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


Relief Valve (Steering) - Test
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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 
198-4236 Adapter Cable As 
251-9600  Pressure Sensor
0 to 69000 kPa (0 to 10000 psi) 
4C-6500  Digital Thermometer 
7X-2540  Bolt 
(1) The 198-4234 Pressure Gauge Tool Gp and the 198-4236 Adapter Cable As are part of the 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 5g01415386

  6. Unhook latch (5) and open the engine compartment.


    Illustration 6g01415388

  7. Remove locking pin (6). Raise support bar (7), and lock the bar in position with the locking pin.

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


    Illustration 7g01415427
    The Engine is Shown From Right Side.

  9. Connect Tool (B) to steering pump pressure tap (8).


    Illustration 8g01415429

  10. Install steering lock pin (9).

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

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

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

  14. Rotate the steering wheel. Record the hydraulic oil temperature. Read pressure on Tool (A). Use the following table in order to determine the pressure specification.

    Table 2
    Steering Pressure Versus Hydraulic Oil Temperature 
    Pump Outlet Pressure  20480 kPa (2973 psi)  19980 kPa (2900 psi)  19480 kPa (2828 psi)  19230 kPa (2791 psi)  18980 kPa (2755 psi)  18780 kPa (2726 psi) 
    Temperature of Oil in Tank
    °C (°F) 
    38
    (100) 
    43
    (110) 
    49
    (120) 
    54
    (130) 
    60
    (140) 
    66
    (150) 

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

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

  17. If the steering pressure is outside the specified range, go to Step 18. If the steering pressure is inside the specified range, go to Step 27.


    Illustration 9g01415437

  18. Lift floor mat (10) and insulation (11) if the machine is equipped with a cab. Refer to Disassembly and Assembly, KENR6004, "Cab - Tilt".

    Note: If the machine is equipped with a cab, installation of the steering control unit requires two people. Do not proceed until an assistant is available.



    Illustration 10g01415439
    Three of Four Bolts Are Shown.

  19. Remove four bolts (12) and washers.

    Note: Make sure that the rubber isolation mounts remain in place when bolts (12) and washers are removed.



    Illustration 11g01415440

  20. Remove four bolts (13) and remove plate (14).


    Illustration 12g01415442

  21. Remove plug (15).


    Illustration 13g01415445

  22. Rotate adjustment screw (16) clockwise in order to increase pressure. Rotate the adjustment screw counterclockwise in order to decrease pressure.

    Note: One rotation of adjustment screw (16) results in approximately 5000 kPa (725 psi).

  23. Install plug (15).

  24. Position plate (14) on the steering control unit. Install four bolts (13). Tighten the bolts to a torque of 33 ± 5 N·m (24.3 ± 3.7 lb/ft).

    Note: It may be necessary in the following step to slightly rotate the wheel slightly in order to align the splines on the steering shaft with the splines that are in the steering control unit.

  25. Position the steering control unit, and install Tool (D) in one of the holes at the base of the steering column. Install second Tool (D) in another hole. Align the plate and tighten Tool (D) in order to pull the steering control unit into position. After the steering control unit is splined to the steering column, install two bolts (12) and washers. Remove Tool (D) from both holes. Install two bolts (12) and washers.

  26. Replace insulation (11) and replace floor mat (10). Go to Step 11.

  27. Remove steering lock pin (9). Remove Tool (B). Close the engine compartment.

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