Repairing Armature

If armature commutator is worn, dirty, out of round or has high mica insulation between segments, commutator can be turned down in a lathe. Mica should then be undercut 1/32 in. deep with an undercutting machine and slots cleaned out to remove dirt or copper dust. Ii undercutting machine is not available, undercutting can be accomplished satisfactorily using a hacksaw blade. (See Fig. 5E-6, page 5E-5 for recessing mica separators.) Commutator should then be sanded lightly with No. 00 sandpaper to remove any burrs left from undercutting procedure.

Armature test procedure is described in Section 5E, or see Delco-Remy service bulletin No. 1M-152.

Inspect bushings (Item 21, Fig. 5L-8 and 5L-9) ill drive end and commutator end frames, and commutator end thrust washer (22). Replace any excessively worn parts. Inspect bearing (23) in 4-pole type and replace if worn to excessive looseness.

Remove pole shoe screws (7), terminals nuts, lockwashers and insulating washers (8) and terminal screw (9). Remove set of field coils with brush (10) and pole shoes (11). It is unnecessary to remove brush holders (12) except when defective or when replacing grounded brushes (13). Remove by cuttingoff or drilling out rivets. Replacement brushes are complete with screws (14), washers, and nuts (15) for attaching to frame. To remove brush springs (16), compress one side of spring with a small screw driver until it flips out of its seat. Then turn spring clockwise until it comes out of holder. Replacement insulated brush holder set (17) is available with insulator (18) and attaching hardware. Grounded replacement brush holder set (19) includes grounded brushes (13) and Insulated brushes (20) with necessary attaching hardware.

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