Toro Z555 74245 - Cleaning the Cooling Systems; Checking the Tire Pressure; Checking the Wheel Hub Slotted Nut

36
Cleaning the Cooling Systems
Cleaning the Engine Screen and the Oil
Cooler
Before each use, check and clean engine screen and oil
cooler. Remove any build–up of grass, dirt or other debris
from the oil cooler screen and engine screen (Figures 45
and 46).
m–5800
1
Figure 45
1. Oil cooler
Cleaning the Engine Fins
Every 100 hours clean engine cylinder and cylinder head
cooling fins. Also clean around carburetor, governor
levers and linkage. This will make sure adequate cooling
to hydraulic pumps, motors and engine and will reduce the
possibility of overheating and mechanical damage.
1. Remove the engine shroud.
2. Clean the engine cooling fins.
3. Install the engine shroud.
1
2
m–7300
Figure 46
1. Engine shroud 2. Engine screen
Checking the 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. 47). Check the tires when they are cold to get the
most accurate pressure reading.
Pressure: 13 psi (90 kPa) drive wheels and caster wheels.
1
m–1872
Figure 47
1. Valve stem
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. 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) (Fig. 48).
3
m–4638
1
2
4
Figure 48
1. Slotted Nut
2. Two threads or less
showing
3. Hole in threaded rod
4. Washer (if needed)
5. Check the distance from bottom of slot in nut to inside
edge of hole. Two threads or less should be showing
(Fig. 48).