Troubleshooting - Yard-Man 550 Series Operator's Manual

SECTION 9: TROUBLE-SHOOTING
Problem Possible Cause Corrective Action
Engine fails to start
Engine runs erratic
Engine overheats
Occasional skip Spark plug gap too close
(hesitates) at high
speed
1. Blade control disengaged
2. Spark plug wire disconnected
3. Fuel tank empty, or stale fuel
4. Blocked fuel line
5. Faulty spark plug
6. Engine flooded
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
1. Engine oil level low
2. Air flow restricted
1.
1. Engage blade control.
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 gapto.030 inches.
Idles poorly 1. Spark plug faulty, or gap too wide 1. Reset gap to.030 inches or replace spark plug.
2. Dirty air cleaner 2. Clean air cleaner.
Excessive vibration 1. Blade loose or unbalanced 1. Tighten blade and adapter, balance blade.
2. Bent cutting blade 2. Replace blade.
3. Bent engine crankshaft 3. Contact the nearest service center
Mower will not 1. Wet grass 1.
mulch grass 2. Excessively high grass 2.
Uneven cut
Mower will not
self propel
3. Dull blade 3.
1. Wheels not at same height 1.
2. Dull blade 2.
1. Belt not installed properly. 1.
2. Debris clogging drive operation.
3. Damaged or worn belt.
,
,
NOTE: For repairs beyond the minor adjustments listed above,
Wait until grass is dry to cut.
Mow once at a high cutting height, then mow
again at desired height.
Sharpen or replace blade.
Reposition all wheels at same height.
Sharpen or replace blade.
Check belt for proper pulley installation and
movement.
Stop engine, disconnect spark plug wire and
clean out debris.
Inspect and replace belt.
contact your local authorized service dealer,
15