CP76 and CS76 Vibratory Compactors Propel System Piston Motor Flushing Valve (Drum) - Test and Replace Caterpillar


Piston Motor Flushing Valve (Drum) - Test and Replace
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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.

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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    
(1)     198-4234     Pressure Gauge Tool Gp     1    
(1)     198-4236     Adapter Cable As     1    
(1)     198-4237     Pressure Sensor Gp

0 to 3450 kPa (0 to 500 psi)    
1    
D     6V-9828     Cap As     1    
E     6V-9507     Plug     1    
4J-5477 O-Ring Seal     1    
F     4C-6500     Digital Thermometer     1    
( 1 ) Tool (A), Tool (B), and Tool (C) are part of the 198-4240 Digital Pressure Indicator .

  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.



    Illustration 7g01408980

  1. Loosen set screw (9). Fully rotate the needle valve in the clockwise direction.



    Illustration 8g01410994

    The Drum Pump is Shown From Left Side.

  1. Connect Tool (C) to charge pressure tap (8) on drum propulsion pump. Connect Tool (B) to Tool (C). Connect Tool (A) to Tool (B) .

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

  1. Record pressure on Tool (A) .

  1. Move propulsion lever (1) into the FORWARD range.

  1. Read pressure on Tool (A). Subtract the pressure that is recorded in this step from the pressure which was recorded in Step 14. The pressure drop should be 76 ± 48 kPa (11 ± 7 psi).

  1. Move propulsion lever (1) into the REVERSE range.

  1. Read pressure on Tool (A). Subtract the pressure that is recorded in this step from the pressure which was recorded in Step 14. The pressure drop should be 76 ± 48 kPa (11 ± 7 psi).

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

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

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

  1. If the pressure is outside the specified range, go to Step 23. If the pressure is inside the specified range, go to Step 24.



    Illustration 9g01410996

  1. Replace flushing valve (9) .

  1. Remove Tool (C). Remove Tool (D) and Tool (E). Reconnect brake supply line (7) .

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

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