4Repair Manual PS-6400/PS-7300/PS-7900
TROUBLESHOOTING
Malfunction System Observation Cause
Chain does not run Chain brake Engine runs Chain brake actuated.
Engine does not start or Ignition system Ignition spark Malfunction in fuel supply system, com-
only with difficulty pression system, mechanical malfunction.
No ignition spark Switch on STOP, fault or short-circuit in the
wiring, plug cap or spark plug defective.
Fuel supply Fuel tank is filled Choke in wrong position, carburetor defective,
fuel filter dirty, fuel line bent or interrupted, torn,
perforated
Compression Inside Cylinder base packing ring defective, radial
system shaft packings defective, cylinder or piston rings
defective
Outside Spark plug does not seal.
Mechanical Starter does not engage Spring in starter broken, broken parts
malfunction inside the engine.
Warm engine doesn‘t Carburetor Fuel tank is filled Wrong carburetor adjustment,
start Ignition spark flooded by usage of the ckoke
Engine starts, but Fuel supply Fuel tank is filled Wrong idling adjustment, fuel filter or
dies immediately carburetor dirty. Tank venting defective, fuel
line interrupted, cable defective, STOP switch
defective. Decompression valve dirty
Insufficient power Several systems Engine is idling Air filter dirty, wrong carburetor adjustment,
may be involved muffler clogged, exhaust channel in cylinder
simultaneously clogged, spark arrester screen clogged, worn piston
No chain lubrication Oil tank/pump No oil on the chain Oil tank empty, oil guide groove dirty,
oil-pump adjusting screw incorrectly adjusted,
oil pump drive defective
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