Cummins/Onan — Westinghouse Transfer Switch (800 and 1200 Ampere) Motor Mechanism Removal
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Remove the two flat head screws attaching the handle.
- Pull off the handle assembly.
- Remove the nuts with a 3/4-inch wrench, remove other attaching parts and pull off the motor mechanism and mounting plate as a unit; remove four screws from cover and remove cover.
- Check the auxiliary switches with an ohmmeter; if no continuity or more than one ohm resistance drop or other evidence of burning, replace the assembly.
- Reassemble in the reverse order, checking the gap between the handle assembly and the crank; if not 1/16 inch at all positions, loosen the two screws, readjust the handle, and retighten.
- Remove the spring clip and plate at the end of the motor housing and rotate the motor shaft in the indicated direction as a manual check before electrical operation is attempted; replace the spring cl
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Gap between handle assembly and crank must be 1/16 inch at all positions of the handle
- Auxiliary switches: no continuity or more than one ohm resistance drop indicates replacement
Source: Cummins/Onan 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.