Adjusting The Mower Belt Tension For 72 Inch Mower Decks - Toro 74253 Operator's Manual

1. Belt cover
2. Latch
4. Loosen the idler plate bolts holding the idler plate
(Figure 59).
5. Remove the idler spring.
6. Remove the belt guide on the spring loaded idler
pulley shown in Figure 57 and Figure 59.
7. Remove the existing belt.
8. Install the new belt around the mower pulleys and
the gearbox pulley under the engine (Figure 57).
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 55 and Figure 59.
Torque the bolt to 27 to 33 ft-lb (37 to 45 N-m).
Figure 56
3. Insert slot into the tab
Figure 57
5. Gearbox pulley
6. Idler spring
7. Idler plate
10. Install the idler spring to the two posts (Figure 55
and Figure 59).
11. 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 58).
1. Belt cover
2. Latch
Adjusting the Mower Belt
Tension for 72 inch Mower
Decks
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 59). 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 59).
6. Insert a ratchet or breaker bar into the square hole in
the idler plate to adjust the tension (Figure 59).
43
Figure 58
3. Insert slot into the tab