Husqvarna 343F, 345FX, 345FXT, 343R, 345RX manual Tank venting, Fuel filter

Page 18

Fuel system

3

Impregnate the filter with air filter oil.

531 00 60-76

Tank venting

Check that the tank venting valve works correctly.

Replace the fuel cap if the valve is faulty.

531 03 06-23

Fuel filter

The fuel filter can be removed through the tank’s fill hole.

502 50 83-01

Impregnate the filter with air filter oil.

Tip!

Place the filter in a plastic bag and pour about a tablespoon of air filter oil no. 531 00 60-76 into the bag.

Massage the oil into the air filter.

Tank venting

Tank venting takes place through the fuel cap and needs to be functional for the engine to work.

•Remove the fuel hose from the carburettor and empty the fuel from the tank.

•Connect the fuel hose to pressure tester no. 531 03 06-23.

•Pump up a pressure and vacuum of 50 kPa (0.5 bar) in the tank.

•The pressure should sink to 20 kPa or return to normal pressure within 45 seconds.

The fuel cap can be taken apart for cleaning.

Use a screwdriver and prise off the housing (A) that contains a rubber diaphragm (B) and a filter (C).

Knock the housing against a tabletop so that the cover (D) over the dia- phragm 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 cover (D) is turned towards the dia- phragm.

Fuel filter

The fuel hose in the tank contains a fuel filter. It is accessible through the fill hole. Pull out the filter with your fingers or with help of tool 502 50 83-01.

NOTE!

The fuel filter can snag under the shaft bushing in the tank. With the aid of a long screwdriver, loosen the filter. Do not pull on the hose, since it can easily be pulled from the filter.

17

Image 18

Contents English Model 343R, 345RX, 343F, 345FX, 345FXT Contents Workshop Manual Brushcutter, TrimmerGeneral recommendations Contents Starter1Starter DismantlingAssembly StarterReplacing the drive dogs Electrical system Electrical system Checking the ignition spark502 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 filterFuel pump CarburettorDismantling Carburettor’s design Metering unitBlending unit Pump unit Dismantling the carburettorFuel system Positioned For example, the H-needle is aLittle 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 whenCarburettor settings Basic settingFine 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 Turn the valve the right way when fitting When the valve is fitted the small hole must face outwardsDecompression valve Cleaning, inspection Inlet manifoldAnalysis and actions Insufficient lubricationCause 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