HOUSING-PINION 8R0931 - Caterpillar

Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-1854 Retaining Ring Pliers 1
B - Plate
51.0 by 102.0 by 6.0 mm (2.00 by 4.00 by 0.25 inches) 2
C 1P-1857 Retaining Ring Pliers 1
D - Allen Wrench (5/16 inch) 1 Start By:
Remove the air starting motor. Refer to Disassembly and Assembly, "Air Starting Motor - Remove".
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Note: Ensure that there is a complete set of new gaskets, vanes, seals, and O-ring seals before the air starting motor is disassembled.Note: The illustrations that follow show a different orientation of the components from the air starting motor that was removed from the engine. Use the procedures that are given. Maintain the alignment of the components of the air starting motor.
Illustration 1 g00538952
Remove elbow (1) and the gasket from cover assembly (2).
Illustration 2 g00538959
Remove silencer (4) and the gasket from motor housing (3).
Illustration 3 g00538960
Mark the housing in order to show the position of motor housing (3) in relation to gear case (7) for assembly. Remove bolts (5) in order to remove gear case (7) and drive housing (6) as a unit from motor housing (3).
Illustration 4 g00538961
Use Tooling (A) in order to remove ring (9) from drive gear (8).
Illustration 5 g00538963
Personal injury can result from parts and/or covers under spring pressure.Spring force will be released when covers are removed.Be prepared to hold spring loaded covers as the bolts are loosened.
Note: Air starting motors for standard engine rotation rotate clockwise when the motors are viewed from the pinion end of the starting motor. Bolt (10) for a clockwise rotation starting motor has left hand threads.Note: Air starting motors for reverse engine rotation rotate counterclockwise when the motors are viewed from the pinion end of the starting motor. Bolt (10) for a counterclockwise rotation starting motor has right hand threads.
Remove bolt (10) and washer (11) in order to remove drive pinion (12), the sleeve, and the spring from the end of the drive shaft.
Mark the position of drive housing (6) in relation to gear case (7) for assembly. Remove bolts (13) and drive housing (6) from gear case (7).
Illustration 6 g00538964
Remove O-ring seal (14) from drive housing (6).