Toro Z580-D, Operator'S Manual, Page: 49 / 68

Replacing the Pump Drive Belt
Service Interval: Every 50 hours—Check the pump
drive belt.
Note:
Remove the PTO drive belt first if the pump
drive belt needs to be replaced.
1. Tilt the seat forward and remove the front engine
panel.
2. Remove the PTO drive belt.
3. Remove the spring from the idler arm (Figure 65).
4. Install the new belt around the engine and hydro
pump pulley (Figure 65).
5. Install the PTO drive belt.
6. Install the spring to the idler arm (Figure 65).
Figure 65
1. Clutch 3. Spring
2. Pump drive belt 4. Spring loaded idler pulley
Replacing and Tensioning the
Alternator Belt
Replacing the Alternator Belt
Service Interval: Every 50 hours—Check the alternator
belt.
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 4 bolts holding the oil cooler shield to
the rear frame (Figure 66).
4. Remove the 3 bolts holding the engine straps to the
side of the machine (Figure 66).
Figure 66
1. Oil cooler shield 3. Engine straps
2. Bolts
5. Remove the 4 bolts holding the oil cooler and
position the oil cooler to the side (Figure 67).
6. Remove the 2 bolts holding the fan and fan plate to
the machine (Figure 67).
Figure 67
1. Oil cooler
3. Fan plate
2. Fan 4. Alternator belt
7. Loosen the bottom bolt and remove the upper bolt
holding the alternator and cover (Figure 68).
8. Rotate the alternator cover to the side and remove
the belt from the pulleys and alternator.
9. Install a new belt around the pulleys and the
alternator (Figure 68).
10. Install the fan and fan plate to the machine with the
2 bolts previously removed (Figure 67).
11. Install the oil cooler with the 4 bolts previously
removed (Figure 67).
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