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Husqvarna 326E X-series, Workshop Manual, Page: 56 / 72

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Husqvarna 326E X-series Workshop Manual Download Page 56

6

55

Cylinder and piston

Cause:

• 

Faulty air fi lter. Small dust particles 
pass through the fi lter.

• The 

fi lter is worn out due to too much 

cleaning, whereby small holes have 
appeared in the material.

• Unsuitable 

fi lter maintenance, such 

as wrong method or wrong cleaning 
agent. Flock material becomes loose 
and holes appear.

• Air 

fi lter incorrectly fi tted.

• Air 

fi lter damaged or missing.

Action:

Fit a fi ner grade fi lter.

Check the fi lter carefully for holes and 
damage after cleaning. Replace the fi lter if 
necessary.

Clean more carefully and use the right 
cleaning agent (such as tepid soapy wa-
ter). Change the fi lter.

Larger, softer particles that penetrate into the engine cause damage to the piston skirt 
under the piston ring as the illustration shows.

Cause:

• Air 

fi lter incorrectly fi tted.

• Air 

fi lter damaged or missing.

Action:

Fit the air fi lter correctly.

Fit a new air fi lter.

Inlet side.

Particles of dust and dirt from carbon-like deposits 
on the top of the piston and in the piston ring 
groove. The piston ring sits fi rmly in the groove. 
Piston material has been worn away.

The lower part of the piston skirt is thinner on the 
inlet side than on the exhaust side.

The piston scored and worn from the piston ring 
down on the inlet side.

Fit the fi lter correctly.

Fit a new air fi lter.

Summary of Contents for 326E X-series

Page 1: ...1 German Workshop manual English 326 E LS 327 ES LDX LS RJX RX ...

Page 2: ...__________21 4 Centrifugal clutch ___________________________37 5 Bevel gear cutting attachment _________________41 6 Cylinder and piston __________________________49 7 Crankshaft and crankcase _____________________59 8 Tools ______________________________________65 9 Technical data ______________________________69 Workshop Manual Brushcutter Trimmer Model 326 327 Husqvarna AB Sweden 2010 Contents...

Page 3: ...s Some of the work described in this workshop manual re quires special tools In each section where this is necessary there is a picture of the tool and an order number We recommend the use of special tools in order to avoid ex pensive damage to parts in question and personal injury and to provide an efficient repair procedure Contact faces and gaskets Ensure all surfaces are clean and free from ga...

Page 4: ...______________________________ 4 Dismantling model 327 LS ___________________________ 6 Assembly model 327 LS _____________________________ 6 Dismantling model 327 P5 ___________________________ 7 Assembly model 327 P5 _____________________________ 8 Replacing the drive dogs ____________________________ 10 ...

Page 5: ... lost Assembly Model H326 Clean the component parts and assemble in the reverse order as set out for dismantling Assembly Model H326 Clean component parts before assembling Replace the return spring starter pulley and starter cord if necessary NOTE The return spring and starter pulley are supplied pre assembled and are fitted in the starter housing as a single unit Exercise care when opening the p...

Page 6: ...f turn Fit the starter on the engine body Do not forget the guide sleeves for the fuel tank First press in the top edge of the starter under the cylinder cover Fit the starter on the engine body 1 Check that the rubber bushings are in position in the starter housing 2 Insert the top edge of the starter under the cylinder cover and fold the starter in against the engine body Press in the starter ag...

Page 7: ...ly Model H327 LS Clean the component parts and assemble in the reverse order as set out for dismantling Assembly Model H327 LS Clean component parts before assembling Replace the return spring starter pulley and starter cord if necessary NOTE The return spring and starter pulley are supplied pre assembled and are fitted in the starter housing as a single unit Exercise care when opening the packagi...

Page 8: ...into the notch on the starter pulley Now turn the starter pulley anticlockwise 6 turns Check the spring tension With the starter cord fully extended it should still be possible to turn the starter pulley further at least a half turn Fit the starter on the engine body and check that the drive dog engages Dismantling Model 327P5 Remove the handle bow from under the engine body Dismantling Model 327P...

