785D OEM Off-Highway Truck Battery Disconnect Switch Caterpillar


Battery Disconnect Switch
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NOTICE

Never move the battery disconnect switch to the OFF position while the engine is operating. Serious damage to the electrical system could result.




Illustration 1g01525876
The battery disconnect switch (1) is located on the lower right front side of the machine on the bumper.

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

Battery Disconnect Switch (1) - When the battery disconnect switch is in the OFF position, the electrical system is disabled. When the battery disconnect switch is turned to the ON position, the battery remains connected to the entire electrical system.

ON - In order to activate the electrical system, insert the disconnect switch key and turn the battery disconnect switch clockwise. The battery disconnect switch must be turned to the ON position before you start the engine.

OFF - To deactivate the electrical system, turn the battery disconnect switch counterclockwise to the OFF position.

Turn the battery disconnect switch to the OFF position and remove the disconnect switch key when you service the electrical system or other components on the machine.

Turn the battery disconnect switch to the OFF position and remove the disconnect switch key if you do not operate the machine for an extended period of a month or more. This will prevent the battery from being discharged. The following problems can cause battery discharge.

  • Short circuits

  • Current draw via some components

Note: The battery disconnect switch does not release hydraulic pressure from the secondary steering system or hydraulic pressure from the automatic retarder control system. In order to release the hydraulic pressure, move the engine start switch to the OFF position. This will activate a solenoid valve in order to release the hydraulic pressure from the accumulators.

Verify that the engine is fully operational before cranking the engine in order to ensure that no damage will occur to the engine. Do not crank an engine that is not fully operational.

Perform the following procedure in order to check the functionality of the battery disconnect switch:

  1. With the battery disconnect switch in the ON position, verify that electrical components in the operator compartment are functioning. Verify that the hour meter is displaying information. Verify that the engine will crank.

  2. Turn the battery disconnect switch to the OFF position.

  3. Verify that the following items are not functioning: the electrical components in the operator station, the hour meter and the engine starter. If any of the items continue to function with the battery disconnect switch in the OFF position, contact your AVSpare dealer.

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