Toro 30531, Operator'S Manual, Page: 35 / 44

35
5. Install the new mower belt.
6. Install the idler pulley.
7. Engage the blade control (PTO) lever and check the belt
tension. Refer to Adjusting the Mower Belt Tension,
page 35.
Note: The proper mower belt tension is 10–15 lbf
(44–67 N) with the belt deflected 1/2 in (13 mm) halfway
between the pulleys (Fig. 41).
2
m–4731
3
4
1
Figure 41
1. Idler pulley
2. 1/2 inch (13 mm)
deflection here
3. Assist arm
4. Front stop
8. Engage the blade control (PTO) lever.
9. Check the clearance between the bell crank and the
transmission output shaft (Fig. 42).
m–3860
1
4
5
6
2
3
Figure 42
1. 1/16–1/8 inch (2–3 mm)
2. Bell crank
3. Transmission output shaft
4. Hairpin cotter
5. Clevis pin
6. Clevis
Note: The clearance should be 1/16–1/8 inch (2–3 mm).
10. Remove the hairpin cotter and the clevis pin from the
bell crank.
11. Rotate the clevis clockwise on the rod to increase the
clearance; rotate it counterclockwise to decrease it
(Fig. 42).
12. Disengage the blade control (PTO) lever.
Note: If the assist arm does not contact the front stop on
the mower deck (Fig. 43), adjust the clevis to bring the
bell crank closer to the transmission output shaft
(Fig. 42).
m–4731
1 2
3
5
4
Figure 43
1. Locknut
2. Turnbuckle
3. Rear idler pulley
4. Front position for idler
pulley
5. Belt guide
13. Check the belt guide under the engine frame for the
proper adjustment (Fig. 40).
Note: The distance between the belt guide and the
mower belt should be 1-1/4 inch (32 mm) when you
engage the mower belt. Adjust the mower belt as
necessary. The disengaged belt should not drag or fall
off the pulley when the guides are properly adjusted.
Adjusting the Mower Belt
Tension
Service Interval/Specification
Check the belt tension after the first 8 operating hours and
every 25 operating hours thereafter. Check the belt tension
after every 50 operating hours.
Important The belt must be tight enough to not slip
during heavy loads while cutting grass. Over tensioning the
belt will reduce the bearing life of the belt and the spindle.
1. Disengage the blade control (PTO) lever and set the
parking brakes.
2. Stop the engine, remove the key, and wait for all
moving parts to stop before leaving the operating
position.
3. Loosen the locknut on the turnbuckle (Fig. 43).