Onan MJA Series Service Manual page 35

33
A725
h \ WI'
WJ~-
-
SPRING
,!
FUEL SYSTEM
Under extreme temperature conditions,
it
may be necessary to readjust
the choke for best operation. For more chOking, turn the cover clock­
wise, for less choking, turn it counterclockwise.
3.2.4.2 Disassembly and Repair, Electric Choke. - If the choke does
not operate, or won't maintain its adjustment, disassemble it for re ­
pair. If it won't close, check for binding, incorrect adjustment, or
incorrect assembly of the coil. If it won't open after the plant starts,
check for heating. The choke should be warm to the touch within a
minute or 2 of plant starting.
To disassemble the choke, remove the 2 screws holding the cover and
lift the cover off. Then remove the spring. If necessary, remove the
choke housing by loosening the single clamp screw on the housing.
If the choke won't heat properly, check for a broken heating coil or
high resistance electrical connections. Check the coil resistance with
an ohmmeter. With the element at room temperature, resistance
should be about 5 - 6 ohms for 12 volt models and about 25 ohms for 24
volt mode Is.
If the
coil is defective, replace the thermostat cover.
The bi-metal spring must be installed as shown in Fig 3.2.F. If in ­
stalled backwards, it will hold the choke closed as the coil heats,
flooding the engine.
3.2.4. 3 Assembly, Electric Choke. ­
1. Install the choke housing, clamp
it
in place, and install the fiber ­
glass insulation
in
the housing.
2. Install the spring, Fig 3.2. F. Be sure it winds in the proper direc ­
tion - clockwise starting from the center.
3. Install the caver plate. Be sure the fork in the plate straddles and
holds the outer end of the coil.
FIG 3.2.F - INSTALLING COVER ON ELECTRIC CHOKE
INSERT INNER
END OF SPRING
IN SLOT IN
SHAFT
---!Iroo­
H HOOK
TER END
RINGIN
IN COVER
TAB
COVER