769D Off-Highway Truck/Tractor and 771D Quarry Truck Caterpillar

Engine Starting with Auxiliary Start Receptacle

Usage:

769D BBB

This machine is equipped with a 24 volt starting system. Use only the same voltage for jump starting. Use of a higher voltage can damage the electrical system.

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.

Show/hide table




Illustration 1	g01157865

The auxiliary start receptacle (1) is on the left side of the machine.

Some Caterpillar products may be equipped with auxiliary start receptacles. All other machines can be equipped with a receptacle from parts service. Then, a permanent receptacle is always available for jump starting.

There are two cable assemblies that can be used to jump the stalled machine. You can jump the machine from another machine that is equipped with this receptacle or an auxiliary power pack. Your Caterpillar dealer can provide the correct cable lengths for your application.

Determine the cause for the failure of the machine to start. Refer to Special Instruction, REHS0354, "Charging System Troubleshooting" for further information.
Place the transmission direction and speed control lever in the NEUTRAL position on the stalled machine. Engage the parking brake. Move all controls to the HOLD position.
On the stalled machine, turn the start switch key to the OFF position. Turn off all of the accessories.
Turn on the battery disconnect switch.
Move the machine that is used for the electrical source close to the stalled machine. The cables must reach. DO NOT ALLOW THE MACHINES TO CONTACT EACH OTHER.
Stop the engine on the machine that is used for the electrical source. When you use an auxiliary power source, turn the charging system to the OFF position.
On the stalled machine, connect the appropriate jump start cable to the auxiliary start receptacle (1).
Connect the other end of this cable to the electrical source. You must connect the cable to the auxiliary start receptacle.
Start the engine on the machine that is used for the electrical source. Also, you can energize the charging system on the auxiliary power source.
Allow the electrical source to charge the batteries for two minutes.
Attempt to start the stalled engine. Refer to Operation and Maintenance Manual, "Engine Starting". See the beginning of this topic.
Immediately after the stalled engine starts, disconnect the jump start cable from the electrical source.
Disconnect the other end of this cable from the stalled machine.
Conclude with a failure analysis on the starting charging system. Check the stalled machine, as required. Check the machine when the engine is running and the charging system is in operation.