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

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. 51).
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. 51).
5. If more than two threads are showing, remove the nut
and install a washer between the hub and nut (Fig. 51).
6. Torque the slotted nut to 125 ft–lb (170 N m) (Fig. 51).
7. Tighten the nut until the next set of slots line up with
the hole in the shaft (Fig. 51).
8. Install the cotter pin.
4
5
2
Figure 51
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.
1
3
m–4638
3. Hole in threaded shaft
4. Washer (if needed)
5. Slot
40
4. Raise the deck to the transport position (Fig. 52). 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. 53).
5. Place 2 thick blocks (1-1/4 inch [35 mm]) under the rear
left and right lower edge of the mower. Place 1 block
(1-3/8 inch [44 mm]) under the front center lower edge
of the mower, not under the anti-scalp roller brackets.
Lower the mower to the 1-1/2 inch (38 mm)
height-of-cut position (Fig. 52).
Figure 52
1. Transport position
6. Loosen the bottom chain bolt in the slot at the rear of
the deck. Repeat for the opposite side (Fig. 53).
Note: Do not loosen the front chain hardware.
7. Loosen the front and rear locking nut on either side of
the front swivel. Loosen until the front chains are loose
and the deck is supported by blocks. Repeat for the
opposite side. (Fig. 53).
Note: When the hardware is loose, the deck will rotate the
lift handle up, out of position.
8. When the hardware is loosened, the remaining tension
in the large support springs will tend to rotate the deck
lift handle up, out of the 1-1/2 inch (38 mm) position.
Press down on the rear deck support arm to firmly
return the deck lift handle to the 1-1/2 inch (38 mm)
position (Fig. 53).
Note: Do not push on the deck lift handle.
9. While continuing to press down on the rear deck
support arm, take the slack out of the rear chain and
tighten the hardware at the bottom (Fig. 53). Downward
pressure may now be released. Repeat for the opposite
side.
1
2
m–4122
2. 1-1/2 inch (38 mm)
height-of-cut