CP76 and CS76 Vibratory Compactors Propel System Piston Pump Neutral (Axle Propel Pump) - Adjust Caterpillar


Piston Pump Neutral (Axle Propel Pump) - Adjust
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Note: This test is used to center the servo piston. Check the charge pressure before the following procedure is performed.

------ 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.

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------ 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.

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------ 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.

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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     8T-0855     Pressure Gauge

0 to 4000 kPa (0 to 580 psi)    
2    
171-1879 Fitting Adapter     2    
187-3547 Fitting     2    
B     8T-0860     Pressure Gauge

0 to 40000 kPa (0 to 5800 psi)    
2    
171-1879 Fitting Adapter     2    
187-3547 Fitting     2    
C     177-7863     Hose As     2    
187-3546 Quick Disconnect Coupler     4    
D     177-7860     Hose As     1    
6V-4143 Quick Connect Coupler     2    
E     110-6349     Fitting As     2    
3J-7354 O-Ring Seal     2    
F     6V-9828     Cap As     1    
G     6V-9507     Plug     1    
4J-5477 O-Ring Seal     1    
H     6V-9829     Cap As     2    
J     6V-9508     Plug     2    
6V-8397 O-Ring Seal     2    
K     4C-6500     Digital Thermometer     1    

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



    Illustration 1g01407630

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



    Illustration 2g01407609

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



    Illustration 3g01407610

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



    Illustration 4g01407660

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



    Illustration 5g01408900

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



    Illustration 6g01408904

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

  1. Block the wheels. Block the drum.

  1. Raise the cab. Refer to Disassembly and Assembly, KENR6413, "Cab - Tilt".



    Illustration 7g01408980

  1. Loosen set screw (9). Fully rotate the needle valve in the clockwise direction in order to prevent the parking brake from releasing.



    Illustration 8g01408983

    The Drum Pump is Shown From Left Side.

  1. Disconnect balance line (10) and balance line (11) from drum pump. Use Tool (H) to cap ports. Use Tool (J) to plug the hoses.

  1. Assemble tooling. Connect Tool (B) to Tool (C). Make two sets of tools.



    Illustration 9g01410141

    The Axle Pump is Shown From Left Side.

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

    • Forward pressure tap "Mb" (12) on the axle pump

    • Reverse pressure tap "Ma" (13) on the axle pump




    Illustration 10g01410150

    The Axle Pump is Shown From Left Side.

  1. Remove the plug from port "X1" (15) of axle pump. Install Tool (E) in port "X1".

  1. Remove the plug from port "X2" (14) of the axle pump. Install second Tool (E) in port "X2".

  1. Connect one end of Tool (D) to the tap in port "X1" (15). Connect the other end of Tool (D) to the tap in port "X2" (14).

  1. Lower the cab but do not install cover plate (6) or cover plate (8). Refer to Disassembly and Assembly, KENR6413, "Cab - Tilt".

    Note: The cab mounting bolts must be installed and properly torqued before the engine is started.

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



    Illustration 11g01408994

  1. Move shift switch (16) to the HIGH SPEED position.

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

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

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

  1. Read the pressure on the gauges. The pressure on both gauges should be equal. If the pressure is not equal, go to Step 24. If the pressure is equal, go to Step 34.



    Illustration 12g01410157

    The Axle Pump is Shown From Right Side.

  1. Loosen locknut (17). Watch the pressure on the gauges. If necessary, rotate adjustment screw (18) until the pressure is equal on both gauges.

  1. Hold adjustment screw (18) in place and tighten locknut (17) .

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

  1. Remove Tool (B) from Tool (C). Install Tool (A) on Tool (C). Make two sets of tools.

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

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

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

  1. Rotate adjustment screw (18) counterclockwise until the pressure at forward pressure tap "Mb" (12) just begins to increase. Note the angular position of the wrench.

  1. Rotate adjustment screw (18) clockwise until the pressure at reverse pressure tap "Ma" (13) just begins to increase. Note the angular position of the wrench.

  1. Rotate the adjustment screw (18) to the center of the two positions that are noted above. Hold the adjustment screw in place and tighten locknut (17) .

    Note: Make sure that the pressure does not change when locknut (17) is tightened.

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

  1. Raise the cab. Refer to Disassembly and Assembly, KENR6413, "Cab - Tilt".

  1. Remove Tool (A) and Tool (C) from forward pressure tap "Mb" (12). Remove Tool (A) and Tool (C) from pressure tap "Ma" (13) .

  1. Remove Tool (D) from port "X1" (15) and port "X2" (14) .

  1. Remove Tool (E) from port "X1" (15). Install the original plug in port "X1". Remove Tool (E) from port "X2" (14). Install the original plug in port "X2".

  1. Remove Tool (H) and Tool (J) from balance line (10) and balance line (11). Reconnect both balance lines.

  1. Fully rotate the needle valve in the counterclockwise direction. Tighten set screw (9) .

  1. Lower the cab. Refer to Disassembly and Assembly, KENR6413, "Cab - Tilt".

  1. Replace cover plates (6) and (8). Install bolts (5) and (7) .

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