Bolens TMO-37478A - Manual (Page 22)

Trouble Shooting Chart
Problem Cause Remedy
1 Engine fails to start A Check fuel tank for gas
B Fuel shut-off valve closed
C Spark plug lead wire discon­
nected
D Throttle control lever not in
the starting position
E Faulty spark plug
F Carburetor improperly ad­
justed, engine flooded
G Old stale gasoline
A Fill tank if empty.
B Open fuel shut-off valve.
C Connect lead wire.
D Move throttle lever to start
position.
E Clean, adjust gap or replace.
F Remove spark plug, dry the
plug, crank engine with plug
removed, and throttle in off po­
sition. Replace spark plug and
lead wire and resume starting
procedures.
G Drain and refill with fresh
gasoline.
2 Hard starting or
loss of power
A Spark plug wire loose
B Carburetor improperly
adjusted
C Dirty air cleaner
A Connect and tighten spark
plug wire.
B Adjust carburetor. See separate
engine manual.
C Clean air cleaner as described
in separate engine manual.
3 Operation erratic A Dirt in gas tank
B Dirty air cleaner
C Water in fuel supply
D Vent in gas cap plugged
E Carburetor improperly
adjusted
A Remove the dirt and fill tank
with fresh gas.
B Clean air cleaner as described
in separate engine manual.
C Drain contaminated fuel and
fill tank with fresh gas.
D Clear vent or replace gas cap.
E Adjust carburetor. See
separate engine manual.
4 Occasional skip
(hesitates) at high
A Carburetor idle speed too
slow
A Adjust carburetor. See
separate engine manual.
speed B Spark plug gap too close
C Carburetor idle mixture ad­
justment improperly set
B Adjust to .030".
C Adjust carburetor. See
separate engine manual.
5 Idles poorly A Spark plug fouled, faulty, or
gap too wide
B Carburetor improperly
adjusted
C Dirty air cleaner
A Reset gap to .030" or replace
spark plug.
B Adjust carburetor. See
separate engine manual.
C Clean air cleaner as described
in separate engine manual.
6 Engine overheats A Carburetor not adjusted
properly
B Air flow restricted
C Engine oil level low
A Adjust carburetor. See
separate engine manual.
B Remove blower housing and
clean as described in separate
engine manual.
C Fill crankcase with the proper oil.
7 Excessive vibration A Cutting blade loose or
unbalanced
B Bent blade
A Tighten blade. Balance blade.
B Replace blade.
Note: For repairs beyond the minor adjustments listed above, contact your local service dealer.
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