785G Off-Highway Truck Caterpillar

Illustration 1	g06136506
The power receptacle is located to the left of the control box on the bumper. (1) Power Receptacle (2) Battery Disconnect Switch

Auxiliary start receptacle (1) provides a dedicated connection that is available for jump starting.

Note: When an electrical power source is connected to the auxiliary start receptacle and the battery disconnect switch (2) is in the OFF (disabled) position, the electrical system will remain de-energized. This prevents jump starting capabilities when the battery disconnect switch (2) is in the OFF position.

A stalled machine can be jump-started from another machine that is equipped with an auxiliary start receptacle or a stalled machine can be jump-started from an auxiliary power pack. Your Caterpillar dealer can provide the correct cable lengths for your application.

1. Determine the failure of the machine to start. Refer to Special Instructions, REHS0354, "Charging System Troubleshooting".

2. Place the transmission control in the P position on the stalled machine. Move all controls to the HOLD position.

3. On the stalled machine, turn the start switch key to the OFF position. Turn off all the accessories.

4. Turn on the battery disconnect switch (2).

5. 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.

6. 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.

7. On the stalled machine, connect the appropriate jump-start cable to the auxiliary start receptacle.

8. Connect the other end of this cable to the electrical source. The cable must be connected to the auxiliary start receptacle.

9. Start the engine on the machine that is used for the electrical source. Energize the charging system if an auxiliary power source is used.

10. Allow the electrical source to charge the batteries for 2 minutes.

11. Attempt to start the stalled engine. Refer to Operation and Maintenance Manual, "Engine Starting". See the beginning of this topic.

    Only 3 cranking cycles, with a maximum duration of 30 seconds per cranking cycle, are allowed for jump starting. 2 minutes rest MUST be taken between cranking cycles.

    After 3 unsuccessful cranking cycles perform the following:

    • Recharge the batteries.

    • Allow starters to cool to near ambient temperatures.

    • Investigate possible reasons why the machine did not start.

12. Immediately after the stalled engine starts, disconnect the jump-start cable from the electrical source.

13. Disconnect the other end of this cable from the stalled machine.

14. 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.