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C and D series mowers
Blade Sharpening
Use proper safety equipment when sharpening blades: wear eye protection and keep all
! CAUTION
! CAUTION
guards in place on the grinder used for sharpening.
1.
Determine if the blade is too worn to sharpen:
•
The minimum width of the blade at its narrow-
est point should be no less than 1-5/8"
(4.1275cm).
•
There should be no bending, metal separation,
or obvious physical damage.
•
The wings should still have a square trailing
edge that is 50% of the thickness of the original
blank (blade stock).
•
There should be no damage to the drive fea-
ture.
2.
To sharpen the cutting blades: See Figure 2.5.
•
Dress the original bevel of the cutting edge.
•
Do not sharpen the bottom edge of the blade,
and do not extend the bevel beyond the length
of the original cutting edge.
•
Remove equal amounts of metal from both ends
of the blade, maintaining the original 29° to 32°
angle.
3.
Balance the blade after sharpening: dress the edge of
whichever end of the blade is heavier until the blade
stays level on the balancer. See Figure 2.6.
A poorly balanced blade will cause
! CAUTION
! CAUTION
excessive vibration and may cause
damage to the mower and result in
personal injury.
NOTE: MTD blade balancer AR-SBB-102 or the
blade balancing kit, AR-BSK-1 can be used to
balance the blade.
10
Figure 2.5
Blade balancing:
NOTE: the blade is positioned upside-
down for better fit on the balancer
Figure 2.6
Blade sharpening
on a bench grinder
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