Husqvarna 122c Manual

							FUEL HANDLING
English – 11
Fuel safety
Never start the machine:
1 If you have spilled fuel on it. Wipe off the spillage and  allo
 w remaining fuel to evaporate.
2 If you have spilled fuel on yourself or your clothes,  change y
 our clothes. Wash any part of your body that 
has come in contact with fuel. Use soap and water.
3 If the machine is leaking fuel. Check regularly for  leaks from the fuel cap and fuel lines
 .
Transport and storage
•Store and transport the machine and fuel so that there 
is no risk of any leakage or fumes coming into contact 
with sparks or naked flames, for example, from 
electrical machinery, electric motors, electrical relays/
switches or boilers.
• When storing and transporting fuel always use  appro
 ved containers intended for this purpose.
• When storing the machine for long periods the fuel  tank m
 ust be emptied. Contact your local gas station 
to find out where to dispose of excess fuel.
• Ensure the machine is cleaned and that a complete  ser
 vice is carried out before long-term storage.
• The transport guard must always be fitted to the  cutting attachment when the machine is being 
tr

ansported or in storage.
• Secure the machine during transport.
• In order to prevent unintentional starting of the engine,  the spar
 k plug cap must always be removed during 
long-term storage, if the machine is not under close 
supervision and when performing all service 
measures.
Fuel
CAUTION!  The machine is equipped with a two-stroke 
engine and must always been run using a mixture of 
gasoline and two-stroke engine oil. It is important to 
accurately measure the amount of oil to be mixed to 
ensure that the correct mixture is obtained. When mixing 
small amounts of fuel, even small inaccuracies can 
drastically affect the ratio of the mixture.
Gasoline
CAUTION!  Always use a quality gasoline/oil mixture with 
an octane rating of at least 87 octane ((RON+MON)/2). If 
your machine is equipped with a catalytic converter (see 
chapter on Technical data) always use a good quality 
unleaded gasoline/oil mixture. Leaded gasoline will 
destroy the catalytic converter.
Use low-emission gasoline, also known as alkylate 
gasoline
 , if it is available. 
This engine is certified to operate on unleaded 
gasoline.
•The lowest recommended octane grade is 87 
((RON+MON)/2). If you run the engine on a lower 
octane grade than 87 so-called knocking can occur. 
This gives rise to a high engine temperature and 
increased bearing load, which can result in serious 
engine damage.
• When working at continuous high revs a higher octane  r
 ating is recommended.
Two-stroke oil
•For best results and performance use HUSQVARNA 
two-stroke engine oil, which is specially formulated for 
our air-cooled two stroke-engines.
• Never use two-stroke oil intended for water-cooled  engines
 , sometimes referred to as outboard oil (rated 
TCW).
• Never use oil intended for four-stroke engines.
• Mixing ratio 1:50 (2%) with HUSQVARNA two-stroke oil.
!
WARNING! Take care when handling fuel. 
Bear in mind the risk of fire, explosion 
and inhaling fumes.
!
WARNING! Fuel and fuel fumes are 
highly inflammable and can cause 
serious injury when inhaled or allowed to 
come in contact with the skin. For this 
reason observe caution when handling 
fuel and make sure there is adequate 
ventilation.
Gasoline, litre Two-stroke oil, litre
2% (1:50)
50,10
100,20
150,6/0,30
200,40
US gallonUS fl. oz.
12 1/2
2 1/26 1/2
512 7/8 
						

