Husqvarna Z 254 Manual

							English Ð 31
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.
Air filter
The air filter must be regularly cleaned from dust and dirt in
order to avoid:
¥ Carburettor malfunctions
¥ 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
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.
MAINTENANCE
254, 257
Spark plug
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.
262
0,5 mm
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.
B
A
!
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. 
						

							32 Ð English
MAINTENANCE
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.
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 is made so it can be changed for running in
cold weather. There is a possibility to make a hole in which,
during the warmer part of the year, should be sealed using a
plug.
Temperature 0oC (32oF) or colder
Model 254: Turn the cover
lid so that the preheated air
from the cylinder can pass
into the carburettor area
preventing for instance icing
on the air filter.
Model 257, 262: Move the
cover from position A to
position B so that preheated
air can pass from the
cylinder to the carburettor
space and prevent forma-
tion of ice in the air filter.
NOTE! When the cover is
placed in the air nozzle it is
important that the air nozzle
seals hermetically to the
cylinder cover.
Temperature -5oC (23oF) or colder
For running the saw in cold
weather or powder snow, a
special cover is available,
which is mounted on the
starter housing. This
reduces the air flow and
prevents large amounts of
snow from being sucked in.
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.
Model 257, 262: When the cover is mounted in position A, it
must be turned with the cut towards the air filter. To make a
proper centrifugal cleaning possible, the air nozzle must seal
hermetically to the crankcase and cylinder cover.
IMPORTANT! Any maintenance other than that described in
this manual must be carried out by your servicing dealer.
On the model XPG both the
front handle and the rear
handle are equipped with
electrical heating coils. These
are supplied with electricity
from a built-in generator in the
electrical system. The switch
for the heating coils is placed
to the right of the rear handle.
When the switch is pushed to
the right, the heat is switched
on. When it is pushed to the
left, the heat is switched off.
Heated handles
12 5
4
3
Centrifugal cleaning ÓAir InjectionÓ
Centrifugal cleaning means
the following:
All air to the carburettor is
carried through the starter.
Dirt and dust is centrifuged
away by the cooling fan.
IMPORTANT! In order to
keep the function of the
centrifugal cleaning, a
continous maintenance and
care must be made.
¥ Clean the air intake to the
starter, the fan wings of the
flywheel, the space around
the flywheel, inlet pipe and
carburettor space.
257, 262254 
						

							English Ð 33
Weekly maintenance
1. Check that the AV
elements are not soft or
torn.
2. Lubricate the clutch drum
bearing.
3. File off burrs, if any, on
the sides of the bar.
4. Clean the spark plug and
check the gap.
The correct gap is 0.5 mm
(.020 inch).
5. Check the starter and the
recoil spring. Clean the
fins on the flywheel.
6. Clean the cooling fins on
the cylinder.
7. Clean or change the
screen in the muffler.
8. Clean the carburettor
body and air box.
MAINTENANCE
Below you will find some general maintenance instructions.
If you have more questions, contact your servicing dealer.
0,5 mm4
3
8
5
1
2
6
7
5
6
7
3
4
1
2
Daily maintenance
1. Check the throttle trigger
for smooth operation. If
any binding occurs, or if
engine fails to return to
idle, the saw should be
taken to your dealer,
before it is used again.
Also, be sure that the
trigger cannot be pulled
until the throttle trigger
lockout is depressed.
2. Clean the chain brake
and check its function
according to the
instructions. Make sure
that the chain catcher is
undamaged. Otherwise
replace it immediately.
3. Clean or replace the air
filter as necessary. Check
for damage or holes.
4. The bar should be turned
daily for more even wear.
Check the lubrication hole
in the bar, to be sure it is
not clogged. Clean the
bar groove, if the bar has
a sprocket tip, this should
be lubricated.
5. Check the function of the
oiler to be sure the bar
and chain receive proper
lubrication.
6. Sharpen the chain and
check its tension and
condition. Check the drive
sprocket for wear.
Replace if necessary.
7. Check the starter and
starter cord for wear or
damage. Clean the air
intake slots on the starter
housing.
8. Check for any loose nuts
and screws and retighten
if necessary.
9. Test the stop switch to be
sure it shuts off the
engine.
1
5
6
8
7
9
2
4
3
Monthly maintenance
1. Check the brake band on
the chain brake for wear.
2. Check the clutch centre,
clutch drum and clutch
spring for wear.
3. Clean the outside of the
carburettor.
4. Check the fuel filter.
Change if necessary.
5. Flush the inside off the
fuel tank with gasoline.
6. Flush the inside of the oil
tank with gasoline.
7. Check all cables and
connections. 
						

