Dolmar PS-421 Manuale Utente

4

System 

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 

STOP switch in      position,  fault or short-circuit in

 

 

 

the wiring, Spark plug cap or spark plug defective

 

Fuel supply 

Fuel tank is filled 

Combination switch in Choke position,   

 

 

 

 

carburetor defective, suction head dirty, fuel  

 

 

 

 

line bent or interrupted.

 

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 start difficulties 

Carburetor 

Fuel tank is filled 

Wrong carburetor adjustment.  

 

 

 

 

Ignition spark

Engine starts, but 

Fuel supply 

Fuel tank is filled 

Wrong idling adjustment, suction head or 

 

dies immediately 

 

 

carburetor dirty. 

 

 

 

Tank venting defective, fuel line interrupted,  

 

 

 

 

cable defective, Combination switch defective   

 

 

 

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.

No chain lubrication 

Oil tank/pump 

No oil on the chain 

Oil tank empty. 

 

 

 

 

 

 

 

Oil guide groove dirty. 

 

 

 

 

 

 

Oil-pump adjusting screw incorrectly adjusted.