Adjusting The Mower Belt; Tension - Toro 74272CP 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 54.
Important: Check and make sure the
belt is installed into both the front and rear
belt guides (Figure 56).
4. Check the belt tension. The spring loaded idler
center bolt needs to be near the top alignment
hole in left support plate (Figure 56).
Figure 56
1. Center bolt
2. Alignment hole
5. If adjustment is required, loosen the idler plate
to adjust it (Figure 57).
6. Insert a ratchet or breaker bar into the square
hole in the idler plate to adjust the tension
(Figure 57).
7. To increase belt tension, rotate the ratchet or
breaker bar to move the fixed idler until you
feel increased resistance and the spring-loaded
idler pulley stops moving (Figure 57).
Note: Do not increase the belt tension
beyond the point where the fixed idler arm
stops.
8. While holding the belt tension, tighten the
idler plate bolts that secure the idler plate
(Figure 57).
3. Left support plate
4. Spring loaded idler
Figure 57
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
(Figure 58).
Figure 58
1. Spring loaded idler pulley
2. Top alignment hole
3. 0 to 1/4 inch gap (0 to 6
mm)
10. Adjust the belt tension and the idler plate, if
necessary, and tighten all hardware securely
(Figure 57).
11. If the 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
(Figure 59).
44
3. Ratchet or breaker bar
4. Idler plate bolt
4. Idler pulley arm
5. Belt
6. Rubber bumper