							FUEL HANDLING
12 – English
Mixing
•Always mix the gasoline and oil in a clean container 
intended for fuel.
• Always start by filling half the amount of the gasoline  to be used.
  Then add the entire amount of oil. Mix 
(shake) the fuel mixture. Add the remaining amount of 
gasoline.
• Mix (shake) the fuel mixture thoroughly before filling  the machine’
 s fuel tank.
• Do not mix more than one month’s supply of fuel at a  time
 .
• If the machine is not used for some time the fuel tank  should be emptied and cleaned.
Fueling
•If you have spilled fuel on it. Wipe off the spillage and 
allow remaining fuel to evaporate.
• Clean the area around the fuel cap. Contamination in  the tank can cause oper
 ating problems.
• Ensure that the fuel is well mixed by shaking the  container bef
 ore filling the tank.
!
WARNING! The catalytic converter 
muffler gets very hot during and after 
use. This also applies during idling. Be 
aware of the fire hazard, especially when 
working near flammable substances and/
or vapours.
!
WARNING! Taking the following 
precautions, will lessen the risk of fire:
Mix and pour fuel outdoors, where there 
are no sparks or flames.
Do not smoke or place hot objects near 
fuel.
Always shut off the engine before 
refuelling.
Always stop the engine and let it cool for 
a few minutes before refuelling.
When refuelling, open the fuel cap slowly 
so that any excess pressure is released 
gently.
Tighten the fuel cap carefully after 
refuelling.
Always move the machine away from the 
refuelling area and source before 
starting. 
						

							STARTING AND STOPPING
English – 13
Check before starting
•Check that the trimmer head and trimmer guard are 
not damaged or cracked. Replace the trimmer head or 
trimmer guard if they have been exposed to impact or 
are cracked.
• Never use the machine without a guard nor with a  def
 ective guard.
• All covers must be correctly fitted and undamaged  bef
 ore you start the machine.
Starting and stopping
Starting
Primer bulb: Press the air purge repeatedly until fuel 
begins to fill the bulb. The bulb need not be completely 
filled.
Choke: Set the choke control in the choke position. 
Hold the body of the machine on the ground using your 
left hand (CA
 UTION! Not with your foot!). Grip the starter 
handle, slowly pull out the cord with your right hand until 
you feel some resistance (the starter pawls grip), now 
quickly and powerfully pull the cord. 
Never wrap the 
starter cord around your hand
Repeat pulling the cord until the engine starts. When the 
engine starts. return choke control to run position and 
apply full throttle; the throttle will automatically disengage 
from the start setting.
CAUTION!  Do not pull the starter cord all the way out and 
do not let go of the starter handle when the cord is fully 
extended. This can damage the machine.
Stopping
Stop the engine by switching off the ignition.
CAUTION!  The stop switch automatically returns to the 
start position. In order to prevent unintentional starting, 
the spark plug cap must be removed from the spark plug 
when assembling, checking and/or performing 
maintenance. 
!
WARNING! The complete clutch cover and 
shaft must be fitted before the machine is 
started, otherwise the clutch can come 
loose and cause personal injury.
Always move the machine away from the 
refuelling area and source before starting. 
Place the machine on a flat surface. 
Ensure the cutting attachment cannot 
come into contact with any object. 
Make sure no unauthorised persons are in 
the working area, otherwise there is a risk 
of serious personal injury. The safety 
distance is 15 metres.
!
WARNING! When the engine is started 
with the choke in choke position the 
cutting attachment will start to rotate 
immediately. 
						

							WORKING TECHNIQUES
14 – English
General working instructions
Basic safety rules
1Look around you:
• To ensure that people, animals or other things cannot  aff
 ect your control of the machine.
• To ensure that people, animals, etc., do not come into  contact with the cutting attachment or loose objects 
that are thro

wn out by the cutting attachment.
• CAUTION! Do not use the machine unless you are  ab
 le to call for help in the event of an accident.
2 Inspect the working area. Remove all loose objects,  such as stones
 , broken glass, nails, steel wire, string, 
etc. that could be thrown out or become wrapped 
around the cutting attachment.
3 Do not use the machine in bad weather, such as  dense f
 og, heavy rain, strong wind, intense cold, etc. 
Working in bad weather is tiring and often brings 
added risks, such as icy ground, unpredictable felling 
direction, etc.
4 Make sure you can move and stand safely. Check the  area around y
 ou for possible obstacles (roots, rocks, 
branches, ditches, etc.) in case you have to move 
suddenly. Take great care when working on sloping 
ground.
5 Keep a good balance and a firm foothold. Do not  o
 verreach. Keep proper footing and balance at all 
times. 6 Always hold the machine with both hands. Hold the 
machine on the r
 ight side of your body. Keep all parts 
of your body away from the hot surfaces. Keep all 
parts of your body away from the rotating cutting 
attachment.
7 Keep the cutting attachment below waist level.
8 The engine must be switched off before moving.
9 Never put the machine down with the engine running  unless y
 ou have it in clear sight.
IMPORTANT!
This section takes up the basic safety precautions for 
w

