Pump Control (Manual Displacement Control) Neutral - Test and Adjust
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| Required Tools | ||
| Part Number | Description | Quantity |
| 8T-0859 | Pressure Gauge 25000 kPa (3600 psi) |
1 |
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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 product. 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 on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
- Make sure that the parking brake is applied. Make sure that the propel control lever is in NEUTRAL position.
- Place blocks under both sides of the drums and the tires (if equipped).
- Set the brakes by disconnecting the wiring harness for brake solenoid (1). The wiring harness is identified by wire number 777-PU.
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| Illustration 1 | g00954455 |
Brake Interlock Valve (1) Wiring harness for the brake solenoid | |
- Disconnect control linkage (2) from the displacement unit.
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| Illustration 2 | g00869065 |
Manual Displacement Control "MDC" (2) Control linkage | |
- Disconnect the lines for interlock line (3) and (4). Cap the fittings for the interlock line immediately. Connect two 25000 kPa (3626 psi) gauges into the ends of interlock lines (3) and (4) .
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| Illustration 3 | g00869073 |
- Start the engine. Run the engine at 1050 rpm.
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| Illustration 4 | g00869085 |
Propel Pump (5) "MDC" Neutral adjustment screw (6) Locknut | |
- Loosen locknut (6) on the "MDC" neutral adjustment screw (5). Turn "MDC" neutral adjustment screw (5). Look at the pressure gauges. The pressures on the two gauges should be equal.
Note: The pump was removed for photographic purposes.
- Turn the "MDC" neutral adjustment screw (5) clockwise until the other pressure gauge shows an increase in pressure. Mark the position of the screw.
- Turn the "MDC" neutral adjustment screw (5) counterclockwise until the other pressure gauge shows an increase in pressure. Mark the position of the screw. Turn the "MDC" adjustment screw (5) to half the distance of the previous adjustment.
- Hold the "MDC" adjustment screw (5). Tighten locknut (6) to a torque between 14 N·m (10 lb ft) and 24 N·m (18 lb ft).
- Stop the engine. Remove the pressure gauges from interlock line (3) and (4). Reconnect interlock lines (3) and (4) to the brake interlock valve. Reconnect control linkage (2) to the "MDC" unit. Reconnect the wiring harness for the brake solenoid.
- Remove the blocks from the drums and the tires (if equipped).
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