Page 2 - Workshop manual
English – 1 Workshop manual Husqvarna 340/345/346XP/350/351/353 Contents Introduction ........................................................... 2 Safety regulations ................................................. 3 General instructions ........................................... 3Special instruc...
Page 3 - Arrangement of the manual; Repairing a specific sub-assembly; Construction and function; Introduction; Troubleshooting
2 – English Arrangement of the manual This workshop manual can be used in two differentways. • To repair a specific sub-assembly on a chainsaw. • To dismantle and reassemble a complete chainsaw. Repairing a specific sub-assembly If a specific sub-assembly on the chainsaw needsto be repaired: 1. Look...
Page 4 - General instructions; Safety regulations
English – 3 General instructions This workshop manual gives detailed instructionson how to troubleshoot, repair and test a chainsaw.This section also describes the various safetyprecautions that should be taken when carrying outrepairs. The workshop manual has been written for person-nel who are ass...
Page 5 - Special tools
4 – English Special tools 4 5 8 11 12 10 1 2 3 14 6 9 7 13
Page 7 - Technical data
6 – English Displacement Cylinder bore Stroke Max power/speed cm 3 /cubic inches Ø mm/Ø inches mm/inches kW/hp/rpm 340: 40,8 / 2,44 40 / 1,57" 32 / 1,28" 2,0 / 2,7 / 9 000 345: 45,0 / 2,75 42 / 1,65" 32 / 1,28" 2,2 / 3,0 / 9 000 346XP/G: 45,0 / 2,75 42 / 1,65" 32 / 1,28" 2,5 ...
Page 8 - rpm
English – 7 Technical data Idling speed Engagement speed Max. speed Spark plug rpm rpm rpm 340: 2 700 3 800 12 500 NGK BPMR 7A, Champion RCJ 7Y 345: 2 700 3 800 12 500 NGK BPMR 7A, Champion RCJ 7Y 346XP/G: 2 700 3 800 14 200 NGK BPMR 7A, Champion RCJ 7Y 350: 2 700 3 800 13 000 NGK BPMR 7A, Champion ...
Page 9 - Carburettor; metering unit
8 – English The carburettor works in different ways dependingon the setting: • Cold start mode • Idling mode • Part throttle mode • Full throttle mode In the cold start mode the choke valve (D) iscompletely closed. This increases the vacuum inthe carburettor so that fuel is sucked through thediffuse...
Page 11 - Starting
10 – English Troubleshooting Worn needle valveLeaking control diaphragm/cover plateNeedle valve assembly stickingWorn needle valve leverFaulty diffuser jet Fuel filter blockedFuel line blockedLeaking air intake hose (rubber)Loose carburettor mountingboltsWorn throttle valve pivotLoose throttle valve...
Page 12 - Acceleration and retardation; Troubleshooting methods; High rpm
English – 11 Troubleshooting Acceleration and retardation Does notaccelerate Engine stallswhen throttlereleased Over richacceleration Adjust L screwAdjust H screwBlocked air filterBlocked fuel tank ventBlocked fuel filterFuel line blockedLoose or damaged fuel hoseImpulse channel blockedLoose cover o...
Page 13 - Repair instructions; Chain brake – dismantling
12 – English 3 WARNING!Make sure the spring does not flyout and cause injury. Wear eyeprotection. Repair instructions Chain brake – dismantling 1 Disengage the brake by pushing the kickbackguard backwards. Unscrew the guide bar bolts andremove the clutch cover, chain and guide bar. 2 Grip the clutch...
Page 14 - Chain brake – reassembly
English – 13 Repair instructions NOTE! After completing the repair the chainbrake must be tested as described below. Operating test: The engine must not be running during the test. Guide bar length Height 38cm/15" 50 cm/20" • Hold the chainsaw over a firm surface. The height of the guide bar...
Page 15 - Silencer – removal
14 – English WARNING!Do not touch the silencer until ithas cooled down, otherwise youmay burn yourself. Repair instructions Remove the chain catcher and replace it with anew one. Check that the vibration damping springlocates correctly against the crankcase when youbolt the new chain catcher in posi...
