Dolmar PS-350 - Manual (Page 4)

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Reparaturanleitung PS-4600 / PS-5000 4 Repair manual PS-350 / PS-420
Malfunction System Observation Cause
Chain does not run Chain brake Engine runs Chain brake actuated, Chain too tight
Engine does not start
or
only with difficulty
Ignition system Ignition spark
No ignition spark
Malfunction in fuel supply system, pressure system,
mechanical malfunction.
STOP switch stuck in service position, fault or short-
circuit in the wiring,
plug cap or spark plug defective,
gap between ignition module and flywheel uneven or too
wide
Fuel supply
Compression
Mechanical malfunction
Fuel tank is filled
Inside system
Outside
Starter does not engage
Combination switch in Choke position,
carburetor defective, suction head dirty,
fuel line bent, leaky or interrupted.
Cylinder base packing ring defective, radial shaft
packings defective,
cylinder or piston rings defective
Spark plug does not seal.
Spring in starter broken, broken parts inside the engine.
Engine speed gets
“stuck” Multiple systems Engine speed about
4,500 - 6,000 rpm
Carburetor too lean
Bleed air at cylinder and/or rubber induction piece
Fuel line bent, throttle link stuck
Warm engine won’t
start Carburetor Fuel tank is filled
Ignition spark
Wrong carburetor adjustment
Flooded from choke use
Piston ring worn (max. thrust play 0.5 mm)
Engine starts, but
dies immediately
Fuel supply Fuel tank is filled Wrong idling adjustment, suction head or carburetor dirty,
tank venting defective, fuel line interrupted, cable
defective, Choke flap closed, decompression valve dirty
Insufficient power Several systems
may be involved
simultaneously
Engine is idling Air filter dirty, incorrect carburetor setting, muffler
clogged, exhaust channel in cylinder clogged, spark
arrester screen clogged.
No chain lubrication Oil tank/pump No oil on the chain Oil tank empty
Oil guide groove dirty, Oil suction head dirty
Oil pump adjusting screw incorrectly adjusted
Oil pump worm drive gear defective
TROUBLESHOOTING