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

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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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Contents English Model 343R, 345RX, 343F, 345FX, 345FXT Contents Workshop Manual Brushcutter, TrimmerGeneral recommendations Contents Starter1Starter DismantlingAssembly StarterReplacing the drive dogs Electrical system Checking the ignition spark Electrical system502 71 Tip Replacing the spark Plug cover 502 50502 54 Drive dogs Heated handlesWiring diagram Electrical system Fuel system Fuel system Air filterTank venting Fuel filterCarburettor Fuel pumpDismantling Metering unit Carburettor’s designBlending unit Pump unit Dismantling the carburettorFuel system For example, the H-needle is a PositionedLittle shorter than the L-needle Assembling the carburettor Check carefully that the fuel hoses H-needle is a little shorterThan the L-needle Are not bent or pinched whenBasic setting Carburettor settingsFine adjustment Tachometer should always be used to find the optimal Setting Recommended max. speed must not be exceededCorrectly adjusted carburettor Idling speed T-screwThrottle Carburettor adjustment 345RX/FXAdjusting the L-needle Adjusting the H-needle RotatingCheck for wear on pins a and B Tip Page Centrifugal clutch Centrifugal clutch 502 21Centrifugal clutch Do not lose the sleeve bearings found in the clutch shoesClutch drum 502 11Change the bearings in the clutch housing if necessary Page Angle gear Angle gear Let the small circlip around the axle remain503 97 Input axle with pinion must be dismantled firstShaft 503 80Cylinder and piston Cylinder and piston When the valve is fitted the small hole must face outwards Turn the valve the right way when fittingDecompression valve Cleaning, inspection Inlet manifoldInsufficient lubrication Analysis and actionsCause Action Piston scoring caused by heavy carbon deposits Piston damage caused by a too high engine speed Piston ring breakageForeign objects CauseService tips Defect ActionWear tolerances Crankshaft and crankcase Crankshaft and crankcase Crankshaft and crankcase 502 52Inspecting Crankshaft Assembly Far as possible between the bolts Leakage testing CrankcasePress down the sealing plates as To ensure a proper sealHusqvarna E-Tech 503 55