Onan MEP-003A - Page 52

TM5-6115-585-34
NAVFAC P - 8-262-12
TO - 35C2-3-455-2
TM
- 05684C
- 34
CHAPTER 5
MAINTENANCE OF STARTING SYSTEM
Section I. DESCRIPTION AND FUNCTION
5-1
.
GENERAL
.
The engine is cranked by a 24 volt starting motor
( see figure 5-1 ) . When the starting motor solenoid is
energized , the solenoid core pulls in , shifting the
pinion into engagement with the engine flywheel ring
gear . The starting motor is protected from over
speeding by engine by an overrunning clutch . At the
same time , contacts in the solenoid close to provide
a circuit for the starting motor . Two 12 volt batteries
in series are used . The starting switch for this start
ing circuit is located in the control cubicle . Refer to
the Operator and Organizational Maintenance
Manual for starting and operating the set . A blower
wheel alternator is utilized to recharge the batteries .
Section II . MAINTENANCE
5-2
.
STARTER
ASSEMBLY
.
assembly ( 29 ) from armature ( 27 ). Do not disassem
ble drive
assembly
.
a . Test , on Equipment . Refer to the Operator and
Organizational Maintenance Manual .
( 6 ) Remove bearing ( 30 ) by pressing from pinion
housing .
b
.
Removal
.
Refer
to
Operator
and
Organizational
Maintenance
Manual
.
d . Cleaning Inspection .
c . Disassembly ( see figure 5-1 ) .
( 1 ) Cleaning . Clean dust off parts with com
pressed air or soft brush . Remove grease and oil with
dry cleaning solvent .
( 1 ) Remove nut ( 1 ) and lockwasher ( 2 ) from sole
noid ( 9 ) . Tag and remove lead ( 3 ) . Remove nut and
lockwasher from solenoid and disconnect connector
and grommet ( 4 ) .
CAUTION
( 2 ) Remove cotter pin ( 5 ) and pin ( 6 ) from yoke
( 26 ) . Remove screws ( 7 ), lockwashers ( 8 ) and remove
solenoid
switch ( 9 ) .
Do not saturate armature or field coils with
solvent as wire insulation may be damaged .
Do not dip drive assembly in solvent as it is
packed in grease and cannot be repacked .
Remove discoloration or oxidation from commutator
with fine sand paper grade 00. Clean off sand with
compressed air . Use only sandpaper .
( 3 ) Remove through bolts ( 10 ) , lockwasher ( 11 )
and remove back plate assembly ( 12 ) and thrust
washer ( 21 ) . Remove nuts and washers from brush
terminal ( 15 ) . Raise brush spring ( 14 ) and lift brushes
( 15 ) from brush holder .
Remove screws
( 16 ) , lock
washers ( 17 ) and remove brush holder ( 18 ) . Raise
springs ( 14 ) and lift other brushes from brush holder .
Remove springs ( 14 ) from brush holder .
( 4 ) Remove retainer ( 23 ) , boot ( 24 ) , pin ( 25 ) and
separate pinion housing ( 22 ) and frame assembly ( 19 ) .
Do not lose thrust washer ( 21 ) . Remove other set of
brushes ( 20 ) by cutting leads one inch on each side of
welded connection
( see figure 5-9 ) .
( 2 ) Bearings . Inspect bearings ( 30 , figure 5-1 )
for wear . Replace if excessively worn . Inspect bear
ing in back plate assembly ( 12 ) . If excessively worn
replace back plate assembly .
(
3
)
Drive
Assembly
.
Refer
to
Operator
and
Organizational
Maintenance
Manual
.
( 4 )
Brushes
. Refer
to
Operator
and
Organizational
Maintenance
Manual
.
( 5 ) Remove yoke ( 26 ) and remove armature ( 27 )
and drive assembly ( 29 ) . Remove lock ring and stop
( 28 ) by pressing stop toward armature until lock ring
becomes accessable . Remove lock ring ( 28 ) and drive
( 5 ) Solenoid Switch . Refer to Operator and
Organizational Maintenance Manual .
5-1