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Husqvarna 123HD60, Руководство по ремонту

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6

38

Cylinder and piston

Foreign objects

Everything other than clean air and pure fuel that enters the engine’s inlet port causes 
some type of abnormal wear or damage to the cylinder and piston. 

This type of increased wear shows on the piston’s inlet side starting at the lower edge of 
the piston skirt.

The damage is caused by badly 

fi

 ltered air that passes through the carburettor and into 

the engine.

Small score marks and a matt, grey surface 
on the piston’s inlet side caused by fi ne 
dust particles.

The guide pin for the piston ring has been 
pushed up through the top of piston.

Irregular grooves on the piston’s inlet side 
caused by a broken roller retainer.

Deep, irregular grooves caused by a loose 
circlip. Shown here on the piston’s inlet side.

Piston ring guide pin 
vibrated loose

A too high engine speed can cause the 
ends of the piston ring to hammer 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’ tensioning power. The rings 
can then become loose and damage the 
piston.

Bearing failure

Failure of the crankshaft bearing or on 
the connecting rod bearing is usually 
caused by a too high engine speed, 
resulting in the bearing being overloaded 
or overheating. This in turn can cause the 
bearing rollers or ball to glide instead of 
rotate, which can cause the roller or ball 
retainer to break.

The broken debris can be trapped 
between the piston and cylinder wall, 
damaging the piston skirt.

Debris can also pass up through the 
cylinder’s transfer channels and cause 
damage to the top and sides of the piston 
as well as to the cylinder’s combustion 
chamber.

Содержание 123HD60

Страница 1: ...Workshop manual 123HD60 123HD65X English ...

Страница 2: ......

Страница 3: ...___________ 13 4 Centrifugal clutch _______________________ 25 5 Cutting deck ___________________________ 29 6 Cylinder and piston ______________________ 33 7 Crankshaft and crankcase ________________ 43 8 Tools _________________________________ 49 9 Technical Data _________________________ 53 Workshop Manual Hedge trimmer Model 123 HD60 123 HD65X Husqvarna AB Sweden 2010 Contents ...

Страница 4: ...t approved by Husqvarna can result in the failure to meet these safety demands and that the person carrying out assembly bears responsibility for this Fire risk Handle fuel with respect as it is extremely inflammable Never refuel while the engine is running Do not smoke and ensure there are no open flames or sparks in the vicinity Never start the engine if the machine is leaking fuel or if there h...

Страница 5: ...1 3 1 Starter Starter Contents Dismantling ___________________________________ 4 Assembly_____________________________________ 5 Replacing the drive _____________________________ 6 ...

Страница 6: ...ter cord about 30 cm Slow the starter pulley with your thumb Lift the starter cord up out of the cut out on the starter pulley Let the starter pulley rotate backwards until the spring tension ceases WARNING Wear protective glasses The return spring lies tensioned in the starter housing and can fly out and cause personal injury with careless handling Remove the screw A and lift off the drive disc B...

Страница 7: ...de so that the steel wire A slides off the spring The pressure equalisation spring is sup plied as a spare part fitted to the starter pulley Lubricate the return spring and position the starter pulley Lubricate the return spring and the star ter pulley s stub axle with cold resistant grease or thin oil Move the starter cord through the guide in the starter housing A Guide the free end of the retur...

Страница 8: ... Replace the drive dogs if they are worn or defective Prize off the circlip using a small screw driver Assemble in the reverse order as set out for dismantling Fit the starter in place on the fan housing cover and check that it works Do not forget the plate washer under the starter Turn the washer so that the protruding collar faces down towards the flywheel Tighten the return spring Check the spr...

Страница 9: ...2 7 2 Electrical system Electrical system Contents Checking the ignition spark ______________________ 8 Dismantling __________________________________ 11 Assembly __________________________________ 12 ...

Страница 10: ...ck the electrode gap It should be 0 6 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 when attempti...

Страница 11: ... 502 50 06 01 to make a hole in the ignition cable When a part of the ignition lead has been cut off it helps to use pliers no 502 50 06 01 to make a new hole in the ignition lead to fit the contact coil NOTE It is important that the tip of the ignition coil hits the centre of the ignition cable to prevent sparking Attach the ignition coil to the ignition cable Attach the ignition coil to the igni...

