Governor Adjustment - Generac Power Systems OHVI GSH 220 Service Manual

SHAFT
Figure 4-5. Governor Gear Shaft
lINkAGe INSTAllATIoN
Differences may exist between governor/carburetor link-
ages, depending on the type of equipment on which the
engine is used.
The best method for installation of linkage and springs is to
record the attachment points prior to disassembly. Reinstall the
governor rod, link and spring(s) in the same manner.
In the typical connection system shown in Figure - (page
-), the governor rod connects to the governor lever at one
end; to the carburetor throttle arm at the opposite end.
In some applications, an anti-lash spring also will be con-
nected at these two points.

GoverNor AdjuSTMeNT

INITIAL ADJUSTMENT:
Before starting the engine, complete an initial adjustment
of the governor as follows:
. Loosen the GOVERNOR LEVER CLAMP BOLT (see
Figure -).
2. While holding the GOVERNOR LEVER at its full "INCREASE
RPM" position, rotate the GOVERNOR ARM clockwise
as far as it will go. Then, tighten the GOVERNOR LEVER
CLAMP BOLT.
. For adjustable carburetors, turn the carburetor IDLE JET
in (clockwise) until it just bottoms. DO NOT FORCE. Then,
back the IDLE JET out (counterclockwise)
(see Figure 4-6).
. All Generac carburetors have fixed main jets. Carburetors
CRANKCASE COVER
RUNNING ADJUSTMENT:
INSTALL SHAFT
After completing the INITIAL ADJUSTMENT, final adjustment
FLUSH WITH
can be accomplished with the engine running. Proceed as
OUTER BOSS
follows:
NOTE: For AC generator applications, disconnect or turn
OFF all electrical loads. For non-generator applications,
turn OFF the equipment being powered. Initial checks
and adjustments will be accomplished with engine at
no-load.
. If so equipped, set the idle control switch to OFF.
2. Start the engine, let it warm up and stabilize at no-load.
. For AC generator applications, connect an AC frequency
a. If the generator is rated 60 Hertz, the no-load AC fre-
b. If the generator is rated 50 Hertz, the no-load AC fre-
. For non-generator applications (pumps, pressure washers,
NOTE: Several types of inexpensive tachometers are
commercially available.
5. If the frequency (or rpm) reading is incorrect, turn the
6. If frequency or rpm is unstable, turn the IDLE SPEED SCREW
7. When the no-load frequency or rpm is correct, apply a load to
a. For AC generator applications, connect electrical loads as close
b. For non-generator applications, turn on the equipment being
8. With a load applied to the engine, adjust the carburetor as
about 1-1/2 turns
a. CARBURETOR WITH FIXED MAIN JET: Slowly adjust the
-
SeCTIoN 4: MeCHANICAl GoverNor
built prior to 997 may have been equipped with adjustable
jets. If so equipped, turn the MAIN JET in (clockwise) until
it just bottoms. DO NOT FORCE. Then, back the MAIN JET
out (counterclockwise) about -/2 turns
meter to one of the generator's AC output receptacles.
quency reading should be 6.5-6.5 Hertz.
quency should be 50.5-5.5 Hertz.
etc.), refer to the product DATA PLATE for rated engine
speed. Use a tachometer to read engine speed.
SPEED ADJUST NUT (Figure -) on the governor until
frequency or rpm is within limits.
on carburetor until engine stabilizes. DO NOT TURN THE
IDLE SPEED STOP SCREW IN FURTHER THAN NECESSARY.
Fine tune this adjustment after the engine has warmed up
and stabilized. Adjust it /8 turn at a time.
the engine.
as possible to the unit's rated wattage/amperage capacity.
powered by the engine.
follows:
IDLE SPEED STOP SCREW to obtain best operation and
(see Figure 4-6)
.
4