Checking The Wheel Hub Slotted Nut; Adjusting The Caster Pivot Bearing - Toro 74410 Operator's Manual

Check the pressure at the valve stem after every
50 operating hours or monthly, whichever occurs first
(Figure 43).
Maintain the air pressure in the front and 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.
Checking the Wheel Hub
Slotted Nut
Service Interval: Every 500 hours
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)
(Figure 44).
Figure 43
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 44).
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 44).
8. Tighten the nut until the next set of slots line up with
the hole in the shaft (Figure 44).
9. Replace the cotter pin.
Adjusting the Caster Pivot
Bearing
Service Interval: Every 500 hours
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 the dust cap from caster and tighten lock
nut (Figure 45).
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 45).
Important: Make sure spring washers are
installed correctly as shown in Figure 45.
5. Install the dust cap (Figure 45).
36
Figure 44
3. Hole in threaded shaft
4. Washer (if needed)