Adjusting The Mower Belt Tension - Toro 74247 Operator's Manual

Adjusting the Mower Belt
Tension
1. Disengage the PTO, move the motion control levers to
the neutral locked position and set the parking brake.
2. Stop the engine, remove the key, and wait for all
moving parts to stop before leaving the operating
position.
3. Raise the mower to the transport position.
Important
Check the amount of twist in the belt
between the pulleys. Make sure it is only what is specified
in Figure 69.
Important
Check and make sure the belt is installed
into both the front and rear belt guides (Fig 71).
4. Check the belt tension. The spring loaded idler center
bolt needs to be near the top alignment hole in left
support plate (Fig 71).
3
1
Figure 71
1. Center bolt
2. Alignment hole
5. If adjustment is required, loosen the mower idler plate
and adjust it (Fig. 72).
6. Insert a ratchet or breaker bar into the square hole in
the mower idler plate to adjust the tension (Fig. 72).
7. To increase belt tension, rotate the mower idler plate
until resistance is felt and rotation stops. Do not go
past when it stops (Fig. 72).
8. Tighten the idler plate bolts (Fig. 72).
1
2
M–4417
3. Left support plate
4. Spring loaded idler
49
2
1
m–6826
Figure 72
1. Mower idler plate
2. Square hole
9. Check the distance from the rubber stop and the arm of
the spring loaded idler pulley when the idler plate is
tightened. It needs to be 0 to 1/4 inch (0 to 6 mm)
from the rubber stop (Fig. 73).
10. Adjust the belt tension and the idler plate, if necessary,
and tighten all hardware securely (Fig. 72).
6
4
2
1
m–6825
Figure 73
1. Spring loaded idler pulley
2. Top alignment hole
3. 0 to 1/4 inch gap
(0 to 6 mm)
11. If the mower idler plate contacts the end of the
adjustment slot and more belt tension is required, a
small change to the right side fixed idler can create
more belt tension adjustment (Fig. 74).
3
4
3. Ratchet or breaker bar
4. Idler plate bolt
3
5
4. Idler pulley arm
5. Belt
6. Rubber bumper