Husqvarna 3120XP manual Starter, High speed jet H, Correctly adjusted carburettor, Maintenance

MAINTENANCE

High speed jet H

H

This chain saw is equipped with a carburettor that has a built- in fixed high speed jet.

CAUTION! There is an integrated speed governor in the ignition that limits the maximum speed to 12,000 rpm. Adjusting the jet therefore has no effect on the maximum speed. The high speed jet affects the chain saw’s power.

For optimum setting of the carburettor, contact a qualified servicing dealer who has a revolution counter at his disposal.

CAUTION! Setting the high speed jet too lean reduces the engine’s power and causes overheating. This results in engine damage.

Correctly adjusted carburettor

When the carburettor is correctly adjusted the machine accelerates without hesitation and the machine 4-cycles a little at max speed. It is also important that the chain does not rotate at idle. If the L-jet is set too lean it may cause starting difficulties and poor acceleration. If the H-jet is set too lean the machine will have less power, poor acceleration and could suffer damage to the engine. If the L and H-jets are set too rich it will lead to acceleration problems or too low a working speed.

Starter

WARNING! When the recoil spring is wound

!up in the starter housing it is under tension and can, if handled carelessly, pop out and cause personal injury. Always be careful when changing the recoil spring or the starter cord. Always wear protective goggles.

Changing a broken or worn starter cord

Length of starter cord: 1100 mm (43")

Thickness of starter cord: 4.0 mm (5/32")

•Loosen the screws that hold the starter against the crankcase and remove the starter.

•Pull out the cord approx. 30 cm and hook it into the notch in the rim of the pulley. Release the recoil spring by letting the pulley rotate slowly backwards.

•Undo the screw in the centre of the pulley and remove the pulley. Insert and fasten a new starter cord to the pulley. Wind approx. 3 turns of the starter cord onto the pulley.

Connect the pulley to the recoil spring so that the end of the spring engages in the pulley. Fit the screw in the centre of the pulley. Insert the starter cord through the hole in the starter housing and the starter handle. Make a secure knot in the end of the starter cord.

Tensioning the recoil spring

•Hook the starter cord in the notch in the pulley and turn the starter pulley about 2 turns clockwise.

CAUTION! Check that the pulley can be turned at least a further 1/2 turn when the starter cord is pulled all the way out.

Changing a broken recoil spring

•Lift up the starter pulley. See instructions under the heading Changing a broken or worn starter cord. Remember that the recoil spring is coiled under tension in the starter housing.

30 – English