Adjusting The Castor Pivot Bearing; Checking The Wheel Hub Slotted Nut; Adjusting The Mower Level - Toro 74179 Operator's Manual

Warning
Electrical system will not perform proper safety
shut off with jumper wire installed.
Remove jumper wire from wire harness
connector and plug connector into seat switch
when adjustment is completed.
Never operate this unit with jumper installed
and seat switch bypassed.
10. Shut off the unit. Remove the jumper wire from the
wire harness connector and plug the connector into the
seat switch.
11. Install the prop rod and lower the seat.
Adjusting the Castor Pivot
Bearing
Check after every 500 operating hours or at storage,
whichever occurs first.
1. Stop the engine, set the parking brake, remove the key,
and disconnect the spark plug wire(s) from the spark
plug(s).
2. Remove the dust cap from the castor and tighten the
locknut (Fig. 48).
3. Tighten until the spring washers are flat and then back
off 1/4 turn to properly set the preload on the bearings
(Fig. 48).
Important
Make sure that the spring washers are
installed correctly as shown in Figure 48.
Figure 48
1. Spring washers
2. Locknut
3
2
1
m–4640
3. Dust cap
38
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. Stop the engine, set the parking brake, remove the key,
and disconnect the spark plug wire(s) from the spark
plug(s).
2. Remove the cotter pin.
3. Torque the slotted nut to 125 ft.-lb. (170 N m) (Fig. 49).
4. Check the distance from the bottom of the slot in the
nut to the inside edge of the hole. Two threads or less
should be showing (Fig. 49).
5. If more than two threads are showing, remove the nut
and install a washer between the hub and nut (Fig. 49).
6. Torque the slotted nut to 125 ft.-lb. (170 N m) (Fig. 49).
7. Tighten the nut until the next set of slots line up with
the hole in the shaft (Fig. 49).
8. Install the cotter pin.
4
5
2
Figure 49
1. Slotted nut
2. Two threads or less
showing

Adjusting the Mower Level

1. Position the mower on a flat surface. Stop the engine,
set the parking brake, remove the key, and disconnect
the spark plug wire(s) from the spark plug(s).
2. Check the tire pressure of all 4 tires. If needed, adjust to
13 psi (90 kPa).
3. Set the anti-scalp rollers to the top holes or remove
them completely for this adjustment.
4. Raise the deck to the transport position (Fig. 50). Take
force off of the two large deck lift springs by loosening
the jam nut and front spring nut, in front of each spring,
as far as possible (Fig. 51).
1
3
m–4638
3. Hole in threaded shaft
4. Washer (if needed)
5. Slot