Electronic Fuel Injection System; Fuel Filters - Toro 74241 Operator's Manual

2
Figure 28
1. Spark plug wire
Checking the Spark Plug
1. Look at the center of the spark plug(s) (Fig. 29). 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.
2. Check the gap between the center and side electrodes
(Fig. 29). Bend the side electrode (Fig. 29) if the gap is
not correct.
2
1
Figure 29
1. Center electrode insulator
2. Side electrode
1
m–4811
2. Spark plug
3
0.030 in.
(0.76 mm)
m–3215
3. Air gap (not to scale)
35
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 20 ft-lb (27 N m).
3. Push the wire(s) onto the spark plug(s) (Fig. 28).
Electronic Fuel Injection
System
This machine contains an electronic fuel injection system.
It controls the fuel flow under different operating
conditions.
Malfunction Indicator Light
If the malfunction indicator light (MIL) illuminates the
electronic control unit (ECU) has detected a problem or
fault in the electronic fuel injection (EFI) system.
Once the MIL illuminates, initial trouble shooting checks
should be made. Refer to Troubleshooting on page 54
under the MIL section.
If these checks do not correct the problem, further
diagnosis and servicing by an Authorized Service Dealer
is necessary.

Fuel Filters

Important
Removal of hose clamps requires special
pliers. Contact an Authorized Kohler Service Dealer for
ordering pliers.
Replacing the Low Pressure Fuel Filter
Replace the low pressure 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 power take off (PTO) and turn the
ignition key to "OFF" to stop the engine. Move levers
to neutral locked position and apply parking brake.
Remove the key.
2. Close fuel shut off valve on console.
3. Remove clamps with special pliers (Fig. 30).
(s)