Toro Z449 Z Master - Cooling System Maintenance

Figure 45
1. Slotted Nut 3. Hole in threaded shaft
2. Two threads or less
showing
4. Washer (if needed)
5. Chec k the distance from bottom of slot in n ut
to inside edg e of hole . T w o threads or less
should be sho wing ( Figure 45 ).
6. If more than tw o threads are sho wing remo v e
n ut and install w asher betw een hub and n ut.
7. T or que the slotted n ut to 125 ft-lb . (170 N•m)
( Figure 45 ).
8. Tighten the n ut until the next set of slots line
up with the hole in the shaft ( Figure 45 ).
9. R e place the cotter pin.
Adjusting the Caster Pivot
Bearing
Chec k after ev er y 500 operating hours or at
storag e , whic h ev er comes first.
1. Diseng ag e the PTO , mo v e the motion control
lev ers to the neutral loc k ed position and set
the parking brak e .
2. Stop the engine , remo v e the k ey , and w ait for
all mo ving par ts to stop before lea ving the
operating position.
3. R emo v e the dust cap from caster and tighten
loc k n ut ( Figure 46 ).
4. Tighten the loc kn ut until the spring w ashers
are flat and then bac k off a 1/4 tur n to properly
set the pre-load on the bearings ( Figure 46 ).
Important: Mak e sur e spring w asher s
ar e installed cor r ectl y as sho wn in
Figur e 46 .
5. Install the dust cap ( Figure 46 ).
Figure 46
1. Spring Washers
3. Dust Cap
2. Lock Nut
Cooling System
Maintenance
Cleaning the Air Intake
Screen
Before eac h use remo v e any build-up of g rass , dir t
or other debris from the cylinder and cylinder head
cooling fins , air intak e screen on flywheel end, and
carburetor -g o v er nor lev ers and linkag e . T his will
help insure adequate cooling and cor rect engine
speed and will reduce the possibility of o v erheating
and mec hanical damag e to the engine .
Cleaning the Cooling System
Clean the air intak e screen from g rass and debris
before eac h use .
Chec k and clean cooling fins and engine shrouds
ev er y 100 hours or yearly , whic h ev er comes first.
1. Diseng ag e the PTO and set the parking brak e .
2. Stop the engine , remo v e the k ey , and w ait for
all mo ving par ts to stop before lea ving the
operating position.
3. R emo v e the air intak e screen, recoil star ter and
fan housing ( Figure 47 ).
4. Clean the debris and g rass from the engine
par ts .
5. Install air intak e screen, recoil star ter and fan
housing ( Figure 47 ).
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