Cleaning The Cooling Systems; Tire Pressure; Wheel Hub Slotted Nut - Toro Z255 Operator's Manual

Cleaning the Cooling Systems

Before each use, check and clean cooling screen.
Remove any build–up of grass, dirt or other debris
from the oil cooler screen and engine air intake.
Every 100 hours clean oil cooler, engine cylinder and
cylinder head cooling fins. Also clean around
carburetor, governor levers and linkage. This will
help insure adequate cooling to hydraulic pumps,
motors and engine and will reduce the possibility of
overheating and mechanical damage.
2
Figure 35
1. Engine screen

Tire Pressure

Maintain the air pressure in the front and rear tires as
specified. Uneven tire pressure can cause uneven cut.
Check the pressure at the valve stem after every 50
operating hours or monthly, whichever occurs first
(Fig. 36). Check the tires when they are cold to get
the most accurate pressure reading.
Pressure: 13 psi (90 kPa) drive wheels and castor
wheels.
Figure 36
1. Valve stem
1
Ó Ó
Ó Ó
Ó Ó
Ó Ó
Ó Ó
m–3801
2. Oil cooler
1
m–1872

Wheel Hub Slotted Nut

Check after every 500 operating hours.
The slotted nut needs to be torqued to 125 ft–lbs
(169.5 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 cotter pin.
3. Torque slotted nut to 125 ft–lbs (169.5 N m)
(Fig. 37).
4. Check the distance from bottom of slot in nut to
inside edge of hole. Two threads or less should
be showing (Fig. 37).
5. If more than two threads are showing remove nut
and install washer between hub and nut
(Fig. 37).
6. Torque the slotted nut to 125 ft–lbs (169.5 N m)
(Fig. 37).
7. Tighten nut until the next set of slots line up
with the hole in the shaft (Fig. 37).
8. Replace cotter pin.
4
5
2
Figure 37
1. Slotted Nut
2. Two threads or less
showing
Maintenance
1
3
3. Hole in threaded shaft
4. Washer (if needed)
5. Slot
47