Onan MJA Series Service Manual page 73

71
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STARTING SYSTEM
the pinion into full mesh and measure the clearance between pinion and
pinion stop, Fig 3. 6. D. This should be between. 07" and . 12" (as aear
. 07" as possible). Adjust the link screw on the end of the solenoid
plunger for proper clearance.
NOTE: On plants built before March, 1962, it was necessary to main ­
tain the gap between ring gear and starter pinion in the re­
1axed pOSition at less than 1/8" to insure starter engagement.
When installing these motors, check this gap.
If it
is too great,
a shim kit is available to reduce it, (Fig 3.6.E),
TROUBLE-SHOOTING CHART 7, STARTING SYSTEM
TROUBLE
POSSIBLE CAUSE
REMEDY
Starter motor
Grounded switch, terminal,
Replace any grounded
doesn't turn -
or fields
component.
high current draw
Frozen shaft bushings.
Replace bushings,
check armature shaft.
Starting _ motor
Defective control circuit.
See Sect 6
doesn't turn ­
no draw current
Open armature coils.
Replace armature .
Open field circuit.
Replace field coils.
Broken or weakened
Install new brush
brush springs.
springs.
High mica, worn brushes.
Refinish commutator,
replace brushes.
Open solenoid.
Replace ..
)
Slow starter
speed
Discharged battery.
Recharge battery.
Defective battery.
Replace battery,
check cause for failurE
High resistance in
starting circuit.
Dirty commutator.
Poor brush contact.
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Clean and retighten
all connections.
Clean or refinish
commutator.
Reseat or replace
brushes.