CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Compactors Propel System Relief Valve (Charge Pressure, Drum Propel Pump) - Test and Adjust Caterpillar


Relief Valve (Charge Pressure, Drum Propel Pump) - Test and Adjust
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------ WARNING! ------

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.


------ WARNING! ------

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.


------ WARNING! ------

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

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, "AVSpare Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in AVSpare machines.

Dispose of all fluids according to local regulations and mandates.


Table 1
Required Tools 
Tool  Part
Number 
Description  Qty 
A(1)  198-4234  Pressure Gauge Tool Gp 
B(1)  198-4236  Adapter Cable As 
198-4238  Pressure Sensor Gp
0 to 35000 kPa (0 to 5000 psi) 
4C-6500  Digital Thermometer 
(1) Tool (A) and Tool (B) are part of 198-4240 Digital Pressure Indicator.

  1. Drive the machine to a smooth, horizontal surface.


    Illustration 1g01412481

  2. Move propulsion lever (1) to the NEUTRAL position.


    Illustration 2g01412483

  3. Move parking brake switch (2) to the ON position.


    Illustration 3g01412484

  4. Move throttle switch (3) to the LOW IDLE position.


    Illustration 4g01412486

  5. Move engine start switch (4) to the OFF position.


    Illustration 5g01412676

  6. Remove bolts (5) and remove right cover plate (6).


    Illustration 6g01412677

  7. Remove bolts (7) and remove left cover plate (8).

  8. Connect Tool (C) to Tool (B). Connect Tool (B) to Tool (A).


    Illustration 7g01412682
    The Drum Pump is Shown From Left Side.

  9. Connect Tool (C) to charge pressure tap (9) on the drum propulsion pump.

  10. Move engine start switch (4) to the START position. Release the switch when the engine starts.

  11. Operate the engine at low idle for few minutes. Move throttle switch (3) to the HIGH IDLE position.

  12. Monitor hydraulic oil temperature with Tool (D). Operate the machine until the oil temperature reaches 43 ± 5.6°C (110 ± 10°F).

  13. Read charge pressure on Tool (A). The pressure should be 2600 ± 250 kPa (377 ± 36 psi).

  14. Move throttle switch (3) to the LOW IDLE position.

  15. Move engine start switch (4) to the OFF position.

  16. If the pressure is inside the specified range, go to 25. If the pressure is outside the specified range, go to 17.

  17. Raise the cab. Refer to Disassembly and Assembly, KENR6004, "Cab - Tilt".


    Illustration 8g01412687
    The Drum Pump is Shown From Right Side.

  18. Remove charge relief valve (10) on the drum pump.


    Illustration 9g01412691

  19. Remove the following components from the pump housing:

    • Spool (11)

    • Poppet (12)

    • Shims (13)

    • Spring (14)

  20. Add shims (13) in order to increase pressure. Remove shims in order to decrease pressure.

    Note: A change of 1 mm (0.04 inch) in shim thickness results in a pressure change of 390 kPa (57 psi).

  21. Install the following components in the pump housing:

    • Spring (14)

    • Shims (13)

    • Poppet (12)

    • Spool (11)

  22. Install charge relief valve (10).

  23. Lower the cab but do not install cover plate (6) or cover plate (8). Refer to Disassembly and Assembly, KENR6004, "Cab - Tilt".

  24. Go to Step 10.

  25. Remove Tool (C) from charge pressure tap (9). Replace cover plate (6) and install bolts (5). Replace cover plate (8) and install bolts (7).

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