Checking The Wheel Hub Slotted Nut; Adjusting The Caster Pivot Bearing; Servicing The Gear Box - Toro 74253 Operator's Manual

Checking the Wheel Hub
Slotted Nut
Service Interval: Every 100 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/Yearly (whichever
comes first)
1. Disengage the PTO, move the motion control levers
to the neutral locked position and set the parking
brake.
Figure 48
3. Hole in threaded shaft
4. Washer (if needed)
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 49).
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 49).
Important: Make sure spring washers are
installed correctly as shown in Figure 49.
5. Install the dust cap (Figure 49).
1. Spring Washers
2. Lock Nut

Servicing the Gear Box

Checking the Gear Box Oil Level
Service Interval: Every 100 hours
Yearly
Use SAE 75W–90 Synthetic Gear Lube.
1. Park the machine on a level surface.
2. Disengage the PTO, move the motion control levers
to the neutral locked position and set the parking
brake.
3. Stop the engine, remove the key, and wait for all
moving parts to stop before leaving the operating
position.
4. Loosen the lug nuts on the right rear wheel.
5. Raise rear of the machine so the right rear wheel is
off the ground and support the machine with jack
stands.
40
Figure 49
3. Dust Cap