Onan DJA Series User Manual

STARTING MOTOR
These engines use a separate 12-volt starting motor (Fig. 9-
1), mounted on the right hand side of the engine, to drive
the flywheel. It is a standard automotive starting motor with
solenoid for engaging the pinion and an over-running clutch.
When the solenoid is energized, its' core pulls in, shifting the
pinion into engagement with the flywheel ring gear. At the
same time, contacts in the solenoid close to provide a cir-
cuit for the starter motor. The starting motor remains engaged
until the starting switch is released by operator. The starter
is protected from ovei^speed by an over-pinning clutch which
permits the engine to run faster than the starter, before the
pinion is disengaged.
Important: Onan does nof stock parts ior the starting motor.
See an authorized dealer.
MAINTENANCE
Periodically check the starting circuit wiring for loose or
dirty connections. Inspect the starter commutator and if
it is dirty, clean with #00 sandpaper (do not use emery
cloth or emery paper). Check the brushes for poor seating
on the commutator and for excessive wear.
TESTING
Poor cranking performance can be caused by a faulty
starting motor, defective battery or high resistance in the
starting circuit.
Check the charge condition of the battery with a hydrometer.
Specific gravity should be between 1.290 and 1.225. If not,
recharge the battery. Check electrolyte level. Add distilled
water to keep electrolyte at its' proper level. If battery will
not recharge, replace it. Keep battery connections tight and
clean.
' i
With the starting motor operating, check voltage drops from:
(1) the battery ground terminal post (not the cable clamp) to
the cylinder block (2) the cylinder block to the starting motor
frame and (3) the battery positive (+) post to the battery
terminal stud on the solenoid. Normally, each of these should
be less than 2: volts. If extra long battery cables are used,
slightly higher voltage drops may result. Thoroughly clean
all connections in any part of the circuit showing excessively
high voltage drops.
If starting motor tests are required, remove the motor from
the engine and test it on a bench. Test the free running volt-
GEAR HOUSING
PINION
FIELD COIL
POLE SHOE
GROUND
CONNECTION
TO ENGINE
-END COVER
TO START
SOLENOID IN
CONTROL BOX
/
SHIFT LEVER
LINK SCREW
COMMUTATOR
BRUSH
•ARMATURE
A936
SHIFTING
SOLENOID-
ENOID
PLUNGER
FIG. 9-1
23
BATTERY

Onan DJA Series Specifications

General

Brand	Onan
Model	DJA Series
Category	Engine
Language	English