Checking The Tire Pressure; Checking The Wheel Hub Slotted Nut; Adjusting The Caster Pivot Bearing - Toro 74253 Operator's Manual

Figure 46
1. Tracking knob
2. Hydraulic tank
3. Hydraulic pumps

Checking the Tire Pressure

Service Interval: Every 50 hours (or monthly, which
ever 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 47
4. Turn this way to track right
5. Turn this way to track left
Checking the Wheel Hub
Slotted Nut
Service Interval: Every 500 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 the cotter pin.
4. Torque the slotted nut to 125 ft-lb (170 N•m)
(Figure 48).
1. Slotted Nut
2. Two threads or less
showing
5. Check the distance from bottom of slot in nut to
inside edge of hole. Two threads or less should be
showing (Figure 48).
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 48).
8. Tighten the nut until the next set of slots line up with
the hole in the shaft (Figure 48).
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.
38
Figure 48
3. Hole in threaded shaft
4. Washer (if needed)