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

Note:
If the assist arm does not contact the
front stop on the mower deck
the clevis to bring the bell crank closer to the
transmission output shaft
1. 13 mm (1/2 inch) deflection
here
2. Assist arm
3. Front stop
13. Check the belt guide under the engine frame for
the proper adjustment
Note:
The distance between the belt guide and
the mower belt should be 32 mm (1-1/4 inch)
when you engage the mower belt. Adjust the
mower belt as necessary. The disengaged belt
should not drag or fall off the pulley when the
guides are properly adjusted.
Adjusting the Mower Belt
Tension
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:
Adjust the brake when you adjust the
belt tension or the brake linkage.
Important:
The belt must be tight enough to
not slip during heavy loads while cutting grass.
Overtensioning the belt reduces the life of the
spindle bearing, the belt, and the idler pulley.
1. Disengage the PTO and engage the parking
brake.
(Figure 43), adjust
(Figure 42).
Figure 43
4. Locknut
5. Turnbuckle
(Figure 41).
2. Shut off the engine, remove the key, and wait
for all moving parts to stop before leaving the
operating position.
3. Loosen the locknut on the turnbuckle
44).
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 44).
Note:
The eyebolt threads on both ends of the
turnbuckle should be engaged a minimum of 8
mm (5/16 inch).
5. Engage the PTO and check the belt tension.
Adjust tension until it is correct.
Note:
The proper mower belt tension is 44 to
67 N∙m (10 to 15 ft-lb) with the belt deflected
13 mm (1/2 inch) halfway between the pulleys
(Figure 44).
g001478
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 (page
38
(Figure
Figure 44
2. Idler pulley
43).
g001476