Installation Of Governor External Parts; Governor Gear Shaft Replacement; Inspection; Removal - Generac Power Systems GN190H Service And Repair Manual

1. Remove the CAPSCREW from the IDLE CONTROL BRACKET.
2. Loosen the GOVERNOR LEVER CLAMP BOLT.
3. Loosen SPEED ADJUST SCREW and NUT until the GOVER-
NOR SPRING can be removed.
4. Lift the GOVERNOR LEVER from the GOVERNOR SHAFT.
5. Disconnect the GOVERNOR ROD and ANTI-LASH SPRING
from the GOVERNOR LEVER.
Set the governor external parts aside.

INSTALLATION OF GOVERNOR EXTERNAL PARTS:

AFTER the installation of the engine shrouds and covers,
reinstall the governor external parts as follows (refer to
Figure 3.3):
1. Reattach the GOVERNOR ROD and ANTI-LASH SPRING to
the GOVERNOR LEVER.
2. Slide the GOVERNOR LEVER onto the GOVERNOR SHAFT.
3. Tighten the GOVERNOR LEVER CLAMP BOLT.
4. Reinstall the GOVERNOR SPRING to the GOVERNOR LEVER
and SPEED ADJUST SCREW, then tighten the SPEED ADJUST
NUT accordingly.
5. Reinstall the CAPSCREW into the IDLE CONTROL BRACKET.
See BLOWER HOUSING SCREW under "TORQUE SPECIFI-
CATIONS", page 59, for proper tightness.
For proper governor adjustment, refer to "GOVERNOR
ADJUSTMENT" on this page.

GOVERNOR GEAR SHAFT REPLACEMENT

CAUTION! DO NOT TWIST THE GEAR SHAFT WITH
A VISE GRIP OR ANY OTHER TOOL. THIS COULD
RESULT IN ENLARGEMENT OF THE SHAFT BOSS.

INSPECTION:

If the governor gear shaft is scored, damaged or worn, it
should be replaced.
GOVERNOR GEAR SHAFT DIAMETER
GN-190, GN-191, GN-220:
0.236-0.237 inch (6.004-6.012mm)

REMOVAL:

If it becomes necessary to replace the governor gear shaft,
remove the crankcase cover (See Section 11). Use care to avoid
damage to the shaft boss area of the crankcase cover. Clamp
the shaft in a vise, then tap the flange with a wooden or plas-
tic mallet to remove the shaft.
SECTION 3: MECHANICAL GOVERNOR

INSTALLATION:

Start the new shaft into the shaft boss by tapping lightly
with a soft mallet. Add red Loctite ® to the shaft. Then, use
a press or vise to press the shaft into the boss. The shaft is
properly positioned when its end is just flush with the exter-
nal boss of the crankcase cover. Be sure to wipe away any
excess Loctite ® from the flange.
CRANKCASE
COVER
SHAFT
Figure 3.4 — Governor Gear Shaft

LINKAGE INSTALLATION

Differences may exist between governor/carburetor linkages,
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. Rein-
stall the governor rod, link and spring(s) in the same manner.
In the typical connection system shown in Figure 3.3 (previ-
ous 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:
1. Loosen the GOVERNOR LEVER CLAMP BOLT (Figure 3.3).
2. While holding the GOVERNOR LEVER at its full "INC. RPM" posi-
tion, rotate the GOVERNOR SHAFT clockwise as far as it will go.
Then, tighten the GOVERNOR LEVER CLAMP BOLT.
TORQUE SPECIFICATION
GOVERNOR LEVER CLAMP BOLT:
70 inch-pounds
19
INSTALL SHAFT
FLUSH WITH
OUTER BOSS