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 TM 55-1905-217-34
(5) Remove the front bearing (11) from the rotor shaft with a bearing puller.
(6) Remove the grease seal (10), front bearing retainer gasket (12) and retainer (13) from the rotor
shaft.
(7) Remove the slip ring assembly (17) as follows:
NOTE
The slip ring assembly requires replacement only if the rings are worn or damaged
beyond use of if the rear bearing is to be replaced.
(a) Remove cap screw (19) and lockwasher (18) from the end of the shaft.
(b) Unsolder two connections on the slip ring assembly using care not to damage the fiber washer
between the rings or damage the wires.
(c) Slide slip ring assembly from end of shaft.
(8) Remove rear bearing (16) from shaft with bearing puller after removing the slip assembly.
i. Cleaning, Inspection, Repair and Testing (Hulls 8500-8519 and 8520-8539).
(1) Wipe grease seals with a clean cloth to remove foreign matter and lubricant.
CAUTION
Do not soak a grease seal in cleaning solvent to clean.
(2) Inspect seals for damage and replace if necessary. Repack seals if necessary to 2/3 full with a
suitable ball bearing grease.
CAUTION
Do not overpack grease seals. Excess lubricant in alternator may flow into
electrical parts and cause malfunction.
(3) Clean ball bearings in solvent (FED. SPEC. PD-680) to remove dirt and old lubricant. Do not spin
ball bearings or use compressed air to dry bearings after cleaning. Allow bearings to air dry. Place a small
quantity of grease on a clean flat surface. Press bearing into lubricant until grease starts to flow through to
opposite side of bearing. Wipe off excess grease from sides and outside of bearings with a clean cloth.
CAUTION
Do not overpack ball bearings. Excess lubricant in alternator may flow into
electrical parts and cause malfunction.
(4) Clean metal parts in approved cleaning solvent. Inspect parts for damage. Replace all defective
parts.
(5) Wipe off stator and rotor windings with a clean cloth.
CAUTION
Do not use compressed air hose on rotor or stator windings. Undetectable
flaws may be created making assembly less than acceptable.
(6) Perform tests on electrical components using a suitable ohmmeter or multimeter.
(a) Check for short circuit between each stator lead and frame (fig. 4-4). Connect ohmmeter
between each stator lead (1, 2, or 3) and stator frame (4) in turn. Ohmmeter should indicate open circuit or
very high resistance. Stator assembly shall be replaced if winding(s) are shorted (no or low resistance).
4-7
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