Section 4 • Troubleshooting
September 2008
Part No. 134277
T70, T90 & T120 Super Quiet Generator
4 - 3
TROUBLESHOOTING
FAULT
POSSIBLE CAUSE
SOLUTION
High generator
Defective automatic
Replace voltage
output voltage
voltage regulator
regulator
Loose wire on voltage
Check wiring
adjustment potentiometer
Neutral binding strap
Install neutral binding strap
not in place.
Fluctuating generator
An “ON/OFF” type
Redistribute load if
output voltage
load may be the cause
possible
Fluctuating or surging
Check engine fuel, oil,
engine speed
and air filters
Loose wiring in generator
Check connections
Automatic voltage regulator
Call TEREX Service
stability setting may be
wrong
Loose wire on the automatic
Check wiring
voltage regulator sensing lead
Low engine speed
Engine speed adjustment
Call TEREX Service
has slipped
Clogged fuel system
Check for air leaks, clogged fuel
filter, kinked fuel line, or
clogged fuel pick-up tube
Blocked air intake
Check air filter
Blocked exhaust system
Check engine exhaust
system, remove
obstructions
Contaminated fuel
Check fuel/water separator and
fuel tank for contamination.
Replace fuel if needed
Defective governor on engine
Call TEREX Service
