Governor Mechanism Operation; Governor Inspection - Toro Groundsmaster 300 Series Service Manual

Governor Mechanism Operation

Operation of the governor keeps the engine speed
constant as the centrifugal force acting on the governor
weights balances with the tension of the governor
spring.
As the engine speed increases the governor weights will
open, forcing the end of the sliding shaft against the
governor lever. The governor lever then moves against
the governor spring tension and moves the control rack,

Governor Inspection (

A governor failure can result in a starting failure loss of
engine speed control, or engine surging (hunting). Be-
fore removal and disassembly of the engine the follow-
ing inspections are recommended:
1. Remove the tie rod cover and operate the speed
control lever. The injection pump control rack should
move as the lever is operated.
2. If the control rack does not move, remove the tie rod
retaining spring and tie rod from the control rack. The
control rack should now move freely when operated by
hand. If it does not, difficulty with the injection pump
should be suspected.
3. With the tie rod removed from the control rack,
operate the speed control lever and watch for tie rod
travel. Failure of the tie rod to move would indicate
difficulty with the governor spring, governor lever or
other internal parts. Refer to "Removing and Replacing
the Engine" for engine removal instructions.
®
Groundsmaster 300 Series
(Fig. 40)
Engine Not Removed)
Page 4 - 37
through the tie rod, in the direction that decreases the
amount of fuel delivered by the injection pump. A leaf
spring on the tie rod cover is used to prevent stalling
during rapid deceleration by limiting the travel of the tie
rod.
Servicing the governor requires removal of the gear
case on the front of the engine, and there for engine
removal.
Figure 40
1. Injection pump 6. Sliding shaft
2. Stopper spring 7. Gear case
3. Tie rod 8. Governor shaft
4. Governor lever 9. Pump gear
5. Governor weight 10. Pump camshaft
11. Idle gear
12. Needle bearing
13. Needle bearing
14. Governor spring
15. Speed control lever
Fuel System Service