CLEANING -832450491

TM 10-3930-660-24-2

STARTER ASSEMBLY MAINTENANCE (152 HP) - CONTINUED

0286 00

CLEANING

NOTE

For general cleaning instructions, see WP 0316 00.

CAUTION

Do not clean starter parts in solvent cleaning compound, which may damage certain electrical parts.

WARNING

Particles blown by compressed air are hazardous. DO NOT exceed 15 psi (103 kPa) nozzle pressure when

drying parts with compressed air. Use a maximum of 30 psi (207 kPa) when cleaning components. DO NOT

direct compressed air against human skin. Failure to follow this warning may cause injury or death. Make

sure air stream is directed away from user and other personnel in the area. To prevent injury, user must wear

protective goggles or face shield.

Clean starter parts in mineral spirits and dry using low pressure compressed air or clean lint-free cloth.

INSPECTION

Check brush (19) lengths against length of new brush. Brushes that are less than two-thirds the length of a new brush

must be replaced.

NOTE

An oil-soaked brush must be replaced.

Check to ensure that brushes fit well in holders (13 and 14), but without binding.

Inspect brush springs (15) for distortion or discoloration.

CAUTION

Do not turn commutator nor undercut insulation between commutator bars. Replace armature if commutator

cannot be restored satisfactorily.

NOTE

Check condition of commutator, and clean, if necessary, using emery paper.

Check for short circuits in armature using a growler and steel strip.

Rotate armature in growler.

Hold steel strip (e.g., hacksaw blade) across armature slots as armature rotates. Steel strip will vibrate as slot between

shorted bars passes under steel strip.

If short circuit is detected, check for build up of copper dust or other conductive material between commutator bars.

Check armature for grounds or open circuits, by mea-

suring resistance between commutator (A) and one

armature bar (B). Set ohmmeter on highest scale when

taking measurement.

Switch ohmmeter to lowest scale, and place ohmmeter

leads against two adjacent commutator bars (A) and

observe ohmmeter. Ohmmeter needle should swing to

409-1110

zero and remain.

0286 00-3