Husqvarna 326HD75, 326HD60 manual Maintenance, Carburetor

MAINTENANCE

Carburetor

Your Husqvarna product has been designed and manufactured to specifications that reduce harmful emissions.

After your unit has been run 8-10 tanks of fuel the engine has broken in. To ensure that your unit is at peak performance and producing the least amount of harmful emissions after break in, have your authorized servicing dealer, who has a revolution counter at his disposal, to adjust your carburetor for optimum operating conditions.

!WARNING!

The blades must be fitted before the hedge trimmer is started, otherwise the clutch can become loose and cause personal injury.

Operation

• The carburetor governs the engine’s speed via the throttle. Air/fuel is mixed in the carburetor. The air/fuel mixture is adjustable. To take advantage of the engine’s optimal output the adjustment must be correct.

• The setting of the carburetor means that the engine is adapted to local conditions, for example, the climate, altitude, gasoline and the type of 2-stroke oil.

•The carburetor is equipped with three adjustment possibili- ties:

H = High speed needle L = Low speed needle

T = Idle speed adjuster screw

•The fuel quantity in relation to the air flow permitted by the throttle opening is adjusted using the L and H-needles. Turning the needles clockwise gives a leaner fuel mixture (less fuel) and turning them anti-clockwise gives a richer fuel mixture (more fuel). A leaner mixture gives high revs while a richer mixture give less revs.

•The T-screw regulates the position of the throttle while the engine is idling. Turning the screw clockwise gives a higher idling speed while turning it anti-clockwise gives a lower idling speed.

Basic setting

•The carburetor is set to its basic setting when test run at the factory. The basic setting is richer than the optimal setting and should be kept during the machine’s first working hours. Thereafter the carburetor should be finely adjusted. Fine adjustment should be carried out by a skilled technician.

NOTE! If the blades move while the engine is idling the T screw should be turned anti-clockwise until they stop.

Recommended idling speed is: 2 700 rpm.

Recommended max. speed: See “technical data”.

!WARNING!

If the idling speed cannot be adjusted so that the cutting attachment stops, contact your service workshop. Do not use the machine until it has been correctly adjusted or repaired.

Adjusting the idle speed, T

Adjust the idling speed with the screw T, if it is necessary to readjust. First turn the

idle speed adjusting screw TT clockwise until the cutting

attachment starts to rotate/ move.

Then turn, counter- clockwise until the cutting attachment stops. A correctly adjusted idle speed setting occurs when the engine runs smoothly in every position. The idle speed should also be well below the speed at which the blades start to move.

CAUTION! Contact your servicing dealer, if the idle speed setting cannot be adjusted so that the cutting attachment stops. Do not use the machine until it has been properly adjusted or repaired.

Correctly adjusted carburetor

A correctly adjusted carburetor means that the machine accelerates without hesitation and the machine 4-cycles a little at max speed. The blades should not move when the engine is idling or when the choke control is in the start position. A too lean adjusted low speed needle L may cause starting difficulties and bad acceleration.

A too lean adjusted high speed needle H gives lower power = less capacity, bad acceleration and/or damage to the engine. A too rich adjustment of the two speed needles L and H gives acceleration problems or too low working speed.

14 – English