Generac Power Systems 04389-3, 04456-3, 04390-3 Engine Governor Adjustment, ‹ 2.7.1 7 KW UNITS

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.

‹2.7.2 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.

2.7ENGINE 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

SECONDARY

ADJUST SCREW

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

Idle Spring

Governor

Shaft

(Rotate

Clockwise)

Governor Clamp Bolt	No Load Idle
	Adjustment Screw

GOVERNOR

SHAFT

GOVERNOR

CLAMP

BOLT

Figure 2.5 — Full Load Speed Adjust Screw

V-twin Engines

Full Load Speed Adjust Screw

PRIMARY

ADJUST

SCREW

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