Terex T25 - Troubleshooting Guide

Operating Instructions and Parts Manual
22 Terex T25I and T45I Super Quiet Generator
June 2006
REV A
TROUBLESHOOTING GUIDE
The engine/generator set is tested and set at the factory for proper operation in the field. These units
should never require additional adjustments in the field. If needed, adjustments should only be made by a
qualified service technician, otherwise the manufacturer’s warranty may become void.
FAULT POSSIBLE CAUSE SOLUTION
No generator output voltage Circuit breaker tripped Reset circuit breaker
Voltage regulator Check voltage regulator wiring
Defective voltage regulator Replace voltage regulator
Defective Selector Switch By pass by hardwiring generator
Defective generator Refer to generator manual
Low generator output voltage Voltage adjustment Adjust voltage potentiometer
set too low
Defective potentiometer By pass or replace
Low engine speed Call TEREX Service
Loose wire on voltage Check wiring
selector switch
Fluctuating or surging Check engine fuel, oil,
engine speed and air filters
Loose wire on voltage Check wiring
regulator sensing circuit
Defective voltage regulator Replace voltage regulator
High generator Voltage adjustment Adjust potentiometer
output voltage potentiometer
High engine speed Call TEREX Service