794 AC Off-Highway Truck Caterpillar

Prepare the Machine for Maintenance

Usage:

Park the machine on a dry, level, solid surface that is free of any debris.

Note: The surface must be solid enough to support the weight of the machine and any tooling that is used to support the machine.

Show/hide table




Illustration 1	g03696692

Make sure that shift control lever (3) is in the PARKING BRAKE APPLIED P position.

Parking brake indicator (2) will illuminate once all pressure has been released from park brakes.

Refer to Operation and Maintenance Manual, "Changing Direction and Speed" for more information.

Move the hoist control to the FLOAT position in order to lower the dump body. Refer to Operation and Maintenance Manual, "Operator Controls" for more information.

Install wheel chocks on the machine. Refer to Operation and Maintenance Manual, "Use of Wheel Chocks" for more information.

When it is not possible to use wheel chocks, ensure that the machine is unable to roll by turning the wheels into a suitable bank or placing with the wheels in a suitable ditch.

Ensure that the pressure is released from any closed system that will be opened during the maintenance procedure. Refer to Operation and Maintenance Manual, "System Pressure Release" for more information.

Note: Use the hydraulic cabinet gages to verify pressure release in each system.

For maintenance that is required on the high voltage electrical components, perform a high voltage shutdown and discharge procedure. Refer to Operation and Maintenance Manual, "Electrical Shutdown and Voltage Discharge" for more information.

For maintenance that requires the dump body to be in the raised position, install the truck body retaining cables. Refer to Operation and Maintenance Manual, "Cable (Truck Body Retaining)" for more information.

This machine is equipped with lockout controls in order to suit the following types of machine maintenance:

Maintenance that requires the engine to be running
Maintenance that DOES NOT require the engine to be running
Maintenance that requires the electrical system to be disabled

For maintenance that requires the engine to be running, perform the following:

Show/hide table

Personal injury or death can occur if personnel are trapped between the wheel and the frame.
The steering system is hydraulically controlled and wheels can crush personnel during movement.

Use caution when working between the wheels and the frame. If the wheels must be turned, ensure that all personnel are clear of the machine before any movement.

Run the engine at an idle.
Show/hide table

Illustration 2 g03663024
Move battery disconnect switch (1) to the OFF position. Refer to Operation and Maintenance Manual, "Battery Disconnect Switch" for the proper procedure.

For maintenance that DOES NOT require the engine to be running, perform the following:

Move the engine start switch to the OFF position. Refer to Operation and Maintenance Manual, "Operator Controls" for more information.

Move battery disconnect switch (1) to the OFF position. Refer to Operation and Maintenance Manual, "Battery Disconnect Switch" for the proper procedure.

For maintenance that requires the 24V electrical system to be disabled, perform the following:

Move the engine start switch to the OFF position. Refer to Operation and Maintenance Manual, "Operator Controls" for more information.
Move battery disconnect switch (1) to the OFF position. Refer to Operation and Maintenance Manual, "Battery Disconnect Switch" for the proper procedure.