Onan DJA Series User Manual

LATE MODELS
EARLY MODELS
SHUTTERS.
• • m
ADJUST THE VERNATHERM
POWER ELEMENT TO REST
ON THE ROLL PIN WITH
SHUTTER CLOSED AT AMBIENT
" ••" TEMPERATURE
LOWER SHUTTER
ACTUATING ROD
ADJUST THE VERNATHERM
POWER ELEMENT TO REST
ON THE ROLL PIN WITH
SHUTTER CLOSED AT AMBIENT
TEMPERATURE
VERNATHERM BRACKET
ADJUSTING AND MOUNTING
SCREWS IN SLOTTED HOLES
FIGURE 10. AIR SHUTTER
Repair: If the shutter will not open, check the power
element for defects or binding of the plunger. Be sure
the shutter does not bind against the housing in any
position.
To test the power element, remove it from the assembly
and heat it. When the unit reaches about 120
0
F, the
plunger should start to move out. Total movement
should be at least 1/5-inch. Do not overheat.
If the unit will not close, check for a weak return
spring, binding in the nylon bearings or dirt in the
power element plunger. If the nylon bearings are worn
or bind, replace them. Remove the shutters and pull
out the stub shaft. Push out the old and push in new
bearings from the inside of the shutter housing. The
large bearing surface serves as a spacer bushing so
must be on the inside of the housing. The shutters
should be adjusted to obtain an end thrust clearance
of not more than 1/32-inch.
HIGH TEMPERATURE CUT-OFF
When optional automatic air discharge shutter is used,
it is recommended that the shutter include a high
temperature cutoff switch. This switch protects
the engine if shutter fails to open. The switch is in
series with the governor solenoid. Switch is normally
closed and opens at about 240
0
F. When it opens, the
solenoid is de-energized, stopping the unit. The switch
closes again at about 195
0
F.
15

Onan DJA Series Specifications

General

Brand	Onan
Model	DJA Series
Category	Engine
Language	English