MacDon 9000 - Maximum Engine Speed Adjustment; Governor Surge Adjustment

MAINTENANCE/SERVICE
Gasoline Engine (continued)
MAXIMUM ENGINE SPEED ADJUSTMENT -
GAS ENGINE
A
WARNING: To avoid personal injury, disengage all drives and engage park brake. It is necessary
to have the engine running for this procedure. Be sure everyone in the area is aware that the
machine is being serviced.
Use extreme care when working around moving parts. Never wear loose fitting dothing or dangling items
such as scarves or bracelets. Keep hands, feet, dothing and hair away from moving parts.
Maximum engine speed is controlled by the
governor.
To adjust:
1. If unit is not equipped with optional tachometer,
co nn ect tachometer to engine.
2. Start engine and let i dle until normal operating
temperature is reached.
3. Move throttle lever to full forward position.
4. Adjust rod (A) wi th nuts (B) until a no-load
engine speed
of 2450 RPM is reached.
5. Finger tighten bolt ( C) against governor lever
and l
ock positi on with jam nut.
6. Adjust governor surge if necessary. See
"Governor Surge Adjustment" in this section.
GOVERNOR SURGE ADJUSTMENT - GAS ENGINE
To check surge, move throttle lever rapidly from
idle
to full forward. The governor should surge
(hunt) from one
to three times.
A
WARNING: Follow safety instructions
given above under "Maximum Engine
Speed Adjustment".
If surging occurs more than three times, turn
bumper screw
(A) in to reduce surge.
IMPORTANT : Do not turn bumper screw in too
far, as this will cause the governor to become
ineffec
ti ve . The result would be inability to maintain
engi
ne speed under load. The bumper screw
should never be turned in so far that engine speed
"wanders " more than 15 RPM .
To adjust bumper screw:
1. Loosen
jam nut (8).
2. Turn bumper screw
(A) to correct surge.
3. Tighten jam nut
to secure the position.
NOTE: If bumper screw adjustment does not
correct surge, see your Windrower dealer.
56
MAXIMUM ENGINE SPEED ADJUSTMENT
GOVERNOR SURGE ADJUSTMENT