Страница 12: ...ure that the cables are correctly drawn 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 fly wheel magnet and the ignition module The gap should be 0 3 mm Use air gap gauge 502 51 34 02 Adjust the air gap Adjust the air gap to the right measure...

Страница 13: ...er A and the cylinder cover B Separate the short circuit cables C Remove the screws D and remove the ignition module E NOTE Do not lose the insulation sleeves that are placed between the ignition module and the cylinder Fit the piston stop 522 43 18 01 and dismantle the drive disc cup Fit the piston stop 522 43 18 01 in the spark plug hole Remove both screws F and remove the drive disc cup NOTE Pl...

Страница 14: ...ition module Adjust the air gap to 0 3 mm Adjust the air gap There should be 0 3 mm between the permanent magnets in the flywheel and the ignition module Tighten the screws that hold the ignition module in place and check the air gap once again Assemble other parts in the reverse order as set out for dismantling Assembly Check that the key and the key slot in the crankshaft are undamaged Assemble ...

Страница 15: ...________________ 15 Fuel filter ____________________________________ 15 Carburettor __________________________________ 16 Assembly ___________________________________ 20 Carburettor settings ___________________________ 20 Throttle handle _______________________________ 21 Trouble Shooting Guide ________________________ 23 ...

Страница 16: ...ir filter Fold the cover over the air filter to one side Press in the lock lid with your thumb and fold up the cover WARNING Do not clean not the filter with petrol Hazardous NOTE Make sure that the air filter is free of cleaning agent before it is impregnated with air filter oil TIP Use Husqvarna s cleaning agent Active Cleaning no 505 69 85 70 Impregnate the filter with air filter oil Impregnate...

Страница 17: ... sure the seal D is not damaged Fuel filter The fuel hose in the tank contains a fuel filter It is accessible through the fill hole Pull out the filter using tool 502 50 83 01 If the filter is not too dirty its surface can be cleaned with a brush Otherwise it must be replaced Check the fuel hose for cracks and leaks Make sure that the filter s connection neck is inserted as far as possible into th...

Страница 18: ... around the carburettor 3 Disconnect the throttle cable A from the carburettor s lever arm B 4 Dismantle the fuel hoses from the carburettor and note how they are con nected so that the fuel pump works as intended 5 Remove the carburettor screws 6 Lift off the air filter holder C 7 Remove the attachment for the throttle cable s adjustment screw D 8 Remove the carburettor Dismantling the carburetto...

Страница 19: ...ng and check that the channels are open Check that the non return valve s seals D are undamaged by carefully squeezing the short sides together Replace the valve if necessary With the help of the fuel pump s bellows press fuel through the carburettor and fill all ducts with fuel With the help of the fuel pump s bellows press fuel through the carburettor and fill all ducts with fuel Any vapour bubb...

Страница 20: ...aphragm and partly by the cut outs for the needle valve Also check wear to the tip of the needle valve and the groove for the lever arm Replace damaged parts with new parts Replace the needle valve s seat Press out the needle valve s seat for replacement Use a suitable punch Ø 4 5 mm NOTE Replace the seat needle valve and lever arm at the same time The needle valve s seat should be pressed in leve...

Страница 21: ... the carburettor Clean and inspect all parts Worn or damaged parts are replaced with new ones Pay attention to the following when the carburettor is assembled in the reverse order to dismantling The screen A has to be cleaned and undamaged Check that the carburettor is sealed Connect the pressure tester no 531 03 06 23 to the fuel inlet B on the carburettor Pump up the pressure to 50 kPa Lower the...

Страница 22: ...t and protective plate in place Connect the fuel hoses Put the carburettor gasket on the protec tive plate A Place the air filter holder and the screws on the carburettor and tighten them Connect the throttle cable B Connect the fuel hoses to the carburettor Place the gasket A on the protective plate and fasten it with a little grease Place th air filter holder and the carburet tor screws on the c...

Страница 23: ... incl the adjustment screw 2 Separate the short circuit cables 3 Remove the lockwasher A that holds the throttle handle against the engine frame by prizing it open using a screwdriver that it inserted into the oval opening 4 Pull off the throttle handle from the engine frame Remove the 4 screws and carefully sepa rate both handle halves 5 Remove the 4 screws holding the handle halves together 6 Ca...