							34 Ð English
254XP
3,3/54
1,77/45
1,34/34
2.700
13.800
2,9/9.300
Electrolux
ET
Champion
RCJ 7Y
.012/0,5
Walbro
HDA35B
1,2/0,6
6,5-13,5
0,6/0,3
Automatic
 11,9/5,4
257
3,4/57
1,81/46
1,34/34
2.700
13.800
2,7/9.000
Ducati
ET
Champion
RCJ 7Y
.012/0,5
Walbro
HDA120
1,2/0,6
6,5-13,5
0,6/0,3
Automatic
 12,3/5,6
254XP
100
108
3,0
4,9
257
99,5
109
3,5
5,8
Noise levels
Equivalent (see note 1) noise
pressure level at operatorÕs
ear, measured according to
relevant international
standards, dB(A).
Equivalent (see note) noise
power level, measured
according to relevant interna-
tional standards, dB(A).
Vibration levels
(See note 2)
Front handle m/s2
Rear handle  m/s2
Chain/bar
Standard bar length,
inches/cm
Recommended bar lengths,
inches/cm
Usable cutting length
inches/cm
Chain speed at max.
power, m/sec
Pitch, inches
Thickness of drive link, inch/
mm
Number of teeth on drive
sprocket
Engine
Cylinder volume, cu.in/cm3
Cylinder bore, inch/mm
Stroke, inch/mm
Idle speed, rpm
Recommended max.
speed, unloaded, rpm
Power, kW
Ignition system
Manufacture
Type of ignition system
Spark plug
Electrode gap, inch/mm
Fuel and lubrication
system
Manufacturer
Carburettor type
Fuel capacity, US pint/litre
Oil pump capacity at 8500 rpm,
ml/min
Oil capacity, US pint/litre
Type of oil pump
Weight
Without bar and chain, Lbs/kg15/38
13/33Ð20/51
11-19/
30-49
17,3
.325/ 3/8
.058/1,5
715/38
13/33Ð20/51
11-19/
30-49
17,3
.325/ 3/8
.058/1,5
7
Note 1: Equivalent noise level is, according to ISO 7182 and
ISO 9207, calculated as the time-weighted energy total for
noise levels under various working conditions with the following
time distribution: 1/3 idle, 1/3 full load, 1/3 full speed.
Note 2: Equivalent vibration level is, according to ISO 7505,
calculated as the time-weighted energy total for vibration levels
under various working conditions with the following time
distribution: 1/3 idle, 1/3 full load, 1/3 full speed.
TECHNICAL DATA
1
5
L
Type Inch Inch/mm  Inch/mm Degree¡ Degree¡  Degree¡ Inch/mm Inch/cm: dl
H25 .325 .058/1,5 3/16 /4,8 85¡ 30¡ 10¡ .025/0,65 13/33:56 15/38:64
H2118/46:72
H42 3/8 .058/1,5     7/32 /5,5 60¡ 25¡ 10¡ .025/0,65 18/46:68
20/50:72
Bar and chain combinations
The following combinations are CE approved.
Bar Chain
          Length, Pitch, Max.
          inches inches tip radius
13 .325 10T Husqvarna H25
15 .325 10T Husqvarna H25
16 .325 10T Husqvarna H25
18 .325 10T Husqvarna H25
13 .325 10T Husqvarna H21
15 .325 10T Husqvarna H21
16 .325 10T Husqvarna H21
18 .325 10T Husqvarna H21
16 3/8 11T Husqvarna H42
18 3/8 11T Husqvarna H42
20 3/8 11T Husqvarna H42
«*2t@¦6>¬ 
						

							English Ð 35
262XP
3,8/62
1,89/48
1,34/34
2.700
13.500
3,4/9.600
Ducati
ET
Champion
RCJ 7Y
.012/0,5
Walbro
HDA120
1,2/0,6
6,5-13,5
0,6/0,3
Automatic
 12,7/5,8
262XP
100
109
3,3
5,4
15/38
13/33Ð20/51
11-19/
30-49
18,5
.325/ 3/8
.058/1,5
7
TECHNICAL DATA
Engine
Cylinder volume, cu.in/cm3
Cylinder bore, inch/mm
Stroke, inch/mm
Idle speed, rpm
Recommended max.
speed, unloaded, rpm
Power, kW
Ignition system
Manufacture
Type of ignition system
Spark plug
Electrode gap, inch/mm
Fuel and lubrication
system
Manufacturer
Carburettor type
Fuel capacity, US pint/litre
Oil pump capacity at 8500 rpm,
ml/min
Oil capacity, US pint/litre
Type of oil pump
Weight
Without bar and chain, Lbs/kg
Noise levels
Equivalent (see note 1) noise
pressure level at operatorÕs
ear, measured according to
relevant international
standards, dB(A).
Equivalent (see note) noise
power level, measured
according to relevant interna-
tional standards, dB(A).
Vibration levels
(See note 2)
Front handle m/s2
Rear handle  m/s2
Chain/bar
Standard bar length,
inches/cm
Recommended bar lengths,
inches/cm
Usable cutting length
inches/cm
Chain speed at max.
power, m/sec
Pitch, inches
Thickness of drive link, inch/
mm
Number of teeth on drive
sprocket
Note 1: Equivalent noise level is, according to ISO 7182 and
ISO 9207, calculated as the time-weighted energy total for
noise levels under various working conditions with the following
time distribution: 1/3 idle, 1/3 full load, 1/3 full speed.
Note 2: Equivalent vibration level is, according to ISO 7505,
calculated as the time-weighted energy total for vibration levels
under various working conditions with the following time
distribution: 1/3 idle, 1/3 full load, 1/3 full speed.
Bar and chain combinations
The following combinations are CE approved.
Bar Chain
          Length, Pitch, Max.
          inches inches tip radius
13 .325 10T Husqvarna H25
15 .325 10T Husqvarna H25
16 .325 10T Husqvarna H25
18 .325 10T Husqvarna H25
13 .325 10T Husqvarna H21
15 .325 10T Husqvarna H21
16 .325 10T Husqvarna H21
18 .325 10T Husqvarna H21
16 3/8 11T Husqvarna H42
18 3/8 11T Husqvarna H42
20 3/8 11T Husqvarna H42
1
5
L
Type Inch Inch/mm  Inch/mm Degree¡ Degree¡  Degree¡ Inch/mm Inch/cm: dl
H25 .325 .058/1,5 3/16 /4,8 85¡ 30¡ 10¡ .025/0,65 13/33:56 15/38:64
H2118/46:72
H42 3/8 .058/1,5     7/32 /5,5 60¡ 25¡ 10¡ .025/0,65 18/46:68
20/50:72