Onan 3.0 AJ Operator's Manual page 13

GOVERNOR
The governor controls engine speed by opening or
closing the throttle according to the load taken off the
set (Figure 7). The engine speed also determines
voltage and frequency of the generator current.
Before readjusting the governor linkage, check for
binding at the linkage or throttle.
1. With unit stopped, disconnect governor control
rod from hole (E) on throttle shaft. While holding
throttle wide open, adjust length of governor
control rod so center-to-center distance is 1/8
inch. Change governor control rod length by
turning the threaded rod (A) near the ball joint.
When 1 /8 inch distance is reached, reconnect rod
at point E.
2. Run the set with a load to thoroughly warm it up.
3. Connect a voltmeter across the generatoroutput.
With the set operating at no load, adjust the speed
nut (C) until voltmeter reads 126volts. When afull
rated load is applied, voltage should not fall below
110 volts.
4. If voltage falls below 108 volts (with full load),
loosen the hex nuts on sensitivity spring stud and
screw stud (D) inward (clockwise) or recheck
step 1. If voltage is within limits, buttendsto surge
(alternately increases and decreases), turn the
spring stud outward (counterclockwise) until
voltage stabilizes.
5. Retighten nuts on lowerspring stud while holding
stud in position with a screwdriver.
Turning sensitivity stud (D) in or out, usually requires a correspon¬
ding change in speed adjustment nut (C). Table in Figure 7 shows
proper voltage speed and frequency ratings.
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FIGURE 7. GOVERNOR ADJUSTMENTS
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