Ariens GRAVELY Pro-Turn 400 Series Dealer/Owner/Operator Manual page 31

MOWER BLADES
Remove
(Figure 18)
CAUTION: Use sturdy gloves or
padding to protect hands when
working with mower blades.
Rotation of one blade will rotate
the other blades.
1. Turn the engine off. Remove the ignition
key.
2. Remove the bolts, bevel washers and
blades from the spindle assemblies.
Replace
1. Install the blades, bevel washers and
bolts on the spindle assemblies.
2. Torque bolts to 115 – 160 lbf-ft (156 –
217 N•m).
2
1. Blade
2. Cup Washer
3. Blade Bolt
4. Spindle Assembly
Figure 18
Sharpen the Mower Blades
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:
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• More than 1/2" (1.3 cm) of metal is
removed.
• Air lifts become eroded.
• Blade is bent or broken.
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 the
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.
See Figure 20.
4. Install mower blade(s) on unit.
5. Torque bolts to 115 – 160 lbf-ft (156 –
217 N•m).
DO NOT sharpen to this pattern.
2
Sharpen to this pattern.
DISCARD if more than
1/2" (1.27 cm)
1. Cutting Edge
2. Square Corner
3. Air Lift Erosion
4. Air Lift
Figure 19
IMPORTANT: When sharpening blades, be
sure to grind the same amount on each side.
Unbalanced blades will cause excessive
vibration and could cause the spindles to
wear prematurely.
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