orking with a trimmer.
If you encounter a situation where you are uncertain 
ho
 w to proceed you should ask an expert. Contact your 
dealer or your service workshop.
Avoid all usage which you consider to be beyond your 
capability
 .
You must understand the difference between forestry 
clearing, grass clearing and grass trimming before use.
!
WARNING! Neither the operator of the 
machine nor anyone else may attempt to 
remove the cut material while the engine 
is running or the cutting equipment is 
rotating, as this can result in serious 
injury.
Stop the engine and cutting equipment 
before you remove material that has 
wound around the blade shaft as 
otherwise there is a risk of injury. The 
bevel gear can get hot during use and 
may remain so for a while afterwards. You 
could get burnt if you touch it.
!
WARNING! Watch out for thrown objects. 
Always wear approved eye protection. 
Never lean over the cutting attachment 
guard. Stones, rubbish, etc. can be 
thrown up into the eyes causing 
blindness or serious injury.
Keep unauthorised persons at a 
distance. Children, animals, onlookers 
and helpers should be kept outside the 
safety zone of 15 m. Stop the machine 
immediately if anyone approaches. Never 
swing the machine around without first 
checking behind you to make sure no-
one is within the safety zone. 
						

							WORKING TECHNIQUES
English – 15
Basic working techniques
Always slow the engine to idle speed after each working 
operation. Long periods at full throttle without any load on 
the engine can lead to serious engine damage.
Grass trimming with a trimmer head
Trimming
•Hold the trimmer head just above the ground at an 
angle. It is the end of the cord that does the work. Let 
the cord work at its own pace. Never press the cord 
into the area to be cut.
• The cord can easily remove grass and weeds up  against w
 alls, fences, trees and borders, however it 
can also damage sensitive bark on trees and bushes, 
and damage fence posts.
• Reduce the risk of damaging plants by shortening the  cord to 10-12 cm and reducing the engine speed.
Clearing
•The clearing technique removes all unwanted 
vegetation. Keep the trimmer head just above the 
ground and tilt it. Let the end of the cord strike the 
ground around trees, posts, statues and the like.  CAUTION! This technique increases the wear on the 
cord.
• The cord wears quicker and must be fed forward more  often when w
 orking against stones, brick, concrete, 
metal fences, etc., than when coming into contact with 
trees and wooden fences.
• When trimming and clearing you should use less than  full throttle so that the cord lasts longer and to reduce 
the w

ear on the trimmer head.
Cutting
•The trimmer is ideal for cutting grass that is difficult to 
reach using a normal lawn mower. Keep the cord 
parallel to the ground when cutting. Avoid pressing the 
trimmer head against the ground as this can ruin the 
lawn and damage the tool.
• Do not allow the trimmer head to constantly come into  contact with the g
 round during normal cutting. 
Constant contact of this type can cause damage and 
wear to the trimmer head.
Sweeping
•The fan effect of the rotating cord can be used for 
quick and easy clearing up. Hold the cord parallel to 
and above the area to be swept and move the tool to 
and fro.
• When cutting and sweeping you should use full  throttle to obtain the best results.
!
WARNING! Sometimes branches or 
grass get caught between the guard and 
cutting attachment. Always stop the 
engine before cleaning.
!
WARNING! Overexposure to vibration 
can lead to circulatory damage or nerve 
damage in people who have impaired 
circulation. Contact your doctor if you 
experience symptoms of overexposure 
to vibration. Such symptoms include 
numbness, loss of feeling, tingling, 
pricking, pain, loss of strength, changes 
in skin colour or condition. These 
symptoms normally appear in the 
fingers, hands or wrists. The risk 
increases at low temperatures. 
						

