Toro Z580-D, Operator'S Manual, Page: 42 / 68

Checking the Tire Pressure
Service Interval: Every 50 hours/Monthly (whichever
comes first)
Maintain the air pressure in the rear tires at 13 psi (90
kPa). Uneven tire pressure can cause uneven cut. Check
the tires when they are cold to get the most accurate
pressure reading.
Note:
The front tires are semi-pneumatic tires and do
not require air pressure maintenance.
Figure 50
Checking the Wheel Hub
Slotted Nut
Service Interval: After the first 100 hours—Check the
wheel hub slotted nut.
Every 500 hours—Check the wheel
hub slotted nut.
After the first 100 hours—Check the
wheel lug nuts.
Every 500 hours—Check the wheel
lug nuts.
The slotted nut needs to be torqued to 125 ft-lb
(170 N-m).
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 cotter pin.
4. Torque the slotted nut to 125 ft-lb (170 N-m)
(Figure 51).
Figure 51
1. Slotted Nut 3. Hole in threaded shaft
2. Two threads or less
showing 4. Washer (if needed)
5. Check the distance from bottom of slot in nut to
inside edge of hole. Two threads or less should be
showing (Figure 51).
6. If more than two threads are showing remove nut
and install washer between hub and nut.
7. Torque the slotted nut to 125 ft-lb. (170 N-m)
(Figure 51).
8. Tighten the nut until the next set of slots line up with
the hole in the shaft (Figure 51).
9. Replace the cotter pin.
Adjusting the Caster Pivot
Bearing
Service Interval: Every 500 hours (or yearly, which ever
comes first).
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 dust cap from caster and tighten lock
nut (Figure 52).
4. Tighten the locknut until the spring washers are flat
and then back off a 1/4 turn to properly set the
pre-load on the bearings (Figure 52).
Important:
Make sure spring washers are
installed correctly as shown in Figure 52.
5. Install the dust cap (Figure 52).
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