Gravely PRO-24 HW Owner's/Operator's Manual page 27

Adjust Wheel Drive Upper Belt
Tension
The wheel drive upper belt connects the
variable speed (VS) pulley to the drive rollers
shaft.
1. Remove both the upper and lower
guards. See Drive Belt Guard on
page 23.
NOTE: The bearing holders slide vertically on
the wheel drive frame.
2. Loosen two flanged lock nuts and round
head square neck bolts securing each
bearing holder to wheel drive frame. Do
not remove mounting hardware. See
Figure 29.
NOTE: Use the pressure of one finger at the
center of the belt span to check for proper
flex.
3. Pull drive rollers shaft up to tension
upper belt to flex 1/4", ±1/8" (6mm,
±3mm).
4. Snug two flanged lock nuts and round
head square neck bolts securing each
bearing holder to wheel drive frame.
5. Check that drive rollers shaft is level
horizontally by measuring the position of
both bearing holders on the wheel drive
frame. The positions should be equal
(±1/8") on both sides.
6. If adjustment is necessary, gently tap on
bearing holders to make position
adjustments.
7. Tighten the two flanged lock nuts and
round head square neck bolts securing
each bearing holder to wheel drive
frame.
8. Install both the upper and lower guards.
See Drive Belt Guard on page 23.
Wheel Drive
Frame
Drive Rollers
Shaft
Blade Drive Belt
GB - 27
Bolt and
Bearing
Flanged
Holder
Lock Nut
Wheel
Drive
Upper Belt
Figure 29