Bolens 18M Servicehandbuch

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For repairs beyond 
the minor adjust-
ments listed here, 
contact an autho-
rized service dealer. 
6
Trouble 
Shooting
Cause
Problem
Remedy
Engine fails to start
1.  Blade control handle disengaged.
2.  Spark plug wire disconnected.
3.  Fuel tank empty or stale fuel.
4.  CHOKE not activated. 
5.  Faulty spark plug.
6.  Blocked fuel line.
7.  Engine flooding.
1.  Engage blade control handle.
2.  Connect wire to spark plug.
3.  Fill tank with clean, fresh gasoline.
4.  Choke engine as instructed in 
“Operating Your Lawn Mower”.
5.  Clean, adjust gap, or replace.
6.  Clean fuel line.
7.  Wait a few minutes to restart, but do not 
Engine runs erratic
1.  Connect and tighten spark  
plug wire.
2.  Clean fuel line; fill tank with clean, fresh 
gasoline.
3.  Clear vent.
4.  Drain fuel tank and carburetor. Refill with 
fresh fuel.
5.  Refer to engine maintenance section.
6.  Push CHOKE knob in.
1.  Spark plug wire loose. 
2.  Blocked fuel line or stale fuel. 
3.  Gas cap vent plugged.
4.  Water or dirt in fuel system. 
5.  Dirty air cleaner.
6.  Unit running with CHOKE applied.
Engine overheats
1.  Fill crankcase with proper oil.
2.  Remove blower housing and clean.
1.  Engine oil level low.
2.  Air flow restricted.
Occasional skip 
(hesitates) at high speed
1.  Adjust gap to .030”. Refer to engine 
manual.
1.  Spark plug gap too close.
Idles poorly
1.  Reset gap to .030” or replace spark plug. 
Refer to engine manual.
2.  Refer to engine maintenance section.
1.  Spark plug fouled, faulty or gap too 
wide.
2.  Dirty air cleaner.
1.  Cutting Blade loose or unbalanced.
2.  Bent cutting blade.
1.  Tighten blade and adapter. Balance blade
2.  See an authorized service dealer.
Excessive vibration
1.  Dull blade.
Uneven cut
1.  Sharpen or replace blade.
1.  Wet grass. 
2.  Excessive high grass. 
 
3.  Dull blade.
1.  Do not mow when grass is wet; 
wait until later to cut.
2.  Mow once at a high cutting height, then 
mow again at desired height or make a 
narrower cutting path.
3.  Sharpen or replace blade.
Mower will not mulch 
grass