Bolens 120-280R000 - Manual (Page 17)

Trouble Shooting Guide
Trouble Possible Cause(s) Corrective Action
Engine fails to start 1. Blade control handle disengaged.
2. Spark plug wire disconnected.
3. Throttle control lever not in FAST
or START position.
4. Fuel tank empty, or stale fuel.
5. Blocked fuel line.
6. Faulty spark plug.
7. Engine flooded.
1. Engage blade control handle.
2. Connect wire to spark plug.
3. Move throttle lever to FAST or
START position.
4. Fill tank with clean, fresh gasoline.
5. Clean fuel line.
6. Clean, adjust gap or rep#»;e.
7. Remove spark plug, dry the plug,
and crank engine with plug re­
moved and throttle in off position.
Replace spark plug, connect wire
and resume starting procedures.
Engine runs erratic 1. Unit running in START
position.
2. Spark plug wire loose.
3. Blocked fuel line or stale fuel.
4. Vent in gas cap plugged.
5. Water or dirt in fuel system.
6. Dirty air cleaner.
7. Carburetor out of adjustment.
1. Move throttle lever to FAST
position.
2. Connect and tighten spark plug wire.
3. Clean fuel line; fill tank with clean,
fresh gasoline.
4. Clear vent.
5. Drain fuel tank. Refill with fresh fuel.
6. Clean air cleaner.f
7. Adjust carburetor.t
Engine overheats 1. Engine oil level low.
2. Air flow restricted.
3. Carburetor not adjusted properly. 1. Fill crankcase with proper oil.
2. Remove blower housing and clean.t
3. Adjust carburetor.t
Occasional skip
(hesitates) at high speed 1. Carburetor idle speed too slow.
2. Spark plug gap too close.
3. Carburetor idle mixture adjustment
improperly set.
1. Adjust carburetor.t
2. Adjust gap to .030".
3. Adjust carburetor.t
Idles poorly 1. Spark plug fouled, faulty or gap too
wide.
2. Carburetor improperly adjusted.
3. Dirty air cleaner.
1. Reset gap to .030" or replace
spark plug.
2. Adjust carburetor.t
3. Clean air cleaner.f
Mower will not drive 1. Drive clutch cable out of adjustment.
2. Chain out of adjustment or stretched.
1. Adjust drive clutch cable (see
adjustment section).
2. Adjust or replace chain.
Excessive vibration 1. Cutting blade loose or unbalanced.
2. Bent cutting blade.
1. Tighten blade and adapter.
Balance blade.
2. Replace blade.
Mower will not
discharge grass
1. Engine speed too low.
2. Wet grass.
3. Excessively high grass.
1. Set throttle between 3/4 and full
throttle.
2. Do not mow when grass is wet;
wait until later to cut.
3. Mow once at a high cutting height,
then mow again at desired height or
make a narrower cutting swath
(1/2 width).
Uneven cut 1. Wheels not positioned correctly.
2. Dull blade.
1. Place all four wheels in same
height position.
2. Sharpen or replace blade.
tRefer to separate engine
Note: For repairs beyond
manual packed with your unit.
the minor adjustments listed above, contact your locai authorized service dealer.
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