Husqvarna 444 User manual

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~nsa.
motle. .
Fuel tank capacity 0.5 1
Oil tank capacity 0.25 1
Sawing chain 0.325 pitch
Guide bar 32 cm
Weight, empty incl.
32 cm guide bar, chain SE 6.0 kg
and chain brake SG 6.1 kg
TECHNICAL SPECIFICATION
Displacement :.. 44 cm
3
Bore 42 mm
Stroke , 32 mm
Ignition advance 2'r-2Bo before t.d.c.
at 9.000 rpm
Sparking plug Bosch WS 7F/WS AF
Champion CJ 7Y
Electrode gap 0.5 mm
Carburettor Diaphragm type
Walbro HDC 51
Operator s manual

WHAT IS WHAT ON THE CHAIN SAW?
\,---------- 7
______-----8
:-;,-------9
2
.-----------10
,-----11
c------12
c----13
3
Fig.1
1. Starter handle
2. Oil filler cap
3. Starter
4. Fuel filler cap
5. Stop switch
6. Throttle controi
7. Safety handle for chain brake
8. Automatic chain brake
9. Cylinder cover
10. Choke controi
11. Starting throttle ratchet
12. Heating switch
13. Safety catch
4
5 6
I
ASSEMBLlNG GUIDE BAR AND CHAIN
A. Undo the guide bar nut and remove the clutch cover and trans-
port packing piece.
B. Place the guide bar into its rearmost position. Make sure that the
chain tensioning stud is properly into the hole in the guide bar.
~'
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I
Fig.2
C. Fit the chain around the drive sprocket and in the groove of the
bar. Start on the upper side of the guide bar.
Make sure that the cutting edges of the sawing teet h along the
top of the guide bar are facing towards the nose. Also check that
the drive links go down properly into the drive sprocket.
ALWAYS TOP UP WITH FUEL AND CHAIN LUBRICANT AT
THE SAME TIME
Fig.3
D. Tension the chain so it does not sag along the bottom of the
guide bar. Check that the chain and guide bar fit properly.
Fit the clutch cover and tighten the nut fingertight only.
Pull the chain a few turns around by hand and see to, that it can
move freely.
E. Tension the chain while holding up the bar nose. Do not tension
the chain stronger than it can be pulled around by hand.
Tighten the guide bar nut.
NOTE
Do not forget to "run in" the chain and guide bar. Please see the
chain manufacturer's recommendation.
CHECK THE CHAIN TENSION FREQUENTL y FOR
OPTIMAL PERFORMANCEAND DURABILITY
FUEl AND Oll
The power plant of this chain saw is a
twost.oke engine, that is run on a pet-
rol- and oil mixture of certain propor-
tions acc. to the table.
Do not use but a twostroke oil of high
quaiity, e.g. Husqvarna Twostroke Oil,
that is specially developed for chain
saws.
NOTE'
No extra oil is needed in'the petroi du-
ring the running-in period of the chain
saw.
For lubricating the chain and guide bar
we recommend a chain lubricating oil
with good adhesive properties.
During the wintertime at air temperatu-
res below O°C(32°F) some types of
chain lubricating oils are viscous. This
can cause overioading of the oil pump,
which can result in damage of the
pump drive and pump parts. Under cold
weather conditions it is therefore ne-
cessary to use a "wintergrade" oil
which stavs fluent even when cold.
Concerning the Choice of oil and its
suitability at different air temperatures,
please refer to your Husqvarna dealer.
Fig.4
NOTE
On no account waste oil should be used as this can damage the oil
pump.
Mixing table 2%
4%
5%
Litres Pints Litres Petroi in Petroi in Litres Petroi in Petroi in Litres Petroi in Petroi in
of oil of oil of petroi Imp. gallon US gallon of petroi Imp. gallon US gallon of petroi trnp, gallon US gallon
0.2 0.35 10 2.2 2.6 51.1 1.3
4
0,8 1.0
0.4 0.70 20 4.4 5.2 10 2.2 2.6 8 1.7 2.1
1.0 1.76 50 11.0 13.2 25 5,5 6.6 20 4.4 5.2
As a rule the petroi mixture should be 1 part oil to 25 parts petroi
(1:25 or 4%) When using the special oil Husqvarna Twostroke Oil, this shall be
mixed 1 part oil to 50 parts petroi (1:50 or 2%).

