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OM-481 Page 27
7-9. Adjusting Overspeed Shutdown Valve
Drawing #
Y Stop engine, and let cool.
The overspeed shutdown valve
protects the engine from damage
due to high engine speed. If the en-
gine stops, the valve may be
closed.
Shutdown speed is between 1950
and 2100 rpm. Use a tachometer to
check shutdown speed as follows:
Open right side door and remove
rear panel.
1 Air Cleaner
2 Hose Into Air Cleaner
3 Hose Clamp
Loosen clamp and remove hose.
4 Plastic Cap
5 High Speed Stop Screw
6 Lock Nut
Remove plastic cap from screw.
Loosen nut. Turn screw out (toward
front of engine) several turns.
7 Speed Control Lever
8 Overspeed Shutdown Valve
Start engine and increase speed by
moving lever toward high speed
stop screw. Note engine rpm when
valve closes and stops engine.
If shutdown speed is not between
1950 and 2100 rpm, adjust as
follows:
9 Lock Nut
10 Valve Adjustment Screw
Loosen nut and turn screw one turn
(clockwise to increase and counter-
clockwise to decrease shutdown
rpm). Tighten nut.
Check shutdown speed and repeat
adjustment if needed.
Y Stop engine.
Turn high speed stop screw in until
screw touches lever. Tighten lock
nut on screw and reinstall plastic
cap.
Install hose and hose clamp. Install
rear panel and close side door.
If necessary, adjust engine speed
according to Section 7-5
2
3
10 98
Tools Needed:
1
7
65 4
Engine End
3/8 in
OFF
START
RUN