CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Soil Compactors Machine Systems Relief Valve (Main, Vibratory) - Test and Adjust Caterpillar


Relief Valve (Main, Vibratory) - Test and Adjust
`

------ 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.


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

Personal injury can result from rotating and moving parts.

Moving fan blades and moving parts will throw or cut any object or tool that falls or is pushed into them.

Make sure no one is working on, underneath or close to an engine that is running. Make sure the area is free of personnel.



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.



NOTICE

In order to avoid damage to the vibrator system during testing, always perform the testing with the vibrator drum on top of tires or on loose dirt. Tires will simulate a non-compacted soil condition

Never operate the vibrator system when the machine is on concrete.



NOTICE

If a testing time longer than three minutes is required, rotate the drum periodically in order to lubricate the eccentric weight shaft bearings.


Table 1
Required Tools 
Tool  Part
Number 
Description  Qty 
8T-0861  Pressure Gauge
0 to 60000 kPa (0 to 8700 psi) 
6V-3989 Fitting 
177-7861  Hose As 
6V-4143 Quick Connect Coupler 
4C-6500  Digital Thermometer 

  1. Drive the machine to a smooth, horizontal surface on loose, uncompacted soil.

    Note: If loose, uncompacted soil is unavailable, drive the machine onto an unusable, unmounted tire without rims and with a carcass of substantial stiffness to support the drum. If tires are used, the drum should be a minimum of 102 mm (4 inch) above the ground.



    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.

    Note: The cab can be tilted in order to provide greater access to components under the cab. However, the cab must be lowered and fastened before the machine is operated. Refer to Disassembly and Assembly, KENR6004, "Cab - Tilt".



  6. Illustration 5g01412676

  7. Remove bolts (5) and remove right cover plate (6) with seals (not shown).


    Illustration 6g01412677

  8. Remove bolts (7) and remove left cover plate (8) with seals (not shown).

  9. Connect Tool (A) to Tool (B). Make two sets of tools.


    Illustration 7g01414983
    The Vibrator Pump is Shown From Right Side.

  10. Remove the cap from port "Mb" (9). Connect one Tool (B) to the low amplitude pressure tap in port "Mb" (9) on the vibratory pump.


    Illustration 8g01414987
    The Vibrator Pump is Shown From Left Side.

  11. Remove the cap from port "Ma" (10). Connect the second Tool (B) to the high amplitude pressure tap in port "Ma" (10) on the vibratory pump.

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

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

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


    Illustration 9g01414990

  15. Move amplitude selector switch (11) to the LOW AMPLITUDE position.


    Illustration 10g01414995

  16. Actuate vibratory switch (12) on the propulsion lever.

  17. Watch the pressure at port "Mb" (9). Record the initial pressure reading as the main relief pressure. An initial pressure reading registers on the gauge for a brief period and then the pressure is reduced to operating pressure. The main relief pressure should be 35000 ± 3000 kPa (5075 ± 435 psi).

  18. Actuate vibratory switch (12) in order to stop the vibratory system.

  19. Move amplitude selector switch (11) to the HIGH AMPLITUDE position.

  20. Actuate vibratory switch (12) on the propulsion lever.

  21. Watch pressure at port "Ma" (10). Record the initial pressure reading as the main relief pressure. An initial pressure reading registers on the gauge for a brief period and then the pressure is reduced to operating pressure. The main relief pressure should be 35000 ± 3000 kPa (5075 ± 435 psi).

  22. Actuate vibratory switch (12) in order to stop the vibratory system.

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

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

  25. If the pressure is inside the specified range, go to Step 28. If the pressure is outside the specified range, go to Step 26.


    Illustration 11g01414998
    Low Amplitude Vibrator Relief Valve


    Illustration 12g01414999
    High Amplitude Vibrator Relief Valve

  26. Use the following procedure to adjust the main relief valves:

    1. Remove cap (13) or (14) from the relief valve that is to be adjusted.

    2. Remove the relief valve cartridge from the pump. Reinstall cap (13) or (14) in order to prevent oil from leaking out of the ports.


      Illustration 13g01415002
      Arrows Indicate Clamping Position.

    3. Clamp the relief valve cartridge in a soft vise jaw. Loosen locking setscrew (15) with a 3 mm Allen wrench.

    4. Use a 5 mm wrench to turn spindle (16). Turn the spindle clockwise in order to increase pressure. Turn the spindle counterclockwise in order to decrease pressure.

      Note: One full revolution of spindle (16) changes the pressure setting by approximately 4400 kPa (638 psi).

    5. Tighten locking setscrew (15).

    6. Remove the relief valve cartridge from the vise.

    7. Remove relief valve cap (13) or (14) and install the relief valve cartridge in the vibration pump. Reinstall the relief valve cap.

  27. Go to Step 12.

  28. Remove Tool (B) from port "Ma" (10) and from port "Mb" (9). Reinstall rubber caps.

  29. Replace cover plate (6) and install bolts (5). Replace cover plate (8) and install bolts (7).