Gravely ZT 50, Owner'S/Operator'S Manual

Page: 20 / 34

GB - 20
REPLACING MOWER BLADE
Remove
(Figure 12)
1. Block mower blades to prevent rotation.
2. Remove mounting hardware and mower
blades from spindles.
Install
(Figure 12)
1. Install mower blades on spindles with
mounting hardware.
2. Torque 5/8-inch nut to 92 to 130 lbf-ft
(125 to 176 N•m).
SHARPENING MOWER BLADE
1. Remove mower blade from unit (see
REPLACING MOWER BLADE on
page 20).
Gravely recommends having mower blades
sharpened by a professional. Contact your
Gravely dealer.
Discard mower blade if (figure 13):
• more than 1/2 in. (1.27 cm) of metal is
removed.
• the air lift erosion area is eroded.
• the mower blade is bent or broken.
Do not change angle of cutting edge or round
the corner at the end of mower blade.
2. Sharpen mower blade by removing an
equal amount of material from each end
of mower blade.
3. Check mower blade balance by sliding
mower blade on an unthreaded bolt. If
blade is balanced, it should remain in a
horizontal position. If either end of
mower blade moves downward, sharpen
the heavy end until mower blade is
balanced.
CAUTION: Mower blades are
sharp and can cut you. Wrap
the blades or wear gloves, and
use extra caution when
servicing them.
Figure 11
1. Trunnion 2. Mower Deck
1
2
CAUTION: DO NOT sharpen
mower blade while on unit. An
unbalanced mower blade will
cause excessive vibration and
eventual damage to unit. Check
mower blade balance prior to
reinstalling mower blades.
NEVER weld or straighten mower
blades.
Figure 12
1. Spindle
2. Blade
3. Washer
4. 5/8 in. Nut
1
2
3
4