Cerrar SIS
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Main Mai n Pump Pump (Flo (Flow) w) - Te Test st - Co Cons nsta tant nt Hor Horse sepo powe werr Flow Flow Cont Contro roll SMC SMCS - 5070-081-FW
This test measures individual pump flow at the pump. Each pump is tested individually for output flow at specified pressures. The pump that is not being tested is not under load and the pump remains at low pressure standby.
Illustration 1
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The electronic control module is located in the compartment behind the cab. (1) Alarm lamp (2) Electronic control module
Illustration 2
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(3) Monitor (4) Message display
Note: Before starting main pump flow tests, check message display (4) on monitor (3) and alarm lamp (1) on electronic control module (2) for normal operation. If no faults are present, perform the operational checks. Refer to Testing And Adjusting, "Operational Checks". Note: If the operational checks (cycle time) indicate that slow speed of an implement is common to the circuits of one pump, the problem is most likely in the hydraulic system. Then perform the pump flow tests. Refer to Testing And Adjusting, "Main Pump (Flow) - Test". Note: The engine, the fuel, or the working altitude may be the problem if the operational checks indicate that slow speed of an implement is common to both pump circuits.
Table 1 Required Parts Item Number
Part Number
Part Description
Quantity
5
4C-6482
Nipple assembly
2
6
7M-8485
O-Ring seal
2
7
4I-6141
Coupling
1
9
6V-9746
O-Ring Seal
6
10
6V-9512
Face Seal Plug
1
12
4I-6140
Coupling
1
14
6V-9853
Swivel Elbow
1
15
6V-9810
Union
1
40
5K-9090
O-Ring Seal
2
41
6V-9832
Cap
1
42
6V-8397
O-Ring Seal
1
43
6V-9508
Face Seal Plug
1
Illustration 3
Flow meter tool layout (8) Delivery line (right pump) (11) Delivery line (left pump)
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(13) Makeup Line (swing motor) (16) Swing motor (17) Right pump (18) Left pump (22) Elbow (23) Valve (24) Setup of basic flow meter and hoses
Right Pump NOTICE Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates.
Note: Perform the test for the right pump and the test for the left pump one at a time.
Illustration 4 Pump Compartment
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(8) Delivery line (right pump) (11) Delivery line (left pump) (17) Right pump (18) Left pump (19) Pressure tap (right pump delivery pressure) (20) Pressure tap (left pump delivery pressure) (21) Pressure tap (power shift pressure) (25) Negative flow control line (right pump)
1. Position the machine on level ground. 2. Stop the engine. 3. Release the pressure in the hydraulic system. Refer to Testing And Adjusting, "Hydraulic System Pressure - Release". 4. Install the following tools in accordance with the flow meter tool layout. Refer to Illustration 3. a. Assemble the basic flow meter and hoses. Note: Refer to Testing and Adjusting, "Flow Meter and Hose Setup (Basic)" for the procedure to assemble these parts.
b. Disconnect delivery line (8) from right pump (17) . c. Install seal (40) and plug (10) to the end of delivery line (8) . d. Assemble and install nipple (5) , seal (6) , coupler (7) , and seal (40) on right pump (17) .
Illustration 5
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(13) Makeup Line (swing motor) (16) Swing motor (22) Elbow
e. Disconnect makeup line (13) from elbow (22) at swing motor (16) . f. Assemble and install nipple (5) , seal (6) , coupling (12) , seal (9) , elbow (14) , seal (9) , union (15) , and seal (9) to makeup line (13) . g. Install seal (9) and cap (41) to elbow (22) . h. Connect the portable hydraulic tester between nipple (5) at right pump (17) and nipple (5) at the swing motor. i. Connect a 60000 kPa (8700 psi) pressure gauge to pressure tap (19) for right pump delivery pressure. j. Install a multitach group on the engine. This is used to monitor engine speed.
Left Pump NOTICE Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates.
Note: Perform the test for the right pump and the test for the left pump one at a time.
