WASHER 8U5983 - Caterpillar

Illustration 1 g00322856
Manual Barring Group (50:1 Reduction) (1) Shaft with gear and grease fitting. (2) Locking nut. (3) Knob. (4) Adapter.The manual barring group (50:1 reduction) allows an electrically driven motor to be used in order to turn the engine slowly. The manual barring group is used while service work is being performed.Use the following procedure in order to engage the manual barring group:
Loosen locking nut (2) .
Pull knob (3) outward while pressing inward on locking nut (2) until the nut is flush with the housing. The nut is part of the pinion shaft which is spring loaded.Note: If locking nut (2) cannot be flush with the housing, the shaft gear is not meshed with the flywheel ring gear. Maintain inward pressure on the nut while adapter (4) is carefully adjusted. Adjustment of the adapter is achieved by turning the adapter in a clockwise direction or a counterclockwise direction. The adjustment may require the adapter to be turned more than one revolution in any direction. Adjust the adapter until locking nut (2) can be flush with the housing.
Release knob (3) and slowly remove hand pressure from locking nut (2) until the knob engages in the slot of the pinion shaft.When the manual barring group is in the engaged position, the engine starting system is disabled.To turn the engine crankshaft, use the motor control. The manual barring group (50:1 reduction) is directly coupled to an electric motor. The electric motor produces the torque that is required to turn the crankshaft in either direction.
Do not use an impact wrench to operate the barring device. The use of an impact wrench will cause gear tooth failure.
The engine crankshaft is locked in place when the pinion gear on shaft (1) is engaged with the flywheel ring gear.Use the following procedure in order to disengage the manual barring group:
Pull knob (3) outward while pressing inward on locking nut (2) until the spring on shaft (1) moves the pinion to the disengaged position.
Check that the pinion gear is fully disengaged.Note: The pinion gear is fully disengaged when locking nut (2) passes by the housing.
Release knob (3) .
Tighten locking nut (2) .Tighten the locking nut to the following value. ... 70 15 N m (50 11 lb ft)Note: If shaft (1) fails to fully return to the disengaged position, rotate the adapter in either direction. Rotating the adapter in either direction reduces the side loading (friction) between the pinion gear and the flywheel ring gear.
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.
When the manual barring group is not activated, the manual barring group must be disengaged from the flywheel and the manual barring group must be secured in the disengaged position.