Servicing The Spark Plug; Cleaning The Cooling System - Toro 74730 Operator's Manual

Servicing the Spark Plug

Service Interval: Every 100 hours—Check the spark plug(s).
Make sure the air gap between the center and side electrodes
is correct before installing the spark plug. Use a spark plug
wrench for removing and installing the spark plug(s) and a
gapping tool/feeler gauge to check and adjust the air gap.
Install a new spark plug(s) if necessary.
Type: NGK BPR4ES (or equivalent)
Air Gap: 0.76 mm (0.030 inch)
Removing the Spark Plug
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.
A
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Figure 34
Note: Due to the deep recess around the spark plug,
blowing out the cavity with compressed air is usually
the most effective method for cleaning. The spark plug
is most accessible when the blower housing is removed
for cleaning.
Checking the Spark Plug
Important: Never clean the spark plug(s). Always
replace the spark plug(s) when it has: a black coating,
worn electrodes, an oily film, or cracks.
If you see light brown or gray on the insulator, the engine is
operating properly. A black coating on the insulator usually
means the air cleaner is dirty.
Set the gap to 0.76 mm (0.030 inches).
A
Figure 35
B
B
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Installing the Spark Plug
Tighten the spark plug(s) to 22 N-m (16 ft-lb).
A
C
16 ft-lb
22 N-m

Cleaning the Cooling System

Clean the air intake screen from grass and debris before each
use.
1. Disengage the blade control switch and move the
control levers to the neutral locked position and apply
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, air cleaner cover, and fan
housing.
4. Clean debris and grass from the parts.
5. Install the air intake screen, air cleaner cover, and fan
housing.
32
B
D
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Figure 36