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Sudden movement of the machine or release of air or oil under pressure can cause possible injury or death to persons on or near the machine. To prevent possible injury or death, do the procedure that follows before testing and adjusting the Hydraulic System. |
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- Move the machine to a smooth horizontal location. Move away from any machines that are working and any personnel.
- Move the transmission shift lever to the NEUTRAL position. Stop the engine.
- Permit only one operator on the machine. Either keep other personnel away from the machine, or keep other personnel in the sight of the operator.
- Activate the parking brakes.
- Place blocks in front of the wheels and behind the wheels.
- Fully lift the body of the truck. Connect the retaining cable to the rear of the truck.
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| Illustration 1 | g00280963 |
Retaining cable that is connected to the body | |
- Disconnect the hoist control linkage. Remove the cotter pin and the pin that connects the rod to the hoist lever.
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| Illustration 2 | g00328223 |
Hoist control linkage | |
- Make sure that the transmission rotary selector spool is in the NEUTRAL-1 position.
- Make sure that all air pressure and oil pressure is released before any fittings, hoses or components are worked on.
- Push on the brake pedal many times until there is no brake air pressure.
Note: The hydraulic system involves the operation of the torque converter, the brakes, the brake cooling, and the hoist. The troubleshooting for the hydraulic system in this section deals with the brakes and the brake cooling system. Refer to Systems Operation/Testing And Adjusting, SENR6323 for more information about the hydraulic system for the hoist. Refer to Testing And Adjusting, SENR6327 for more information about the hydraulic system for the torque converter.
Troubleshooting can be difficult. There is a list of possible problems on the following pages. In order to repair a problem, refer to the problem and the probable causes that are listed below.
This list of problems and probable causes will only give an indication of the existence of a possible problem and of the repairs that may be required. There are sometimes more repairs or other repairs that are required beyond the recommendations that are in the list. Remember that a problem is not normally caused by only one part. A problem is usually caused by the relation of one part with other parts. This list can not provide all possible problems and all probable causes. The service person must find the problem and the source of the problem. The service person must then perform the necessary repairs.