Husqvarna 254XP, 257, 262XP manual Air filter, Spark plug, Muffler, Adjustment of the oil pump

MAINTENANCE

Air filter

The air filter must be regularly cleaned from dust and dirt in order to avoid:

•	Carburettor malfunctions	254, 257
•	Starting problems
•	Engine power reduction
•	Unnecessary wear on
	the engine parts
•	Abnormal fuel consumption

Clean the air filter daily or more often if the air is exceptionally dusty in the working area.

•Disassemble the air filter by removing the cylinder cover

and unscrew the filter.
When reassembling, make
sure that the filter is tight	262
against the filter holder.
Clean the filter by brushing
or shaking it.

• A more thorough cleaning of the filter is obtained by washing it in water and soap.

An air filter, which is used for some time, cannot be cleaned completely. Therefore it must be replaced by a new one, with regular intervals.

IMPORTANT! A damaged air filter must always be replaced.

Spark plug

0,5 mm

The spark plug condition is influenced by:

• An incorrect carburettor setting.

• Wrong fuel mixture (too much oil in the gasoline).

• A dirty air filter.

These factors cause deposits on the spark plug electrodes, which may result in malfunction and starting difficulties.

If the engine is low on power, difficult to start or runs poorly at idling speed, always check the spark plug first. If the spark plug is dirty,

clean it and check the electrode gap. Readjust if necessary. The correct gap is 0.5 mm (.020"). The spark plug should be replaced after about a month in operation or earlier if the electrodes are badly eroded.

IMPORTANT! Always use the recommended spark plug type. An incorrect spark plug can severely damage the piston/ cylinder.

Muffler

The muffler is designed in order to reduce the noise level and to direct the exhaust gases away from the operator. The exhaust gases are hot and can contain sparks, which may cause fire if directed against dry and combustible material. Some mufflers are equipped with a special screen. If your saw has this type of muffler, you should clean the screen at least once a week. This is done with a wire brush.

CAUTION! The screen must be replaced, if damaged. The saw will be overheated, if the screen is clogged. This results in damage on the cylinder and the piston. Never use a saw with a clogged or defective muffler.

Adjustment of the oil pump

The oil pump is adjustable. Adjustments are made by turning the screw using a screwdriver or combination spanner. The saw is supplied from the factory set to 1 turn open. Turning the screw clockwise will reduce the oil flow and turning the screw anti-clockwise will increase the oil flow.

!WARNING! The engine must not be running when making adjustments.

Recommended settings:

Bar 11"-15": 0-2 turns from the closed position.

Bar 15"-18": 2-3 turns from the closed position.

Needle bearing maintenance

The clutch drum is equipped	A
with one of the following chain
sprockets:

• Spur sprocket (A) (the chain sprocket is welded on the drum)

•Rim sprocket (B) (exchangeable)

Both versions have built-in	B
needle bearing at the drive
shaft, whitch has to be
greased regularly (once a
week).

NOTE! Use only high quality bearing grease.

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