Husqvarna 343R Manuale Utente Pagina 1

Workshop manual343R 345RX343F 345FX 345FXTEnglish

92Electrical systemStill no spark?Check the ignition cable’s connection tothe spark plug cover.Still no spark?Check the spark plug connection.Remove t

102502 50 06-01502 51 34-020.3Electrical systemReplacing the sparkplug cover1. Insert the ignition cable through thespark plug cover.2. Make a hole in

112502 51 94-01502 54 15-01502 50 18-01Electrical systemRemove the nut holding the flywheel.Remove the flywheel.Remove the nut holding the flywheel.Re

122502 51 34-020.3502 50 18-01502 50 18-01AssemblyCheck the key groove in the crankshaftand key in the flywheel. If damaged thecomponents must be repl

132Electrical systemSeparate the contacts (A-A) and (B-B).Then extend the cables (A) and (B) withapprox. 90 cm long steel wires attachedto the contact

142Electrical system

1533.ContentsAir filter ___________________________________ 16Tank venting _______________________________ 17Fuel filter _____________________________

163Fuel systemIn addition to the fuel tank and carburettor, the fuel systemconsists of the air filter, fuel filter and tank venting.All these componen

173531 03 06-23531 00 60-76502 50 83-01Tank ventingCheck that the tank venting valve workscorrectly.Replace the fuel cap if the valve isfaulty.Tank ve

183505 38 13-08 502 50 18-01CarburettorDismantlingBlow clean the carburettor compartment.Loosen the bolts (A) and remove thenuts (B).Remove the fuel h

1Workshop ManualBrushcutter, TrimmerModel 343R, 345RX, 343F, 345FX, 345FXTContentsGeneral recommendations ___________________ 21. Starter ____________

193Fuel systemRemove the throttle cable and fuel hosefrom the carburettor.Remove the carburettor.Remove the throttle cable from thecarburettor’s lever

203531 03 06-23Fuel systemPressure test the metering unit.Connect pressure tester 531 03 06-23to the fuel hose nipple.Lower the carburettor in a vesse

213Fuel systemCheck the needle valve and the leverarm for damage or wear.Replace damaged components withnew ones.Check the needle valve for damage ont

223Fuel systemDismantle the main jet (A) and the plug(B).Press out the main jet (A) with asuitable punch.Remove the plug (B).Carefully drill a small h

233Fuel systemAssembling the carburettor• Blow all channels in the carburettorcompartment clean• Mount a new plug.Use a suitable punch to get acom

243531 03 06-23Fuel systemCheck that the carburettor is sealed.No leakage is permitted at 50 kPa.Connect pressure tester 531 03 06-23to the fuel intak

253TFuel systemThe needles must be correctly adjusted in order for the engine to give maximumpower at different speeds, run steadily while idling and

263502 71 14-01501 60 02-03Fuel systemCorrectly adjusted carburettorA correctly adjusted carburettor means that the engineaccelerates without hesitati

27531 00 48-63531 03 03-98502 50 18-013Carburettor needles with Zama “caps”.Carburettor adjustment 345RX/FXAdjusting the L-needle1. Mount the Trimmy F

283GFuel systemRemove the bolt (A) and remove thethrottle from the handle.Remove bolts (B) and (C).Separate the halves of the throttle.Remove the bolt

2502 51 03-01General recommendations!!!!!!Remember:Never start the engine without the clutch and clutch drummounted.Do not grasp hot elements such as

293Disassemble the throttle control (A), thelock to prevent accidental throttleoperation (B), the start throttle lock (C)and the throttle stop (D) in

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3144.ContentsDismantling ________________________________ 30Assembly _________________________________ 32Clutch drum _______________________________ 3

324502 21 58-01Centrifugal clutchThe centrifugal clutch has the task of transferring thepower from the engine to the cutting equipment’s driveaxle. As

334502 54 15-01Centrifugal clutchDismantle the clutch from the crank-shaft.Replace the spark plug with piston stopno. 502 54 15-01.Move the engine bod

344502 52 16-02502 11 46-03Centrifugal clutchAssemblyTemporarily place the clutch shoes onthe driving disc and loosely tighten thebolts.Pry out the sh

354505 38 17-09Centrifugal clutchChange the bearings in the clutchhousing if necessary.Change the bearings in the clutchhousing if necessary.Remove th

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3755.ContentsDismantling ________________________________ 36Assembly _________________________________ 37Shaft _____________________________________ 3

