Hobart 6921 Series Operation And Maintenance Manual page 108

OM-2040 / Operation and Maintenance Manual
90D20 / Generator Sets
Engine and Controls (cont.)
Trouble, Symptom & Condition
9. Engine has slow response time.
10. Engine "misses". Runs
unevenly.
11. Engine lacks power.
Chapter 3-1
Page 16
Test or Inspection
d. c. Loose or binding governor
linkage.
e. GAIN and STABILITY
controls improperly
adjusted.
f. Magnetic pickup signal
weak.
a. Governor control unit
improperly adjusted.
b. Actuator linkage binding.
c. Engine needs tune-up.
a. Insufficient fuel.
b. Faulty injector.
c. Low compression pressure.
a. Improper engine
adjustment and gear train
timing.
b. Insufficient fuel.
c. Insufficient inlet air.
d. Damaged air cleaner.
e. Defective blower to-cylinder
block gasket
f. Plugged cylinder liner ports.
g. Faulty air blower.
h. Worn Engine.
Corrective Action
Check linkage ball joints and all
connections for looseness or
binding. Be sure linkage will
move from idle speed to full
speed without lost motion or
binding.
Adjust GAIN and STABILITY
controls on control unit in accor-
dance with 2-3; Para. 4, E, (3).
Check and adjust pickup. See
2-3, Para. 3, E, (2).
Adjust. See 2-3; Para. 3, E, (3).
Inspect and repair as required.
Tune up as required. Refer to
Detroit Diesel Operator's
Manual.
Check fuel flow in accordance
with Para. 9, F. Repair or
replace parts as required. Also
see ENGINE, Trouble 3.
Check injectors in accordance
with Para. 9, B.
Check compression in accor-
dance with Para. 9, C. See
causes of low compression
listed under ENGINE, Trouble
3, B, above.
"Tune-up" the engine in
accordance with Detroit Diesel
Operator's Manual.
See ENGINE, Trouble 3.
Check as follows:
Check air cleaner for "plugging"
and/or other damage.
Replace the gasket if
necessary. If the blower is
removed, install a new gasket.
Clean ports if they are over
50% obstructed.
Repair or replace.
See engine overhaul
instructions in engine manual.
February 28/94 Revised