Adjusting The Mower Belt; Tension - Toro 74237 Operator's Manual

2. Stop the engine, remove the key, and wait for
all moving parts to stop before leaving the
operating position.
3. Remove the belt covers.
4. Loosen the nut securing the idler plate and
move the idler plate to relieve the belt tension
on the idler pulley (Figure 47).
5. Remove the nut, washer and belt guide from
the rear leftside pulley.
6. Remove the mower belt from the belt guides
and remove the belt (Figure 47).
7. Install the new mower belt around the mower
spindle pulleys, mower idler pulley, into the
belt guides, into rear idler arm assembly, and
the clutch (Figure 47).
8. Install the belt guide with a washer and nut
onto the rear leftside pulley.
Note: Check the amount of twist in the belt
between the pulleys. Ensure it is only what is
specified in Figure 47.
Figure 47
1. Clutch
2. Mower belt
3. 1/4 trun belt twist
4. Belt guide
5. Mower spindle pulley
9. Adjust the belt tension, refer to Adjusting the
Mower Belt Tension.
10. Install the belt covers and close the latches.
6. Mower idler pulley
7. Belt guide installed
8. Nut
9. Washer
10. Rear left side pulley

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 47.
Important: Check and make sure the
belt is installed into both the front and rear
belt guides (Figure 48).
4. Check the belt tension. The spring loaded idler
center bolt needs to be near the top alignment
hole in left support plate (Figure 48).
Figure 48
1. Center bolt
2. Alignment hole
5. If adjustment is required, loosen the idler plate
to adjust it (Figure 49).
6. Insert a ratchet or breaker bar into the square
hole in the idler plate to adjust the tension
(Figure 49).
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 49).
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 49).
39
3. Left support plate
4. Spring loaded idler