Страница 24: ...t in the opposite direction the lock G that prevents handle rotation Assemble the throttle handle in the re verse order as set out for dismantling Note the following Make sure that the short circuit cable is properly pressed into the handle half so that it is jammed in place Lubricate the O ring with a little grease so that the handle is easy to twist ...

Страница 25: ...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...

Страница 26: ...3 24 Fuel system ...

Страница 27: ...25 4 Centrifugal clutch Centrifugal clutch Contents Centrifugal clutch dismantling __________________ 26 Centrifugal clutch assembling __________________ 27 Clutch drum ________________________________ 27 ...

Страница 28: ...d so that the engine can idle without the cutting equipment s drive shaft rotating Centrifugal clutch Dismantling Disconnect the throttle cable and sepa rate the connections on the short circuit cables Remove the screws holding the engine to the vibrational dampers Lift out the engine Centrifugal clutch Dismantling Unhook the throttle cable from the carbu rettor and separate the connections to the...

Страница 29: ...t out for dismantling The key grip on the clutch must face in toward the crankcase Clutch drum Remove the cutting knives and the con tents of the gear housing Clutch drum To dismantle the clutch drum the cutting knives and gear housing contents must be removed first see also the Cutting deck chapter Remove the 4 screws A holding together the cutting knives the bar and the knife protector remove th...

Страница 30: ... a suit able mandrel Check the inside diameter of the clutch drum If it exceeds 55 0 mm it should be replaced Check the clutch drum for wear The diameter must not exceed 55 0 mm If this is the case replace the clutch drum Assemble the different components in the reverse order as set out for dismantling Heat the gear housing before the ball bearings are fitted Assemble the different components in t...

Страница 31: ...5 29 5 Cutting deck Cutting deck Contents Cutting deck disassembly _____________________ 30 Cutting deck assembly _______________________ 32 ...

Страница 32: ...and separate the connections to the short circuit cable Remove the 4 screws holding the engine to the vibrational dampers Lift out the engine and the fitted cutting deck Remove the cutting deck from the engine Remove the three screws A and lift out the cutting deck from the engine Remove the knife protector cutting knives and the cover over the gear housing Remove the 4 screws A holding together t...

Страница 33: ...ng deck Remove the crank rod C the sealing felt D and the cutting knives E Lift up the lower crank rod completely with sprocket and eccentric cam F This gives access to the screws G for dismantling the chain bar ...

Страница 34: ...or information on the small gear wheel Assembly Clean and inspect all components for wear and damage Assemble in the reverse order as set out for dismantling NOTE Make sure that the 4 screws holding the cutting knives together are not tightened too much so that the knives or not locked and can move freely Fill the gear housing with grease no 531 00 92 05 Lubricate the friction surfaces of the cut ...

Страница 35: ...__________________________ 34 Cleaning inspection ___________________________ 35 Analysis and actions __________________________ 36 Service tips _________________________________ 40 Wear tolerances _____________________________ 41 Assembly __________________________________ 41 ...

Страница 36: ...e and sepa rate the connections on the short circuit cables Remove the screws holding the engine to the vibrational dampers Lift out the engine Dismantling Do the following to facilitate the process Unhook the throttle cable from the carbu rettor and separate the connections to the short circuit cable Remove the 4 screws holding the engine to the vibrational dampers Lift out the engine and the fit...

Страница 37: ...combustion chamber 3 Scrape carbon deposits from the cylinder s exhaust port 4 Wash all the components 5 Inspect the different components for damage and wear Check the piston and cylinder for seizure damage and wear Also see the Analysis and actions section Check the piston ring for wear and possible breakage Also see the Analysis and actions section Check the gudgeon pin If it has blued it must b...

Страница 38: ...e 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 oil or ready mixed fuel that is specially developed for air cooled two stroke engines Mixing ratio 1 50 2 If Husqvarna two stroke oil ...

Страница 39: ...de 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 of the piston ring can then hit the top edge of the exhaust port and be...

Страница 40: ...o hammer 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...

Страница 41: ...orrectly fitted Air filter damaged or missing 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 firmly 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 sid...

