MALFUNCTION
23.
24.
25.
26.
27.
28.
Engine generator set
shuts down, HIGH
COOLANT TEMP
indicator illuminates
but coolant tempera-
ture is normal.
Engine generator set
shuts down, low oil
pressure indicator
illuminates, but oil
pressure is normal.
Engine generator set
shuts down, over -
speed indicator il-
luminates, but engine
speed is normal.
All meters read cor-
rectly except volt -
meter reads off scale
high.
Circuit breaker
switch is closed and
indicator does not
light.
Main AC contactor
(CB2) will not close.
Table 3-3. Troubleshooting (Cont)
PROBABLE CAUSE
Defective coolant
temperature switch.
Defective oil pressure
switch.
Defective overspeed
switch.
Defective voltage adjust
rheostat.
a.
b.
Defective load circuit
breaker switch.
Lamp burned out.
Main AC contactor (CB2)
defective.
CORRECTIVE ACTION
Replace switch (para 3-209).
Replace switch (para 3-194).
Replace switch (para 3-186).
Replace rheostat (para 3-110).
a.
Replace circuit breaker switch (para 3-117).
b.
Replace lamp (para 3-26).
Measure continuity of coil pins A and B. If no
continuity, replace contactor (para 3-141).
3-26
Change 8
