Adjusting The Electric Clutch; Cooling System Maintenance; Cleaning The Air Intake Screen; Cleaning The Cooling System - Toro 74549 Operator's Manual

2. Remove one bushing, then pull the spanner bushing
and roller bearing out of the wheel hub (Figure 61).
3. Remove the other bushing from the wheel hub
and clean any grease and dirt from the wheel hub
(Figure 61).
4. Inspect the roller bearing, bushings, spanner bushing
and inside of the wheel hub for wear. Replace any
defective or worn parts (Figure 61).
5. To assemble, place one bushing into the wheel hub.
Grease the roller bearing and spanner bushing and slide
them into the wheel hub. Place the second bushing
into the wheel hub (Figure 61).
6. Install the caster wheel into the caster fork and secure
with the wheel bolt and locknut. Tighten the locknut
until the spanner bushing bottoms against the inside of
the caster forks (Figure 61).
7. Grease the fitting on the caster wheel.

Adjusting the Electric Clutch

Service Interval: Every 100 hours—Check the electric
clutch.
The clutch is adjustable to ensure proper engagement and
proper braking.
1. Insert a 0.015–0.021 inch (0.381-0.533 mm) feeler
gauge through one inspection slot in the side of the
assembly. Make sure it is between the armature and
the rotor friction surfaces.
The gap needs to be at least .015 inches (0.381 mm)
and not more than .021 inches (0.533 mm).
2. If adjustment is needed, use a .015 inch (0.381 mm)
feeler gauge to set each of the three adjustment slot
positions. Tighten the lock nuts until there is slight
binding on the feeler gauge but it can be moved easily
within the air gap (Figure 62).
3. Repeat this for the remaining slots.
4. Check each slot again and make slight adjustments until
the feeler gauge between the rotor and armature with
very slight contact between them.
Figure 62
1. Adjusting nut
2. Slot
3. Feeler gauge
Cooling System
Maintenance

Cleaning the Air Intake Screen

Service Interval: Before each use or daily
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

Service Interval: Every 100 hours—Check and clean engine
cooling fins and shrouds.
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 and fan housing
(Figure 63).
4. Clean the debris and grass from the engine parts.
5. Install air intake screen, recoil starter and fan housing
(Figure 63).
1. Guard and engine air
intake screen
Cleaning the Hydraulic Oil
Cooler (52 and 60 inch Mower
Models Only)
Service Interval: Before each use or daily
Before each use remove any build-up of grass, dirt or other
debris from the hydraulic oil cooler and fan. This will help
insure adequate cooling and correct engine speed and will
reduce the possibility of overheating and mechanical damage
to the engine.
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Figure 63
2. Fan housing