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Correcting Cutting Unit Mismatch
If there is mismatch between the blades, the grass will
appear streaked when it is cut. This problem can be cor-
rected by making sure the blades are straight and all
blades are cutting on the same plane.
1. Using a 3 foot (1 m) long carpenters level, find a lev-
el surface on the shop floor.
2. Raise height–of–cut to the highest position: refer to
Adjusting Height–Of–Cut.
3. Lower cutting unit onto flat surface. Remove covers
from top of cutting unit.
4. Unhook spring from idler arm bracket to release belt
tension.
5. Rotate blades until the ends face forward and back-
ward. Measure from floor to front tip of cutting edge and
remember this dimension. Then rotate same blade so
opposite end is forward and measure again. The differ-
ence between dimensions must not exceed 1/8 of an
inch (3 mm). If dimension exceeds 1/8 of an inch (3 mm),
replace the blade because it is bent. Make sure to mea-
sure all blades.
6. Compare measurements of outer blades with the
center blade. Center blade must not be more than 3/8 of
an inch lower than the outer blades. If center blade is
more than 3/8 of an inch (9 mm) lower than the outer
blades. proceed to step 7 and add shims between
spindle housing and bottom of cutting unit.
7. Remove capscrews, flatwashers, lockwashers and
nuts from outer spindle in the area where shims must be
added. To raise or lower the blade, add a shim, Part No.
3256–24, between spindle housing and bottom of cut-
ting unit. Continue to check alignment of blades and add
shims until tips of blades are within the required dimen-
sion.
IMPORTANT: Do not use more than three shims at
any one hole location. Use decreasing numbers of
shims in adjacent holes if more than one shim is
added to any one hole location.
8. Hook spring onto idler arm bracket. Reinstall belt
covers.
If there is mismatch between the blades, the grass will
appear streaked when it is cut. This problem can be cor-
rected by making sure the blades are straight and all
blades are cutting on the same plane.
72 inch
Cutting Units
Groundsmaster 3000/3000–D
Page 11 – 19
72 inch Cutting Units