Toro 74242 Z500 Z Master - Chassis and Hydraulic System Maintenance; Checking the Tire Pressure; Checking the Wheel Hub Slotted Nut; Caster Pivot Bearing Adjustment

37
Checking the Tire Pressure
Maintain the air pressure in the front and rear tires as
specified. Uneven tire pressure can cause uneven cut.
Check the pressure at the valve stem after every
50 operating hours or monthly, whichever occurs first
(Fig. 48). Check the tires when they are cold to get the
most accurate pressure reading.
Pressure: 13 psi (90 kPa) drive wheels and caster wheels.
1
m–1872
Figure 48
1. Valve stem
Checking the Wheel Hub
Slotted Nut
Check after every 500 operating hours.
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 cotter pin.
4. Torque slotted nut to 125 ft–lb (170 N m) (Fig. 49).
5. Check the distance from bottom of slot in nut to inside
edge of hole. Two threads or less should be showing
(Fig. 49).
6. If more than two threads are showing remove nut and
install washer between hub and nut (Fig. 49).
7. Torque the slotted nut to 125 ft–lb (170 N m)
(Fig. 49).
8. Tighten nut until the next set of slots line up with the
hole in the shaft (Fig. 49).
9. Replace cotter pin.
3
m–4638
1
2
4
Figure 49
1. Slotted nut
2. Two threads or less
showing
3. Hole in threaded rod
4. Washer (if needed)
Caster Pivot Bearing
Adjustment
Check after every 500 operating hours or at storage, 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 dust cap from caster and tighten lock nut
(Fig. 50).
4. Tighten until spring washers are flat and then back off
a 1/4 turn to properly set the pre–load on the bearings
(Fig. 50).
Important Make sure spring washers are installed
correctly as shown in figure 50.
1
M–4640
2
3
Figure 50
1. Spring Washers
2. Lock nut
3. Dust Cap