Toro FP Series Operator's Manual page 17

Checking the Belt Tension
Service Interval: Every 100 hours
Important: The best belt tension for the machine is
the lowest tension at which the belts will not slip under
full power.
1. Lay a straight edge on the belt and across the pulleys
(Figure 26).
Figure 26
1. Straight edge
2. With a force gauge, push down on the belt, midway
between the pulleys (Figure 26).
Note: The belt should deflect 7.6 mm (0.3 inch) from
the straight edge when pushing down on the belt with
1.4 to 2.3 kg (3 to 5 lb) of force (Figure 26).
Note: If the belt tension is too low or too high, adjust
the belt tension; refer to Adjusting the Belt Tension
(page 17).
2. Belt deflected 7.6 mm (0.3
inch) at 1.4 to 2.3 kg (3 to
5 lb) of force
Adjusting the Belt Tension
1. Remove the water tank; refer to Adding Water with the
Tank Removed (page 10).
2. Loosen the 2 hex-socket bolts (5/16-24 x 1.75 inches)
that secure the front of the engine (Figure 27).
1. Hex-socket bolts (5/16-24 x 1.75 inches)
3. Loosen the 2 flange nuts (8 mm) that secure the back
of the engine (Figure 28).
1. Flange nuts (8 mm)
4. Loosen the jam nut, and rotate the belt-tensioning
bolt clockwise to tension the belt, or rotate the
belt-tensioning bolt counterclockwise to loosen the
tension on the belt (Figure 28).
5. Check the belt tension; refer to Checking the Belt
Tension (page 17).
6. When the correct tension is reached, tighten the jam
nut on the belt-tensioning bolt.
7. Tighten the 2 hex-socket bolts (5/16-24 x 1.75 inches)
that secure the front of the engine to 12.5 to 16.4 N-m
(9.2 to 12.1 ft-lb) as shown in Figure 27.
8. Tighten the 2 flange nuts (8 mm) that secure the back
of the engine to 23 to 29 N-m (17 to 21 ft-lb) as shown
in Figure 28.
17
Figure 27
Figure 28
2. Belt-tensioning bolt