Generac Power Systems GTH1000, Service Manual

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4-1
SECTION 4: GOVERNOR CONTROLS AND GOVERNOR
MECHANICAL GOVERNOR
DISASSEMBLE:
1. Drain the oil from the engine.
2. Remove any rust, nicks, or burrs from the crankshaft.
3. Remove the four (4) oil cooler screws.
4. Disconnect the wiring from the oil pressure switch.
5. Remove the governor lever from the shaft.
6. Separate the ball joint on the swinging arm.
7. Remove all of the crankcase bolts and slide the crankcase
cover off.
8. Discard the crankcase gasket & oil passage o-ring.
GOVERNOR
Both the spool and the flyweights must move freely for the governor
to work properly. Check for wear on the spool and flyweights. If
wear is noticed, change the governor gear assembly (gear and fly-
weights), spool, and governor arm. Lubricate all moving parts when
reassembling.
GOVERNOR REMOVAL AND INSTALLATION:
1. Leverage gear assembly and governor spool off of governor
shaft.
GOVERNOR GEAR ASSEMBLY
GOVERNOR
SPOOL
OIL
PASSAGE
O-RING
Figure 4-1. Governor Gear Assembly and Spool
2. Remove any remaining plastic from the notch in the governor
shaft.
3. Check that all the governor bearing parts (top plate, bearing,
and bottom plate) are on the shaft, and that it moves smoothly.
(See Figure 4-2)
4. Slide the new gear assembly and spool onto the governor shaft.
Slide until the gear hooks into the notch in the governor shaft.
(See Figure 4-2)
SPOOL
GOVERNOR SHAFT
ROLLER BEARING PLATES
ROLLER BEARING
GOVERNOR GEAR AND
FLYWEIGHT ASSEMBLY
GOVERNOR ASSEMBLY
SPOOL MUST ENGAGE UNDER BOTH FLYWEIGHTS
CUPPED SIDE OF BEARING FACES DOWN
AWAY FROM GEAR
PRESS THIS END INTO BLOCK
(37 mm / 1.456” EXPOSED SHAFT)
37 mm
Figure 4-2. Governor Assembly and Components
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