Allmand — D.C. Motors (Permanent Magnet)
Repair & overhaul · D.C. motor (permanent magnet)
From a Allmand service manual covering: M-250 Series, M-258, M-259, M-301, M-303, M-304, M-310, M-311, M-313, M-314, M-319, M-326…. Check it applies to your exact model before use.
Before you start
- Magnets will pull the armature into the motor upon reinsertion.
- Keep fingers away from area between armature and motor case when re-installing armature.
Procedure
- Brush holder mounted to head assembly must be aligned with timing marks to motor shell.
- Make your own marks before loosening bolts if marks cannot be found.
- Repair similar to wound field motor except field coils are replaced with permanent magnets.
- Handle with care; timing marks must be properly aligned.
- Keep magnets clean before inserting armature.
Source: Allmand 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.