Check Mower Blades - Gravely 915172 Operator's Manual

CHECK MOWER BLADES

Check blades for wear. Replace or sharpen
as needed.
CAUTION: AVOID INJURY. Use
sturdy gloves or padding to
protect hands when working with
mower blades.
Rotation of one blade rotates the
other blades.
Remove Blades
See Figure 15.
1. Stop engine, remove key and wait for all
moving parts to stop and for hot parts to
cool.
2. Remove hardware securing blades to
spindles and remove blades. Retain all
hardware for reinstallation.
1
4
1. Spindle
2. Mower Blade
3. Washer
4. Nut
Figure 15
Sharpen Blades
CAUTION: DO NOT sharpen
blades while attached to unit.
See Figure 16.
1. Remove blades from unit. Discard blades
if:
• More than 1.3 cm (1/2") of metal is
removed.
• Air lifts are eroded.
• Blades are bent or broken.
2. File or grind an equal amount of material
DO NOT sharpen to this
pattern.
2
Sharpen to this pattern.
1. Cutting Edge
2. Square Corner
3. Air Lift Erosion
2
4. Air Lift
3
3. Check blade balance by sliding blade on
Install Blades
1. Reinstall blades, washers and nuts on
2. Torque bolts to 136 – 163 N•m
EN - 22
from each cutting edge of the blade until
sharp. DO NOT change angle of cutting
edge or round the corner of the blade.
3
Figure 16
CAUTION: Unbalanced blades
cause excessive vibration and
eventual damage to unit.
Balance blades before
reinstalling on unit.
NEVER weld or straighten
blades.
an unthreaded bolt. If blade does not
remain horizontal, sharpen the heavy end
until blade is balanced.
spindles. See Figure 15.
(100 – 120 lb-ft).
1
1
4