Hobart 60PL20 Operation And Maintenance Manual page 90

OM-2053
TROUBLE, SYMPTOM
AND CONDITION
ENGINE AND CONTROLS (CONTINUED)
9. Engine is unsteady
(surges) under load
10. Engine has slow
response time
11. Engine "misses".
Runs unevenly.
3-1
Page 12
PROBABLE CAUSE
A. Fault in engine
B. Governor system
faulty or misadjusted
(1) Loose or binding
governor linkage
(2) GAIN and STABILITY
controls improperly
adjusted (Woodward
controller)
(2A) GAIN control im-
properly adjusted (Barber-
Colman controller)
(3) Magnetic pickup
signal weak
A. Governor controller
improperly adjusted
B. Actuator linkage binding
C. Engine needs tune-up
A. Insufficient fuel
B. Fault injector
C. Low compression
pressure
TEST, CHECK, AND/OR
REMEDY
A. Before condemning the gover-
nor system for surging, make
certain the fault is not in
the engine. Make certain all
cylinders are firing properly.
B. Check and adjust as follows:
(1) 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.
(2) Adjust GAIN and STABILITY
controls on controller in accordance
with Section 2-3, Para. 4, E, (4).
(2) Adjust GAIN and STABILITY
controls on controller in accordance
with Section 2-3, Para. 4, F, (4).
(3) Check and adjust pickup as per
Section 2-3, Para. 4, E, (3) for
ungrounded magnetic pickup or
Para. 4, F, (3) for grounded
magnetic pickup.
A. Adjust. See 2-3; Para. 4, E, (4).
B. Inspect and repair as required.
C. Tune-up as required. Refer
to Perkins Handbook
A. Check fuel flow in accordance
with Perkins Diesel Handbook.
Repair or replace parts as required.
Also see Engine, Trouble 3.
B. Check injectors in accordance
dance with Perkins Handbook.
See causes of low compression
listed under ENGINE, Trouble 4, B,
above.
C. Check compression in accor-
dance with Perkins Diesel
Handbook. See causes of low
compression listed under
ENGINE, Trouble 4, B, above.
December 31/91 Revised