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Personal injury can result from rotating and moving parts. Stay clear of all rotating and moving parts. Never attempt adjustments while the machine is moving or the engine is running unless otherwise specified. The machine must be parked on a level surface and the engine stopped. Attach a "Do Not Operate" or similar warning tag to the start switch and controls before servicing, repairing, or making adjustments to the machine. |
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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. |
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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. |
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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 | 8T-0862 | Pressure Gauge
|
2 |
| 6V-4144 | Quick Connect Coupler | 2 | |
| B | 177-7860 | Hose As | 2 |
| 6V-4142 | Fitting | 2 | |
| 6V-4143 | Quick Connect Coupler | 2 | |
| C | 6V-3965 | Fitting As | 2 |
| 3J-1907 | O-Ring Seal | 2 | |
- Drive the machine to a smooth, horizontal surface.
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Illustration 1 g01358760 - Move propulsion lever (3) to the NEUTRAL position.
- Rotate speed dial (2) to the MINIMUM position.
- Move parking brake switch (1) to the ON position.
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Illustration 2 g01358761 - Move hopper switch (4) to the RAISE position. Release the switch when the hopper cylinders are completely retracted.
- Move screed lift switch (5) to the FLOAT position. Allow the screed to rest on the ground.
Note: The screed lift switch on the inactive operator station must also be in the FLOAT position in order to lower the screed.
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Illustration 3 g01358763 - Move throttle control switch (6) to the LOW IDLE position. Hold the switch in this position for less than 1 second.
- After the engine reaches low idle, move engine start switch (7) to the OFF position.
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Illustration 4 g01358799 - Engage lock pin (8) for the hopper on both sides of the machine.
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Illustration 5 g01390697 - Open pump compartment (9), which is on the right side of the machine.
- Assemble Tool (A), and assemble Tool (B).
- Connect Tool (A) to Tool (B).
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Illustration 6 g01390700 - Remove the plug from port "M4" (10), and remove the plug from port "M5" (11).
- Install one Tool (C) in port "M4" (10). Install the second Tool (C) in port "M5" (11).
- Connect one Tool (B) to port "M4" (10). Connect the second Tool (B) to port "M5" (11).
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Illustration 7 g01390701 - Disconnect reverse EDC (12) at the connector. Mark the connector for identification.
Note: The A332-YL(Yellow) wire and the H861-PU(Purple) wire are connected to the reverse EDC connector for the left propulsion pump. Disconnection of the EDC connector will cause a fault to appear in the monitoring system when the machine is started. After this procedure is completed, the fault must be cleared from the monitoring system.
- Disconnect forward EDC (13) at the connector. Mark the connector for identification.
Note: The 335-BR(Brown) wire and the H861-PU(Purple) wire are connected to the forward EDC connector for the left propulsion pump. Disconnection of the EDC connector will cause a fault to appear in the monitoring system when the machine is started. After this procedure is completed, the fault must be cleared from the monitoring system.
Note: The switch for the screed lift must be reset to the HOLD position before the machine will start.
- Move engine start switch (7) to the START position. Release the engine start switch when the engine starts.
- Operate the engine at low idle for a few minutes.
- Move throttle control switch (6) to the HIGH IDLE position. Hold the switch in this position for less than 1 second. The engine speed should increase to 2200 rpm.
- Read the pressure on the gauge in port "M4" (10). Read the pressure on the gauge in port "M5" (11). The pressure should be equal. If the pressure is equal, go to Step 25. If the pressure is not equal, go to Step 22.
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Illustration 8 g01390702 Note: Do not adjust the pressure beyond the rating of the gauges during the next two steps.
- Loosen locknut (14) on the pump adjustment mechanism. Turn adjustment screw (15) until the pressure at port "M4" (10) starts to increase over the pressure at port "M5" (11). Record the pressure reading on the gauge which is attached to the port "M4". Note the angular position of the wrench.
- Rotate adjustment screw (15) the opposite direction until the pressure at port "M5" (11) is equal to the pressure that was recorded during Step 21. Note the angular position of the wrench.
- Rotate adjustment screw (15) to the center of the two positions which were noted in Step 22 and Step 23. Hold the adjustment screw in place, and tighten locknut (14) to
7 N·m (62 lb in) . Go back to Step 21. - Stop the engine. Allow the oil to cool. Remove tooling. Reconnect reverse EDC connector (12). Reconnect forward EDC connector (13).
- If an adjustment was made, recalibrate the initial current setting to the electronic control module (ECM) for the pump. For the calibration procedure, refer to Specifications, Systems Operation/Testing and Adjusting, "Reverse Currents (EDC) - Calibrate" and Specifications, Systems Operation/Testing and Adjusting, "Forward Currents (EDC) - Calibrate".
