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GB - 24
Wheel Drive Speed Adjustment
The wheel drive lower belt connects the
mower blade shaft to a variable speed (VS)
pulley. Wheel drive speed is determined by
how deep the wheel drive lower belt rides in
the VS pulley. The higher the belt rides in the
VS pulley groove, the slower the wheel drive
speed. The lower the belt rides in the VS
pulley groove, the faster the wheel drive
speed. See Figures 24 and 25.
1. Remove both the upper and lower
guards. See WHEEL DRIVE
ADJUSTMENTS Drive Belt Guard on
page 23.
2. Loosen the wheel drive lower belt
tension. See Adjust Wheel Drive Lower
Belt Tension on page 27.
3. Loosen set screw in VS pulley.
4. To change wheel drive speed:
• Rotate the pulley outer half clockwise,
moving it inward. This causes the belt
to ride higher in pulley, decreasing
wheel drive speed.
• Rotate the pulley outer half
counterclockwise, moving it outward.
This causes the belt to ride lower in
pulley, increasing wheel drive speed.
5. Tighten the VS pulley set screw onto
one of the flats of the shaft to secure it in
position.
6. Tighten the wheel drive lower belt
tension. See Adjust Wheel Drive Lower
Belt Tension on page 27.
7. Install both the upper and lower guards.
See WHEEL DRIVE ADJUSTMENTS
Drive Belt Guard on page 23.
Figure 25
Slower Walking Speed
Faster Walking Speed
Belt Higher In Groove
Set
Screw
Belt Lower In Groove
Set
Screw
VS
Pulley
Half
VS
Pulley
Half
Set
Screw
VS Pulley
Outer Half
Wheel Drive Lower Belt
Wheel Drive Upper Belt
Flat on
Shaft