D10R Implement Systems

Service Training

SESV1692 October 1997

Meeting Guide 692

TECHNICAL PRESENTA PRESENTATION TION

D11R TRACK-TYPE TRACTOR IMPLEMENT SYSTEMS

Titles you can't find anywhere else

Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.













D11R TRACK-TYPE TRACTOR IMPLEMENT IMPLEM ENT SYS SYSTEM TEMS S MEETING GUIDE 692

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 discusses the operation of the implement hydraulic system for the D11R Track-type Tractor.

OBJECTIVES After learning the information in this presentation, the serviceman will be able to: 1. 2. 3. 4.

locate and identify all major components in the implement hydraulic system; locate and identify all filters, drains, and test points; explain the function of each component in the implement hydraulic system; and trace the flow of oil through the implement hydraulic system.

REFERENCES D11R Track-type Tractor Service Manual (9TR 1-Up) D11R Track-type Tractor Service Manual (8ZR 1-Up)

SENR1775 SENR9400

PREREQUISITES Interactive Video Course "Fundamentals of Mobile Hydraulics" (CD ROM) STMG 546 "Graphic Fluid Power Symbols"

TECD9001 SESV1546

SUPPLEMENTARY TRAINING MATERIAL STMG 679 "D10R Track-type Tractor--Introduction" STMG 527 "D11N Track-type Tractor--Part Tractor--Part 2: Undercarriage, Implements, and Operator’s Station" Video Tape "D11R Track-type Tractor/D11R CD Carrydozer--Introduction"

SESV1679 SESV1527 SEVN4173

Estimated Time: Time: 2 Hours Visuals: 27 (2 X 2) Slides Serviceman Handouts: 18 Line Drawings Drawings Form: SESV1692















STMG 692 STMG 10/97

-3-

TABLE OF CONTENTS INTRODUCTION INTROD UCTION ..................................................... ............................................................................................................. .............................................................5 .....5 IMPLEMENT HYDRAULIC IMPLEMENT HYDRAULIC SYSTEM.................................................................. SYSTEM.......... ......................................................................6 ..............6 Bulldozer Tilt Circuit........................................................................................................9 Bulldozer Lift Circuit......................................................................................................12 Quick-drop Quick-dr op Valves ............................................... ........................................................ ...........................................................19 ...19 Fan Drive Hydraulic Hydraulic System..................................................................... ......................25 Ripper and Pilot Circuits.................................................................................................26 Dual Tilt Tilt Valve Valve ..................................................... ............................................................................................................. ...........................................................33 ...33 CONCLUSION.....................................................................................................................40 SLIDE LIST..........................................................................................................................41 SERVICEMA SER VICEMAN'S N'S HANDOU HANDOUTS TS................................................... ................................................... ........................................42















STMG 692 STMG 10/97

-4-

INSTRUCTOR NOTES















STMG 692 STMG 10/97

-5-

D 11 R T R A C K - T Y P E T R A C T O R IMPLEMENT SYSTEMS

© 1997 Cater Caterpilla pillarr Inc.

1

INTRODUCTION

This presentation discusses the major design features of the implement hydraulic systems for the updated D11R Track-type Tractor (Serial Number 9TR 1-Up). The D11R D11R is an elevated sprocket design tractor equipped with the Power Train Electronic Control System and Finger Tip Control steering. • 35 3508 08B B engine engine

This tractor is 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 results in maximum torque multiplication during heavy loading.















STMG 692 STMG 10/97

-6-

IMPLEMENT HYDRAULIC SYSTEM COMPONENTS

RIPPER CONTROL VALVE

FAN MOTOR AND MAKEUP VALVE

DUAL TILT CONTROL VALVE

QUICK-DROP VALVES

PILOT VALVE HYDRAULIC AND DOZER TANK CONTROL VALVE

FAN PUMPS

IMPLEMENT PUMP

OIL COOLER AND BYPASS VALVE

2 IMPLEMENT HYDRAULIC SYSTEM • Contin Continuou uous s flow at at minimum pressure with controls in HOLD • Two sectio section n gear-t gear-type ype pump • Pilot operat operated ed control control valves

The implement hydraulic system for the D11R is a continuous flow design that permits minimum pressure in the system when the implement control valves are not activated. The pump for operation of the bulldozer, ripper, and oil cooling circuits is a two section gear-type pump (large and small sections). The system components include: the pump, pilot operated control valves, demand control fan pumps, dozer control valve, quick-drop valves, dual tilt control valve, and a ripper control valve. The system components control the flow of hydraulic oil to the appropriate implement cylinders.

















STMG 692 STMG 10/97

-7-

2

3

1 4

5 6

3

• Hydrau Hydraulic lic tan tank k components: 1. Oi Oill fil filll tub tube e 2. Ma Manu nual al air ve vent nt 3. Hyd Hydrau raulic lic oil fil filter ters s 4. Si Sigh ghtt ga gaug uge e 5. S• S•O• O•S S tap tap 6. Ta Tank nk dr drai ain n

The hydraulic tank is located on the right fender just outside the operator's compartment. The oil fill tube and cap (1) 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 (2) and the breaker relief valve (not visible) are located near the filters. The vacuum breaker relief valve has a pressure setting of 3.5 kPa (.5 psi). Two hydraulic oil filters (3) are located inside the tank. The oil level sight gauge (4) 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

















STMG 692 STMG 10/97

-8-

DOZER CONTROL VALVE HOLD TILT SPOOL

ROD END TILT CYLINDER

HEAD END TILT CYLINDER FROM SMALL PUMP

FROM PILOT VALVE LIFT RELIEF VALVE

FROM LARGE PUMP ROD END LIFT CYLINDER HEAD END LIFT CYLINDER

LIFT SPOOL

4 • Dozer Dozer contro controll valve component locations

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 is for blade lift and lower and one spool is for blade tilt. The blade lift spool

















STMG 692 STMG 10/97

-9-

DOZER TILT SPOOL HOLD

SECTION A-A

A

A

TILT RIGHT

TILT LEFT FROM SMALL PUMP

FROM PILOT VALVE FROM LARGE PUMP

5 Bulldozer Tilt Circuit • Tilt circuit compo component nent locations

The tilt spool has ha s three positions: TIL TILT T RIGHT, RIGHT, HOLD, and TILT LEFT. LEFT.

















