Checking The Wheel Hub Slotted Nut; Adjusting The Caster Pivot Bearing - Toro 78922 Operator's Manual

Figure 61
Checking the Wheel Hub
Slotted Nut
Service Interval: After the first 100 hours
Every 500 hours
See Figure 62 to determine which slotted nut has been
installed on the unit.
Figure 62
1. Style A (black finish)
2. .03 inch (.76 mm)
• Style A (black finish):
Torque the slotted nut to 211-260 ft-lb (286-352
N-m).
Note: Do Not use anti-seize on wheel hub.
• Style B (yellow zinc):
1. Remove and discard the cotter pin.
2. Torque the slotted nut to 200 ft-lb (271 N-m).
3. Check distance from bottom of slot in nut to
inside edge of hole. Two threads (0.1 inch) or
less should be showing.
3. Style B (yellow zinc)
4. .24 inch (6 mm)
1. 0.1 inch max
4. If more than two threads (0.1 inch) are showing
remove nut and install washer between hub and
nut.
5. Torque the slotted nut to 200 ft-lb (271 N-m).
6. Then tighten nut until the next set of slots line
up with the cross hole in shaft. Do not loosen
nut to align the slot. If required, tighten to the
next set of slots.
7. Install a new cotter pin.
Note: Do Not use anti-seize on wheel hub.
Adjusting the Caster Pivot
Bearing
Service Interval: Every 500 hours/Yearly (whichever
comes first)
1. Disengage the blade control switch (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 64).
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 64).
Important: Make sure the spring washers are
installed correctly as shown in Figure 64.
5. Install the dust cap (Figure 64).
43
Figure 63
2. No more than two threads
(0.1 inch max) should be
showing here.