Toro 74253 Operator's Manual page 54

8. Loosen the jam nut under the rear support arm and
adjust the adjustment bolt to get a measurement of
3-1/8 to 3-1/4 inches (80 to 83 mm) (Figure 75).
Note: It is recommended that both sides of the
mower are adjusted the same distance.
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 (Figure 76).
1. Measure here from blade
to hard surface
2. Measure the right blade at the A location, from a
level surface to the cutting edge of the blade tip
(Figure 76).
3. Record this measurement.
4. Measure the right blade at the B location, from a
level surface to the cutting edge of the blade tip
(Figure 76).
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 (Figure 76). If it is not correct, proceed to the
following steps.
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) (Figure 75).
Figure 76
2. Measure at A and B
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 (Figure 75).
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.
2. Check the distance between the two large washers,
it needs to be 10-1/2 inches (26.7 cm) for 60 inch
mower decks or 11–1/2 inches (29.2 cm) for 72 inch
mower decks (Figure 77).
3. Adjust this distance, by loosening the spring jam
nut and turning the nut in front of each spring
(Figure 77). 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 (Figure 77).
1. 10-1/2 inch (26.7 cm)
between the large washers
for 60 inch mower decks
2. Front nut
3. Spring jam nut
4. Front swivel
5. Swivel jam nut
54
Figure 77
6. Lift nut
7. Front support arm
8. Large washer
9. 11–1/2 inch (29.2 cm)
between the large washers
for 72 inch mower decks