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24 Generac
®
Power Systems, Inc.
3.7 ENGINE GOVERNOR ADJUSTMENT
If both AC frequency and voltage are correspondingly
high or low, adjust the engine governor as follows:
3.7.1 6 KW UNITS (NON-SA)
1. Loosen the governor clamp bolt (Figure 3.1).
2. Push the spring end of the governor lever clock-
wise to the wide open throttle position of
the lever.
• Hold the governor lever at wide open throttle and,
with a pair of pliers, rotate the governor shaft
fully clockwise.
• While holding the governor shaft fully clockwise
and the governor lever at wide open throttle,
tighten the governor clamp bolt to 70 inch-
pounds (8 N-m).
3. Start the engine; let it stabilize and warm up at
no-load.
4. Turn the adjuster nut to obtain a frequency read-
ing of 62 Hertz.
5. Determine if the governor spring is properly
located in the slot of the governor lever as
follows:
• If droop is excessive, move the governor spring
down one slot on the lever.
• For greater stability, move the governor spring up
one slot on the lever.
6. After repositioning the spring on a lever slot,
recheck the frequency reading and, if necessary,
readjust the adjuster nut to obtain 62 Hertz at
no-load.
7. When frequency is correct at no-load, check the
AC voltage reading. If voltage is incorrect, the volt-
age regulator may require adjustment.
Figure 3.1 – 6 kW
Engine Governor Adjustment
3.7.2 8 KW AND 10 KW UNITS (NON-SA)
1. Loosen the governor clamp bolt (Figure 3.2).
2. Push the spring end of the governor lever clock-
wise to the wide open throttle position of
the lever.
• Hold the governor lever at wide open throttle
and, with a screwdriver, rotate the governor
shaft fully clockwise.
• Before tightening, verify that the governor lever is
pushed all the way onto the governor shaft.
• While holding the governor shaft fully clockwise
and the governor lever at wide open throttle,
tighten the governor clamp bolt to 70 inch-
pounds (8 N-m).
3. Start the engine; let it stabilize and warm up at
no-load.
4. Turn the speed adjust nut to obtain a frequency
reading of 62 Hertz.
5. When frequency is correct at no-load, check the
AC voltage reading. If voltage is incorrect, the volt-
age regulator may require adjustment.
Figure 3.2 – 8 kW and 10 kW
Engine Governor Adjustment
NOTE:
If the engine continues to run fast, use a pair of
pliers to bend the bend tab clockwise to release
tension on the lower governor spring.
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Section 3 — Post-installation Start-up Adjustments
Guardian Air-cooled Generators