Gravely Rapid XZ Series Owner's Manual page 16

Installation (Figure 19)
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
NOTE: If mower is used under sandy soil conditions, replace
mower blades when air lifts become eroded through at ends
(figure 20).
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.
1. Remove mower blade from unit.
Discard mower blade if (figure 20):
• 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
Sharpen To This Pattern
DISCARD
if more
than 1/2 in.
(1.27 cm)
1
1. Air Lift Erosion
Area
1. 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.
2. 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.
3. Install mower blade on unit.
2
2. Cutting Edge
Figure 20
ANTI-SCALP ROLLER ADJUSTMENT
The anti-scalp rollers are set at the factory for typical
mowing height, but can be adjusted for high or low cutting
conditions (figure 21).
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.
For a very low cutting height, set the anti-scalp rollers in the
highest position on the bracket.
NOTE: There are six anti-scalp rollers on the outside of the
mower deck. Make sure all anti-scalp rollers are set at the
same height.
Lowest
Cutting
Height
Highest
Cutting
Height
BELT REPLACEMENT
Remove Mower Drive Belt
Figure 22
1. Set the deck to its lowest cutting height.
2. Stop engine, wait for all moving parts to stop and hot
parts to cool, set the parking brake and remove the key
from the ignition.
3. Open footplate and remove belt covers.
4. Loosen, do not remove, idler spring adjusting bolt.
See Figure 22.
5. Remove belt from idler, gearbox pulley and spindle
pulleys.
OF3310
GB - 16
Figure 21
OF3590