Generac Power Systems 04389-3 - Manual (Page 15)

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Section 2 — Post Installation Start-up and Adjustments
Air-cooled 7 kW, 12 kW and 15 kW Generators
If this procedure or the equipment are not available,
locate the nearest Dealer and they can perform the
adjustments.
NOTE:
A service fee may be charged for this adjustment.
2.7 ENGINE GOVERNOR ADJUSTMENT
If both AC frequency and voltage are correspondingly
high or low, adjust the engine governor as follows:
2.7.1 7 KW UNITS
1. Loosen the governor clamp bolt (Figures 2.3).
2. Hold the governor lever at its wide open throttle
position, and rotate the governor shaft clockwise
as far as it will go. Then, tighten the governor
lever clamp bolt to 70 inch-pounds (8 N-m).
3. Start the generator; let it stabilize and warm up
at no-load.
4. Connect a frequency meter across the generators
AC output leads.
5. Turn the primary adjust screw to obtain a fre-
quency reading of 61.5 Hertz. Turn the secondary
adjust screw to obtain a frequency of 62.5 Hz.
6. When frequency is correct at no load, check the
AC voltage reading. If voltage is incorrect, the volt-
age regulator may require adjustment.
Figure 2.3 — Engine Governor Adjustment
Single Cylinder Engines
GOVERNOR
SHAFT
PRIMARY
ADJUST
SCREW
GOVERNOR
CLAMP
BOLT
SECONDARY
ADJUST SCREW
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2.7.2 12 KW AND 15 KW UNITS
1. Loosen governor clamp bolt (See Figure 2.4).
2. Completely remove the idle spring.
3. With governor arm at wide open throttle position,
rotate governor shaft fully clockwise. Tighten
clamp bolt to 84 inch-pounds.
4. Start unit and apply full load. Use full load speed
adjust screw (Figure 2.5) to adjust frequency to
58 Hz.
5. Remove load, stop engine, loosen the idle adjust
screw and reconnect the idle spring.
6. Using a hand, push the governor arm to the
closed throttle position. Make sure the idle spring
does not stretch at all.
Figure 2.4 — Engine Governor Adjustment
V-twin Engines
Governor Clamp Bolt
Governor
Shaft
(Rotate
Clockwise)
Idle Spring
No Load Idle
Adjustment Screw
Figure 2.5 — Full Load Speed Adjust Screw
V-twin Engines
Full Load Speed Adjust Screw
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