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SECTION12: TROUBLESHOOTING
Trouble
Engine fails to start
Engine runs erratic
Possible Cause(s)
PTO (Blade Engage) lever engaged.
Parking brake not engaged.
Spark plug wire disconnected.
Throttle/choke control not in correct
starting position.
Choke not activated
Fuel tank empty, or stale fuel.
Blocked fuel line.
Faulty spark plug.
Engine flooded.
Unit running with CHOKE activated.
Spark plug wire(s) loose.
Blocked fuel line or stale fuel.
Vent in gas cap plugged.
Water or dirt in fuel system.
Dirty air cleaner.
Engine overheats Engine oil level low.
Air flow restricted.
Engine hesitates at high RPM
Idles poorly
Excessive vibration
Mower will not mulch grass
Spark plug gap too close.
Spark plug fouled, faulty or gap too
wide.
Dirty air cleaner.
Cutting blade loose or unbalanced.
Damaged or bent cutting blade.
Engine speed too low.
Wet grass.
Excessively high grass.
Dull blade.
Uneven cut Deck not balanced properly.
Dull blade.
Uneven tire pressure.
Corrective Action
Place PTO (Blade Engage) lever in (OFF) position.
Engage parking brake.
Connect wire to spark plug.
Move Throttle/Choke Control into CHOKE position.
Move Throttle/Choke Control into CHOKE position.
Fill tank with clean, fresh (less than 30 days old) gas.
Clean fuel line or replace fuel filter.
Clean, adjust gap or replace plug.
Crank engine with throttle in FAST position.
Move Throttle/Choke Control out of CHOKE position.
Connect and tighten spark plug wire(s).
Clean fuel line; fill tank with clean, fresh (less than 30
days old) gasoline. Replace fuel filter, if so equipped.
Clear vent or replace cap if damaged.
Drain fuel tank. Refill with clean, fresh (less than 30
days old) gasoline.
Replace air cleaner paper element or clean foam
precleaner.
Fill crankcase with proper capacity and weight of oil.
Clean grass clippings and debris from around the
engine's cooling fins and blower housing.
Remove spark plug and reset the gap.
Replace spark plug. Set plug gap.
Replace air cleaner element or clean pre-cleaner.
Tighten blade and spindle. Balance blade.
Replace blade.
Place throttle in FAST (rabbit) position.
Do not mow when grass is wet; wait until later to cut.
Mow once at a high cutting height, then mow again at
desired height or make a narrower cutting swath.
Sharpen or replace blade.
Perform side-to-side deck adjustment.
Sharpen or replace blade.
Check tire pressure in all four tires.
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