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


Pressure Override Valve (Axle Propel Pump) - Test and Adjust
`

------ 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 
198-4236 Adapter Cable As 
251-9600  Pressure Sensor
0 to 69000 kPa (0 to 10000 psi) 
6V-9828  Cap As 
6V-9507  Plug 
4J-5477 O-Ring Seal 
6V-9829  Cap As 
6V-9508  Plug 
6V-8397 O-Ring Seal 
4C-6500  Digital Thermometer 
(1) Tool (A) is 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.

  6. Block the wheels. Block the drum.

  7. Assemble Tool (A). Connect Tool (A) to Tool (B).


    Illustration 5g01412676

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


    Illustration 6g01412677

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


    Illustration 7g01412798

  10. Disconnect brake supply line (9) from the drum. Use Tool (C) to cap the port. Use Tool (D) to plug the hose.

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


    Illustration 8g01413630
    The Drum Pump is Shown From Left Side.

  12. Disconnect balance line (10) and balance line (11) from drum pump. Use Tool (E) to cap ports. Use Tool (F) to plug the hoses.


    Illustration 9g01413841
    The Drum Pump is Shown From Left Side.

  13. Disconnect electrical connector (12) for the drum interlock from the drum pump.


    Illustration 10g01413843
    The Axle Pump is Shown From Left Side.

  14. Connect one Tool (B) to each of the following pressure taps:

    • Forward pressure tap (13) on the axle pump

    • Reverse pressure tap (14) on the axle pump

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

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

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

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


    Illustration 11g01413829

  19. Move shift switch (15) to the HIGH SPEED position. Move parking brake switch (2) to the RELEASE position.

  20. Modulate propulsion lever (1) forward until the peak pressure is registered at forward pressure tap (13) (approximately one-half of the total travel). Read pressure on Tool (A). Move the propulsion lever to the NEUTRAL position. The pressure should be 44000 ± 1000 kPa (6380 ± 145 psi).

  21. Modulate propulsion lever (1) to the rear until the peak pressure is registered at reverse tap (14) (approximately one-half of the total travel). Read pressure on Tool (A). The pressure should be 44000 ± 1000 kPa (6380 ± 145 psi).

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

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

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

  25. Move engine start switch (3) to the OFF position.

  26. If either pressure reading is outside the specified range, go to Step 27. If both pressure readings are inside the specified range, go to Step31.


    Illustration 12g01413847
    The Axle Pump is Shown From Left Side.

  27. Remove the cap from the POR valve. Loosen the locknut and rotate adjustment screw (16) clockwise in order to increase POR pressure. Rotate the adjustment screw counterclockwise in order to decrease POR pressure.

  28. Hold adjustment screw (16). Tighten the locknut.

  29. Go to Step16.

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

  31. Remove Tool (E) and remove Tool (F) from balance line (10) and balance line (11). Reconnect both of the balance lines.

  32. Reconnect electrical connector (12) for the drum interlock.

  33. Remove Tool (B) from pressure tap (12) and pressure tap (14).

  34. Remove Tool (C) and Tool (D). Reconnect brake supply line (9) to the drum motor.

  35. Lower the cab. Refer to Disassembly and Assembly, KENR6004, "Cab - Tilt".

Information System:

140M and 150 Motor Grader Steering Control Valve - Install
140M and 150 Motor Graders Engine Supplement Radiator Guard and Support, Aftercooler, Hydraulic Oil Cooler, and Radiator, - Install
CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Compactors Propel System Pressure Override Valve (Drum Propel Pump) - Test and Adjust
R1600G Load Haul Dump Machine Electrical System Actual Gear Indicator
R1600G Load Haul Dump Machine Electrical System Engine Stop
R1600G Load Haul Dump Machine Electrical System Engine Start
R1600G Load Haul Dump Machine Electrical System Engine Start (Remote Control)
R1600G Load Haul Dump Machine Electrical System Autoshift Control (STIC Steering)
R1600G Load Haul Dump Machine Electrical System Heating and Air Conditioning
R1600G Load Haul Dump Machine Electrical System Main Power Relay
CB34, CB34XW and CC34 Utility Compactors Belts - Inspect/Adjust/Replace
R1600G Load Haul Dump Machine Systems Ejector Bucket - Disassemble
CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Compactors Propel System Piston Pump Neutral (Drum Propel Pump) - Adjust
140M and 150 Motor Grader Control Manifold (Steering Backup) - Remove
140M and 150 Motor Grader Control Manifold (Steering Backup) - Install
CB22, CB24, CB32 and CC24 Utility Compactors Safety Messages
CB22, CB24, CB32 and CC24 Utility Compactors Sound Information and Vibration Information
CB22, CB24, CB32 and CC24 Utility Compactors Specifications
CB22, CB24, CB32 and CC24 Utility Compactors Plate Locations and Film Locations
Air Conditioning and Heating R134a for All Caterpillar Machines Refrigerant Compressor
CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Compactors Propel System Piston Pump Neutral (Axle Propel Pump) - Adjust
CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Compactors Propel System Pump Control (Manual Displacement Control) Neutral (Drum Propel) - Test and Adjust
2007/10/01 A New Transmission Speed Sensor is Now Available for Series H-Series Motor Graders {3175}
CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Compactors Propel System Pump Control (Manual Displacement Control) Neutral (Axle Propel) - Test and Adjust