Onan DJA Series User Manual

STARTING SYSTEM
These engines use a separate 12-volt starting motor
(Figure 29) mounted on the right hand side of the
engine, to drive the flywheel. It is a standard automo-
tive starting motor with solenoid for engaging the pinion
and an overrunning clutch. When the solenoid is ener-
gized, its core pulls in, shifting the pinion into engage-
ment with the flywheel ring gear. At the same time,
contacts in the solenoid close to provide a circuit for
the starter motor. The starting motor remains engaged
until the starting switch is released by operator. The
starter is protected from over-speed by an overrunning
clutch which permits the engine to run faster than the
starter before the pinion is disengaged.
IMPORTANT: Onan does not stock parts for 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 hydro-
meter. 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
propei level. If battery will not recharge, replace it.
Keep battery connections tight and clean.
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, voltage drop should be less than 2volts. If
extra long battery cables are used, slightly higher
voltage drops may result. Thoroughly clean all con-
nections in any part of the circuit showing excessively
high voltage drops.
GEAR HOUSING
PINION
GROUND
CONNECTION
TO ENGINE
-END COVER
TO START
SOLENOID IN
CONTROL BOX
/
SHIFT LEVER
SHIFT LEVER,
LINK SCREW
COMMUTATOR
BRUSH
•ARMATURE
SHIFTING
SOLENOID-
SOLENOID
PLUNGER
1
BATTERY
FIGURE 29. STARTING SYSTEM
28

Onan DJA Series Specifications

General

Brand	Onan
Model	DJA Series
Category	Engine
Language	English