Gravely 911530 - Pro 21 SCH - Manual (Page 18)

GB - 18
5. Make sure the idler pulley turns and the
idler arm moves freely.
6. Reinstall drive belt in reverse order.
IMPORTANT: Be sure the belt seats in sheave
and pulley grooves with the idler touching the
back (flat) side of belt.
7. Adjust rear wheels to the same cutting
height.
WHEEL DRIVE CONTROL
ADJUSTMENT
See Figure 10.
The wheel drive must start to engage when
wheel drive control is between 2-1/4" and
2-3/4" (5.7 and 7 cm) away from the
handlebar.
To check:
1. With engine off, select a slow speed.
2. Slowly pull unit backwards.
3. Slowly squeeze wheel drive control until
wheels stop.
4. Measure the distance between the wheel
drive control and handlebar at the
handlebar indentation.
To adjust:
1. If the measurement is more than 2-3/4"
(7 cm), loosen the lower cable nut and
then tighten the upper cable nut against
the adjuster bracket.
2. If the measurement is less than 2-1/4"
(5.7 cm), loosen the upper cable nut and
then tighten the lower nut against the
adjuster bracket.
3. Recheck measurement with the slowest
and fastest speeds selected.
4. Repeat adjustment until wheel drive
control is properly adjusted.
IMPORTANT: If there is not enough thread
length for proper adjustment, contact your
Dealer for repairs before operating unit.
Figure 9
1. Blade
2. Idler
3. Drive Sheave
4. Drive Belt 5. Engine Pulley
6. Bolt, Lock
Washer &
Flat Washer
OM1250
1
2
3
4
5
6
Figure 10
2-1/4" to 2-3/4"
(5.7 to 7 cm)
1. Handlebar Indentation
2. Wheel Drive Control
3. Traction Cable
4. Cable Nuts
OM0294
1
3
2
4