785G Off-Highway Truck Systems Caterpillar


General Information

Usage:

785G RTL

------ WARNING! ------

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.


  1. Move the machine to a smooth horizontal location. Move the machine away from any machines that are working and away from any personnel.

  2. Set the transmission control to the PARK position. Stop the engine.

  3. 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.

  4. Activate the parking brakes, if equipped.

  5. Place blocks in front of the wheels and behind the wheels.


    Illustration 1g00959637
    Retaining pin for the dump body

  6. Fully lift the dump body of the truck. Install retaining pin (1) for the dump body.

  7. On machines with a transmission rotary selector spool, make sure that the transmission rotary selector spool is in the NEUTRAL-1 position.

  8. Make sure that all air pressure and oil pressure is released before you work on any fittings, hoses, or components.

  9. For machines that use brake air pressure, push the brake pedal many times until there is no brake air pressure.

Note: The hydraulic system involves the operation of the transmission, torque converter, the brakes, the brake cooling, and the hoist. The troubleshooting for the hydraulic system in this section deals with the torque converter. Refer to the Hydraulic System Testing and Adjusting for more information about the hydraulic system for the hoist. Refer to the Air System and Brakes Testing and Adjusting for more information about the hydraulic system for the brakes and the brake cooling system.

Visual Checks are the first steps for troubleshooting a problem. The visual checks will determine the problems that can be corrected quickly.

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