Page 9: ...is released WARNING Wear protective glasses The return spring lies tensioned in the starter and can fly out and cause personal injury with careless handling Carefully lift off the starter pulley so that the tension in the return spring is not released Carefully lift off the starter pulley so that the tension in the return spring is not released Assembly Model H327 P5 Clean the component parts and ...

Page 10: ...sure equalisation spring the drive disc the screw and the washer The pressure equalisation spring must be placed in position so that the short spring end is inserted into the starter pulley Place the drive disc over the pressure equalisation spring Fit the screw and the washer A Tension the return spring Check the spring tension Fit the starter on the engine body Tension the return spring Pull the...

Page 11: ...54 15 01 in the spark plug hole and loosen the drive disc cup The nut is soldered onto the disc drive Remove the circlip and replace any damaged drive dogs or springs if necessary Remove the circlip holdings the drive dog Lift out the drive dog and spring for repla cement Assemble in the reverse order as set out for dismantling ...

Page 12: ...______________ 12 Dismantling model 326 ____________________________ 15 Assembly model 326 ______________________________ 16 Checking the ignition spark model 327 LS 327 P5 _______ 17 Dismantling model 327 LS 327 P5 ___________________ 19 Assembly model 327 LS 327 P5 ______________________ 20 ...

Page 13: ...eel brush Check the electrode gap It should be 0 5 mm Adjust the gap as needed to the correct value with the side electrode If the electrodes are worn more than 50 the spark plug should be changed If the electrodes are worn more than 50 the spark plug should be changed Too large a spark gap entails a great deal of stress on the ignition module and risk for short circuiting Check if a spark occurs ...

Page 14: ...plug now sparks the fault is either in the stop switch or the short circuit cable Change the switch as needed and check to see if the cable insulation is damaged Check that the connection between the ignition lead and the contact coil is not burnt If this is the case cut off the damaged section 3 Check the connection between the ignition lead and the contact coil Cut off a piece of the ignition le...

Page 15: ... that the cables are correctly drawn and lie in the cable grooves Do not forget to check the cables in the throttle too See chapter 3 Throttle TIP Use an Ohmmeter in order to easily check if cable breakage has occurred due to pinching for example Still no spark Check the air gap Still no spark Check the air gap between the flywheel magnet and the ignition module The gap should be 0 3 mm Use a 502 ...

Page 16: ...er and the fuel tank Remove the screws holding the clutch cover Remove the clutch cover complete with the shaft from the engine Remove the three screws holding the clutch cover on the engine Lift off the cover together with the shaft NOTE Do not lose the rubber bushings fitted between the fuel tank and the clutch cover Loosen the short circuit cable from the ignition module Loosen both ends of the...

Page 17: ...h a hammer if the flywheel sits tightly on the crankshaft Assembly Model 326 Check that the cast key in the flywheel and key way in the crankshaft are unda maged Fit the flywheel and centrifugal clutch Do not forget the washers A Note the slots on the washer lie closest to the flywheel Align with the equivalent pins on the flywheel Assemble the ignition module and adjust the air gap to 0 3 mm Asse...

Page 18: ...uit cable from the short circuit switch Prise up the switch by inserting a small screwdriver into the short end of the igni tion switch If the plug now sparks the fault is either in the stop switch or the short circuit cable Change the switch as needed and check to see if the cable insulation is damaged If no spark occurs disconnect the stop switch Replace the switch if necessary Still no spark Ch...

Page 19: ... cable brea kage and damaged insulation Make sure that the cables are correctly drawn and lie in the cable grooves Do not forget to check the cables in the throttle too See chapter 3 Throttle TIP Use an Ohmmeter in order to easily check if cable breakage has occurred due to pinching for example Still no spark Check the air gap Still no spark Check the air gap between the flywheel magnet and the ig...

Page 20: ...haft from the engine Remove the three screws holding the clutch cover on the engine Lift off the cover together with the shaft NOTE Do not lose the rubber bushings fitted between the fuel tank and the clutch cover Loosen the short circuit cable from the ignition module Loosen both ends of the short circuit cable from the ignition module Dismantle the ignition module and the centrifugal clutch Remo...

Page 21: ...with a hammer if the flywheel sits tightly on the crankshaft Assembly Model 327 LS 327 P5 Check that the cast key in the flywheel and key way in the crankshaft are unda maged Fit the flywheel and centrifugal clutch Do not forget the washers A Note the slots on the washer lie closest to the flywheel Align with the equivalent pins on the flywheel Assemble the ignition module and adjust the air gap t...

