Generac Power Systems GTH1000, Service Manual

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4-3
SECTION 4: GOVERNOR CONTROLS AND GOVERNOR
3. Put a new gasket on the crankcase.
Note: On vertical shaft engines, align the camshaft drive and oil
pump gerotor.
4. Slide the crankcase cover back on the crankcase.
Note: Hold the governor arm in the counter-clockwise position
while installing.
5. Start all of the crankcase bolts, and then torque them to 47.5 Nm
(35 ft. lbs.), following the proper torque sequence (see Figure
4-4).
6. Reconnect the ball joint on the swing arm.
7. Place the governor lever on the governor arm. Place the governor
spring in the 4th hole out.
8. Perform a static governor adjustment (see below).
9. Reconnect the wires to the oil pressure switch.
10. Reattach the oil cooler to the blower housing.
STATIC GOVERNOR ADJUSTMENT
Determine which version of governor linkage is installed on the engine.
Refer to Figures 4-5 (earlier version) and 4-6 (later version).
1. Loosen the clinching screw on the governor lever.
2. Rotate the governor arm clockwise and hold governor lever in
WOT (Wide Open Throttle) position.
3. While holding this position, torque the clinching screw to 11.3
Nm (100 in. lbs.).
4. Check to make sure that the throttle travels from WOT to IDLE. If
it doesn't, the governor needs to be reset again.
CLINCHING
SCREW
IDLE
W
O
T
Figure 4-5. Static Governor Adjustment
GOVERNOR
ARM
GOVERNOR LEVER
CLINCHING BOLT
Figure 4-6. Static Governor Adjustment (Later Version)
Figure 4-7. Dynamic Governor Adjustment (Earlier Version)
DYNAMIC GOVERNOR ADJUSTMENT
1. Start engine and allow to warm up for 5 minutes.
2. Move speed control lever to slow speed position and hold throttle
lever against idle stop screw (see Figure 4-7).
3. Adjust stop screw to maintain 1800 RPM idle.
4. Slowly move speed control lever to high-speed position. Do
not exceed 3800 RPM (see Figures 4-7 or 4-10 depending on
governor version).
Note: On the later governor version, insert an allen wrench or
similar object into the hole in the control panel behind the speed
control lever. This acts as a temporary stop during adjustment.
Note: The high-speed screw may need adjusting to reach the speed
control stop without exceeding 3800 RPM.
5. With the speed control in the high-speed position, adjust the high-
speed screw to obtain the desired engine speed (see Figures 4-7
or 4-10 depending on governor version).
4