4 - 16
Mower Pitch and Height
Proper blade pitch is when the blade tip, measured
from the bottom surface (Figure 10), is 1/4" to 3/8"
(6.4 to 9.9 mm) lower at front of mower pan than when
same tip is at rear of mower pan.
Adjusting front lift link raises or lowers front of mower
pan and changes both cutting height and pitch.
To adjust:
1. Loosen jam nut on front link to allow for movement
of coupling nut.
2. Turn coupling nut clockwise to raise and
counterclockwise to lower front of mower pan.
3. Secure coupling in position by tightening jam nut.
Adjusting rear lift links raises or lowers rear of mower
pan and changes both cutting height and pitch.
To adjust:
1. Loosen both lower jam nuts to allow for movement
of upper jam nuts on lift rods.
2. Turn both upper jam nuts on each lift rod equality
to raise or lower rear of pan.
3. Secure lift rods in position by tightening lower jam
nuts.
If proper pitch cannot be obtained with front and rear lift
links:
1. Loosen nut on carriage bolt and remove cap screw
holding lift strap and adjustment strap together.
2. Slide lift strap and adjustment strap together to
raise, or apart to lower rear of pan.
3. Select tapped hole in lift strap that provides proper
adjustment, install cap screw in tapped hole and
tighten nut on carriage bolt to secure.
4.8 ANTI-SCALP ROLLERS
Secure rollers in middle position for average lawn
mowing.
1. Use lowest roller position when mowing in higher
cutting heights and rough terrain to guard against
most scalping.
2. Use highest roller position when cutting at lowest
cutting height.
For smoothest appearing cut when using frame
suspended models with anti-scalp rollers, keep anti-
scalp rollers adjusted to the minimum 1/2" (12.8 mm)
above flat hard smooth surface after setting height of
cut.
NOTE: The rollers are intended for anti-scalping, not
for controlling cutting height.
4.9 VENTS
The vents are opened at the factory to increase airflow
into deck for bagging purposes. To open, align the
vents on deck with spindle housing holes (Figure 12).
Front of Unit
Figure 10
1. Blade Cutting Edges
2. Ground Level
3. Front Blade Height
4. Rear Blade Height
OT0850
1
2
3
4
Figure 11
1. Lift Strap
2. Cap Screw-Remove to
Adjust
3. Carriage Bolt
4. Adjustment Strap
1
2
3
4
Figure 12
Vents
Summary of Contents for 301-310
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