Troubleshooting - Makita Dolmar DCS460 Repair Manual

TROUBLESHOOTING

Malfunction System
Chain does not run Chain brake
Engine does not start or Ignition system
only with difficulty
Fuel supply
Compression
Mechanical malfunction
Engine speed gets "stuck" Multiple systems
Warm engine won't start Carburetor
Engine starts, but Fuel supply
dies immediately
Insufficient power Several systems
may be involved
simultaneously
No chain lubrication Oil tank/pump
Observation Cause
Engine runs Chain brake actuated, Chain too tight
Ignition spark Malfunction in fuel supply system, pressure system,
mechanical malfunction.
No ignition spark Switch on STOP, fault or short-circuit in the wiring,
plug cap or spark plug defective,
gap between ignition module and flywheel uneven or too wide
Fuel tank is filled Combination switch in Choke position,
carburetor defective, suction head dirty,
fuel line bent, leaky or interrupted.
Inside system Cylinder base packing ring defective, radial shaft packings defective,
cylinder or piston rings defective
Outside Spark plug does not seal.
Starter does not engage Spring in starter broken, broken parts inside the engine.
Engine speed about Carburetor too lean
4500 - 6000 rpm Bleed air at cylinder and/or rubber induction piece
Fuel line bent. Bowden cable sticking
Fuel tank is filled Wrong carburetor adjustment
Ignition spark Flooded from choke use
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
Engine is idling Air filter dirty, wrong carburetor adjustment, muffler clogged,
exhaust channel in cylinder clogged, spark arrester screen clogged.
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
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