Illustration 6
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Pump Compartment (8) Delivery line (right pump) (11) Delivery line (left pump) (17) Right pump (18) Left pump (19) Pressure tap (right pump delivery pressure) (20) Pressure tap (left pump delivery pressure) (21) Pressure tap (power shift pressure) (38) Negative flow control line (left pump)
1. Position the machine on level ground. 2. Stop the engine. 3. Release the pressure in the hydraulic system. Refer to Testing And Adjusting, "Hydraulic System Pressure - Release". 4. Install the following tools in accordance with the flow meter tool layout. Refer to Illustration 3. a. Assemble the basic flow meter and hoses. Note: Refer to Testing and Adjusting, "Flow Meter and Hose Setup (Basic)" for the procedure to assemble these parts.
b. Disconnect delivery line (11) from left pump (18) . c. Install seal (40) and plug (10) to the end of delivery line (11) .
d. Assemble and install nipple (5) , seal (6) , coupler (7) , and seal (40) on left pump (18) .
Illustration 7
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(13) Makeup Line (swing motor) (16) Swing motor (22) Elbow
e. Disconnect makeup line (13) from elbow (22) at swing motor (16) . f. Assemble and install nipple (5) , seal (6) , coupling (12) , seal (9) , elbow (14) , seal (9) , union (15) , and seal (9) to makeup line (13) . g. Install seal (9) and cap (41) to elbow (22) . h. Connect the portable hydraulic tester between nipple (5) at left pump (18) and nipple (5) at the swing motor. i. Connect a 60000 kPa (8700 psi) pressure gauge to pressure tap (20) for left pump delivery pressure. j. Install a multitach group on the engine. This is used to monitor engine speed.
Test
To prevent personal injury or equipment damage from failure of the hydraulic test equipment or associated circuit components because of blocked pump flow, make sure that the test equipment valves are fully open before starting the engine.
To prevent personal injury and/or equipment damage from failed lines or components while the hydraulic test equipment is returned to the open flow position, slowly open the hydraulic test equipment valve while monitoring the pump flow. If pump flow does not increase as the valve is opened, shut the engine off and determine what is preventing the pump from upstroking.
1. Start the engine. 2. Place the machine controls at the following settings: engine speed dial "10" and AEC switch OFF. Refer to Testing And Adjusting, "Engine Performance - Test" for engine rpm settings. 3. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
Illustration 8
Monitor (A) Message display (B) Keypad (C) Up key (D) Left key (E) Down key (F) Right key
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(G) Cancel key (H) Set key (I) OK key (J) Menu key
4. Start Service Mode and input a fixed power shift pressure of 2400 ± 50 kPa (350 ± 7.5 psi). a. Press menu key (J) . Note: If more than thirty seconds pass between pushing the keys on the keypad, the menu mode will be cancelled and the previous display will be restored to message display (A) .
b. Press down key (E) in order to highlight the menu item "SERVICE OPTIONS" on the message display. Press OK key (I) . c. Input the password "FFF2". Press left key (D) or right key (F) in order to change the position of the flashing character. Press up key (C) or press down key (E) in order to change the value of the flashing character. Press OK key (I) after the correct password is displayed. d. Press down key (E) once in order to highlight the second line on the message display. e. Press right key (F) repeatedly until "DEVICE TEST" appears on the message display. f. Press down key (E) in order to move down one line on the message display. g. Press right key (F) until the "PS PRV - FIXED" appears on the message display. h. Press down key (E) . i. Press OK key (I) . The display on line 4 of the message display will now change to a numeric value. These characters represent the power shift pressure (kPa). j. Press left key (D) or right key (F) in order to increase or decrease the numeric value that is displayed on line 4 of the message display. Pressing left key (D) one time decreases the power shift pressure 10 kPa (1.5 psi). Pressing right key (F) one time increases the power shift pressure 10 kPa (1.5 psi). Note: The value for power shift pressure on the monitor may not always match the pressure reading on the pressure gauge. Adjust the value on the monitor until the desired power shift pressure is attained on the pressure gauge that is connected to the pressure tap for power shift pressure. The actual power shift pressure must be 2400 ± 50 kPa (350 ± 7.5 psi) on the pressure gauge. Note: To prevent a change in power shift pressure during the pump flow test, do not turn the engine start switch to the OFF position. Note: Refer to Service Manual, "Engine And Pump Electronic Control System" for
additional information on Service Mode. 5. In order to perform flow measurements for either one of the pumps, the other pump must not be under load. 6. Turn valve (23) on the portable hydraulic tester clockwise. Record pump flow at each of the following pressures in Table 3. Use pressure tap (19) to monitor right pump delivery pressure or use pressure tap (20) to monitor left pump delivery pressure.
Illustration 9
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P-Q characteristic curve
Table 2 Pump Flow Test Measuring Points
3900 kPa
15700 kPa
17700 kPa
21600 kPa
29400 kPa
