Bolens 139-402A - Manual (Page 14)

TROUBLE SHOOTING CHART
A
CAUTION:
ALWAYS DISCONNECT SPARK PLUG BEFORE ATTEMPTING ANY REMEDY.
TROUBLE LOOK FOR REMEDY
Engine fails to start. Safety System If the engine will not start be sure the clutch control is
disengaged; blade controls disengaged, the throttle control
is set and the key is turned on.
A. Disconnect the yellow wire from the engine. This comes
from the ignition switch.
B. If the engine fails to start the problem is with the
engine, not the safety system.
C. If the engine starts, the prablem is with the safety
system. Check the yellow wire for a ground.
D. Check the operation of the switch behind the recoil
starter handle.
E. If the engine stops when the clutch or blade is engaged,
the recoil handle is not pushed into the receptacle and
twisted a quarter turn.
Blocked fuel fine
or empty gas tank
Clean fuel line; check fuel supply. Also check fuel shut-off
valve.
Defective spark
plug
Spark plug lead wire discannected.
Faulty spark plug—spark should jump gap between control
electrode and side electrode. If spark does not jump,
replace spark plug.
NOTE: Use insulated pliers to hold the spark plug wire.
Throttle setting Throttle control lever not in the starting position.
Loose connections Spark plug wire loose.
Hard starting or loss of
power.
Dirty air cleaner Remove air cleaner and clean as outlined in Engine Manual.
Carburetor im­
properly adjusted
Review paragraph Carburetor Adjustment.
Excessive vibration. Bent or damaged
blade spindle
Stop engine immediately; tighten all bolts and make all
necessary repairs. If vibration continues, have the unit
serviced by a competent repairman.
Unit fails to discharge
grass. Discharge chute
clogged
Clean discharge chute and inside of deck.
Foreign o b j e c t
lodged in deck
Remove object from deck. See CAUTION following step 1 in
paragraph Operation.
Engine overheats. Obstructions in air
passages Remove any obstruction from air passages in shroud. Grass
and dirt in engine shroud. Clean cooling fins.
Oil level Fill crankcase to proper oil level.
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