Troubleshooting - Yard-Man 604 Operator's Manual

SECTION 11: TROUBLESHOOTING
Trouble
Engine fails to start
Engine runs erratic
Engine overheats
Engine hesitates at high RPM Spark plug(s) gap too close.
Idles poorly
Excessive vibration
Mower will not mulch grass
Uneven cut
Possible Cause(s)
PTO engaged.
Parking brake not engaged.
Spark plug wire(s) disconnected.
Throttle control lever 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 applied.
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 oil level low.
Air flow restricted.
Spark plug(s) 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.
Deck not balanced properly.
Dull blade.
Uneven tire pressure.
Corrective Action
Place PTO lever in disengaged (OFF)
position.
Engage parking brake.
Connect wire(s) to spark plug(s).
Place throttle lever to FAST position.
Pull out the CHOKE control (if so equipped) or place the
throttle control in CHOKE position.
Fill tank with clean, fresh (less than 30 days old) gas.
Clean fuel line or replace fuel filter, if so equipped.
Clean, adjust gap or replace plug.
Crank engine with throttle in FAST position.
Push CHOKE control (if so equipped) in, or move the
throttle control out of the 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 cartridge/element or clean pre-
cleaner, if so equipped.
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(s) and reset the gap.
Replace spark plug(s). Set plug(s) gap.
Replace air cleaner cartridge/element or clean pre-
cleaner, if so equipped.
Tighten blade and spindle. Balance blade.
Replace blade.
Place throttle control 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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