Replacing The Pump Drive Belt; Adjusting The Push Arms - Toro 74410 Operator's Manual

Figure 50
1. Ratchet with short
extension or breaker
bar
8. To increase the belt tension, rotate the ratchet or
breaker bar counterclockwise to move the fixed
idler arm until you feel increased resistance and the
spring-loaded idler pulley stops moving.
Note: Do not increase the belt tension beyond the
point where the fixed idler arm stops.
9. While holding the belt in tension, tighten the 2 bolts
that secure the fixed idler arm.
10. Remove the ratchet or breaker bar from the square
hole in the fixed idler arm.
11. Install the belt covers over the outside spindles.

Replacing the Pump Drive Belt

Service Interval: Every 50 hours
Check the pump drive belt for wear after every 50
operating hours.
1. Remove the mower belt first; refer to Replacing the
Mower Belt.
2. Remove the bolt from the clutch stop and unplug
the clutch electrical wire (Figure 51).
3. Pull the spring loaded idler to the side.
4. Remove the traction belt from the engine and the
hydraulic pump pulleys (Figure 51).
5. Install the new belt around the engine and the
hydraulic pump pulleys (Figure 51).
6. Pull the spring-loaded idler to the side and align the
belt.
7. Release the pressure on the spring loaded idler
(Figure 51).
8. Install the mower belt.
2. Square hole
1. Belt
2. Clutch electrical wire
3. Clutch stop

Adjusting the Push Arms

If needed, adjust the push arms to increase or decrease
the mower belt tension.
1. Loosen the jam nut and rotate the ball joint
counterclockwise, one turn at a time (Figure 52).
1. Push arm
2. 13-1/2 inch (343 mm)
nominal at 15 degree twist
2. Adjust each side the same amount. Each push arm
should have a nominal length of 13-1/2 inch (34 cm)
at a 15 degree twist (Figure 52).
Note: Increase the tension by lengthening the push
arms; decrease the tension by shortening the push
arms.
40
Figure 51
4. Bolt
5. Clutch
6. Idler
Figure 52
3. Jam nut
4. Ball joint