Kohler Command PRO ECV630 Service Manual page 60

EFI SYSTEM-BOSCH
3. Place throttle control in IDLE/SLOW position and
check idle speed with a tachometer. Turn idle speed
screw in or out as required to obtain 1500 RPM, or
idle speed specified by equipment manufacturer.
4. Idle speed adjustment can affect high idle speed
setting. Move throttle control to full throttle position
and check high idle speed. Adjust as necessary to
3750 RPM, or speed specified by equipment
manufacturer.
Idle Speed Screw Dampening Spring
Idle Speed Screw Details
B
A
Dampening Spring
A
(Some Models)
C Idle Speed Screw
A small dampening spring is attached to end of idle
speed screw of some EFI engines to help stabilize no
load operating speeds.
Idle speed adjustment procedure remains same for
engines with or without a dampening spring. Typically, no
periodic servicing is necessary in this area. If however,
removal/replacement of dampening spring is required,
reinstall it as follows:
1. Thread spring onto end of idle screw leaving 1-3 mm
(0.039-0.117 in.) of spring extending beyond end of
idle speed screw.
2. Secure spring onto 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 engine and recheck idle speed settings, after
sufficient warm up. Readjust as required.
60
C
1-3 mm (0.039-
0.117 in.) Exposed
B
Length Off End Of
Adjustment Screw
®
KohlerEngines.com
Initial Governor Adjustment
Initial governor adjustment is especially critical on
EFI engines because of accuracy and sensitivity of
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
governor setting, following should be used to check and/
or adjust governor and throttle linkage.
If governor/throttle components are all intact, but you
think there may be a problem with adjustment, follow
Procedure A to check setting. If governor lever was
loosened or removed, go immediately to Procedure B to
perform initial adjustment.
A. Checking Initial Adjustment
1. Unsnap plastic linkage bushing attaching throttle
linkage to governor lever. Unhook damper spring
from lever, separate linkage from bushing, and
remove bushing from lever. Mark hole position
and unhook governor spring from governor lever.
2. Check if engine has a high-speed throttle stop
screw installed in manifold casting boss.
a. On engines without a stop screw, pivot throttle
shaft and plate assembly into FULL
THROTTLE position. Insert a 1.52 mm (0.060
in.) feeler gauge between rear tang of throttle
shaft plate and underside of manifold boss.
Use a locking pliers (needle nose works best)
to temporarily clamp parts in this position.
b. On engines with a stop screw, pivot throttle
shaft and plate into FULL THROTTLE
position, so tang of throttle shaft plate is
against end of high-speed stop screw.
Temporarily clamp in this position.
3. Rotate governor lever and shaft counterclockwise
until it stops. Use only enough pressure to hold it
in that position.
4. Check how end of throttle linkage aligns with
bushing hole in governor lever. It should fall in
center of hole. If it doesn't, perform adjustment
procedure as follows.
B. Setting Initial Adjustment
1. Check split where clamping screw goes through
governor lever. There should be a gap of at least
1/32". If tips are touching and there is no gap
present, lever should be replaced. If not already
installed, position governor lever on cross shaft,
but leave clamping screw loose.
2. Follow instructions in Step 2 of Checking Initial
Adjustment, then reattach throttle linkage to
governor lever with bushing clip. It is not
necessary to reattach damper or governor
springs at this time.
3. Insert a nail into hole in top of cross shaft. Using
light pressure, rotate governor shaft
counterclockwise as far as it will turn, then torque
nut on clamping screw to 6.8 N·m (60 in. lb.).
Make sure that governor arm has not twisted up
or down after nut has been tightened.
24 690 02 Rev. D