ Help ¥ More ¥ Arrow Keys
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4:SERVICE OPTIONS 1:INIT MANUAL LUBE 2:PERFORM CALIBRATIONS LIMP HOME MODE (allows implement movement through the keypad) MAIN PMP RELIEF TEST (determines and displays main pump relief pressure) TILT PMP RELIEF TEST (CD only) (determines and displays tilt pump relief pressure) *BLADE CONTROL HANDLE (calibrates blade control handle) *RIPPER CONTROL HANDLE (calibrates ripper control handle) *FNR SHFTER SENSOR (calibrates FNR shifter) *LEFT BRAKE TOUCH UP (performs left brake touch up) *RIGHT BRAKE TOUCH UP (performs right brake touch up) *LEFT CLUTCH HIGH PRE (calibrates left clutch high pressure) *RIGHT CLTCH HIGH PRE (calibrates right clutch high pressure) *LEFT BRAKE LOW PRESS (calibrates left brake low pressure) *RIGHT BRAKE LOW PRES (calibrates right brake low pressure) *LEFT CLUTCH LOW PRES (calibrates left clutch low pressure) *RIGHT CLUTCH LOW PRE (calibrates right clutch low pressure) * Service Mode Protected CANCEL: used to reject a prompt choice or setting value. HELP: provides "help" messages pertaining to the use of the menu selected. MORE: displays next line of text on message center. Backward Arrow Key Forward Arrow Key
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GAUGE: shows parameter name and number for first gauge in available list. Line two shows parameter value and unit of measure. The Forward Arrow Key allows the operator to scroll one gauge at a time through the list. If the GAUGE key is pressed twice, the parameters will be shown by categories (Operator, Engine, Transmission, Implement, Service, and All). Pressing the GAUGE key three times will access the parameter ID input screen. The operator may enter any parameter ID, press OK and that parameter will be displayed. SETUP: enables the operator to select and save a grouping of machine settings to better meet an operator's method of operation. This mode will be discussed in detail later in the presentation.
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- ID MENU 1: SELECT OPERATOR OPERATOR - 1 OPERATOR - 20
2: SAVE ALL SETTINGS 3: RECALL OPERATOR OPERATOR - 1 OPERATOR - 20
4: OPERATOR SETUP 1:CHANGE OPER NAME 2:RESET TO FACTORY
The SETUP key enables an operator to select and save a grouping of machine performance settings to better meet the method of operation. When the SETUP key is pressed, the VIDS Message Center text area will display the menu title and the first option. The menu title will remain on the first line, and the display can be cycled by using the arrow keys. An option may be selected by using the OK key when one of the four options is being displayed or by using the associated numeric key. Pressing the CANCEL key at this point will return the display back to the Default (or Background) Mode.
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Most menus have more options than can be displayed at the same time. To help keep track of the menu, the first line of the message center displays the menu titles. The second line will initially display the first option. The additional options may be viewed by using the arrow keys. ¥ SETUP options
The options are: - ID MENU 1:SELECT OPERATOR OPERATOR - 1 OPERATOR - 20 2:SAVE ALL SETTINGS 3:RECALL OPERATOR OPERATOR - 1 OPERATOR - 20 4:OPERATOR SETUP 1:CHANGE OPER NAME 2:RESET TO FACTORY 5:SERV MODE TOGGLE 6:FACTORY DEFAULTS
This Setup Option allows the operator to choose a predefined numeric identifier, "OPERATOR - n," for the group of settings. To the control system, the operator assumes the identity of the selected "OPERATOR - n." The SELECT OPERATOR list contains 20 possible selections. When the SELECT OPERATOR menu item is selected, the VIDS Message Center text area will display the menu title and the first option. The menu title will remain on the first line, and the additional options may be viewed by using the arrow keys. An option can be selected by using the OK key when that option is being displayed, or by pressing the associated numeric key. Pressing the CANCEL key at this point will return the display to the main menu.
