43
9. Tighten the jam nut under the rear support arm and
tighten the bolt securing the chain to the rear support
arm.
10. Adjust the opposite side if needed.
Adjusting the Front–to–Rear Mower Pitch
1. Position the right blade front-to-rear (Fig. 56).
2. Measure the right blade at the A location (Fig. 56), from
a level surface to the cutting edge of the blade tip
(Fig. 57).
3. Record this measurement.
4. Measure the right blade at the B location (Fig. 56), from
a level surface to the cutting edge of the blade tip
(Fig. 57).
5. Record this measurement.
6. The mower blade should be a 1/4 to 3/8 inch
(6 to 10 mm) lower at position A than at position B
(Fig. 56). If it is not correct, proceed to the following
steps.
Front
B
m–1078
A
Figure 56
MEASURE FROM
CUTTING EDGE TO
A LEVEL SURFACE
m–2539
Figure 57
Note: Both of the front swivels need to be adjusted the
same amount to maintain equal chain tension.
7. Loosen the front swivel jam nuts, at the front of the
right and left swivels, approximately a 1/2 inch
(13 mm) (Fig. 58).
8. Adjust the lift nuts on both the left and the right side of
the machine to achieve 1/4 to 3/8 inch (6 to 10 mm)
lower in front at A than in the rear at B (Fig. 58).
9. Tighten both swivel jam nuts against the front swivel to
lock the height.
10. Check to make sure there is equal tension on the chains
and adjust again if needed.
Adjusting the Compression Spring
1. Raise the mower lift lever to the transport position
(Fig. 58).
2. Check the distance between the two large washers, it
needs to be 10–1/4 inches (260 mm) (Fig. 58).
3. Adjust this distance, by loosening the spring jam nut
and turning the nut in front of each spring (Fig. 58).
Turning the nut clockwise will shorten the spring;
counter–clockwise will lengthen the spring.
4. Lock the nut into position by tightening the spring jam
nut (Fig. 58).
Front
2
1
3
4
5
7
6
8
8
m–6921
Figure 58
1.
10–1/4 inch (260 mm)
between the large
washers
2.
Front nut
3.
Spring jam nut
4.
Front swivel
5.
Swivel jam nut
6.
Lift nut
7.
Front support arm
8.
Large washer
Adjusting the Push Arms
If needed, adjust the push arms to increase or decrease the
mower belt tension.
1. To adjust the push arms, loosen the jam nut and rotate
the ball joint counterclockwise, one turn at a
time.(Fig. 59).
2. Adjust each side the same amount. Each push arm
should have a nominal length of 15-5/16 inch (389 mm)
(Fig. 59).
Note: Increase the tension by lengthening the push arms
and decrease the tension by shortening the push arms.