385Angle gearDismantlingRemove the cutting equipment andguard.Then loosen the bolts holding the anglegear against the shaft.Remove the angle gear from

311.ContentsDismantling _________________________________ 4Assembly __________________________________ 5Replacing the drive dogs _____________________

395502 50 65-01503 97 64-01Angle gearRemove the lubricant top-up plug.Warm the gearbox and knock it againsta wooden block so that the input axlefalls

405503 80 17-01Angle gearShaftThe shaft contains a drive axle guidethat is easily replaced. It can bedismantled once the plastic sleeve (B)has been re

4166.ContentsDismantling ________________________________ 42Decompression valve ________________________ 43Inlet manifold ____________________________

426502 50 18-01ACylinder and pistonThe cylinder and the piston are two of the compo-nents exposed to most strain in the engine. They mustwithstand, fo

43531 03 06-23502 52 42-016Dismantle the piston.Push the gudgeon pin from the pistonusing punch 502 52 42-01.If the pin is too tight, carefully warm t

446Cleaning, inspectionAfter dismantling, clean the individual components:1. Scrape carbon deposits from the top of the piston.2. Scrape carbon deposi

456502 50 70-01Cylinder and pistonUse a new gasket and fit the cylinder.Make sure that the inlet manifold iscorrectly connected to the sleevecoupling

466Cylinder and pistonAction:Change to a fuel with the correct oilmixture.Change to a higher octane petrol.Replace damaged parts.Replace leaking gaske

476Cylinder and pistonExhaust side damaged by a broken pistonring. The piston ring parts damage the topsection and cause score marks.Piston damage cau

486Cylinder and pistonSmall score marks and a matt, grey surfaceon the piston’s inlet side caused by finedust particles.Cause:• Faulty air filter. Sma

41502 50 18-01StarterWARNING!Protective glasses should be worn when working on the starter to avoid injury to the eyes if, forsome reason, the return

496Cylinder and pistonCause:• Air filter damaged or missing.• Parts from the carburettor or intakesystem have come loose andentered the engine.Action:

506Cylinder and pistonWear tolerancesWhen the surface coating isworn and aluminium appears.Max. 1.0 mm with the pistonring inserted in the lower parto

5177.ContentsDismantling ________________________________ 52Inspecting the crankshaft _____________________ 54Assembly _______________________________

527502 50 18-01Crankshaft and crankcaseThe crankshaft is journalled in the crankcase onheavy-duty ball bearings. In addition to the journallingpoint f

537502 52 39-01505 38 17-09Crankshaft and crankcaseSeparate the crankcase halves. Fit tool 502 52 39-01 to the clutch sideof the crankcase as illustra

547Check the crank bearing. Check the crank bearing. The connect-ing rod shall not have any radial play(up and down).It should, however, have axial pl

557502 50 30-19502 50 30-19Crankshaft and crankcaseCheck that the there is no play in thefill-out plates around the crank disks(applies to models FX/F

567505 38 17-09502 54 11-02 503 84 40-01Crankshaft and crankcaseLeakage testing thecrankcaseFit the two sealing plates (A) and thepressure test nipple

577531 03 06-23 503 55 22-01Crankshaft and crankcaseFit plug 503 55 22-01 instead of thedecompression valve.Connect meter 531 03 06-23 and checkfor le

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51!StarterAssemblyClean requisite parts and assemble inthe reverse order as set out for disman-tling.AssemblyClean all components before assembly:Chan

598.ToolsContentsStarter __________________________________ 60Electrical system__________________________ 60Fuel system _____________________________

60531 00 48-63531 03 03-98502 51 91-01502 71 13-01502 51 34-020.3502 50 06-01502 54 15-01502 51 94-01531 00 60-76502 50 83-01501 60 02-03502 21 58-015

61502 52 39-01505 38 17-09502 50 30-19502 54 11-02503 84 40-01503 55 22-01502 51 03-01502 71 14-01502 50 65-01503 97 64-01503 80 17-01502 52 42-01531

2003W24114 01 98-26

61StarterReplacing the drivedogsSee chapter 2 Ignition system.Replacing the drivedogsSee chapter 2 Ignition system.Tighten the return spring.Check the

72.2Electrical systemContentsChecking the ignition spark ____________________ 8Replacing the spark plug cover ________________ 10Dismantling _________

82502 71 13-01502 51 91-01Electrical systemThe engine is equipped with an electronic ignition system completely without moving parts. Conse-quently, a