							MAINTENANCE
16 – English
Carburetor
Adjustment of the idle speed
Use suitable personal protective equipment. During 
adjustment the cutting attachment could rotate.
Before any adjustments are made, make sure that the air 
filter is clean and the air filter co
 ver is fitted.
Adjust the idle speed using the idle adjustment screw T, if 
it is necessar
 y to readjust. First turn the idle adjustment 
screw T clockwise until the cutting attachment starts to 
rotate. Then turn the screw anticlockwise until the cutting 
attachment stops. The idle speed is correctly adjusted 
when the engine will run smoothly in every position. The 
idle speed should also be well below the speed at which 
the cutting attachment starts to rotate.
Rec. idle speed: See the Technical data section.
Muffler
CAUTION!  Some mufflers are fitted with a catalytic 
converter. See chapter on Technical data to see whether 
your machine is fitted with a catalytic converter.
The muffler is designed to reduce the noise level and to 
direct the e
 xhaust 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 spark arrestor 
screen.
  If your machine has this type of muffler, you 
should clean the screen at least once a week. This is best 
done with a wire brush. On mufflers without a catalytic 
converter the screen should be cleaned weekly, or 
replaced if necessary. On mufflers fitted with a catalytic 
converter the screen should be checked, and if necessary 
cleaned, monthly. 
If the screen is damaged it should be 
replaced. If the screen is frequently blocked, this can be 
a sign that the performance of the catalytic converter is 
impaired. Contact your dealer to inspect the muffler. A 
blocked screen will cause the machine to overheat and 
result in damage to the cylinder and piston.
CAUTION!  Never use a machine with a defective muffler.
!
WARNING! If the idle speed cannot be 
adjusted so that the cutting attachment 
stops, contact your dealer/service 
workshop. Do not use the machine until it 
has been correctly adjusted or repaired.
!
WARNING! Mufflers fitted with catalytic 
converters get very hot during use and 
remain so for some time after stopping. 
This also applies at idle speed. Contact 
can result in burns to the skin. 
Remember the risk of fire! 
						

							MAINTENANCE
English – 17
Cooling system
To keep the working temperature as low as possible the 
machine is equipped with a cooling system.
The cooling system consists of:
1 Air intake on the starter.
2 Cooling fins on 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 machine overheating which causes 
damage to the piston and cylinder.
Spark plug
The spark plug condition is influenced by:
• Incorrect carburetor adjustment.
• An incorrect fuel mixture (too much or incorrect type  of oil).
• A dirty air filter.
These factors cause deposits on the spark plug 
electrodes
 , which may result in operating problems and 
starting difficulties.
If the machine is low on power, difficult to start or runs 
poor
 ly at idle speed: always check the spark plug first 
before taking any further action. If the spark plug is dirty, 
clean it and check that the electrode gap is 0.020 inch (0.5  mm). The spark plug should be replaced after about a 
month in operation or earlier if necessary.
CAUTION!  Always use the recommended spark plug 
type! Use of the wrong spark plug can damage the piston/
cylinder. Check that the spark plug is fitted with a 
suppressor.
Air filter
The air filter must be regularly cleaned to remove dust 
and dirt in order to avoid:
• Carburettor malfunctions
• Starting problems
• Loss of engine power
• Unnecessary wear to engine parts
• Excessive fuel consumption.
Clean the filter every 25 hours, or more regularly if 
conditions are e
 xceptionally dusty.
12 
						

							MAINTENANCE
18 – English
Cleaning the air filter
Remove the air filter cover and take out the filter. Wash it 
clean in warm, soapy water. Ensure that the filter is dry 
before refitting it. 
An air filter that has been in use for a long time cannot be 
cleaned completely
 . The filter must therefore be replaced 
with a new one at regular intervals. 
A damaged air filter 
must always be replaced.
If the machine is used in dusty conditions the air filter 
should be soaked in oil. See instructions under the 
heading Oiling the air filter.
Oiling the air filter
Always use HUSQVARNA filter oil, art. no. 531 00 92-48. 
The filter oil contains a solvent to make it spread evenly 
through the filter. You should therefore avoid skin contact.
Put the filter in a plastic bag and pour the filter oil over it. 
Knead the plastic bag to distr
 ibute the oil. Squeeze the 
excess oil out of the filter inside the plastic bag and pour 
off the excess before fitting the filter to the machine. Never 
use common engine oil. This would drain through the filter 
quite quickly and collect in the bottom. 
						

