TROUBLESHOOTING
TESTING AND ADJUSTING
10a. ENGINE SPEED DOES NOT HAVE STABILITY
Cause
Correction
Compensation Needle Valve
Adjust the needle valve.
Opened Too Far
Bad Lubrication Oil
Remove, drain and clean the governor. Make
sure air is not held inthe oil supply. Change the
oil and make a replacement of the filter.
Fuel Control Linkage Worn or
Inspect and adjust the fuel control linkage.
Not Correctly Adjusted
Make repairs as necessary.
Engine Fuel System Has a Failure
Use the FUEL SYSTEM section in TESTING
AND ADJUSTING as a reference. Make
repairs as necessary.
Negative Droop Set into Gover
Adjust droop setting.
nor
Oil Does Not Drain Correctly
Make sure governor drain passages have no
From the Governor
restrictions.
Buffer Springs Have a Failure
Make a replacement of the buffer springs.
Governor Parts Worn
Diassemble and inspect pilot valve, power
piston, flyweight pins, pin bearings, flyweight
toes,
flyweight
head
thrust
bearing
and
centering bearing. Operation of all parts should
be
smooth
and
free.
Make
repairs
as
necessary.
Pilot Valve Not Correctly Adjust-
Adjust the pilot valve.
ed
10b. VIBRATION AT GOVERNOR OUTPUT SHAFT
Cause
Correction
Rough Governor Drive
Inspect the gear drive. Make repairs as
necessary.
Spring Driven Flyweight Head
Clean and inspect flyweight head. Make
Has a Failure
repairs as necessary.
Gear Drive Not in Correct Align-
Make sure governor is installed correctly.
ment
49