Page 16 - Stop switch – removal; Stop switch – resistance measurement
English – 15 Repair instructions Stop switch – removal 1 Remove the cylinder cover and air filter. 2 Disconnect both leads from the stop plate and stopswitch. Remove the stop plate by carefully sliding itover the lug on the front mounting. 3 Carefully prise the carburettor assembly off the left-hand...
Page 17 - Choke control – removal
16 – English Repair instructions Choke control – removal 1 Remove the cylinder cover, air filter and stopswitch. Disconnect the fuel hose from the carburet-tor. Stop switch – refitting 1 Carefully press the new stop switch into place.Check that the switch’s upper mounting clips overthe air filter ho...
Page 18 - Cleaning and inspection
English – 17 Repair instructions Cleaning and inspection • Clean and inspect all parts carefully. If there are any cracks or other defects replace the damagedparts with new ones. Always use original parts. • Lubricate the throttle lock with oil. • Check that the spring is not broken and has notlost ...
Page 20 - Operation; Rear handle heater
English – 19 Unscrew the two bolts from the right side of therear hand grip. Remove the throttle lock andthrottle handle, see “Throttle trigger”. Pull out theheater element with the leads still connected. Troubleshooting carburettor heater(346XPG, 351G, 353G) Operation The carburettor temperature is...
Page 22 - Starter assembly – removal; Replacing a broken or worn starter cord
English – 21 Repair instructions WARNING!If the recoil spring is still undertension when the pulley is re-moved it can fly out and cause in-jury. Wear eye protection. Starter assembly – removal 1 Undo the four bolts that fasten the starter assemblyto the crankcase and lift off the starter assembly. ...
Page 23 - Replacing a worn recoil spring; Starter assembly – refitting
22 – English Repair instructions WARNING!Make sure the recoil spring doesnot fly out and cause injury. Weareye protection. Replacing a worn recoil spring 1 Remove the bolt from the centre of the pulley andlift off the pulley and spring. 2 Remove the broken recoil spring. 3 Fit the bolt through the c...
Page 24 - Ignition module – testing
English – 23 Repair instructions Ignition module – testing If there is a fault in the ignition system the ignitionmodule must be tested before the ignition systemis removed. Test the ignition module as follows: • Connect a test spark plug 502 71 13-01 to the ignition lead and clip the test spark plu...
Page 25 - Generator – refitting
24 – English Repair instructions Generator – refitting 1 Feed the generator lead through the holes in thecrankcase and hand grip. Bolt the generator inposition, tightening the bolts to a torque of 5 Nm.Clip the lead to the tank.NOTE! The lead connector must be positioned onthe right of the clip, see...
Page 26 - Ignition module and flywheel – refitting
English – 25 Repair instructions 3 Then refit: • cable guide and press the leads into position • HT lead • starter assembly, tighten to a torque of 2.5–3.5 Nm • cylinder cover Ignition module and flywheel – refitting 1 Place the flywheel on the crankshaft. Turn theflywheel so that the key lines up w...
Page 27 - Centrifugal clutch – removal; Centrifugal clutch – refitting
26 – English Repair instructions Centrifugal clutch – removal 1 Remove the cylinder cover. Disengage the chainbrake by pushing the kickback guard backwards.Undo the guide bar bolts and remove the clutchcover, chain and guide bar. 2 Unbolt the clutch using tool 502 54 16-01 and asuitable socket or co...
Page 31 - Carburettor – removal
30 – English Repair instructions Recommended setting: 13–15" bar Min. setting15–18" bar Midway setting18–20" bar Max. setting Adjustable oil pump – adjustment346XP, 350, 351, 353 Use a screwdriver or adjustable spanner to turn theadjuster screw on the pump. Turning the screwclockwise dec...
Page 32 - Carburettor – dismantling
English – 31 Repair instructions When replacing the thermostat: Disconnect thecable from X and V. Trouble shooting, see page20. On saws with carburettor 346XPG, 351G, 353G Replacing the heating element: Lower the rearsection of the tank by removing the bolt betweenthe hand grip cover and vibration d...
