Gravely Pro-Master 252 Owner's/Operator's Manual page 24

MOWER BLADE
NOTE: If mower is used under sandy soil
conditions, replace mower blades when air
lifts become eroded through at ends
(Figure 12).
Removal (Figure 11)
CAUTION: Mower blades are
sharp and can cut you. Wrap
mower blades or wear gloves, and
use extra caution when servicing.
1. Block mower blades to prevent rotation.
1
1. Mower Blade
2. Spindle Shaft
3. Washer
4. Bolt
2. Remove bolts, washers, and mower
blades from spindle shafts.
Installation (Figure 11)
1. Install mower blades, washers, and bolts
on spindle shafts.
2. Tighten bolts to 115-160 lbf-ft
(156-217 N•m).
SHARPENING MOWER BLADE
(Figure 12)
NOTE: If mower is used under sandy soil
conditions, replace mower blades when air
lifts become eroded through at ends.
CAUTION: DO NOT sharpen
mower blades while on unit. An
unbalanced mower blade will
cause excessive vibration and
eventual damage to unit. Check
mower blade balance before
reinstalling blades.
NEVER weld or straighten bent
blades.
Figure 11
1. Remove mower blade from unit.
Discard mower blade if (Figure 12):
• More than 1/2 in. (1.27 cm) of metal is
removed.
• Air lifts become eroded.
• Blade is bent or broken.
DO NOT Sharpen To This Pattern
2
3
Sharpen To This Pattern
3
4
DISCARD if more
than 1/2 in. (1.27 cm)
1. Air Lift Erosion Area
2. Cutting Edge
2. Sharpen mower blade by removing an
equal amount of material from each end
of mower blade. DO NOT change angle
of cutting edge or round the corner of
mower blade.
3. Check mower blade balance. Slide
mower blade on an unthreaded bolt. A
balanced blade should remain in a
horizontal position. If either end of
mower blade moves downward, sharpen
the heavy end until blade is balanced.
4. Install mower blade on unit.
ANTI-SCALP ROLLER
ADJUSTMENT
(Figure 13)
The anti-scalp rollers are set at the factory for
typical mowing height, but can be adjusted for
high or low cutting conditions.
Anti-Scalp rollers are intended to prevent
lawn scalping, not to control cutting height.
For a very high cutting height, set the anti-
scalp rollers in the lowest position on the
bracket.
GB - 24
1
2
Figure 12
OF3310