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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: 0.030 inch (0.75 mm)
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.
3. Pull the wire(s) off the spark plug(s) (Figure 33).
Now clean around the spark plug(s) to prevent
dirt from falling into the engine and potentially
causing damage.
4. Remove the spark plug(s) and metal washer.
Figure 33
1. Spark plug wire
2. Spark plug
Checking the Spark Plug
1. Look at the center of the spark plug(s)
(Figure 34). 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.
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.
Figure 34
1. Canter electrode insulator
3. Air gap (not to scale)
2. Side electrode
2. Check the gap between the center and side
electrodes (Figure 34). Bend the side electrode
(Figure 34) if the gap is not correct.
Installing the Spark Plug
1. Install the spark plug(s). Make sure the air gap
is set correctly.
2. Tighten the spark plug(s) to 16 ft.-lb (22 N
⋅
m).
3. Push the wire(s) onto the spark plug(s)
Fuel System
Maintenance
Replacing the Fuel Filter
Replace the fuel filter after every 200 operating
hours or yearly, whichever occurs first.
Never install a dirty filter if it is removed from the
fuel line.
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. Allow the engine to cool down.
4. Close the fuel shut-off valve (Figure 35).
32
Summary of Contents for 74237
Page 7: ...Slope Chart 7...
Page 10: ...107 1860 107 1861 107 1864 107 2102 10...
Page 12: ...106 7492 106 9989 107 8076 1 Fast 2 Slow 3 Neutral 4 Reverse 12...
Page 56: ...Schematics Wire Diagram Rev A 56...
Page 57: ......
Page 58: ......