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Blade Maintenance
Blade Safety
•
Inspect the blade periodically for wear or damage.
•
Use care when checking the blades. Wrap the
blades or wear gloves, and use caution when
servicing the blades. Only replace or sharpen the
blades; never straighten or weld them.
•
On multi-bladed machines, take care as rotating 1
blade can cause other blades to rotate.
Servicing the Blade Plane
The cutting unit comes from the factory preset at 5
cm (2 inches) height of cut and blade rake of 7.9 mm
(0.310 inch). The left and right heights are also preset
to within ± 0.7 mm (0.030 inch) of the other.
The cutting unit is designed to withstand blade
impacts without deformation of the chamber. If the
blade strikes a solid object, inspect the blade for
damage and the blade plane for accuracy.
Inspecting the Blade Plane
1.
Remove the hydraulic motor from the cutting unit
and remove the cutting unit from the machine.
2.
Use a hoist (or minimum of 2 people) and place
the cutting unit on a flat table.
3.
Mark 1 end of the blade with a paint pen or
marker. Use this end of the blade to check all
heights.
4.
Position the cutting edge of the marked end of
the blade at 12 o'clock (straight ahead in the
direction of mowing)
height from table to cutting edge of blade.
Figure 81
5.
Rotate the marked end of the blade to the 3 and
9 o'clock positions
heights.
(Figure
81) and measure
(Figure
81) and measure the
6.
Compare the 12 o'clock measured height to the
height-of-cut setting. It should be within 0.7 mm
(0.030 inch). The 3 and 9 o'clock heights should
be 1.6 to 6.0 mm (0.060 to 0.240 inch) higher
than the 12 o'clock setting and within 2.2 mm
(0.090 inch) of each other.
If any of these measurements are not within
specification, proceed to
(page
65).
Adjusting the Blade Plane
Start with the front adjustment (change 1 bracket at a
time).
1.
Remove the height-of-cut bracket, (front, left, or
right) from the cutting-unit frame
2.
Adjust 1.5 mm (0.060 inch) shims and/or 0.7
mm (0.030 inch) shims between the cutting-unit
frame and bracket to achieve the desired height
setting
(Figure
1. Height-of-cut bracket
3.
Install the height-of-cut bracket to the cutting-unit
frame with the remaining shims assembled
below the height-of-cut bracket.
4.
Secure the socket-head bolt/spacer and flange
nut.
Note:
Socket-head bolt/spacer are held
together with thread-locking adhesive to prevent
the spacer from falling inside the cutting-unit
frame.
5.
Verify the 12 o'clock height and adjust if needed.
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6.
Determine if only 1 or both (right and left)
height-of-cut brackets need to be adjusted.
Note:
If the 3 or 9 o'clock side is 1.6 to 6.0 mm
(0.060 to 0.240 inch) higher than the new front
height then no adjustment is needed for that
65
Adjusting the Blade Plane
(Figure
82).
Figure 82
2. Shims
82).
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