ADJUSTING THE CHAIN BRAKE
Tension the brake lining of the chain brake by screwing in the nut
clockwise (see fig. 5) until the chain cannot be pulled round by hand in
its proper direction. Then loosen the nut approx. 4 tums. Now it shall
be possible to pull the chain round easily without the brake lining
being in close contact with the clutch drum.
The automatic chain brake actuator (Swed-o-Matic) shall be ad-
justed so that the distance between the hand le and the set screw on
the chain brake is approx. 5 mm (see lig. 6). Alarger distance re-
quires a greater force to make the Swed-o-Matic actuate.
Fig.5
Check the chain brake function regularly.
A. Start the chain saw and release the brake (safety handle in lorward
position)
B. Open the throttle quickly. Now the chain is not supposed to rotate.
At correct adjustment the Swed-o-Matic is supposed to actuate at a
load of 10-12 kp (2.2Ib) on the guide bar nose.
Check the adjustment as follows:
Keep the saw horizontally 35 cm (14") above a stump. The brake is
supposed to release when the saw is pending, by its own weight,
around the rear handle and hits the stump.
MAINTENANCE OF THE CHAIN
BRAKE
Use the chain brake as aparking brake when moving the chain saw
and when making short breaks.
At breaks:
Check that the chain brake mechanism runs easily without seizing.
If it seizes:
Remove resin and sawdust from the chain brake. See to, that bear-
ings and sliding surfaces (see fig. 6) are lubricated with chain oil
or temperature-resistant engine oil.
Check that the braking capacity is sufficient. If not, adjust the chain
brake by means of the adjusting knob. (N.B. See to, that the brake
lining does not lie close to the drum in unbraked position).
At the service workshop:
Check that the braking mechanism and the braking lining are free
from sawdust and dirt.
Check the wear of the braking lining and see to, that it does not lie
elose to the drum in unbraked position.
Check the wear of the release.
Check that the safety handle is not deformed and that it has the
correct distance to the handle.
Lubricate with chain oil or temperature-resistant engine oil the bear-
ings and sliding surfaces of the safety hand le.
Check that the autornatic release "Swed-o-Matic" is adjusted prop-
erly (see fig. and above instructions).
ADJUSTING THE CARBURETTOR
The carburettor has three adjusting screws:
L = Low speed needle
H = High speed needle
T = ThroHle adjusting screw
The carburettor is adjusted as follows:
1. Clean the air filter.
2. Screw the needles H and L carefully right in.
3. Then screw the needles out to recommended basic position:
H = 1 turn out, L = 1 turn out
Fig.7
4. Start the engine and warm it up. Adjust the idling speed by means
01 the throttle adjusting screw to that R.P.M., at which the chain
starts rotating.
5. Adjust the low speed needle to reach the highest R.P.M., at which
the engine is still idling. Then screw the needle out equivalent to
10 minutes on.a clock-face.
Fig.8
6. Again adjust the idling speed by means of the throttle screw (see 4
above) so that a speed of approx 2,500 r/min is received.
7. At correct adjustment of the high speed needle, the engine is
supposed to be fourstroking.
If this is not the case, screw out the needle to reach a distinct
fourstroke.
Engine speed: Maximum 12,500 r/min.
NOTE
SHOULD THE ENGINE NOT BE FOURSTROKING,
THERE IS A RISK OF PISTON SEIZURE.
THE HIGH SPEED NEEDLE SHALL BE ADJUSTED FOR
MAXIMUM POWER AND NOT FOI=l MA)(IMII~A 0<="'"

CLEANING THE AIR FILTER
A clean air filter is necessary for optimal carburettor function and
optimal engine power.
Fig.9
In order to get at the air filter, remove the cylinder cover by undoing
the retaining screw and lifting the cover off upwards-backwards.
Remove the heaviest dirt from the air filter. Undo the screw and lift
the filter off carefully to avoid dirt from falling down into the
carbureltor.
i .
l
I
l
I
1
Fig.l0
Separate the two filter halves by means of a screwdriver or a knife.
Clean the filter halves carefully in warm soapy water.
Avoid cleaning them in chain saw petroL
You preferably dry the filter by blowing it with compressed air.
Reassemble the fifter and make sure, that it lies close to the
carburettor.
Usetwo airfilters alternately.
Clean the filter each day
CHANGING STARTER CORD AND
RETURN SPRING
Fig.11
Loosen the four screws that retain the starting device.
Remove the starting device.
Fig.12
Pull out the cord approx. 30 cm and lift it up into the notch in the
periphery of the pulley.
Zero-set the return spring by carefully permitting the pulley to rotate
backwards.
Undo the screw in the centre of the pulley and remove the latter.

