Hobart 120CU20, Operation And Maintenance Manual With Illustrated Parts List

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OM-2228 / Operation and Maintenance Manual
120CU20 / Series 500120 / 400 Hz. Generator Set
October 15, 2013 Chapter 2-4
Page 12
Trouble, Symptom, Condition Probable Cause Test, Check, and/or Remedy
Engine Controls (continued)
6. Engine starts but
then stops after a
few seconds by
automatic shutdown. a. Shutdown circuit may
have functioned normally
to stop engine because
of low lubricating oil
pressure or due to a
defective oil pressure
switch.
Restart the engine and observe oil pressure gauge.
If oil pressure is 12 psi or more, disconnect wire
from oil pressure switch terminal N.C. Restart
engine. If engine continues to run, oil pressure
switch is defective. Replace oil pressure switch. If
engine stops, check for following malfunctions:
b. Defective EIB board. Replace EIB board.
7. All panel and
clearance lights are
either always ON or
always OFF. a. Marker light circuit
breaker (CB1) won’t
close.
Replace marker lights circuit breaker (CB1) if
defective.
b. Defective CTL board. Replace CTL board.
8. Engine either goes
from rated speed to
idle speed, or shuts
down. a. Low fuel was detected
or the EIB board could
be defective.
Add No. 2 diesel fuel.
Replace EIB board.
9. Engine has slow
response time. a. Engine needs tune-up. Tune-up as required. Refer to engine
manufacturer’s operation manual.
10. Engine “misses” or
runs unevenly.
a. Insufficient fuel.
Check low fuel level in accordance with engine
manufacturer’s operation manual. Repair or replace
parts as required.
b. Faulty injector.
Check injectors in accordance with engine
manufacturer’s operation manual. See causes of
low compression listed under ENGINE CONTROLS.
c. Low compression
pressure.
Check compression in accordance with engine
manufacturer’s operation manual. See causes of
low compression listed under ENGINE CONTROLS.
d. Air in fuel system. Check all fittings to be sure they are tight and the
thread sealant is still present. Tight the fittings and
add new thread sealant as required.
11. Engine lacks power a. Improper engine
adjustments and gear
train timing.
“Tune-up” engine in accordance with engine
manufacturer’s operation manual.
b. Insufficient fuel. Check low fuel level in accordance with engine
manufacturer’s operation manual. Repair or replace
parts as required.
c. Insufficient inlet air due
to damaged or dirty air
cleaner.
Check air cleaner for “plugging” and/or damage.
d. Restricted exhaust
system.
Check exhaust pipes for restrictions. Check muffler
for clogged condition. Replace as required.