Troubleshooting - Yard-Man 12A-559K401 Operator's Manual

SECTION 11: TROUBLE-SHOOTING GUIDE
PROBLEM
Engine fails to start 1. Blade control handle disengaged
2. Spark plug wire disconnected
3. Fuel tank empty, or stale fuel
4. Blocked fuel line
5. Faulty spark plug
6. Engine flooded
Engine runs erratic 1. Spark plug wire loose
2. Blocked fuel line or stale fuel
3. Vent in gas cap plugged
4. Water or dirt in fuel system
5. Dirty air cleaner
Engine overheats 1. Engine oil level low
2. Air flow restricted
Occasional skip 1. Spark plug gap too close
(hesitates) at high
speed
Idles poorly 1. Spark plug fouled, faulty, or gap too wide
2. Dirty air cleaner
Excessive vibration 1. Cutting blade loose or unbalanced
2. Bent cutting blade
3. Bent engine crankshaft
Mower will not 1. Engine speed too low
mulch grass 2. Wet grass
3. Excessively high grass
4. Dull blade
Uneven cut 1. Wheels not in same height position
2. Dull blade
POSSIBLE CAUSE
17
CORRECTIVE ACTION
1. Engage blade control handle
2. Connect wire to spark plug
3. Fill up tank with fresh gasoline
4. Clean fuel line
5. Clean, adjust gap, or replace
6. Wait a few minutes to restart, Do not
prime.
1. Connect and tighten spark plug wire.
2. Clean fuel line, fill tank with clean,
fresh gasoline.
3. Clear vent.
4. Drain fuel tank. Refill with fresh fuel.
5. Clean air cleaner. Refer to engine
manual.
1. Fill crankcase with proper oil.
2. Clean lawn mower engine.
1. Adjust gap to.030 inches.
1. Reset gap to.030 inches or replace
spark plug.
2. Clean air cleaner.
1. Tighten blade and adapter, balance
blade.
2. Replace blade.
3. Contact your nearest service center
1. Wait until grass is dry to cut.
2. Mow once at a high cutting height,
then mow again at desired height.
3. Sharpen or replace blade.
1. Reposition all wheels at same height.
2. Sharpen or replace blade.