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12 Generac
®
Power Systems, Inc.
3. Turn on appliances, lights, pumps, etc., that are
on the emergency circuits in an attempt to fully
load the generator. Be cautious not to overload
the generator. Use the following chart as a guide:
4. When full load has been achieved. Connect a fre-
quency meter to the output lugs of the generator’s
main line circuit breaker.
5. The fuel regulator is fitted with two adjustment
screws. While watching the frequency meter,
slowly turn the adjustment screws clockwise or
counterclockwise one at a time until the highest
frequency is read on the meter. (Figures 2.1 and
2.2).
Figure 2.1 — Dual Fuel Regulators
6. When the highest frequency is reached maximum
power has been set. From this point, turn both
adjustment screws 1/4 turn clockwise. The regu-
lator is now set.
Figure 2.2 — Placement of Regulator
7. Turn UTILITY power to the main distribution
panel back on. This can be done by switching the
service main breaker to the on or closed position.
Allow the generator to shut down.
Do not make any unnecessary adjustments.
Factory settings are correct for most applica-
tions. However, when making adjustments, be
careful to avoid overspeeding the engine.
If this procedure or equipment are not available,
locate the nearest Generac Dealer and they can per-
form 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:
1. Loosen governor clamp bolt (Figure 2.3).
Figure 2.3 — V-twin Engine Governor
Adjustment
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 2.4) 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.
7. Restart the unit.
8. Slowly turn the idle adjust screw to adjust the no-
load idle frequency to 63-63.5 Hz.
9. The governor is now set.
Governor Clamp Bolt
Governor
Shaft
(Rotate
Clockwise)
Idle Spring
No Load Idle
Adjustment Screw
!
Adjustment Screw
Adjustment
Screw
(One Side
Only)
V-twin
Adjustment
Screw
(Both Sides)
Set Pin
(Both Sides)
Section 2 — Post Installation Start-up and Adjustments
Air-cooled 8.5 kW Generator
Unit 120 Volts 240 Volts
8.5 kW 70.8 amps 35.4 amps