Page 22: ...____________________________________ 23 Fuel pump _______________________________________ 24 Carburettor ______________________________________ 24 Carburettor settings _______________________________ 31 Throttle model 326 ________________________________ 33 Throttle model 327 ________________________________ 34 Trouble shooting guide _____________________________ 36 ...

Page 23: ...and 327 P5 is made of foamed plastic and must be clea ned with lukewarm soapy water A damaged filter should be replaced with a new filter WARNING Do not clean not the filter with petrol Hazardous NOTE Do not blow the filter clean with compressed air It can be damaged Ensure that the filter is dry before refitting it TIP Use Husqvarna s cleaning agent Active Cleaning no 505 69 85 70 Impregnate the ...

Page 24: ...lter C Knock the housing against a tabletop so that the cover D over the diaphragm falls off Blow the filter C clean and the sintered filter E with compressed air and mount the fuel cap in the reverse order to how it was disassembled Make sure that the flat surface on the co ver D is turned towards the diaphragm Check that the tank venting is in working order by connecting the 531 03 06 23 test eq...

Page 25: ...rettor compartment and disconnect the throttle cable from the carburettor Remove the screws and fuel pipes and lift off the carburettor Carburettor Dismantling 1 Remove the carburettor cover and blow the carburettor compartment clean with compressed air 2 Disconnect the throttle cable from the lever arm on the carburettor and from the guide in the air filter connection 3 Remove carburettor screws ...

Page 26: ... the carburettor s function The blending unit Fuel and air are mixed here The blending unit In this section of the carburettor fuel and air are mixed in the proper proportions The choke and throttle valves are placed here In the middle of the venturi narrowest part of the throughput the main jet D is found The pump unit Pumps fuel from the tank to the carburettor The pump unit This is where the pu...

Page 27: ...r on the pin C Replace the diaphragm if required Pressure test the metering unit Connect pressure tester 531 03 06 23 to the fuel hose nipple Lower the carburettor in a vessel with petrol in order to discover any leaks more easily Test the pressure at 50 kPa No leakage is permitted In the event of leakage remove the needle valve In the event of leakage remove the needle valve Loosen the bolt and r...

Page 28: ...gm Check the diaphragm for damage Remove the fuel screen and clean it or attach a new one Remove the bolt holding the cover over the pump diaphragm Lift off the cover A the gasket B and the diaphragm C Check the diaphragm for damage to the valve tongues If the valve tongues are bent the pump will not function in a satis factory manner Hold it up to a light as well to discover any holes in the mate...

Page 29: ...se the small washers A NOTE Note how the jets are positioned For example the H needle is a little shorter than the L needle Dismantle the main jet A and the plug B Press out the main jet A with a suitable punch Remove the plug B Carefully drill a small hole Ø 2 mm in the plug and pry it up with a pointed object Check valves and dampers for wear Replace if required Remove the valves and dampers If ...

Page 30: ...g Fit a new main jet Mount the valves and dampers Tip Any numbers on the valves should be able to be read from the outside Replace the fuel screen if it is damaged or cannot be cleaned Place the pump diaphragm closest to the carburettor housing Then the gasket and cover and the other components in reverse order of removal NOTE Check that the valves are turned correctly and that they close complete...

Page 31: ...burettor Pump up the pressure to 50 kPa Lower the carburettor in a vessel with petrol in order to discover any leaks more easily No leakage is permitted Attach the control diaphragm and cover Place the gasket on the carburettor housing and then the control diaphragm Check that the air hole in the cover is open and screw the cover on Assembly Secure the seal on the carburettor and connect the fuel ...

Page 32: ...t speeds run steadily while idling and to react quickly when accelerating The setting of the carburettor can vary a little depending on the humidity temperature and air pressure L Low speed needle H High speed needle T Idle adjustment screw The fuel quantity in relation to the air flow permitted by the throttle opening is ad justed by the L and H jets Turning the needles clockwise gives a leaner f...

