40
MAINTENANCE
3.
Remove flange head screws securing gearbox
plate to deck. To separate plate and drive motor
assembly from deck, rotate plate end toward traction
unit (Fig. 67). Tip plate, motor and pulley assembly on
its side and remove from deck. Be careful not to bend,
twist, kink or damage flexible hydraulic lines.
Figure 67
1. Deck Cover
2. Gearbox Plate
3. Deck Pivot Shaft
4. Deck Clevis
5. Lift Bar
4.
Remove locknut securing deck pivot shaft into
deck clevis and lift bar (Fig. 67).
5.
Move the cutting unit away from the machine.
6.
To re-install cutting unit, assemble in reverse
order.
CHECKING AND CORRECTING CUTTING
BLADE MISMATCH
If there is mismatch between the blades, the grass will
appear streaked when it is cut. This can be corrected
by ensuring all blades are straight and cutting on the
same plane.
1.
Adjust cutting unit to highest height-of-cut.
Position castor wheel axles in lower castor fork holes
(Fig. 68, 69). If checking front cutting unit, reposition
two rear castor's clevis pins to highest height-of-cut
setting (Fig. 68). On the front castors, move all castor
spacers to the underside of the castor arms (Fig. 68).
To check outboard units, move all castor shaft spacers
to the underside of the castor arms and castor wheel
axles to lower castor fork holes.
Figure 68
1. High Range Height-of-Cut
2. Move to Highest Height-of-Cut Setting
2.
Place a flat 4 X 8 sheet of plywood at least 3/4 in.
(20 mm) thick down on a level surface and lower the
cutting unit onto the flat surface.
Figure 69
1. High Range Height-of-Cut
2. Move to Underside of Castor Arm
3. Castor Arm
3.
Rotate blade so ends face fore and aft. Measure
from flat surface to front tip of cutting blade and record
dimension. Rotate same blade so opposite end faces
forward and repeat measurement. Difference between
the two measurements must not exceed 1/8 in. (3 mm).
If difference exceeds 1/8 in. (3 mm), the blade is bent.
Replace it. Use same procedures to measure all
blades.
4.
Rotate blade so ends face fore and aft. Measure
from flat surface to front of cutting blade and record
dimension. Repeat process with all blades and
compare measurements. Maximum difference allowed
between any two adjacent blades is 1/4 in. (6 mm).
Maximum difference allowed between the highest and
lowest blade measurement is 3/8 in. (10 mm). If
measurements do not fit recommended standards,
add shims between the cutting deck and spindle
housing; proceed to step 6. If measurements meet
standards, proceed to step 5.
5.
Rotate blades so tips line up with one another. Tips
of adjacent blades must be within 1/8 in.(3 mm) of each
other. If tips are not within 1/8 in. (3 mm) of one another,
add shims between spindle housing and bottom of
cutter deck; proceed to step 6.
6.
Remove locknuts securing spindle housing to
deck in area where shims are to be added. To lower a
blade, add a shim (Part No. 3256-24), to each
mounting bolt, between spindle housing and cutter
deck. Repeat step 5. Continue process until blade tips
are within the required dimensions.
IMPORTANT:
Do not exceed three shims at any one
hole location. If more than one shim is added to any
one hole location, install decreased amounts of shims
in adjacent holes.
