Personal injury or death can result from sudden machine movement. Sudden movement of the machine can cause injury to persons on or near the machine. To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine. |
Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. |
NOTICE |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. 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 Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates. |
Required Tools     | |||
---|---|---|---|
Tool     | Part Number     |
Description     | Qty     |
A     | 1U-5796     | Pressure Differential Tool Gp     | 1     |
B     | 6V-9832     | Cap As     | 1     |
C     | 6V-9511     | Plug     | 1     |
D     | 6V-9746     | O-Ring Seal     | 1     |
E     | 4C-6500     | Digital Thermometer     | 1     |
F     | 177-7860     | Hose As     | 1     |
G     | 8T-0860     | Pressure Gauge     | 1     |
- Drive the machine to a smooth, horizontal surface.
- Move propulsion lever (2) to the NEUTRAL position.
Illustration 1 | g01163097 |
- Rotate speed dial (3) to the MINIMUM position.
- Move parking brake switch (4) to the ON position.
- Move screed lower switch (6) to the DOWN position. Lower the screed to the ground.
- Move throttle control switch (5) to the LOW IDLE position. Hold the switch in this position for less than 1 second.
- Move engine start switch (1) to the OFF position after the engine reaches low idle.
- Move key switch (7) to the OFF position.
Illustration 2 | g01163099 |
- Open the front access door which is on the left side of the machine.
Margin Pressure Test and Adjust
- Install Tool (A) . Connect the high pressure side of the tool to port "TP" (9) . Connect the low pressure side of the tool to port "TA" (8) .
Illustration 3 | g01163101 |
- Move key switch (7) to the ON position. Move engine start switch (1) to the START position. Release the engine start switch after the engine starts.
- Move throttle control switch (5) to the HIGH IDLE position. Hold the switch in this position for less than 1 second. The engine speed should increase to 2310 rpm.
- Monitor the hydraulic oil temperature with Tool (D) . Operate the machine until the oil temperature reaches 43 ± 5.6°C (110 ± 10°F).
- Move generator switch (10) to the ON position.
Illustration 4 | g01163110 |
- Read the pressure differential on Tool (A) . The differential should be 1655 -69/+276 kPa (240 -10/+40 psi).
- Move generator switch (10) to the OFF position.
- Move throttle control switch (5) to the LOW IDLE position. Hold the switch in this position for less than 1 second.
- Move engine start switch (1) to the OFF position after the engine reaches low idle.
- Move key switch (7) to the OFF position.
- If the pressure differential is within the specified range, go to Step 15. If the pressure differential is not within the specified range, go to Step 12.
- Loosen set screw (12) for spool (13) . In order to increase pressure, rotate adjustment screw (11) clockwise. In order to decrease pressure, rotate the adjustment screw counterclockwise.
Illustration 5 | g01215801 |
Removed for photo purposes |
- Hold adjustment screw (11) . Tighten set screw (12) .
- Go to Step 2.
- Remove the tooling. Perform the procedure that is in the "Pressure Compensator Test and Adjust" section.
Pressure Compensator Test and Adjust
- Disconnect the outlet hose at fitting (14) from fitting (15) . Cap fitting (15) . Plug fitting (14) .
Illustration 6 | g01163123 |
- Install Tool (F) and Tool (G) on port "TP" (9) .
- Move key switch (7) to the ON position. Move engine start switch (1) to the START position. Release the engine start switch after the engine starts.
- Move throttle control switch (5) to the HIGH IDLE position. Hold the switch in this position for less than 1 second. The engine speed should increase to 2310 rpm.
- Monitor the hydraulic oil temperature with Tool (E) . Operate the machine until the oil temperature reaches 43 ± 5.6°C (110 ± 10°F).
- Move generator switch (10) to the ON position.
- Read the pressure on Tool (G) . The pressure should be 25000 ± 690 kPa (3626 ± 100 psi).
- Move generator switch (10) to the OFF position.
- Stop the engine. If the pressure is within the specified range, go to Step 13. If the pressure is outside the specified range, go to Step 10.
- Loosen set screw (17) for spool (18) . In order to increase pressure, rotate adjustment screw (16) clockwise. In order to decrease pressure, rotate the adjustment screw counterclockwise.
Illustration 7 | g01215805 |
Removed for photo purposes |
- Hold adjustment screw (16) . Tighten set screw (17) .
- Go to Step 3.
- Remove the tooling. Reconnect fitting (14) and fitting (15) .