SEAL 6Y3837 - Caterpillar

The battery disconnect switch is on the left side of the engine near the rear of the engine.
Illustration 1 g02061718
ON - 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.The battery disconnect switch operates differently than the engine start switch. When the battery disconnect switch is in the OFF position, the electrical system is disabled. When the battery disconnect switch is in the ON position, the battery remains connected to the entire electrical system. The battery remains connected even if the engine start switch is turned 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. Turn the battery disconnect switch to the OFF position and remove the disconnect switch key when you service components on the engine.Turn the battery disconnect switch to the OFF position and remove the disconnect switch key if you are not going to operate the engine for an extended period. Turning the battery disconnect switch to the OFF position and removing the disconnect switch key will prevent drainage of the battery.
Never move the battery disconnect switch to the OFF position while the engine is operating. Serious damage to the electrical system could result.
To ensure that no damage to the engine occurs, verify that the engine is fully operational before cranking the engine. Do not crank an engine that is not fully operational.Perform the following procedure in order to check the battery disconnect switch for proper operation:
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.
Turn the battery disconnect switch to the OFF position.
Verify that the following items are not functioning: electrical components in the operator compartment, hour meter and engine cranking. If any of the items continue to function with the battery disconnect switch in the OFF position, consult your Cat dealer.