Fixed Frequency and Variable Frequency
| Required Tools | ||
| Part Number | Description | Qty |
| 6V-7830 | Tetragauge | 2 |
| 6V-8628 | Elbow | 2 |
| 4J-5477 | O-Ring Seal | 2 |
| 3J-7354 | O-Ring Seal | 2 |
| 9X2348 | Hose | 36 inches |
| 9X-3757 | Coupling | 2 |
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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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| NOTICE |
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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, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates. |
Note: Perform the Charge Relief Valve - Test and Adjust and the Main Relief Valve - Test and Adjust before conducting the Pump Servo Neutral - Adjust.
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| Illustration 1 | g00462492 |
Vibratory Pump (1) Servo. (2) Servo Ports. (3) Locknut. (4) Servo valve neutral adjustment screw. (5) Main relief valve test ports. | |
- Make sure that the parking brake is applied. Make sure that the propel control lever is in neutral.
- Disconnect the electrical connection for the vibratory pump control.
- Remove the plugs from servo ports (2). Install the 3J-7354 O-Ring Seals on the 6V-8628 Elbows. Install the elbows in servo ports (2), and install the 4J-5477 O-Ring Seals in the elbows.
- Fabricate a hose assembly by using the 9X-2348 Hose and 9X-3757 Coupling . Connect the hose assembly between the elbows that were installed in the servo ports.
- Install the two 6V-7830 Tetragauges on the main relief valve test ports (5) .
- Start and run the engine at high idle.
- Read pressure readings on the two 6V-7830 Tetragauges . The pressure readings should be identical.
- If the pressure readings are not identical, loosen locknut (3) so that the neutral position of the servo piston may be adjusted. Use an allen wrench in order to turn servo valve neutral adjustment screw (4). Turn the screw clockwise or counterclockwise in order to adjust the mechanical center of the servo valve. The pressures on the two 6V-7830 Tetragauges should change. Turn servo valve neutral adjustment screw (4) until the pressure readings on main relief valve test ports are identical. Tighten locknut (3) .
- Stop the engine. Remove the two 6V-7830 Tetragauges .
- Remove the hose assembly and the elbows that connect servo ports (2), and install the two plugs.