Adjusting The Mower Belt Tension - Toro 30672 Operator's Manual

Adjusting the Mower Belt
Tension
Adjusting the Tension for 32in and 36in
Mower Decks
Service Interval: After the first 8 hours—Check the mower
belt tension.
After the first 25 hours—Check the mower belt
tension.
Every 50 hours—Check the mower belt tension.
Important: The brake needs to be adjusted when the
belt tension or the brake linkage is adjusted.
Important: The belt must be tight enough to not slip
during heavy loads while cutting grass. Over tensioning
the belt will reduce the spindle bearing life, the belt life
and the idler pulley life.
The belt must be tight enough so it does not slip during heavy
loads while cutting grass and over-tensioning will reduce belt
and spindle bearing life.
1. Disengage the blade control (PTO) lever and set the
parking brakes.
2. Stop the engine and wait for all moving parts to stop
before leaving the operating position.
3. Loosen the locknut on the turnbuckle (Figure 45).
4. Rotate the turnbuckle toward the rear of the mower to
increase the tension on the belt. Rotate the turnbuckle
toward the front of the mower to decrease the tension
on the belt (Figure 45).
Note: The eyebolt threads on both ends of the
turnbuckle should be engaged a minimum of 8 mm
(5/16 inch).
5. Engage the bladed control lever (PTO) and check the
belt tension. Adjust tension until it is correct.
Note: The proper mower belt tension is 44-67 N-m
(10-15 ft-lb) with the belt deflected 13 mm (1/2 inch)
halfway between the pulleys (Figure 45).
32in and 36in Mower Deck
1. Mower belt with 13 mm
(1/2 inch) deflection
6. Tighten the locknut on the turnbuckle.
7. Check the blade brake adjustment; refer to Adjusting
the Blade Brake.
Adjusting the Tension for 48in Mower
Decks
Important: The belt must be tight enough to not slip
during heavy loads while cutting grass. Over tensioning
the belt will reduce the spindle bearing life, the belt life
and the idler pulley life.
Important: The brake needs to be adjusted when the
belt tension or the brake linkage is adjusted.
1. Disengage the blade control (PTO) lever and set the
parking brakes.
2. Stop the engine and wait for all moving parts to stop
before leaving the operating position.
3. Loosen the locknut on the turnbuckle (Figure 47).
4. Rotate the turnbuckle toward the rear of the mower to
increase the tension on the belt. Rotate the turnbuckle
toward the front of the mower to decrease the tension
on the belt (Figure 47).
Note: The proper mower belt tension is 44-67 N-m
(10-15 ft-lb) with the belt deflected 13 mm (1/2 inch)
halfway between the pulleys (Figure 46).
34
Figure 45
2. Idler pulley