Page 33: ...rettor should be carried out after the engine has been run in The engine must also be run warm for 4 to 5 minutes The carburettor setting must be carried out in two steps and in various ways depending on the type of cutting attachment fitted With a trimmer head H needle Step 1 Twist the needle to the position where the engine is almost running as a 4 stroke Step 2 With the engine turned off then t...

Page 34: ...he clutch cover Remove the throttle from the shaft Remove both screws A one on each side Remove the screws B and pull away the shaft with the throttle from the clutch cover Loosen the 3 front screws C approx 2 turns holding the throttle halves and pull the throttle off of the shaft Remove the screws holding the throttle to gether and carefully separate the halves Note how the different parts are f...

Page 35: ...e throttle halves using the 5 screws but do not tighten them fully before the throttle has been positioned on the shaft Assemble the remaining parts in the re verse order as set out for dismantling Throttle model 327 Separate the engine body and the clutch cover Remove the screws A and B Lift off the covers C Throttle model 327 We recommend that the throttle is dis mantled from the engine and shaf...

Page 36: ...itted and remove the throttle lever Remove the throttle trigger lock H and the vibration element I Assemble in the reverse order as set out for dismantling Do not forget to put the vibration dampers E and I in place Check that the throttle cable is fitted to the underside of the pin J on the throttle trigger lock See also the Throttle model 326 assem bly section Check that the throttle cable is fi...

Page 37: ...alve s lever Lever arm damaged Lever arm too high Lever arm too low Lever arm does not work correctly Needle valve s spring The spring is deformed The spring is not fitted correctly Control diaphragm Diaphragm is damaged Faulty seal Needle valve Valve jams Valve worn Foreign object in the valve guide Diffi cult to start Flooding fuel leakage Diffi cult to prime when starting Engine does not idle I...

Page 38: ...______________________________________ 38 Assembly ________________________________________ 38 Replacing the clutch drum and drive axle model 326 ____ 39 Replacing the clutch drum model 327 LS 327 P5 ________ 40 Replacing the vibration damper model 327 ____________ 40 ...

Page 39: ...out the cutting equipment s drive shaft rotating Dismantling Dismantle the clutch by following the instructions in the chapter Electrical system Dismantling The centrifugal clutch is bolted to the flywheel Follow the detailed instructions in the chapter Electrical system when the clutch is to be dismantled Twist apart the clutch and inspect the different parts with regard to wear or damage Twist a...

Page 40: ...he reverse order as set out for dismantling Use Loctite intended for mounting bea rings when the bearing is mounted in the clutch cover Replacing the clutch drum and drive axle Model 326 Separate the shaft from the clutch cover Pull away the clutch cover complete with drive axle and clutch drum The drum is bolted on the drive axle and can be dismantled using tool 502 52 16 01 The clutch drum shoul...

Page 41: ...utch drum in the clutch cover is glued in position with Loctite To replace the bearing heat the cover to approx 100 C using a hot air gun to loosen the glue Dismantle the bearing using an appro priate punch and hammer Check wear on the clutch drum It should be replaced if the diameter ex ceeds Ø 64 1 mm Assemble in the reverse order as set out for dismantling Use Loctite intended for mounting bea ...

Page 42: ...______________________ 43 Branch saw Dismantling drive end ____________________________ 44 Assembly drive end ______________________________ 45 Dismantling oil pump end _________________________ 46 Dismantling input shaft ___________________________ 46 Dismantling output shaft _________________________ 47 Assembly oil pump end ___________________________ 48 ...

Page 43: ...Remove the cutting equipment and guard 2 Remove the screw A and lift off the plate B 3 Loosen the screw C holding the angle gear on the shaft and remove the angle gear Remove the circlips holding the bearings on the input respective output shafts Heat the entire angle gear to approx 110 C and first dismantle the input axle and then the output axle 4 Remove the support washers and the dust protecti...

Page 44: ...gs so this side faces outwards Heat the gearbox to approx 110 C and first place the output axle in position and then the input axle Make sure the bearing bottoms in its seating Fit the circlips B and C Make sure they lie correctly in their grooves Assemble remaining parts in the reverse order as set out for dismantling NOTE Do not forget the circlip A holding the bearing on the input axle Dismantl...

