Adjusting The Mower Belt Tension For 72In Mowers Only - Toro Z580-D Z Master 74266 Operator's Manual

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 63 and Figure 65.
Torque the bolt to 27 to 33 ft-lb (37 to 45 N-m).
10. Install the idler spring to the two posts (Figure 63
and Figure 65).
11. For 72 inch mowers, adjust the belt tension, refer to
Adjusting the Mower Belt Tension.
12. Install the belt covers by sliding the cover into the
tab, install the bolts, and close the latches (Figure 64).
1. Belt cover
2. Latch
Figure 63
5. Gearbox pulley
6. Idler spring
7. Idler plate (for 72 inch
mowers only)
Figure 64
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 65). 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 65).
6. Insert a ratchet or breaker bar into the square hole in
the idler plate to adjust the tension (Figure 65).
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 65.
8. While holding the belt tension and spring length,
tighten the idler plate bolts that secure the idler plate
(Figure 65).
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 65
4. Ratchet or breaker bar
5. Idler plate bolt