Страница 42: ...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 in the lower part of the cylinder bore Position a suitable p...

Страница 43: ...Assemble the cylinder with the help of as sembly set 502 50 70 01 Check that the pulse channel in the cylin der is open Place a new cylinder base gasket on the cylinder or the crankcase Lubricate the piston and the crank bearing with a few drops of engine oil Assemble the cylinder with the help of the piston ring compressor in the assembly set 502 50 70 01 NOTE Do not turn the cylinder as the pist...

Страница 44: ...n leakage which in turn can cause uneven idling and starting difficulties Check that the impulse channel A is open all the way through the gaskets and the heat protective plate to the cylinder Assemble the remaining parts in the re verse order as set out for dismantling See respective sections in the manual ...

Страница 45: ... 7 Crankshaft and crankcase Crankshaft and crankcase Contents Dismantling ________________________________ 44 Inspecting the crankshaft______________________ 45 Assembly _________________________________ 46 ...

Страница 46: ...y 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 crankshaft remain Remove the 4 screws holding the clutch housing against the crankcase Dism...

Страница 47: ...ock the crankcase half against a woo den block so that the ball bearing falls out Knock the crankcase half against a woo den block so that the ball bearing falls out Inspecting the crankshaft Inspect the large end of the connecting rod Inspecting the crankshaft The crankshaft cannot be reconditioned but must be replaced if it is worn or dama ged Inspect the large end of the connecting rod If seizu...

Страница 48: ... Mount the bearings in the crankcase halves Assembly Mount the bearings in the crankcase halves Heat the crankcase halves to approx 110 C using a hot air gun Put the ball bearings in position Use a suitable punch and hammer if needed Make sure the bearing rests against the circlip and shoulder in the bearing seating Fit the sealing rings in the crankcase halves Fit the sealing rings in the crankca...

Страница 49: ... crankcase screws a little at a time Check that the crankshaft can rotate easily Assemble the piston Attach the flywheel Position the cylinder base gasket Assemble the piston on the connecting rod Check that the piston is turned so the ar row points towards the exhaust port Make sure that the gudgeon pin circlips are seated correctly in the slots Place the flywheel key in position in the crankshaf...

Страница 50: ...7 48 Crankshaft and crankcase ...

Страница 51: ...______________________ 50 Fuel system ______________________________ 50 Centrifugal clutch__________________________ 51 Cutting deck _____________________________ 51 Cylinder and piston ________________________ 51 Crankshaft and crankcase___________________ 51 Workshop equipment_______________________ 51 ...

Страница 52: ...1 502 50 18 01 0 3 502 51 34 02 502 50 19 01 522 43 18 01 502 50 19 01 505 69 85 70 531 00 60 76 531 03 06 23 502 50 83 01 502 50 19 01 502 02 61 02 502 71 14 01 501 60 02 03 522 43 18 01 List of tools Electrical system Starter Fuel system Fuel system Electrical system ...

Страница 53: ...01 544 13 05 01 544 13 08 01 544 13 09 01 544 13 10 01 544 34 87 01 531 03 06 23 502 71 14 01 502 50 23 01 505 38 13 08 576 95 40 01 576 95 41 01 List of tools Centrifugal clutch Cutting deck Cylinder and piston Crankshaft and crankcase Workshop equipment 502 50 18 01 522 43 18 01 505 38 13 08 ...

Страница 54: ...52 8 List of tools ...

Страница 55: ...____________________________ 54 Ignition system____________________________ 54 Carburettor ______________________________ 54 Clutch __________________________________ 54 Cutting equipment _________________________ 54 Dimensions ______________________________ 54 ...

Страница 56: ... BPMR 6Y NGK BPMR 6Y Electrode distance mm 0 7 0 7 Electronic speed limitation No No Carburettor Manufacturer Walbro WYL Walbro WYL Idle speed rpm 3000 3000 Max speed rpm 12000 12000 Clutch 2 shoe clutch Diameter mm 51 5 51 5 Engage speed rpm 4200 4200 Cutting equipment Cutters Double sided Double sided Blade length mm 550 600 Cutting frequency cuts min 3765 3765 Dimensions Fuel tank volume litre ...

Страница 57: ......

Страница 58: ...2010W40 115 39 91 26 ...

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