Page 45: ...ding the chain sprocket Remove the support washer D from inside the drive disc Separate the drive disc and the chain sprocket Press the drive disc and the chain sprock et apart using your thumbs Be careful not to lose the rubber plugs E Inspect all parts Replace worn or damaged components with new ones Position the drive disc C and the chain socket F together Press the rubber plugs E into the resp...

Page 46: ...n The pin screw C must first be removed to replace the wear guard plate A or the chain adjuster screw B Prise off the guard plate using a screwdri ver Lift off the chain adjuster screw and the rubber oil channel Assembling drive end Clean and inspect all components and replace if damaged or worn Assemble in the reverse order as set out for dismantling Be observant of the following 1 Check that the...

Page 47: ...is laid and remove it from the nipple A using a flat nosed pliers Remove the large circlip B holding the ball bearing on the output shaft Remove the oil pump once the screw A is removed Remove the screw A and heat the saw body to approximately 110 C using a hot air gun Carefully prise off the pump hou sing B with the help of a screwdriver Take the oil pump apart Be careful not to lose the two wash...

Page 48: ...dy against a wooden block so that the input shaft falls out TIP Make sure the clamping screw is screwed out far enough to allow the flare fitting to expand when hot and thereby prevent the ball bearings from passing through Heat the saw body to 110 C with a hot air gun Knock the saw body against a wooden block so that the input shaft falls out Remove the circlip with circlip pliers and remove both...

Page 49: ...4 01 Heat the saw body to about 100 C and slide both shafts in their respective posi tion and fit the circlips B holding the ball bearings Check the shafts to make sure that they can rotate freely Push the oil pump into its position and tighten the locking screw Fit the oil hose with the attached screen and note how the hose is drawn Make sure the locking spring A tightens the hose properly at the...

Page 50: ..._______________ 50 Cleaning inspection _______________________________ 51 Analysis and actions________________________________ 52 Service tips _______________________________________ 56 Wear tolerances ___________________________________ 57 Assembly ________________________________________ 57 ...

Page 51: ...aking valves leaking valve guides damaged piston rings or a damaged piston Dismantling Dismantle all parts around the cylinder incl the distance piece with attached carburettor Dismantling Dismantle the following parts Cylinder cover muffler grille muffler with heat guard plate starter and spark plug Move the fuel tank Now remove the 2 screws holding the distance piece against the crankcase and th...

Page 52: ...so see the Analysis and actions section Check the piston ring for wear and possible breakage Also see the Analysis and measures section Check the gudgeon pin If it has blued it must be replaced If the piston moves too easily both the piston and the gudgeon pin must be replaced Check the needle bearing If it is discoloured or damaged it must be replaced Check the circlips If they exhibit cracks or ...

Page 53: ... in the fuel Too low octane fuel Air leaks Cracked fuel hose Leaking inlet gaskets Cracked distance piece or inlet mani fold Air leakage in engine body Leaking crankshaft seals Leaking cylinder and crankcase gas kets Poor maintenance Dirty cooling fins on the cylinder Blocked air intake on the starter Blocked spark arrestor mesh in the muffler For the best results we recommend Husqvarna two stroke...

Page 54: ... rings broken circlip on the gudgeon pin faulty bearings or that the guide pin for the piston ring has become loose Piston ring breakage A too lean carburettor setting results in a too high speed and a high piston temperatu re If the piston temperature rises above the normal working temperature the piston ring can seize in its groove consequently it will not sit deep enough in its groove The edges...

Page 55: ...mer against the guide pin when the piston ring moves in its groove The intensive hammering can drive out the pin through the top of the piston causing serious damage also to the cylinder Damage caused by gudgeon pin circlips A too high engine speed can cause the gudgeon pin circlips to vibrate The circlips are drawn out of their grooves due to the vibrations which in turn reduces the circlips tens...

Page 56: ...the right cleaning agent such as tepid soapy wa ter Change the filter Larger softer particles that penetrate into the engine cause damage to the piston skirt under the piston ring as the illustration shows Cause Air filter incorrectly fitted Air filter damaged or missing Action Fit the air filter correctly Fit a new air filter Inlet side Particles of dust and dirt from carbon like deposits on the ...

Page 57: ...ylinder should be replaced Carefully loosen the piston rings and clean the groove well before refitting Carbon deposits in the groove impair the important heat transfer between the piston and cylinder NOTE Be careful with the lower edge of the piston ring groove If this is damaged or if carbon deposits remain the compression pressure can leak through Check the wear on the piston ring by placing it...

