Replacing The Drive Belts; Adjusting The Drive Belts - Toro Z Master Z597-D Operator's Manual

Replacing the Drive Belts

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.
Note: Remove the top drive belt first if the
bottom drive belt needs to be replaced.
1. Disengage the PTO, move the motion control
levers to the neutral locked position and set
the parking brake.
2. Stop the engine, remove the key, and wait for
all moving parts to stop before leaving the
operating position.
3. Remove the rear engine panel (Figure 61).
Figure 61
1. Rear engine panel
4. Pull on the spring loaded idler pulley to loosen
the belt tension (Figure 62).
5. Remove the mower belt from the top
pulley of the three stacked pulleys
(Figure 60 and Figure 62).
6. Remove the worn drive belt.
7. Install the new drive belt around the clutch
pulley, the adjustable idler pulleys, the spring
loaded idler pulley, and the front three stacked
pulleys (Figure 62).
8. Adjust the belt tension; refer to Adjusting the
Drive Belts.
9. Install the mower belt around the mower
pulleys and the top pulley of the three stacked
pulleys (Figure 60 and Figure 62).
Figure 62
1. Drive belt
2. Clutch
3. Spring loaded idler pulley

Adjusting the Drive Belts

1. Disengage the PTO, move the motion control
levers to the neutral locked position and set
the parking brake.
2. Stop the engine, remove the key, and wait for
all moving parts to stop before leaving the
operating position.
Note: Measure only the spring coils.
3. Measure the length of the spring. Check
to make sure the coils of the spring on the
spring-loaded idler pulley measures as listed
below (Figure 63 and Figure 64).
• Left spring measurement: 5-3/4 ± 1/8 inch
(14.6 ± 0.3 cm) (Figure 63).
• Right spring measurement: 5-1/2
± 1/8 inch (14.0 ± 0.3 cm) (Figure 63).
4. If the spring does not have the correct
measurement, loosen the nut holding the
adjustable idler pulley so it can move up and
down in the slot (Figure 64).
5. Relieve the pressure on the spring-loaded idler
pulley (Figure 64).
6. Position the adjustable pulley lower in the slot
and tighten the nut (Figure 64).
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4. Adjustable idler pulley
5. Three stacked pulleys
6. Mower belt