Adjusting No-Load Frequency - Generac Power Systems NP Series Installation Manual

NOTE: The generator engine is equipped with a high
oil temperature switch. The switch has normally-open
N.O.) contacts which will close at about 2Q4°F
140''C). When the switch contacts close, engine
shuts down automatically.
IMPORTANT; GENERAC RECOMMENDS THAT
YOU TEST THE GENERATOR FOR ADEQUATE
COOLING.
ADJUSTING NO-LOAD FREQUENa
With engine stopped, visually inspect the ANTI-LASH
SPRING. Replace spring if broken or damaged;
attach if disconnected.
For Series Q-40G, NP-66G/LP, Q-55G/LP and Q-
70G/LP generators proceed as follows (Figure 30):
1. Loosen the GOVERNOR CLAMP NUT.
2. Push spring end of GOVERNOR LEVER all the way up to
its wide open throttle position.
• Hold the GOVERNOR LEVER at wide open throttle
and insert screwdriver into slotted end of GOVER¬
NOR SHAFT. Rotate the GOVERNOR SHAFT fully
counterclockwise (CCW).
• While holding the GOVERNOR SHAFT fully coun¬
terclockwise and the GOVERNOR LEVER at wide
open throttle, tighten the GOVERNOR CLAMP NUT
to 70 inch-pounds (8 N-m).
Figure 30 — Governor Adjustment
for NP-66G et.al.
3. Start engine, let it stabilize and warm up at no-load.
4. Turn the ADJUSTER NUT to obtain a frequency reading
of 62 Hertz.
5. Determine if the GOVERNOR SPRINGis properly located
in the notched teeth of the GOVERNOR ADJUSTMENT
BRACKET as follows:
• If droop is excessive, move the GOVERNOR SPRING
to the left on the notched teeth of BRACKET
(toward GOVERNOR SHAFT).
• For greater stability, move the GOVERNOR SPRING
to the right on notched teeth of BRACKET.
6. After repositioning the SPRING on the BRACKET notched
teeth, recheck frequency reading and, if necessary, read¬
just ADJUSTER NUT to obtain 62 Hertz at no-load.
7. When frequency is correct at no-load, check the AC volt¬
age reading. If voltage is incorrect, the voltage regulator
may require adjustment.
For Series NP-50G/LP generators proceed as follows
(Figure 31):^
NOTE: The governor system is located behind the
engine wrapper on the left hand side of the unit.
1. Loosen the GOVERNOR CLAMP BOLT.
2. Push spring end of GOVERNOR LEVER clockwise to
wide open throttle position of lever.
• Hold the GOVERNOR LEVER at wide open throttle
and, with a pair of pliers, rotate the GOVERNOR
SHAFT fully counter clockwise.
Figure 31 — Governor Adjustment for NP-50G
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