Replacing The Pump Drive Belt - Toro Z Master 74250 Operator's Manual

5. If adjustment is required, loosen the mower idler plate
and adjust it (Fig. 69).
6. Insert a ratchet or breaker bar into the square hole in
the mower idler plate to adjust the tension (Fig. 69).
7. To increase belt tension, rotate the mower idler plate
until resistance is felt and rotation stops. Do not go
past when it stops (Fig. 69).
8. Tighten the idler plate bolts (Fig. 69).
2
1
m–6826
Figure 69
1. Mower idler plate
2. Square hole
9. Check the distance from the rubber stop and the arm of
the spring loaded idler pulley when the idler plate is
tightened. It needs to be 0 to 1/4 inch (0 to 6 mm)
from the rubber stop (Fig. 70).
10. Adjust the belt tension and the idler plate, if necessary,
and tighten all hardware securely (Fig. 69).
6
4
2
1
m–6825
Figure 70
1. Spring loaded idler pulley
2. Top alignment hole
3. 0 to 1/4 inch gap
(0 to 6 mm)
3
4
3. Ratchet or breaker bar
4. Idler plate bolt
3
5
4. Idler pulley arm
5. Belt
6. Rubber bumper
50
11. If the mower idler plate contacts the end of the
adjustment slot and more belt tension is required, a
small change to the right side fixed idler can create
more belt tension adjustment (Fig. 71).
1
Figure 71
1. Fixed Idler

Replacing the Pump Drive Belt

Check pump drive belt for wear after every 50 hours of
operation.
1. Pull the spring loaded idler down and remove the
traction belt from the engine and hydro pump pulleys
(Fig. 72). Remove the belt between the pulleys.
2. Install the new belt around the engine and hydro pump
pulleys (Fig. 72).
3. Pull the spring loaded idler down and align it below
the traction belt. Release the pressure on the spring
loaded idler (Fig. 72).
Figure 72
2
m–3746
2. Adjustment slot