Workshop manualEnglish340 345 346XP350 351 353
English – 9Construction and functionIn part throttle mode the throttle valve (F) is par-tially open. Fuel is supplied through the diffuser jets(E).In
10 – EnglishTroubleshootingWorn needle valveLeaking control diaphragm/cover plateNeedle valve assembly stickingWorn needle valve leverFaulty diffuser
English – 11TroubleshootingAcceleration and retardationDoes notaccelerateEngine stallswhen throttlereleasedOver richaccelerationAdjust L screwAdjust H
12 – English3WARNING!Make sure the spring does not flyout and cause injury. Wear eyeprotection.Repair instructionsChain brake – dismantling1Disengage
English – 13Repair instructionsNOTE!After completing the repair the chainbrake must be tested as described below.Operating test:The engine must not be
14 – EnglishWARNING!Do not touch the silencer until ithas cooled down, otherwise youmay burn yourself.Repair instructionsRemove the chain catcher and
English – 15Repair instructionsStop switch – removal1Remove the cylinder cover and air filter.2Disconnect both leads from the stop plate and stopswitc
16 – EnglishRepair instructionsChoke control – removal1Remove the cylinder cover, air filter and stopswitch. Disconnect the fuel hose from the carbure
English – 17Repair instructionsCleaning and inspection• Clean and inspect all parts carefully. If there areany cracks or other defects replace the dam
18 – EnglishHand grip heater on model 346XPG,351G, 353G – removalNo heating or heating only in front hand grip• Front hand grip – troubleshooting1Rem
English – 1Workshop manualHusqvarna 340/345/346XP/350/351/353ContentsIntroduction ... 2Safety
English – 19Unscrew the two bolts from the right side of therear hand grip. Remove the throttle lock andthrottle handle, see “Throttle trigger”. Pull
20 – EnglishRepair instructionsHeater element and rear hand grip –removal1Remove the cylinder cover, hand grip cover, handgrip and right-hand stop.The
English – 21Repair instructionsWARNING!If the recoil spring is still undertension when the pulley is re-moved it can fly out and cause in-jury. Wear e
22 – EnglishRepair instructionsWARNING!Make sure the recoil spring doesnot fly out and cause injury. Weareye protection.Replacing a worn recoil spring
English – 23Repair instructionsIgnition module – testingIf there is a fault in the ignition system the ignitionmodule must be tested before the igniti
24 – EnglishRepair instructionsGenerator – refitting1Feed the generator lead through the holes in thecrankcase and hand grip. Bolt the generator inpos
English – 25Repair instructions3Then refit:• cable guide and press the leads into position• HT lead• starter assembly, tighten to a torque of 2.5–3.5N
26 – EnglishRepair instructionsCentrifugal clutch – removal1Remove the cylinder cover. Disengage the chainbrake by pushing the kickback guard backward
English – 27Repair instructionsFit the clutch onto the crankshaft and tightenanticlockwise as far as it will go. Then tighten to atorque of at least 2
28 – EnglishRepair instructionsCleaning and inspection• Clean and inspect all parts carefully. If there areany cracks or other defects replace the dam
2 – EnglishArrangement of the manualThis workshop manual can be used in two differentways.• To repair a specific sub-assembly on a chainsaw.• To disma
English – 29Repair instructionsFit the chain guard plate, tightening the bolts to atorque of 2–3 Nm.Model 350:Fit the bolts on the anti-vibration elem
30 – EnglishRepair instructionsRecommended setting:13–15" bar Min. setting15–18" bar Midway setting18–20" bar Max. settingAdjustable oi
English – 31Repair instructionsWhen replacing the thermostat: Disconnect thecable from X and V. Trouble shooting, see page20.On saws with carburettor
32 – EnglishRepair instructionsFit the needle valve with lever arm, spindle andspring and tighten the screw.Use a rule to check that the lever arm is
English – 33Repair instructionsCarburettor – pressure testingPressure testing should be carried out with thecarburettor fully assembled. Testing shoul
34 – EnglishRepair instructionsPush the rear carburettor mounting into its rubberbushing using a small screwdriver. Remove stopplate 502 54 17-01.45Co
English – 35Repair instructionsUnbolt the vibration damping spring between thecylinder and hand grip.3Unscrew the four cylinder bolts. Lift up the cyl
36 – EnglishRefit the carburettor. Screw in the carburettor boltsdirectly from behind without lifting the carburettorassembly, tightening to a torque
English – 37Repair instructionsCarburettor – adjustmentFor instructions on adjusting the EPA carburettorsee appendix A.Adjusting the carburettor invol
38 – English1Empty the fuel tank.2Remove the following:• cylinder cover• air filter• clutch cover• chain and guide bar• starter assembly• cable guide3
English – 3General instructionsThis workshop manual gives detailed instructionson how to troubleshoot, repair and test a chainsaw.This section also de
English – 395Unscrew both stops and the three vibration damp-ing springs from the flywheel side and clutch sideof the engine.6Disconnect and remove th
40 – EnglishConnect the fuel hose to the carburettor. Checkthat the hose is not kinked or too long to beclamped between the crankcase and tank. Thecor
English – 41Repair instructionsUndo the four cylinder bolts and lift the cylinder offcarefully.Models 340, 345Piston and cylinder – removal1Remove:• c
42 – English• Measure piston ring wear. This should notexceed 1 mm. Use the piston to push down thepiston ring.• The needle roller bearing is undamage
English – 43Repair instructionsPiston and cylinder – refitting 346XP,350, 351, 3531Fit the piston with the arrow pointing towards theexhaust port. Pus
44 – EnglishNOTE!If a new piston or cylinder has been fittedthe saw must be run for the first 3–4hours with carburettor adjusted to thefactory setting
English – 45Repair instructionsCrankcase and crankshaft –dismantling 346XP, 351, 3531Remove the following:• guide bar and chain• clutch cover• cylind
46 – EnglishCrankshaft bearings – replacement346XP, 351, 353If the crankshaft bearings are to be replaced, tapthem out gently using drift 502 70 84-01
English – 47Repair instructionsCleaning and inspectionClean and inspect all parts carefully.Sealing ring – replacementRemove the sealing ring from the
48 – English4Fit and tighten the six crankcase bolts to a torqueof 8–10 Nm. Check that the crankshaft rotatesfreely.5Refit the following parts:• bark
4 – EnglishSpecial tools4581112101231469713
English – 49Repair instructionsRepairing damaged threadsA repair kit, 503 27 33-01, is available for repairingdamaged threads.First drill out the hole
50 – EnglishAppendix ARepair instructionsBasic adjustment for EPA II carburetorsAfter replacing the carburetor or high speed and/or lowspeed needle on
English – 512003W12114 01 47-26
English – 5Item Description Used for Order no.1 Clutch tool Centrifugal clutch 502 54 16-012 Piston stop Locking crankshaft 502 54 15-013 Stop plate L
6 – EnglishDisplacement Cylinder bore Stroke Max power/speedcm3/cubic inches Ø mm/Ø inches mm/inches kW/hp/rpm340: 40,8 / 2,44 40 / 1,57" 32 / 1
English – 7Technical dataIdling speed Engagement speed Max. speed Spark plugrpm rpm rpm340: 2 700 3 800 12 500 NGK BPMR 7A, Champion RCJ 7Y345: 2 700
8 – EnglishThe carburettor works in different ways dependingon the setting:• Cold start mode• Idling mode• Part throttle mode• Full throttle modeIn th
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