Page 34 - Carburettor – pressure testing
English – 33 Repair instructions Carburettor – pressure testing Pressure testing should be carried out with thecarburettor fully assembled. Testing should alwaysbe carried out after the carburettor has beenrepaired, but can also be performed for trouble-shooting before dismantling. Carry out the tes...
Page 36 - Air intake system – removal
English – 35 Repair instructions Unbolt the vibration damping spring between thecylinder and hand grip. 3 Unscrew the four cylinder bolts. Lift up the cylinderso that the intake system insulating plate is free ofthe crankcase. 4 On models 340 and 345 there are cylinder bolts onthe underside. 5 Air i...
Page 37 - Air intake system – refitting
36 – English Refit the carburettor. Screw in the carburettor boltsdirectly from behind without lifting the carburettorassembly, tightening to a torque of 1–1.5 Nm. It isimportant to hold the carburettor flange securelywhen tightening the bolts to prevent the inletmanifold from moving. 4 4 Push down ...
Page 38 - Carburettor – adjustment; Basic settings and running in
English – 37 Repair instructions Carburettor – adjustment For instructions on adjusting the EPA carburettorsee appendix A. Adjusting the carburettor involves adjusting theengine to the local conditions e.g. climate, alti-tude, fuel and type of two-stroke oil. The carburettor is equipped with three a...
Page 39 - Fuel tank – removal; Fine adjustment of idling speed T
38 – English 1 Empty the fuel tank. 2 Remove the following: • cylinder cover • air filter • clutch cover • chain and guide bar • starter assembly • cable guide 3 Disconnect the fuel hose from the carburettor. 4 Fuel tank – removal WARNING!The fuel used in chainsaws isharmful if inhaled, may causeski...
Page 41 - Tank vent – testing
40 – English Connect the fuel hose to the carburettor. Checkthat the hose is not kinked or too long to beclamped between the crankcase and tank. Thecorrect hose length between the tank and crank-case is 43 mm (1.69 inches). The correct hoselength between the crankcase and carburettor is53 mm (2.09 i...
Page 42 - Piston and cylinder – removal; If replacing the cylinder:
English – 41 Repair instructions Undo the four cylinder bolts and lift the cylinder offcarefully. Models 340, 345 Piston and cylinder – removal 1 Remove: • cylinder cover • carburettor (see “Carburettor – removal”) • silencer • spark plug • fuel tank (applies to 340, 345) 2 Unbolt the vibration damp...
Page 45 - Cylinder – pressure testing
44 – English NOTE! If a new piston or cylinder has been fittedthe saw must be run for the first 3–4hours with carburettor adjusted to thefactory settings. Piston and cylinder – refitting 340, 345 1-5 See Piston and cylinder 346XP, 350, 351, 353 –Refitting points 1-5. 6 Apply silicone adhesive/sealin...
Page 46 - without
English – 45 Repair instructions Crankcase and crankshaft –dismantling 346XP, 351, 353 1 Remove the following: • guide bar and chain • clutch cover • cylinder cover • starter assembly* • ignition system* • generator* • centrifugal clutch* • oil pump* • bark rest • chain tensioner • throttle pushrod ...
Page 48 - Sealing ring – replacement
English – 47 Repair instructions Cleaning and inspection Clean and inspect all parts carefully. Sealing ring – replacement Remove the sealing ring from the crankcase usinga small screwdriver. NOTE! Take care to avoid damaging the crank-case. To fit the sealing ring use the sleeve that is sup-plied w...
Page 50 - Repairing damaged threads; Thread insert; Guide bar bolts – replacement
English – 49 Repair instructions Repairing damaged threads A repair kit, 503 27 33-01, is available for repairingdamaged threads. First drill out the hole using: 6.1 mm drill bit for magnesium crankcase Then screw in the thread insert using a suitablebolt and spanner. Thread insert A damaged thread ...
Page 51 - Appendix A; Basic adjustment for EPA II carburetors; new
50 – English Appendix A Repair instructions Basic adjustment for EPA II carburetors After replacing the carburetor or high speed and/or lowspeed needle on an EPA (The US EnvironmentalProtection Agency) certified product a basic adjustmentmust be carried out as described below in order to meetthe EPA...
