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Troubleshooting Husqvarna 592 Chainsaw

Troubleshoot Husqvarna 592 Chainsaw

Troubleshooting Husqvarna 592
The various faults that can affect a Husqvarna 592 chainsaw are divided into four groups. In each group the likely symptoms are given on the left and possible causes are listed on the right. The most likely faults are given first, and so on.

Chainsaws are pretty basic engines, requiring three basic areas, along with their basic associated components in order to start and run smoothly as well as to deliver the power, efficiency and reliability that is required:

Fuel – Carburettor, Fuel filter, Fuel mix, Hoses, Primer bulb, Breather

Spark – Spark Plug, Ignition unit, HT & short Lead, Stop Switch, Flywheel

Air – Air filter, Carburettor, Manifold, Muffler, Hoses, Breather

10 Basic Checks For The Husqvarna 592 Chainsaw

  • Pull the starter rope to see if the engine turns over and if compression is adequate.
  • Check fuel for quality and correct mix – recommend replacing with a known mix.
  • Check the fuel filter for blockage.
  • Check fuel supply pickup and hose for blockage or cracking from age.
  • Check the air filter for blockage.
  • Check the carburettor settings are correct (including the idle adjustment).
  • Check for spark.
  • Check spark plug electrode for wear or carbon build up and correct gap.
  • Check the muffler spark arrestor screen, if fitted visually check hoses, manifold and cylinder base gasket for leaks.
  • Remove the exhaust to check for piston seizure or ring damage if compression seems inadequate.

Husqvarna 592 Starting Problem

StartingPossible Causes
Difficulty startingAdjust L screw
Air filter blocked
Choke not working
Worn choke pivot
Worn choke valve
Fuel filter blocked
Fuel line blocked
Piston ring seized
Blocked impulse channel
Carburettor leaking
fuel
Loose or faulty fuel pipe
Hole in diaphragm
Worn needle valve
Needle valve assembly sticking
Needle valve set too high
Leak in metering system (air or fuel)
Loose cover on carburettor
pump side
Flooding when engine not runningWorn needle valve
Needle valve set too high
Needle valve assembly sticking

Husqvarna 592 Low Idling Problems

Idling (low rpm)Possible Causes
Will not idleAdjust L screw
Leaking air intake hose (rubber)
Loose carburettor mounting bolts
Loose or faulty fuel hose
Fuel filter blocked
Fuel line blocked
Fuel tank vent blocked
Throttle valve pivot stiff
Throttle pushrod sticking
Defective throttle return spring
Bent throttle stop
Faulty diffuser jet
Idling too richAdjust L screw
Worn needle valve
Needle valve set too high
Worn needle valve lever
Leaking control diaphragm/cover plate
Needle valve assembly sticking
Idles when L screw closedWorn needle valve
Leaking control diaphragm/cover plate
Needle valve assembly sticking
Worn needle valve lever
Faulty diffuser jet
Idling unevenFuel filter blocked
Fuel line blocked
Leaking air intake hose (rubber)
Loose carburettor mounting bolts
Worn throttle valve pivot
Loose throttle valve screw
Worn throttle valve
Needle valve assembly sticking
Leak in metering system (air or fuel)
Metering system centre knob is worn
Hole in diaphragm
Leaking control diaphragm/cover plate
Crankcase leaking
L screw requires constant adjustmentFuel line blocked
Needle valve set too high
Needle valve assembly sticking
Leak in metering system (air or fuel)
Leaking control diaphragm/cover plate
Faulty diffuser jets
Crankcase leaking
Too much fuel at idlingNeedle valve set too high
Needle valve assembly sticking
Metering system damaged
Worn needle valve
Leaking control diaphragm/cover plate
Metering system incorrectly assembled

Husqvarna 592 High Rev

High rpmPossible Causes
Will not run at full throttleAdjust H screw
Blocked air filter
Blocked fuel tank vent
Blocked fuel filter
Fuel line blocked
Loose or damaged fuel hose
Impulse channel leaking
Impulse channel blocked
Loose cover on carburettor pump side
Faulty pump diaphragm
Leaking air intake hose (rubber)
Loose carburettor mounting bolts
Needle valve set too low
Metering system damaged
Metering system incorrectly
assembled
Leaking control diaphragm/cover plate
Needle valve assembly sticking
Blocked silencer
Low powerAdjust H screw
Blocked fuel tank vent
Blocked fuel filter
Impulse channel leaking
Impulse channel blocked
Loose cover on carburettor pump side
Faulty pump diaphragm
Blocked air filter
Needle valve assembly sticking
Leak in metering system (air or fuel)
Metering system incorrectly
assembled
Loose diaphragm rivet
Hole in diaphragm
Leaking control diaphragm/cover plate
Will not “fourstroke”Blocked fuel tank vent
Blocked fuel filter
Fuel line blocked
Loose or damaged fuel hose
Impulse channel leaking
Impulse channel blocked
Loose cover on carburettor pump side
Faulty pump diaphragm
Leaking air intake hose (rubber)
Loose carburettor mounting bolts
Needle valve set too low
Leak in metering system (air or fuel)
Metering unit incorrectly assembled
Loose diaphragm rivet
Hole in diaphragm
Leaking control diaphragm/cover plate

Husqvarna 592 Acceleration

Acceleration retardationPossible Causes
Does not accelerateAdjust L screw
Adjust H screw
Blocked air filter
Blocked fuel tank vent
Blocked fuel filter
Fuel line blocked
Loose or damaged fuel hose
Impulse channel blocked
Loose cover on carburettor pump side
Faulty pump diaphragm
Leaking air intake hose (rubber)
Loose carburettor mounting bolts
Needle valve set too low
Metering system incorrectly
assembled
Needle valve assembly sticking
Faulty diffuser jets
Blocked silencer
Engine stalls when throttle releasedAdjust L screw
Adjust H screw
Faulty pump diaphragm
Needle valve set too high
Needle valve assembly sticking
Faulty diffuser jets
Too rich accelerationAdjust L screw
Adjust H screw
Blocked air filter
Faulty pump diaphragm
Faulty diffuser jets

Troubleshooting methods

In addition to the faults described in the above tables, trouble shooting can be carried out on specific components or sub-systems of the chainsaw. The various procedures are described in the relevant chapters (see the full manual on this website), see the contents page, as follows:

  • Pressure testing the carburettor. See the chapter “Carburettor”.
  • Pressure testing the crankcase and cylinder. See the
    chapter “Crankshaft, Piston and Cylinder”.

Husqvarna 592 Chainsaw workshop Manual and parts list available

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