Maximum Engine Speed Adjustment; Governor Surge Adjustment - MacDon 9000 Operator's Manual

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,
connect tachometer to engine.
2. Start engine and let idle until normal operating
temperature is reached.
3. Move throttle lever to full forward position.
4. Adjust rod (A) w ith nuts (B)
until a no-load
engine speed of 2450 RPM is reached.
5. Finger tighten bolt
(C)
against governor lever
and lock position 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
ineffective. The result would be inability to maintain
engine 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