Onan DJA Series User Manual

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
o
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 it 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 cut-off 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° F. When it opens, the
solenoid is de-energized, stopping the unit. The
switch closes again at about 195
0
F.
LATE MODELS
UPPER SHUTTER
ACTUATING ROD
SHUTTERS
EARLY MODELS
SHUTTER
ACTUATING
ADJUST THE VERNATHERM
POWER ELEMENT TO REST
ON THE ROLL PIN WITH
SHUTTER CLOSED AT AMBIENT
TEMPERATURE
VERNATHERM
POWER ELEMENT
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
15

Onan DJA Series Specifications

General

Brand	Onan
Model	DJA Series
Category	Engine
Language	English