Engine Tune-Up
MECHANICAL OUTPUT SHAFT GOVERNOR AND LINKAGE ADJUSTMENT
plug is installed in the oil level hole to prevent
A Pierce mechanical governor is used to maintain a
leakage. The oil level should be checked every 8
near constant output shaft speed on engines equipped
service hours and changed every 500 hours.
with a torque converter. The governor is mounted at
the front of the engine (Fig. 1) and driven by a
flexible shaft from the converter output shaft.
The output shaft governor is connected to the engine
governor by control rods and levers as illustrated in
Fig. 1. The control rod end ball joints are sealed
The output shaft governor is lubricated by engine oil
assemblies and do not require lubrication. Other
contained within the governor housing. The governor
moving parts of the control linkage should be
sump is filled through the hinged cap oiler until the oil
lubricated with engine oil.
begins to drip out of the oil level hole. After filling, a
1.
Governor--Engine
Governor
13. Spring--Governor Lever
18. Lever--Spring
2.
Governor--Output Shaft
8. Pin--Stop
Return
19. Eyebolt--Droop
3.
Lever--Throttle Control
9. Spring--Torsion
14. Bolt--Minimum Speed
Adjusting
4.
Lever--Shutdown
10. Bolt (Stop)
Adjusting
20. Spring--Speed
Ad.usting
j
15. Bolt--Maximum Speed
-
5. Lever--Engine Governor
11. Lever--Output Shaft
Adjusting
21. Drive--Tachometer
Operating
Governor
22. Bracket--Output Shaft
16. Lever--Rocker Shaft
7. Rod--Output Shaft
12. Drive--Flexible Shaft
17. Lever--Speed Adjusting
Governor Mounting
Fig. 1 - Mechanical Output Shaft Governor and Linkage
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