Inspecting The Belts; Replacing The Mower Belt - Toro 74401 Operator's Manual

6. Measure between the tip of the front blade (Fig. 41) and
the tip of the rear blade to the flat surface. If the front
blade tip is not 1/16–5/16 in. (1.6–7.9 mm) lower than
the rear blade tip, adjust the front trunnion rods.
2
4
Figure 41
1. Blade front to rear
2. Measure front blade tip
7. To adjust the front-to-rear blade slope, remove the
hairpin cotter from the front trunnion yokes and loosen
the jam nuts (Fig. 42).
3
1
2
Figure 42
1. Front trunnion rod yoke
2. Hairpin cotter
8. Rotate the yokes on the rods to change the adjustment
(Fig. 42). To raise the front of the mower, tighten the
yokes (shorten the rods). To lower the front of the
mower, loosen the yokes (lengthen the rods).
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3
1
4
3. Measure rear blade tip
4. Measure here
m–5178
3. Jam nut
9. After adjusting both trunnion rod yokes evenly, secure
the yokes with the hairpin cotters. Check the
front-to-rear level again. Continue adjusting the yokes
until the front blade tip is 1/16–5/16 in. (1.6–7.9 mm)
lower than the rear blade tip (Fig. 41).
10. When the front-to-rear blade slope is correct, tighten the
jam nuts (Fig. 40 and 42).
11. Recheck the side-to-side level of the mower; refer to
Leveling the Mower from Side-to-Side, page 29.
12. Check the height of the anti-scalp rollers; refer to
Adjusting the Anti-Scalp Rollers, page 16.

Inspecting the Belts

Inspect all belts every 100 hours.
Check the belts for cracks, frayed edges, burn marks, or any
other damage. Replace damaged belts.

Replacing the Mower Belt

Squealing when the belt is rotating, blades slipping when
cutting grass, frayed belt edges, burn marks, and cracks are
signs of a worn mower belt. Replace the mower belt if any
of these conditions are evident.
1. Stop the engine, set the parking brake, remove the key,
and disconnect the spark plug wire(s) from the spark
plug(s).
2. Set the height-of-cut at 1-1/2 in. (38 mm).
3. Remove the belt covers over the outside spindles.
4. Pull the idler pulley in the direction shown in Figure 43
and roll the belt off of the pulleys.
Note: Do not remove the spring.
Caution
The spring is under tension when installed and can
cause personal injury.
Do not remove the spring from the spring eye bolt.
5. Route the new belt through the idler arm and around the
idler pulley (Fig. 43).
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