LINE ASSEM. (no. 7) 6N4737 - Caterpillar

Do not use an impact wrench to operate the barring device. The use of an impact wrench will cause gear tooth failure.
Guards must be in place prior to operating barring device motor.Remove all hand tools prior to operating barring device motor.
Note: Prelube of the engine is required before the crankshaft is rotated for normal maintenance.The barring device provides a means for slowly turning the flywheel in order to service the engine. When the barring device is in the engaged position, the engine starting system is disabled.When the barring device is not used, the barring device must be fully disengaged from the flywheel and secured in the disengaged position. Refer to the Service Manual for information on operation of the barring device.
Do not operate the engine starting motor until the barring group pinion gear is fully disengaged from the flywheel ring gear. Serious damage to the engine could result.
Electric Barring Device
Note: This type of barring device may be electrically driven or manually driven.
Illustration 1 g00334420
Rear view of an electrically driven barring device
Lubricating the Pinion
Illustration 2 g01098831
Section view of a barring device without the electric motor
(1) Grease fitting
(2) Vent
Ensure that the barring device is locked in the disengaged position.
Lubricate grease fitting (1) with Cat Advanced 3Moly Grease until the grease is visible at vent (2). Lubricating the Reducer
Illustration 3 g00991445
Ensure that the barring device is locked in the disengaged position.
Remove level plugs (2) and check the lubricant level.
If necessary, remove cap (1) and add Caterpillar 4C-6767 Synthetic Oil until the oil is visible at the level plugs.
Reinstall the level plugs and reinstall the cap. Manual Barring Device
Illustration 4 g01098833
(1) Grease fitting
(2) Gear end
Ensure that the barring device is locked in the disengaged position.
Lubricate grease fitting (1) with Cat Advanced 3Moly Grease until the grease is visible at gear end (2).