Adjusting The Mower Belt Tension For 72In Mowers Only - Toro 74266 Operator's Manual

Figure 64
1. Mower belt
2. Mower spindle pulley
3. Spring loaded idler pulley
4. Belt guide at a 45 degree
angle
9. Install the belt guide on the spring loaded idler at a
45 degree angle as shown in Figure 64 and Figure 66.
Torque the bolt to 27 to 33 ft-lb (37 to 45 N-m).
10. Install the idler spring to the two posts (Figure 64 and
Figure 66).
11. For 72 inch mowers, adjust the belt tension, refer to
Adjusting the Mower Belt Tension for 72in Mowers Only (page 47).
12. Install the belt covers by sliding the cover into the tab,
install the bolts, and close the latches (Figure 65).
Figure 65
1. Belt cover
2. Latch
5. Gearbox pulley
6. Idler spring
7. Idler plate (for 72 inch
mowers only)
3. Insert slot into the tab
Adjusting the Mower Belt
Tension for 72in Mowers Only
Service Interval: After the first 8 hours
Important: To ensure proper mower belt tension, which
will result in a longer belt life, check the mower belt
tension after the first 8 hours of use and 8 hours after
each belt change.
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. Adjust the mower deck to the 3 inch (76mm)
height-of-cut position.
4. Measure the spring length (Figure 66). If the spring
length is between 10 and 10-1/4 inches (25.4 and 26.0
cm), from post to post, no adjustment is needed.
5. Loosen the bolts holding the idler plate (Figure 66).
6. Insert a ratchet or breaker bar into the square hole in
the idler plate to adjust the tension (Figure 66).
7. Rotate the ratchet or breaker bar to move the idler
plate until the idler spring is between 10 and 10-1/4
inches (25.4 and 26.0 cm) from post to post as shown
in Figure 66.
8. While holding the belt tension and spring length,
tighten the idler plate bolts that secure the idler plate
(Figure 66).
1. Belt guide install at a 45
degree angle
2. Idler spring length
(between 10 and 10-1/4
inches (25.4 and 26.0 cm))
3. Idler plate
47
Figure 66
4. Ratchet or breaker bar
5. Idler plate bolt