Ingersoll Rand — Disassembly of the Motor

A Ingersoll Rand service procedure — check it applies to your exact model before use.

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Procedure

1. Remove assembled motor and Motor Housing from vise jaws and using a plastic hammer, tap splined shaft of Rotor (22) to dislodge Rotor from Front Rotor Bearing (25).
2. Lift Motor Housing (26) off Rotor, Rear End Plate (20) and Rear Rotor Bearing (18) which will remain together as a unit.
3. Remove Vanes (23) from Rotor.
4. Pull Rear End Plate off Rotor.
5. Open a set of vise jaws wide enough to clear hub of Rear End Plate and sharply rap hub end of end plate on top of jaws to dislodge Rear Rotor Bearing.
6. Remove Cylinder Dowel (19).
7. For 3940 and 3942 Series: To remove Cylinder (21) and Front End Plate (24), thread four 1/4"-20 thread socket head cap screws that are at least 3" (75 mm) long into handle end of Housing. Grasping Housing with installed screws downward, sharply strike heads of screws on a sturdy table to dislodge Cylinder.
8. For 3955 Series: To remove Cylinder (21) and Front End Plate (24), thread four 5/16"-18 thread socket head cap screws that are at least 3" (75 mm) long into handle end of Housing. Grasping Housing with installed screws downward, sharply strike heads of screws on a sturdy table to dislodge Cylinder.
9. Open a set of vise jaws wide enough to clear hub of Front End Plate and sharply rap hub end of end plate on top of jaws to dislodge Front Rotor Bearing.
10. Remove two Air Port Gaskets (29) and Air Port Gasket Retainers (28) from Housing.

Source: manual:10569408ed2b.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.