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Husqvarna 343R, 345RX, 343F, 345FX, 345FXT manual Fuel system

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

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In the event of leakage – remove the needle valve.

Fuel system

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In the event of leakage – remove the needle valve.

Check the needle valve and the lever arm for damage or wear.

Replace damaged components with new ones.

Remove the pump diaphragm. Check the diaphragm for damage.

Remove the fuel screen and clean it or attach a new one.

In the event of leakage – remove the needle valve.

Loosen the bolt and remove the lever arm, axle, needle valve and spring.

Check the needle valve for damage on the tip and in the lever arm groove.

Check the lever arm for damage to the groove for the needle valve and wear on the mounting points towards the control diaphragm.

Replace damaged components with new ones.

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 satisfactory manner.

Hold it up to a light as well to discover any holes in the material.

Carefully remove the fuel screen (D), using a needle for example. Clean or replace the fuel screen.

NOTE!

During assembly the pump diaphragm should lie closest to the carburettor housing.

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Husqvarna 343R, 345RX, 343F, 345FX, 345FXT manual Fuel system, In the event of leakage – remove the needle valve

Contents

343R 345RX 343F 345FX 345FXT EnglishWorkshop manual 1.Starter __________________________________ Model 343R, 345RX, 343F, 345FX, 345FXT ContentsGeneral recommendations ___________________ 2.Electrical system _________________________Special tools General recommendationsRemember Fire riskContents 1 StarterDismantling 1StarterDismantling Starter AssemblyAssembly 1Starter Replacing the drive dogsReplacing 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 _________________________Air filter Fuel systemAir 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 DismantlingAssembly 503 97Angle 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 _________________Dismantling Crankshaft and crankcaseDismantling 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 bolts503 55 Husqvarna E-TechCrankshaft and crankcase Page Starter __________________________________ ToolsContents Electrical system __________________________Starter List of tools505 38 ElectricalCrankshaft List of toolsgear Workshop114 01 2003W24