Page 58: ...n der and the place the unit on the crank case Check that both gasket halves are unda maged and are positioned correctly on the crankcase also see chapter 7 Lubricate the piston using a few drops of oil and carefully slide the cylinder over the piston NOTE Do not turn the cylinder as the piston rings can easily be broken Check that the cylinder is fitted so that the crankshaft s ball bearing is in...

Page 59: ...6 58 Cylinder and piston ...

Page 60: ... and crankcase Contents Dismantling ______________________________________ 60 Inspecting the crankshaft ___________________________ 60 Assembly ________________________________________ 61 Leakage testing the crankcase________________________ 62 ...

Page 61: ...r and is forced into the cylinder s combustion chamber The crankcase must be perfectly sealed so as not to affect this pump function There cannot be any leakage from the crankshaft between the crankcase halves or between the crankcase and the cylinder Always replace the sealing rings and gaskets when servicing the crankcase Dismantling Dismantle all components so that only the crankcase and cranks...

Page 62: ...e are heavy indentation marks in the seal casing the holder must be replaced as leakage can otherwise oc cur between the crankcase and bearing If the bearing is free from defects but the rubber covering on the sealing ring holder is damaged the holder can be dismantled from the bearing Carefully saw a slot in the cover with a hacksaw and pry off the sealing ring holder Assembly Check the crankshaf...

Page 63: ...s in the reverse order as set out for dismantling See respective sections if necessary in the Workshop Manual Leakage testing the crankcase Remove the cylinder cover spark plug and grille over the muffler Loosen the screws holding the carburet tor sufficiently so that the sealing plate no 502 54 11 02 A can be slid down between the carburettor and partition It may be necessary to carefully pry out...

Page 64: ...0 2 kp cm2 per 30 seconds Connect meter 531 03 06 23 to the nipple and lower the pressure in the crankcase to 50 kPa 0 5 kp cm2 Max permitted leakage 20 kPa 0 2 kp cm2 per 30 seconds Any leakage can be difficult to localise if the crankcase is depressurised When leakage has been established with a vacuum you can apply a slight overpres sure 0 1 0 3 kp cm2 and at the same time apply a layer of thin...

Page 65: ...7 64 Crankshaft and crankcase ...

Page 66: ...________________66 Fuel system___________________________________66 Centrifugal clutch______________________________66 Bevel gear Cutting attachment __________________67 Cylinder and piston ____________________________67 Crankshaft and crankcase _______________________67 Workshop equipment __________________________67 ...

Page 67: ... 50 83 01 505 69 85 70 502 52 16 01 502 50 18 01 502 50 18 01 504 62 29 01 plast 502 54 15 01 502 50 64 01 502 50 64 01 502 51 49 01 540 06 82 01 zink 531 00 48 63 531 03 03 98 502 50 18 01 List of tools 1 2 2 3 4 Electrical system Centrifugal clutch Starter Fuel system Electrical system ...

Page 68: ... 03 01 502 71 14 01 503 97 64 01 531 03 06 23 502 50 18 01 505 69 85 70 101 64 23 48 505 38 17 05 531 03 06 23 502 50 18 01 List of tools Bevel gear Cutting attachment 5 6 7 8 Cylinder and piston Crankshaft and crankcase Workshop equipment ...

Page 69: ...8 68 List of tools ...

Page 70: ..._______________________70 Ignition system _______________________________70 Carburettor___________________________________70 Clutch _______________________________________70 Driving ______________________________________70 Dimensions___________________________________70 ...

Page 71: ...turns 2 25 2 25 Basic setting L needle turns 1 5 1 5 Idle speed rpm 2700 2700 Max speed rpm 11700 11700 Air filter type Foam LS paper Foam LS paper Throttle control type Index finger throttle Index finger throttle Clutch 2 shoe clutch Diameter mm 61 0 61 0 Engage speed rpm 3800 3800 Driving Angle gear degrees 30 30 Angle gear gear ratio 1 1 46 1 1 46 Control drive disc mm 25 4 25 4 Shaft diameter ...

Page 72: ...115 43 48 26 2018W35 ...

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