Kohler COMMAND CH18, Service Manual

Page: 93 / 232

5B.24
Section 5B
EFI Fuel System
If the governor/throttle components are all intact, but
you think there may be a problem with the
adjustment, follow Procedure A to check the setting. If
the governor lever was loosened or removed, go
immediately to Procedure B to perform the initial
adjustment.
A. Checking the Initial Adjustment
1. Unsnap the plastic linkage bushing attaching the
throttle linkage to the governor lever. See Figure
5B-37. Unhook the damper spring from the lever,
separate the linkage from the bushing, and
remove the bushing from the lever. Mark the hole
position and unhook the governor spring from
the governor lever.
Figure 5B-36. Idle Speed Screw Details.
The idle speed adjustment procedure remains the
same for engines with or without a dampening spring.
Typically, no periodic servicing is necessary in this
area. If however, removal/replacement of the
dampening spring is required, reinstall it as follows:
1. Thread the spring onto the end of idle screw
leaving 1-3 mm (0.039-0.117 in.) of the spring
extending beyond the end of the idle speed screw.
2. Secure spring onto the screw with a small amount
of Permabond ™ LM-737 or equivalent Loctite ®
adhesive. Do not get any adhesive on free coils of
spring.
3. Start the engine and recheck the idle speed
settings, after sufficient warm up. Readjust as
required.
Initial Governor Adjustment
The initial governor adjustment is especially critical
on EFI engines because of the accuracy and sensitivity
of the electronic control system. Incorrect adjustment
can result in overspeed, loss of power, lack of
response, or inadequate load compensation. If you
encounter any of these symptoms and suspect them to
be related to the governor setting, the following
should be used to check and/or adjust the governor
and throttle linkage.
Figure 5B-38. Throttle Details.
1-3 mm (0.039-0.117 in.)
Exposed Length Off End
Of Adjustment Screw
Idle Speed Screw
Dampening
Spring
(Some Models)
Linkage
Bushing
Throttle
Linkage
Damper
Spring
High-Speed
Throttle Stop Screw
Figure 5B-37. Throttle Linkage/Governor Lever
Connection.
2. Check if the engine has a high-speed throttle stop
screw installed in the manifold casting boss. See
Figure 5B-38.