Adjusting The Caster Pivot; Bearing; Cooling System Maintenance; Cleaning The Engine Screen And The Oil Cooler - Toro 74255 Operator's Manual

Figure 50
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 50).
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 50).
8. Tighten the nut until the next set of slots line
up with the hole in the shaft (Figure 50).
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 51).
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 51).
Important: Make sure spring washers
are installed correctly as shown in
Figure 51.
5. Install the dust cap (Figure 51).
3. Hole in threaded shaft
4. Washer (if needed)
Figure 51
1. Spring Washers
2. Lock Nut
Cooling System
Maintenance
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 and engine air
intake screen (Figure 52).
Figure 52
1. Engine screen

Cleaning the Engine Fins

Every 100 hours clean engine cylinder and cylinder
head cooling fins. Also clean around carburetor,
42
3. Dust Cap
2. Oil cooler