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EQUIPMENT AFFECTING ENGINE OPERATION
Frequently, what appears to be a problem with
engine operation, such as hard starting or
vibration, may be the fault of the equipment
rather than the engine itself. Below are some
common symptoms and potential equipment-
related sources.
Hard Starting or Will Not Start
1. Check for a loose drive belt or a loose
blade, which will counteract engine
cranking effort.
2. Check for parasitic load; disengage
equipment controls before starting.
3. Check remote throttle/choke control for
proper adjustment.
4. Check interlock system for shorted wires,
loose or corroded connections, or
defective modules or switches.
Engine Won’t Stop
1. Check equipment stop switch.
2. Check for loose or disconnected
equipment stop switch wire.
3. Check engine ground wire harness.
Vibration
1. Check for bent or out-of-balance cutter
blades.
2. Check for loose, worn, or damaged drive
belts and pulleys.
3. Check for loose mounting bolts.
OIL GARD SYSTEMS
Engine Will Not Start, On/Off Switch Light
Flashes
1. Check engine oil level. If oil is between
ADD and FULL, go to next step. If low,
add oil to bring to FULL mark on dipstick.
If engine starts and runs, problem
corrected.
2. Disconnect wire from module to plug and
terminal assembly on crankcase cover.
Use Digital Multimeter #19464 to check
resistance.
3. Rotate selector to (Ohms) position.
4. Insert RED test lead into the V Ω
receptacle in the meter.
5. Insert BLACK test lead (B) into COM
receptacle.
6. Connect either test lead to plug and
terminal.
7. Connect other test lead to crankcase
cover (Figure 41). If meter reads Zero
resistance, replace sensor in crankcase
cover. If meter reads some resistance, go
to next step.
Figure 41
8. With module wire disconnected and not
touching ground, try to start the engine. If
engine starts, replace module. If engine
does not start, check Oil Gard wiring for
shorts to ground. Repair as needed.