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MAINTENANCE

18 – English

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 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 spark arrestor 
mesh. If your machine has this type of muffler, you should 
clean the mesh at least once a week. This is best done 
with a wire brush.

On mufflers without a catalytic converter the mesh should 
be cleaned weekly, or replaced if necessary. On mufflers 
fitted with a catalytic converter the mesh should be 
checked, and if necessary cleaned, monthly. 

If the mesh 

is damaged it should be replaced.

 If the mesh 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 
mesh will cause the machine to overheat and result in 
damage to the cylinder and piston. See also instructions 
under the heading Maintenance.

CAUTION! 

 Never use a machine with a defective muffler.

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

Fins on the flywheel.

3

Cooling fins on the cylinder.

4

Cylinder cover (directs 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 machine overheating which causes 
damage to the piston and cylinder.

Spark plug

The spark plug condition is influenced by:

Incorrect carburettor 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 
poorly at idle speed: always check the spark plug first 

!

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!

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Summary of Contents for 325HS75 X-series

Page 1: ...En n n ng g g gl l l li i i is s s sh h h h 325HS75X series 325HS99X series Operator s manual Please read the operator s manual carefully and make sure you understand the instructions before using the machine ...

Page 2: ...ctive gloves Wear sturdy non slip boots or shoes Noise emission to the environment according to the European Community s Directive The machine s emission is specified in chapter Technical data and on label Other symbols decals on the machine refer to special certification requirements for certain markets The engine is switched off by moving the stop switch to the stop position CAUTION The stop swi...

Page 3: ...park plug 18 Air filter 19 Gear housing 19 Cleaning and lubrication 20 Maintenance schedule 21 TECHNICAL DATA Technical data 22 EC declaration of conformity 23 WARNING Long term exposure to noise can result in permanent hearing impairment So always use approved hearing protection WARNING Under no circumstances may the design of the machine be modified without the permission of the manufacturer Alw...

Page 4: ...dustry Husqvarna s aim is also to be in the front edge according to ergonomics usability security and environmental protection That is the reason why we have developed many different features to provide our products within these areas We are convinced that you will appreciate with great satisfaction the quality and performance of our product for a very long time to come The purchase of one of our ...

Page 5: ... 5 Hand guard 6 Front handle 7 Cylinder cover 8 Starter handle 9 Fuel cap 10 Fuel tank 11 Air purge 12 Choke control 13 Throttle lock 14 Throttle control 15 Stop switch 16 Air filter cover 17 Combination spanner 18 Allen key 19 Transport guard 20 Catcher accessory 21 Spark plug cap and spark plug ...

Page 6: ...k of electric shock WARNING The ignition system of this machine produces an electromagnetic field during operation This field may under some circumstances interfere with pacemakers To reduce the risk of serious or fatal injury we recommend persons with pacemakers to consult their physician and the pacemaker manufacturer before operating this machine WARNING Running an engine in a confined or badly...

Page 7: ...turn springs This arrangement means that the throttle control is automatically locked at the idle setting Make sure the throttle control is locked at the idle setting when the throttle lockout is released Press the throttle lockout and make sure it returns to its original position when you release it Check that the throttle control and throttle lockout move freely and that the return springs work ...

Page 8: ...cks or deformation Check that the vibration damping element is undamaged and securely attached Muffler The muffler is designed to keep noise levels to a minimum and to direct exhaust fumes away from the user A muffler fitted with a catalytic converter is also designed to reduce harmful exhaust gases In countries that have a warm and dry climate there is a significant risk of fire We therefore fit ...

Page 9: ...m measured at the screws The edges of the blades are too hard to be filed Dull blades should be sharpened using a grinder Replace the blades if they are bent or damaged Gear housing The gear housing gets hot when the machine has been in use To avoid burning yourself do not touch the gear housing Assembly of the catcher accessory Loosen the nuts on top of the bar Align the bolts in the holes on the...

Page 10: ...rrect mixture is obtained When mixing small amounts of fuel even small inaccuracies can drastically affect the ratio of the mixture Petrol CAUTION Always use a quality petrol oil mixture at least 90 octane RON If your machine is equipped with a catalytic converter see chapter onTechnical data always use a good quality unleaded petrol oil mixture Leaded petrol will destroy the catalytic converter U...

Page 11: ... Contamination in the tank can cause operating problems Ensure that the fuel is well mixed by shaking the container before 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 ris...

Page 12: ...d and undamaged before you start the machine Starting and stopping Cold engine 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 WARNING The complete clutch cover and gear housing must be fitted before the machine is started otherwise the clutch may come loose and cause personal inj...

Page 13: ...ully pull the cord Push the choke control back to its original position as soon as the engine fires and continue trying to start until the engine starts 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 The engine is switched off by moving the stop switch to the stop position CAUTION The...

Page 14: ...o other people or their property Safety instructions while working Always ensure you have a safe and stable working position Always use both hands to hold the machine Hold the machine in front of your body Use your left hand to control the throttle setting Make sure that your hands and feet do not come near the cutting attachment when the engine is running When the engine is switched off keep your...

Page 15: ...s after completing work The transport guard should always be fitted to the cutting attachment when the machine is not in use Make sure the cutting attachment has stopped before cleaning carrying out repairs or an inspection Disconnect the HT lead from the spark plug Always wear heavy duty gloves when repairing the cutting attachment This is extremely sharp and can easily cause cuts Store the machi...

Page 16: ...sted during testing at the factory The basic setting is richer than the optimal setting and should be maintained for the first few hours the machine is in use The carburettor should then be finely adjusted Fine adjustment should be carried out by a skilled technician CAUTION If the blades move while the engine is idling the T screw should be turned anti clockwise until they stop Rec idle speed 270...

Page 17: ...o high and cause engine damage Do not let the engine run at full speed for more than 10 seconds Apply full throttle and turn the high speed jet H very slowly clockwise until the engine slows down Then turn the high speed jet H very slowly anticlockwise until the engine starts to run unevenly Now turn the high speed jet H slowly clockwise a little way until the engine runs smoothly Note that the en...

Page 18: ... and result in damage to the cylinder and piston See also instructions under the heading Maintenance CAUTION Never use a machine with a defective muffler 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 Fins on the flywheel 3 Cooling fins on the cylinder 4 Cylinder cover dire...

Page 19: ...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 o...

Page 20: ...lubrication Clean any resin and plant residue from the blades using cleaning agent 531 00 75 13 UL22 before and after using the machine Lubricate the blade bars with special grease part no 531 00 75 12 UL 21 before long periods of storage ...

Page 21: ... 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 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 mesh on the muffler only applies to muff...

Page 22: ...d regulated ignition system Yes Yes Ignition system Manufacturer type of ignition system Walbro MB Walbro MB Spark plug Champion RCJ 7Y NGK BPM7A Champion RCJ 7Y NGK BPM7A Electrode gap mm 0 5 0 5 Fuel and lubrication system Manufacturer type of carburettor Zama C1Q Zama C1Q Fuel tank capacity litre 0 5 0 5 Weight Weight without fuel kg 5 7 6 0 Noise emissions see note 1 Sound power level measured...

Page 23: ... 1998 relating to machinery 98 37 EC annex IIA of May 3 1989 relating to electromagnetic compatibility 89 336 EEC and applicable supplements of May 8 2000 relating to the noise emissions in the environment 2000 14 EC Conformity assessment according to Annex V For information relating to noise emissions see the chapter Technical data The following standards have been applied EN292 2 CISPR 12 1997 E...

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