38
Figure 36
1. Cutting edge
2. Curved area
3. Wear/slot forming
Checking for Bent Blades
1. Rotate the blades until the ends face
forward and backward (
Figure 37
).
Measure from a level surface to the
cutting edge, of the blades (
Figure 37
).
Note this dimension.
Figure 37
1. Blades front to rear
2. Outside cutting edges
3. Measure here
2. Rotate the opposite ends of the blades
forward.
3. Measure from a level surface to the
cutting edge of the blades at the same
position as in step 1. The difference
between the dimensions obtained in steps
1 and 3 must not exceed 1/8 inch (3 mm).
If this dimension exceeds 1/8 inch (3 mm),
the blade is bent and must be replaced.
Refer to Removing the Blades and
Installing the Blades.
A blade that is bent or damaged could
break apart and could seriously injure
or kill you or bystanders.
•
Always replace bent or damaged
blade with a new blade.
•
Never file or create sharp notches
in the edges or surfaces of blade.
Checking for Loose Blades or
Damaged Spring Disk Washers
1. Place a wrench on the blade bolt and
torque to 45-55ft lbs (61-75 N-m).
2. With the wrench still on the blade bolt, hold
the blade spindle stationary and using a
rag or thickly padded glove, try to rotate
the blade. If the blade rotates relative to
the spindle guard without further tightening
the blade bolt, the two spring disk washers
have been flattened or damaged and must
be replaced (
Figure 38
). Refer to
Removing and Installing the Blades.
3. Once the blade has been removed, inspect
the two spring disk washers. If the
washers appeared to be damaged (the
washer surface has been marred) or
flattened they must be replaced. (
Figure
38
).
Note:
If the blade hits a solid object, the blade
bolt will tighten. The tightened blade bolt may
flatten or even invert the spring disk washers,
possibly causing damage. A damaged spring
disk washer must be replaced.
Removing the Blades
The blades must be replaced if a solid object
is hit, if the blade is out of balance, or the
blade is bent. To ensure optimum
performance and continued safety
conformance of the machine, use genuine
Exmark replacement blades. Replacement
blades made by other manufacturers may
result in an unsafe machine.
Hold the blade end using a rag or thickly-
padded glove (or place a wrench on the top
sheave nut). Remove the blade bolt, two
spring disk washers, bushing, and blade from
the spindle shaft (
Figure 38
).
