Adjusting The Caster Pivot; Bearing; Cooling System Maintenance; Cleaning The Air Intake Screen - Toro Z453 Z Master 74416TE Operator's Manual

Figure 47
1. Slotted Nut
2. Two threads or less
showing
5. Check the distance from bottom of slot in nut
to inside edge of hole. Two threads or less
should be showing (Figure 47).
6. If more than two threads are showing remove
nut and install washer between hub and nut.
7. Torque the slotted nut to 125 ft-lb. (170 N•m)
(Figure 47).
8. Tighten the nut until the next set of slots line
up with the hole in the shaft (Figure 47).
9. Replace the cotter pin.

Adjusting the Caster Pivot

Bearing

Check after every 500 operating hours or at
storage, which ever comes first.
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 dust cap from caster and tighten
lock nut (Figure 48).
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 48).
Important: Make sure spring washers
are installed correctly as shown in
Figure 48.
5. Install the dust cap (Figure 48).
3. Hole in threaded shaft
4. Washer (if needed)
Figure 48
1. Spring Washers
2. Lock Nut
Cooling System
Maintenance
Cleaning the Air Intake
Screen
Before each use remove any build-up of grass, dirt
or other debris from the cylinder and cylinder head
cooling fins, air intake screen on flywheel end, and
carburetor-governor levers and linkage. This will
help insure adequate cooling and correct engine
speed and will reduce the possibility of overheating
and mechanical damage to the engine.

Cleaning the Cooling System

Clean the air intake screen from grass and debris
before each use.
Check and clean cooling fins and engine shrouds
every 100 hours or yearly, which ever comes first.
1. Disengage the PTO 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 air intake screen, recoil starter and
fan housing (Figure 49).
38
3. Dust Cap