STMG 692 STMG 10/97

- 10 -

DOZER TILT SPOOL TILT RIGHT

SECTION A-A

TILT RIGHT A

TILT LEFT

A FROM SMALL PUMP

FROM PILOT VALVE FROM LARGE PUMP

6 • Pilot Pilot oil moves moves tilt tilt spool to right

When the dozer control lever is moved to the TILT RIGHT position, pilot oil goes to the left end of the tilt spool. The pressure of the pilot oil moves the tilt spool to the TILT RIGHT position. In the TILT TILT RIGHT

















STMG 692 STMG 10/97

•Tilt circuit relief valve

- 11 -

With the tilt spool in the TILT RIGHT position, flow from the small section of the pump does not combine with flow from the large section. Pilot oil at the left end of the tilt spool has moved the spool to the right. Flow from the small section of the pump goes around the tilt spool and is sent to the rod end of the tilt cylinder. Because the small 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 24300 kPa (3525 psi), 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.



















STMG 692 STMG 10/97

- 12 -

DOZER LIFT SPOOL HOLD LIFT RELIEF VALVE FROM LARGE PUMP LIFT SPOOL



















STMG 692 STMG 10/97

- 13 -

DOZER CONTROL VALVE HOLD TILT SPOOL

ROD END TILT CYLINDER

HEAD END TILT CYLINDER FROM SMALL PUMP

FROM PILOT VALVE LIFT RELIEF VALVE

FROM LARGE PUMP ROD END LIFT CYLINDER HEAD END LIFT CYLINDER

LIFT SPOOL

SHUTTLE VALVE

BALL RESOLVER



















STMG 692 STMG 10/97

- 14 -

• Du Dump mp va valve lve

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. 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.

• Shu Shuttl ttle e valv valve e

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 oil pressure is directed to the ripper valve port when the ripper function is requested by the operator or during an engine overspeed condition. When the lift spool is in the hold or center position, 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. This path is the same as when the



















STMG 692 STMG 10/97

- 15 -

DOZER LIFT SPOOL RAISE LIFT RELIEF VALVE FROM LARGE PUMP

LIFT SPOOL



















STMG 692 STMG 10/97

- 16 -

• Dump Dump valve conver converted ted 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 22750 kPa (3300 psi) due to cylinder load or an end stroke condition, the relief valve will open and allow 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 22750 kPa (3300 psi) during blade RAISE or LOWER.

• Blad Blade e "feather "feathering ing""

An additional condition can exist during dozer operation which is referred to as "feathering the blade." If the operator moves the control lever 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 cylinder and and to the spring chamber of the dump valve. This restriction to flow causes a pressure difference between the oil in the center chamber of the valve body (system pressure) and the oil in the spring chamber of the dump valve (cylinder pressure). If the pressure





















STMG 692 STMG 10/97

- 17 -

DOZER CONTROL VALVE HOLD ROD END TILT CYLINDER HEAD END TILT CYLINDER TILT SPOOL FROM SMALL PUMP

FROM PILOT VALVE DUMP VALVE

FROM LARGE PUMP ROD END LIFT CYLINDER

LIFT RELIEF VALVE

HEAD END LIFT CYLINDER





















STMG 692 STMG 10/97

- 18 -

3. Fl Flow ow con contr trol ol

When the ripper control spools are activated, pilot oil is sent to the right end of the shuttle shuttle valve valve and moves moves the shuttle shuttle valve to the the left. When the shuttle valve is moved, supply oil fills the spring chamber behind the dump valve. The pilot valve and the dump valve now function as the relief valve for the ripper circuit. Because oil from the drive end 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. Relie Relieff valv valve e for 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 within the dump valve spring chamber. chamber. This valve will lift off off its seat and allow the spring chamber oil to drain when the pressure in the





















STMG 692 STMG 10/97

- 19 -

QUICK-DROP VALVE RAISE ROD END OIL





















STMG 692 STMG 10/97

- 20 -

When the dozer control lever is moved to the RAISE position, supply oil enters the quick-drop valve through an inlet 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.





















STMG 692 STMG 10/97

- 21 -

QUICK-DROP VALVE LOWER ROD END OIL























STMG 692 STMG 10/97

- 22 -

When the dozer control lever 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 weight of the























STMG 692 STMG 10/97

- 23 -

QUICK-DROP VALVE QUICK-DROP























STMG 692 STMG 10/97

- 24 -

QUICK-DROP VALVE LOWER WITH DOWN PRESSURE























STMG 692 STMG 10/97

- 25 -

FAN DRIVE HYDRAULIC SYSTEM FAN DRIVE























STMG 692 STMG 10/97

- 26 -





































































































































































































































































































































































































































D10R Implement Systems

Recommend Documents