Husqvarna 61, 268, 272XP manual Needle bearing maintenance Winter use, Cooling system

MAINTENANCE

Needle bearing maintenance

Winter use

The clutch drum is equipped 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 needle bearing at the drive shaft, whitch has to be greased regularly (once a week).

NOTE! Use only high quality bearing grease.

A

B

During winter time, powder snow and cold weather can cause running problems, such as:

•Too low engine temperature.

•Icing on the air filter and carburettor.

Therefore some special measures are required:

•Partly reduce the air inlet of the starter and by doing that increase the engine temperature.

•Preheat the intake air to the carburettor by removing the special plug between the cylinder and the carburettor space.

The cylinder cover has a special feature for use in cold climates. It is possible to open up a hole in the cylinder cover which can then be plugged with a rubber plug during warmer weather.

(Ref. no. 503 40 59-01)

Temperature 0oC (32oF) or colder

Break out the hole or remove the rubber plug so that preheated air from the cylinder can enter the carburettor chamber and

Cooling system

To obtain the lowest possible running temperature the saw is equipped with a cooling system.The cooling system consists of:

1.	Air intake on the starter	5
	unit.	4
2.	Air guide plate.	3
3.	Fan blades on the
	flywheel.
4.	Cooling fins on the
	cylinder.
5.	Cylinder cowling	2
		1
	(supplies cold air over
	the cylinder).

Clean the cooling system with a brush once a week, more often in demanding conditions. A dirty or blocked cooling system results in the saw overheating which causes damage to piston and cylinder.

Heated handles (272XPG)

On the model 272XPG both the front handle and the rear handle are equipped with electrical heating coils. These are supplied with electricity both from a built-in generator in the electrical system. The switch for the heating coils is placed below the stop switch. When the red marking is visible, the heating is on.

prevent the air filter from icing up.

Temperature -5oC (23oF) or colder

If the saw is used in severe cold or powder snow conditions you can fit a special cover over the starter unit. This reduces the flow of cold air and prevents large amounts of snow from being sucked in.

(Ref. no. 503 53 53-71)

IMPORTANT! If a special winter kit is assembled or measures are taken to increase the engine temperature, a readjustment to normal setting has to be done when the saw is used under normal conditions. Otherwise, there is a risk of overheating, which can cause severe engine damage.

IMPORTANT! Any maintenance other than that described in this manual must be carried out by your servicing dealer.

32 – English