Checking The Tire Pressure; Checking The Wheel Hub Slotted Nut; Adjusting The Caster Pivot Bearing - Toro 74239 Operator's Manual

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. 47). Check the tires when they are cold to get the
most accurate pressure reading.
Pressure: 13 psi (90 kPa) drive wheels and caster wheels.
Figure 47
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 the cotter pin.
4. Torque the slotted nut to 125 ft–lb (170 N m) (Fig. 48).
4
2
Figure 48
1. Slotted Nut
2. Two threads or less
showing
1
m–1872
1
3
m–4638
3. Hole in threaded rod
4. Washer (if needed)
37
5. Check the distance from bottom of slot in nut to inside
edge of hole. Two threads or less should be showing
(Fig. 48).
6. If more than two threads are showing remove nut and
install washer between hub and nut (Fig. 48).
7. Torque the slotted nut to 125 ft–lb. (170 N m)
(Fig. 48).
8. Tighten nut until the next set of slots line up with the
hole in the shaft (Fig. 48).
9. Replace cotter pin.
Adjusting the Caster Pivot
Bearing
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. 49).
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. 49).
Important
Make sure spring washers are installed
correctly as shown in figure 49.
5. Install the dust cap (Fig. 49).
Figure 49
1. Spring Washers
2. Lock Nut
3
2
1
M–4640
3. Dust Cap