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Home›Repair guides›Ingersoll Rand›Assembly of the Motor

Ingersoll Rand — Assembly of the Motor

Repair & overhaul

From a Ingersoll Rand service manual — check it applies to your exact model before use.

Before you start

  • Tighten the Controller to 14 to 16 ft-lb (19.0 to 21.7 Nm) torque. Do not exceed 16 ft-lb. The Controller may be damaged if this torque is exceeded.
  • If the Controller Assembly (35) needs to be replaced, you must also replace the Rotor Bearing Seal Assembly (36). Do not mix old and new parts.
  • Always check the free speed of a Grinder after it has been reassembled and before it is put back into service.
  • Never use a Grinder which runs in excess of the maximum speed listed in the Test and Inspection Procedure.

Procedure

  1. Using an arbor press, press against the inner race of the bearing to install the Front Rotor Bearing (47) onto the Rotor Shaft (48).
  2. Inspect the Front End Plate (46) for nicks or burrs; replace if necessary and install over the Rotor Shaft.
  3. Hold the Rotor Shaft in a vise. Insert the Rotor Key (45) in the slot of the Rotor (43); place the counterbored end over the Rotor Shaft.
  4. Apply a light film of the recommended oil to each Vane (44) and insert one vane, straight edge out, into each rotor slot.
  5. Place the Cylinder (40) over the Rotor matching the End Plate Dowel (41) to the alignment hole.
  6. Align the Rear End Plate (39) with the Long Cylinder Dowel (42).
  7. Check the outside diameter and large inside diameter of the Rotor Bearing Seal for wear; install a new Rotor Bearing Seal Assembly if worn.
  8. Press the Rear Rotor Bearing (36) onto the hub of the Controller and press the Controller Assembly into the Bearing Cage (37) to within 1/8 inch of seating.
  9. Slip the Controller Assembly over the Rotor Shaft and rotate the Controller counterclockwise (left-hand thread).
  10. Install the Controller Retaining Nut. Tighten to 9 ft-lb (12.2 Nm) torque.
  11. Grasp the Throttle Handle Assembly (1) in a vise, wide end up with the Throttle Lever facing right, and insert the assembled motor aligning the Cylinder Dowel with the upper left-hand dowel pin hole.
  12. Lightly dampen the Arbor Housing Gasket (32) with oil and align it with the holes in the Throttle Handle Assembly.
  13. Insert the two Motor Clamp Washers (49) over the spline of the Rotor Shaft, concave side up.
  14. Place the Arbor Housing (29) onto the Throttle Handle Assembly so the notch lines up with the Cylinder Dowel.
  15. Place Lock Washers on the Arbor Housing Screws (30) and tighten all screws to 14 ft-lb (19 Nm) torque. Then install the Exhaust Baffle (26), Exhaust Diffuser (27), Exhaust Deflector (25) and Exhaust D

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Controller Assembly: 14 to 16 ft-lb (19.0 to 21.7 Nm), do not exceed 16 ft-lb
  • Controller Retaining Nut: 9 ft-lb (12.2 Nm)
  • Arbor Housing Screws: 14 ft-lb (19 Nm)
  • Exhaust Deflector Screws: 23 in-lb (2.6 Nm)

Source: Ingersoll Rand service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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