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before using the machine. If any wear is noticed
(Fig. 65-B), replace the blade; refer to Removing the
Cutting Unit Blade, page 51.
Figure 65
3. Examine cutting edges of all blades. Sharpen cutting
edges that are dull or nicked. To assure sharpness,
sharpen only the top side of the cutting edge while
maintaining the original cutting angle (Fig. 66). If the
same amount of metal is removed from both cutting
edges, the blade will remain balanced.
SHARPEN AT THIS
ANGLE ONLY
Figure 66
End View
4. To check blade for being straight and parallel, remove
from cutting unit. Lay blade on level surface and check
its ends. Blade ends must be slightly lower than blade
center and cutting edge lower than heel of the blade. If
so, it will produce good quality–of–cut and require
minimal engine power to turn. By contrast, a blade with
ends higher than blade center, or with cutting edge
higher than the blade heel, is warped or bent and must
be replaced.
5. When assembling, make sure blade sail is facing up.
Torque the blade bolt to 140–165 ft.-lb.
Note: After striking a foreign object, torque all the spindle
pulley nuts to 140–160 ft–lbs.
Inspecting and Adjusting the
Cutting Unit Belt Tension
Important
After first ten hours of operation, check new
belts for proper tension; thereafter, check tension every 50
hours.
Front Cutting Unit
Note: Belts for wing unit spindles are tensioned by spring
loaded idlers and normally do not require tensioning.
1. Position machine on level surface, lower cutting unit to
shop floor, engage parking brake, stop the engine, and
remove the ignition key.
2. Remove deck covers.
3. Loosen jam nut and relieve tension on springs with
tensioner bolt (Fig. 67).
1. Jam nut
2. Tensioner bolt
4. Loosen (4) capscrews securing slide plate to motor
mount (Fig. 67).
5. Tighten tensioner bolt until springs are compressed to
dimension shown in figure 67.
6. Tighten jam nut securing adjustment (Fig. 67).
7. Tighten (4) capscrews securing slide plate to motor
mount (Fig. 67).
8. Replace deck covers.
52
4
1
2
3–1/6"– New belt
3–1/4"– Used belt
3
Figure 67
3. Slide plate
4. Tensioner bolt
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