							English – 19
MAINTENANCE
Maintenance schedule
The following is a list of the maintenance that must be performed on the machine. Most of the items are described in the 
Maintenance section.
MaintenanceDaily 
maintenance Weekly 
maintenanceMonthly 
maintenance
Clean the outside of the machine.
X
Make sure the throttle trigger lock and the throttle function 
correctly from a saf
 ety point of view. X
Check that the stop switch works correctly. X
Check that the cutting attachment does not rotate at idle. X
Clean the air filter. Replace if necessary. X
Check that the guard is undamaged and not cracked. Replace 
the guard if it has been e
 xposed to impact or is cracked. X
Check that the trimmer head is undamaged and not cracked. 
Replace the tr
 immer head if necessary. X
Check that nuts and screws are tight. X
Check that there are no fuel leaks from the engine, tank or fuel 
lines
 . X
Check the starter and starter cord. X
Check that the vibration damping elements are not damaged. X
Clean the outside of the spark plug. Remove it and check the 
electrode gap
 . Adjust the gap to 0.5 mm (.020”), or replace the 
spark plug. Check that the spark plug is fitted with a suppressor. X
Clean the machine’s cooling system. X
Clean or replace the spark arrestor screen on the muffler (only 
applies to m
 ufflers without a catalytic converter). X
Clean the outside of the carburettor and the space around it. X
Check the fuel filter from contamination and the fuel hose from 
cr
 acks or other defects. Replace if necessary. X
Check all cables and connections. X
Replace the spark plug. Check that the spark plug is fitted with a 
suppressor
 .X 
						

							20 – English
TECHNICAL DATA
Technical data
NOTE! This spark ignition system complies with the Canadian standard ICES-002.
Note 1: Reported data for equivalent sound pressure level for the machine has a typical statistical dispersion (standard 
deviation) of 1 dB (A).
Note 2: Reported data for equivalent vibration level has a typical statistical dispersion (standard deviation) of 1 m/s
2.
122C
Motor
Cylinder displacement, cu.in/cm31,32/21,7
Cylinder bore, inch/mm 1,26/32
Stroke, inch/mm 1,06/27
Idle speed, rpm 2900
Recommended max. speed, rpm 7200
Speed of output shaft, rpm 7200
Max. engine output, acc. to ISO 8893, kW/ rpm 0,6/7800
Catalytic converter muffler Ye s
Speed-regulated ignition system No
Emissions Durability Period according to California Air Resources Board, h. 50
Ignition system
Spark plugNGK CMR6A
Electrode gap, inch/mm 0,02/0,5
Fuel and lubrication system
Fuel tank capacity, US pint/litre0,6/0,3
Weight
Weight without fuel, cutting attachment and guard, Lbs/kg 9,5/4,3
Sound levels
(see note 1)
Equivalent sound pressure level at the operator’s ear, measured according to EN ISO 11806 
and ISO 22868, dB(A):
Equipped with trimmer head (original), left/right 88
Vibration levels
(see note 2)
Equivalent vibration levels (ahv,eq) at handles, measured according to EN ISO 11806 and ISO 
22867, m/s2
Equipped with trimmer head (original), left/right 5,0/3,6
Powerhead modelAccessories TypeCutting attachment 
guar
d, Art. no.
122C
Blade shaft thread 3/8 R
Trimmer head T25 (Ø 2.0 - 2.7 mm cord)
574 47 95-01
T25C (Ø 2.0 - 2.7 mm cord)574 47 95-01