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Husqvarna 343R, 345RX, 343F, 345FX, 345FXT manual Crankshaft and crankcase, 502 52

Models: 343R, 345RX, 343F, 345FX, 345FXT

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Page 54

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Crankshaft and crankcase

Separate the crankcase halves.

502 52 39-01

Push out the crankshaft from the crankcase half.

Remove the bearing and sealing rings from the crankcase halves.

505 38 17-09

Fit tool 502 52 39-01 to the clutch side of the crankcase as illustrated.

Separate the crankcase halves.

Fit tool 502 52 39-01 as illustrated.

Push out the crankshaft from the crankcase half.

Heat the crankcase halves to approx. 150°C using a hot air gun.

Knock the halves against a wooden block so that the bearings fall out of their seats.

Remove the gaskets with a suitable punch.

Page 54

Image 54

Husqvarna 343R, 345RX, 343F, 345FX, 345FXT manual Crankshaft and crankcase, 502 52

Contents

English 343R 345RX 343F 345FX 345FXTWorkshop manual 1.Starter __________________________________ Model 343R, 345RX, 343F, 345FX, 345FXT ContentsGeneral recommendations ___________________ 2.Electrical system _________________________Special tools General recommendationsRemember Fire riskContents 1 Starter1Starter DismantlingDismantling Assembly StarterAssembly Replacing the drive dogs 1StarterReplacing the drive dogs Assembly _________________________________ Electrical systemContents Checking the ignition spark ____________________502 71 Electrical systemChecking the ignition spark Checking the ignition sparkElectrical system 502 50 Replacing the sparkplug cover Electrical systemDismantling 502 54Electrical system DismantlingDo not pry off the heating element Drive dogsHeated handles before the locking catch has beenWiring diagram Electrical systemElectrical system Assembly _________________________________ Fuel systemContents Carburettor settings _________________________Fuel system Air filterAir filter Massage the oil into the air filter Tank ventingFuel filter Fuel systemDismantling Fuel pumpCarburettor Fuel systemThe blending unit The carburettor’s designThe metering unit Fuel systemFuel system The pump unitDismantling the carburettor The pump unitFuel system In the event of leakage – remove the needle valveFor example, the H-needleis a Note how the jets arepositioned little shorter than the L-needleFuel system Assembling the carburettorUse Loctite on the valve screws Assembling the carburettorthan the L-needle are not bent or pinched when theThe H-needleis a little shorter Check carefully that the fuel hosesFine adjustment Carburettor settingsBasic setting FunctionThe recommended max. speed must not be exceeded settingCorrectly adjusted carburettor Idling speed T-screwAdjusting the L-needle Carburettor adjustment 345RX/FXadjustment 345RX/FX Adjusting the HCheck for wear on pins A and B Fuel systemDisassemble the throttle control A, the lock to prevent accidental throttle operation B, the start throttle lock C and the throttle stop D in order to check if replacement is necessary Fuel systemPage Assembly _________________________________ 4 Centrifugal clutchContents Dismantling ________________________________Dismantling Centrifugal clutch502 21 DismantlingCentrifugal clutch 502 54Assembly Clutch drum502 11 AssemblyChange the bearings in the clutch housing if necessary Centrifugal clutchPage Assembly _________________________________ 5 Angle gearContents Dismantling ________________________________Dismantling Angle gearLet the small circlip around the axle remain Dismantling503 97 AssemblyAngle gear Angle gear Shaft503 80 ShaftCleaning, inspection _________________________ 6 Cylinder and pistonContents Assembly _________________________________Cylinder and piston DismantlingCylinder and piston Turn the valve the right way when fittingDecompression valve Decompression valveInlet manifold Cleaning, inspectionmanifold is fitted using a Exercise caution if the inletCause Analysis and actionsInsufficient lubrication ActionCause Piston scoring caused by heavy carbon depositsCylinder and piston ActionPiston ring guide pin Piston damage caused by a too high engine speedPiston ring breakage Damage caused byCause Foreign objectsCylinder and piston ActionBe careful with the lower edge of the piston ring Service tipsDefect groove. If this is damaged, or if carbon depositsPiston ring gap Wear tolerancesCylinder bore Piston ring grooveAssembly _________________________________ 7 Crankshaft and crankcaseContents Leakage testing the crankcase _________________Crankshaft and crankcase DismantlingDismantling Crankshaft and crankcase 502 52Crankshaft and crankcase Inspecting thecrankshaft Inspecting theCrankshaft and crankcase AssemblyAssembly 502 50Press down the sealing plates as Leakage testing thecrankcase far as possible between the boltsHusqvarna E-Tech 503 55Crankshaft and crankcase Page Starter __________________________________ ToolsContents Electrical system __________________________Starter List of tools505 38 ElectricalCrankshaft List of toolsgear Workshop114 01 2003W24