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 177. Motor-Generator Set
d.
Wiring. Check that all connections are tight.
Inspect the insulation for chafing or damage.
a. Motor. No maintenance required.
b.
178. Lubrication
maintenance procedures.
No lubrication required.
c. Voltage Regulator. Refer to TM 9-2920-209-35
for maintenance procedures.
Trouble
Probable Cause
Remedy
Heater fails to ignite
Ignition failure
Replace spark plug and/or adjust
contact points.
Preheater failure
Replace preheater.
Excessive carbon deposits in burner
Clean burner bowl.
Fuel system failure
Test and repair fuel system (para
181).
Electrical system failure
Test and repair electrical system (par.
2-18).
Preheater relay or power relay failure
Replace relay.
Flame switch failure
Replace flame switch.
Excessive time required for ignition
Low voltage
Test batteries for proper operating
voltage.
Fuel flow rate slow
Test and repair fuel system (para
181).
Heater starts but fails to keep burn-
Nonfire relay failure (fuel shuts off
Replace nonflre relay.
ing
shortly after ignition occurs)
Combustion chamber overheated (limit
Correct overheating. (Make sure air
switch stops operation)
blower is distributing combustion
air adequately.) Check for plugged
liquid circulating hoses or passages.
Reset limit switch.
Burner clogged
Clean Burner.
Vapor lock in fuel line
Prevent excessive heat near fuel line.
Electrical system failure
Test electrical system (para 180).
Timing or power relay failure
Replace relay.
Heater combustion surges
Fuel system not supplying steady or
Test and repair fuel system (para
proper flow
181).
Low combustion air blower motor
Replace motor.
speed
Low voltage
Test batteries for proper operating
voltage.
Heater smokes
Fuel system not supplying steady or
Test and repair fuel system (para
adequate flow
181).
Low combustion air blower motor
Replace motor.
speed
Low voltage
Test batteries for proper operating
voltage.
Heater fails to respond to "ON-HI"
Fuel regulator valve failure
Replace regulator valve.
and "ON-LO" switch operation
No warm liquid circulated (Liquid
Liquid circulating failure
Replace pump.
Heater)
Faulty thermoswitch
Replace thermoswitch.
No warm air distributed (Fresh Air
Circulating air blower failure
Replace blower motor.
Heater)
Faulty thermostat
Replace thermostat.
Figure 71.20. Troubleshooting chart
AGO 5667A
19
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