Cleaning, Inspection, and Repair.
Clean all parts in a well-ventilated
area. Avoid inhalation of solvent
fumes and prolonged exposure of
cleaning solvent (Fed. Spec. P-D-680
and P-S-661) used to clean parts is
potentially dangerous to personnel
and property. Do not use near open
flame or excessive heat. Flash point
of solvent is 1000 F(38°C).
Clean all parts with a cloth dampened in
cleaning solvent, Fed. Spec. P-D-680 or P-S-661, and
Inspect the ball bearing to be sure it moves
smoothly and quietly and for evidence of excessive wear.
Replace a noisy, loose, or worn ball bearing.
Inspect the rotor shaft at each end for
evidence of nicks, rust, or wear. Use a fine file to remove
rust, burrs, or fine ridges. Inspect the rotor assembly to
be sure all windings are properly pressed into the core
slots. Inspect the core for wear and replace a badly
scored or defective rotor assembly.
Inspect the field windings and leads for
damaged or broken wires. Inspect the main frame for
damage and broken welds and for nicks and burrs
around the mounting flanges.
Remove all the defective wiring that can be replaced
without disturbing the main field windings.
Inspect all hardware for defective threads.
Replace damaged or missing parts.
Inspect the wiring harness and plug
connector for defects and replace all defective parts.
If the bearing (13, fig. 8-1) is to be replaced
in the bearing unit housing (11) repair as follows:
Remove old sleeve or enlarge the
bracket bore by machining. Be sure to center the bore for
proper rotor alignment.
Fabricate a sleeve from a steel bar or
tubing, Federal Spec. QQ-S-633, or equal. Machine the
sleeve 0.0005 in. (0.0013 cm) larger than the bracket
bore to provide a press fit. The I. D. of the sleeve shall
be less than the bearing 0. D. to allow for final machining
after sleeve is installed.
Press sleeve into bracket.
Machine sleeve I. D. same as 0. D. Of
bearing, with a tolerance of 0.0005 in. (0.0013 cm).
The use of Loctite Sealant, NSN 8030-
00-964-7537, is permissible as an additional aid in
locking the bearing in the sleeve.
If the field windings and coils have been
replaced, follow the instructions listed below for
varnishing and baking:
Refer to figures 8-3 and 8-4 for