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18 Owner Service
51642 (Rev. 11/9/2007)
Frequently check blades. They should be sharp,
free of nicks and cracks, and securely fastened.
Remove mower from tractor and locate for easy access
to bottom and top of mower. Secure to prevent mower
from falling.
Inspect blades before each use to determine that they
are tight and in good condition. Replace any blade that
is bent, excessively nicked, worn, or has any other
damage. Small nicks can be ground out when sharpen-
ing.
Blade Removal (Figure 11)
Wedge a block of wood between blade and mower
housing or install blade wrench over spindle pulley
bolts to prevent spindle from rotating while removing
bolts. Loosen Nylok blade bolt which has left hand
threads.
Remove bolt (6), cup washers (5), flat washer (4) and
blade (3). Shoulder washer (2) will not normally come
off machine unless intentionally removed.
Blade Installation (Figure 11)
Excessive blade slipping can cause the cup washers to
burn and lose their clamping force. If this happens, the
cup washers must be replaced. Inspect cup washers
before installation and replace if necessary.
Install shoulder washer (2), if removed, small end up.
Position blade (3) with cutting edge leading in counter-
clockwise rotation as viewed from the top of the mower.
Install flat washer (4), cup washers (5) and special
Nylok bolt (6) which has left hand threads. Torque bolt
to 170 lbs-ft.
Use a new Nylok blade bolt and cup washers
when you replace the blade. Do not substitute any
bolt for the special blade bolt. It is self-locking,
meeting the non-loosening requirements for this
application.
Your dealer can supply genuine replacement
blades. Substitute blades may not meet original
equipment specifications and may be dangerous.
Figure 11. Blade Installation & Removal
Blade Sharpening (Figure 12)
Always sharpen both cutting edges of each blade at
the same time, the same amount, to maintain balance.
Follow the original sharpening pattern as shown. Do
not sharpen blade to a razor edge, but leave a 1/32" to
1/16" blunt edge. Do not sharpen back side of blade.
Figure 12. Blade Sharpening
1. Blade wrench
2. Shoulder washer
3. Blade
4. Flat washer
5. Cup washer
6. Special Nylok bolt
w/left hand threads