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

• Change oil if it has not been changed in the last
three months. For instructions on how to change oil,
refer to the engine manual.
• Clean engine and remove any grass clippings.
Other
• Do not store gasoline from one season to another.
SECTION 9: TROUBLE-SHOOTING
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 faulty, or gap too wide
2. Dirty air cleaner
Excessive vibration 1. Blade loose or unbalanced
2. Bent cutting blade
3. Bent engine crankshaft
Mower will not 1. Wet grass
mulch grass 2. Excessively high grass
3.
4. Dull blade
Uneven cut 1. Wheels not at same height
2. Dull blade
NOTE: For repairs beyond the minor adjustments listed above, contact your local authorized service dealer.
Possible Cause
15
• Replace your gasoline can if it starts to rust. Rust
and/or dirt in the gasoline will cause problems.
Store unit in a clean, dry area. Do not store next to
corrosive materials, such as fertilizer.
NOTE: If storing in an unventilated or metal storage
shed, be certain to rustproof the equipment by coating
with a light oil or silicone.
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 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 the 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.