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Needle bearing maintenance
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.
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
unit.
2. Air guide plate.
3. Fan blades on the
flywheel.
4. Cooling fins on the
cylinder.
5. Cylinder cowling
(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.
32
– English
MAINTENANCE
A
B
5
4
3
2
1
Winter use
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 0
o
C (32
Break out the hole or remove
the rubber plug so that
preheated air from the
cylinder can enter the
carburettor chamber and
prevent the air filter from icing
up.
o
Temperature -5
C (23
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.
o
F) or colder
o
F) or colder
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