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10 Operation
5WPMAN0242 (Rev. 5/2/2008)
CUTTING HEIGHT ADJUSTMENT
Keep all persons away from operator control
area while performing adjustments, service, or
maintenance.
NOTICE
■ Avoid low cutting heights. Striking the ground
with blades produces one of the most damaging
shock loads a mower can encounter. Allowing
blades to contact ground repeatedly will cause
damage to mower and drive.
1. Level mower from side to side. Check by measur-
ing from mower frame to the ground at each deck
rail.
2. Adjust, using tractor 3-point arm leveling device.
NOTE:
Best mowing results will be obtained with
front of mower level with or slightly lower than the
rear.
3. Control cutting height with tractor 3-point arms and
front and rear caster wheel adjustment.
4. Raise rear of mower, move caster adjustment
spacers under caster arms. Hex opening of blade
wrench fits bolts on top of caster shaft.
5. Raise front of mower with tractor 3-point arms.
Move spacers under front caster wheel arms.
NOTE:
Cutting height is the distance between the
blade and the ground. The blades are 7-3/4" below
the top of the deck rail on the GM1060 and 8-3/4"
below the top of the deck rail on the GM1072. To
check cutting height, place a straight edge along top
edge of deck rail as shown in Figure 4.
6. Measure from bottom of straight edge to the
ground at locations A and B. Subtract 7-3/4" on
GM1060 (8-3/4" on GM1072) from measurement B
to determine cutting height.
Figure 4. Cutting Height Adjustment
NOTE: Remember, measurement at location A, Figure
4, should not be less than location B and should not be
over 1/2" greater than location B.
TRACTOR TOP LINK ADJUSTMENT
When the cutting height is set, adjust tractor top link
until mower top link attachment point A is aligned verti-
cally with mower hitch pin B.
Adjust tractor top link so mower is level between caster
wheel and ground (dimension C, Figure 6). This will
allow the mower to follow ground contour.
Figure 5. Top Link Adjustment
Figure 6. Gauge Wheel Distance
SPACERS REQUIRED UNDER
CASTER ARM PIVOT TUBE
Cut
Height
1/2"
Spacer
3/4"
Spacer
1"
Spacer
1-1/4"
Spacer
1-1/2"
2" 1
2-1/2" 1
3" 11
3-1/2" 2
4" 12
4-1/2" 111
5" 1111
5-1/2" 121
6" 1121
Table 1: Cutting Height Chart
1. Tractor top link
A. Mower top link
attachment point
B. Mower hitch pin
(Rev. 7/21/2008)