CP54 and CS54 Vibratory Soil Compactors Machine Systems Piston Pump Neutral (Vibratory) - Test and Adjust Caterpillar

Show/hide table

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.

Show/hide table

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.

Show/hide table

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.

Note: This test is used to center the servo piston. Check charge pressure before the following procedure is performed.

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

Show/hide table



Illustration 1	g01415204

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

Show/hide table



Illustration 2	g01415246

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

Show/hide table



Illustration 3	g01415249

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

Show/hide table



Illustration 4	g01415252

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

6. Block the wheels. Block the drum.

7. If necessary, raise the cab. Refer to Disassembly and Assembly, KENR6047, "Cab - Tilt".

8. Assemble tooling. Connect Tool (B) to Tool (C). Make two sets of Tool (B) and Tool (C) .

Show/hide table



Illustration 5	g01416771
Right Side View of the Vibrator Pump

9. Remove the cap from port "Mb" (5). Connect one Tool (B) to the low amplitude pressure tap in port "Mb" (5) on the vibratory pump.

Show/hide table



Illustration 6	g01416777
Left Side View of the Vibrator Pump

10. Remove the cap from port "Ma" (6). Connect second Tool (B) to the high amplitude pressure tap in port "Ma" (6) on the vibratory pump.

Show/hide table



Illustration 7	g01416779
Right side View of the Vibrator Pump

11. Remove the plug from port "X1" (7) of vibratory pump. Install Tool (E) in the "X1" port.

12. Remove the plug from port "X2" (8) of the vibratory pump. Install second Tool (E) in the "X2" port.

13. Connect one end of Tool (D) to the tap in port "X1" (7). Connect the other end of Tool (D) to the tap in port "X2" (8).

Show/hide table



Illustration 8	g01416783
Right Side View of the Vibrator Pump

14. Disconnect electrical connector (9) for the high amplitude solenoid.

15. Disconnect electrical connector (10) for the low amplitude solenoid.

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 (F). Operate the machine until the oil temperature reaches 43° ± 5.6°C (110° ± 10°F).

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

20. Read the pressure on the gauges. The pressure on both gauges should be equal. If the pressure is equal, go to Step 23. If the pressure is not equal, go to Step 21.

Show/hide table



Illustration 9	g01416786
Bottom View of the Vibrator Pump

21. Loosen locknut (11). Watch the pressure on the gauges. If necessary, rotate adjustment screw (12) until the pressure is equal on both gauges.

22. Hold adjustment screw (12), and tighten locknut (11) .

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

24. Remove Tool (B) from Tool (C). Install Tool (A) on Tool (C). Repeat for second Tool (C) .

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

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

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

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

    Note: Do not adjust the pressure past the rating of the gauges in the following steps.

29. Loosen locknut (11). Watch the pressure on the gauges. If necessary, rotate adjustment screw (12) until the pressure is equal on both gauges.

30. Rotate adjustment screw (12) clockwise until pressure at pressure tap (6) in port "Ma" just begins to increase. Note the angular position of the wrench.

31. Rotate adjustment screw (12) counterclockwise until pressure at pressure tap (5) in port "Mb" just begins to increase. Note the angular position of the wrench.

32. Move adjustment screw (12) until the pressure is between the two previous pressure readings. Hold the adjustment screw in place, and tighten locknut (11) .

    Note: Make sure that the pressure does not change when locknut (11) is tightened.

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

34. Remove the tooling from port "Ma" (6). Remove the tooling from port "Mb" (5) .

35. Remove Tool (D) from port "X1" (7) and from port "X2" (8). Remove Tool (E) from port "X1" and from port "X2". Reinstall plugs.

36. Connect electrical connector (9) for the high amplitude solenoid.

37. Connect electrical connector (10) for the low amplitude solenoid.

38. If necessary, lower and fasten the cab. Refer to Disassembly and Assembly, KENR6047, "Cab - Tilt".

39. If necessary, reinstall cover plates and bolts.