Fig.13
In case you change the return spring as weil, undo the screws, that
retains the plastic cassette, which then can be removed.
Change the spring and lubricate it with engine oil.
Assemble the remaining parts in reverse order of removal.
lift up the starter cord into the notch on the pulley. Tension the
return spring by turning the pulley clockwise about two tums.
NOTE
Makesure, that il ispossible to tum the pulley at JeasthaJt
a tum further when the cord is fully pulled out.
\
STARTING THE CHAIN SA W
A. Cold engine
Fig.14
1. Switch on the ignition (push the stop switch to the right so that
the 1 is visible).
2. Pull out the choke controI.
Fig.15
3. Push down the throttle safety catch (A).
4. Open the throttle fully (B).
5. Push the starting throttle ratehet backwards (C).
Now all controis are in starting position and the chain saw is
ready to be starred.
6. Put your right foot on the plate beneath the rear handle.
7. Grasp the front handle with your left hand and press the saw
against the ground.
8. Grasp the starter handle with your right hand and pull out the
starting cord slowly until the starter pawls engage.
9. Give the starting cord a short sharp tug.
NOTE
Do not pull the starting cord entirely out or release the starting
handle in pulled out position, as this can cause damages on the
chain saw.
10. Normally the engine will start after 2-3 starting atternpts.
Push the choke controi as soon the engine starts.
Open rapidly the throttle wide and the catch will disengage.
B. Warm engine
Usethe same starting procedure as for cord engine but without
pulling out the choke controI.
Fig.16
NOTE
One of the most common eauses of starting difficulties is, that too
many starting attempts have been made with a closed choke flap. If
this is the case, remove the sparking plug and wipe it dry.
Open the choke flap fully.
Before your reassemble the sparking plug, we recommend you to
pull the starting handle several times to "ventilate the cylinder", the
stop switch in O-position.
Assemble the sparking plug and make a new starting attempt with
open choke flap and full throttle.
CAUTION
GUIDE BAR, CHAIN AND CLUTCH COVER MUST BE
MOUNTED BEFORE THE ENGINE IS STARTED, OTHER-
WISE THE CLUTCH MAY COME LOOSE AND CAUSE IN-

HEATED HANDLES
On model SG and FG both the front handle and the rear handle are
provided with electric heating elements. These are fed with electric
current from a generator, enclosed in the electric system.
Fig20
----------
r JO
The switch for the heating elements is located to the right of the rear
handle.
When the switch is pushed to the left (the O is visible), the heatinq is
switched off.
When the switch is pushed to the right (the l' is visible), the heating is
switched on. '
WINTERUSE
In wlnter, extreme cold and powdery snow can cause running pro-
blems.
'\
-A
NOTE ' ~'
Under normal temperatureponditions the caps has to be
mounted and the.covering"plate shalf be removed, otnerwise
there is a certain risk of over-heating of the chainsaw.
Fig.21
The cylinder cover is prepared to be changed for extreme cold
working conditions. In the partitioning wall of the cover there are two
holes, that are covered by caps when operating at normal tempera-
tures. In case of extreme cold, these caps sh all be removed, so that
heated air Irern the cylinder can tlow inta the carburettor space in
order to prevent e.g. the air filter from being iced up. ..
In order to prevent cold intake air from entering the earburetter
space, the covering plate (A) shall be mounted in the recess of the
cylinder cover (see fig. 21). At normal temperatures the covering plate
is to be kept in the pocket on the right side of the cover.
"
Safety reminders
Handling
1. When transporting the saw, fit the chain protection.
2. Do not smoke when filling the fuel tank.
3. Before cutting, fix the barkinqsupportproperly.
4. When using the saw, keep both hands on the hand les.
5. Nobody is allowed to be within the swing area of the saw.
6. Always stop the engine before checking and adjusting the chain tension for exchanging the chain.
Procedure
1. When felling, always step aside from the falling tree.
2. When escaping. stayalert for falling branches ..
3. When cutting split wood, look out for ejecting wood pieces.
4. When bucking afelled tree on sloping ground, always stand above the tree.
5. Be calm and collected when working; eliminate the risk of injury to other persons.
Personal safety equipment
1. To protect the hearing organ, the operator must wear protective wad, plugs or ear caps.
3. When cutting, wear gloves of chrorne leather.
3. When felling, wear a protective helmet.
4. Wear suitable cloths which do not hinder your work.