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For Husqvarna Parts Call 606-678-9623 or 606-561-4983
Workshop manual
340 345 346XP
350 351 353
English
www.mymowerparts.com

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Troubleshooting

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   Summary of Contents for Husqvarna 345

  • Page 1

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Workshop manual 340 345 346XP 350 351 353 English www.mymowerparts.com...

  • Page 2: Table Of Contents

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Workshop manual Husqvarna 340/345/346XP/350/351/353 Contents Introduction ............2 Safety regulations ..........3 General instructions ........... 3 Special instructions ..........3 Special tools ............4 Technical data ............6 Construction and function ........8 Carburettor ............

  • Page 3: Introduction

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Introduction Arrangement of the manual Troubleshooting This workshop manual can be used in two different These pages describe the most common faults that ways. affect a chainsaw. They are divided into four different groups with the most likely faults de- •...

  • Page 4: Safety Regulations

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Safety regulations General instructions Special instructions This workshop manual gives detailed instructions The fuel that is used in a chainsaw poses the on how to troubleshoot, repair and test a chainsaw. following hazards:...

  • Page 5: Special Tools

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Special tools – English www.mymowerparts.com...

  • Page 6

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Special tools 20 b 20 c Item Description Used for Order no. Clutch tool Centrifugal clutch 502 54 16-01 Piston stop Locking crankshaft 502 54 15-01 Stop plate Locating intake gaiter 502 54 17-01...

  • Page 7: Technical Data

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Technical data Displacement Cylinder bore Stroke Max power/speed /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"...

  • Page 8

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Technical data Idling speed Engagement speed Max. speed Spark plug 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...

  • Page 9: Construction And Function

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Construction and function Carburettor The carburettor works in different ways depending on the setting: The carburettor consists of three sub-systems: • Cold start mode • Idling mode • Part throttle mode • Full throttle mode •...

  • Page 10

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Construction and function In part throttle mode the throttle valve (F) is par- tially open. Fuel is supplied through the diffuser jets (E). In full throttle mode both valves are open and fuel is supplied through all the diffuser jets (E).

  • Page 11: Troubleshooting

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Troubleshooting The various faults that can affect a chainsaw are divided into four groups. In each group the likely symp- toms are given on the left and possible causes are listed on the right. The most likely faults are given first, and so on.

  • Page 12: Troubleshooting Methods

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Troubleshooting High rpm Acceleration and retardation Will not run at Adjust H screw Does not Adjust L screw full throttle Blocked air filter accelerate Adjust H screw Blocked fuel tank vent Blocked air filter...

  • Page 13: Repair Instructions

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Chain brake – dismantling WARNING! Make sure the spring does not fly out and cause injury. Wear eye protection. Disengage the brake by pushing the kickback Remove the screws and carefully remove the cover guard backwards.

  • Page 14: Chain Brake Reassembly

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Chain brake – reassembly Bolt the elbow joint to the brake band and tighten to a torque of 1–1.5 Nm. Tension the brake spring by using the kickback Locate the elbow joint and connected brake band guard from the saw as a tool.

  • Page 15: Silencer

    A worn (damaged) chain catcher on 340, 345 or 350 can be replaced with the same chain catcher as 346XP, 351 and 353 (see figure above).

  • Page 16: Stop Switch

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Stop switch – removal Cleaning and inspection Clean and inspect all parts carefully. If there are Remove the cylinder cover and air filter. any cracks or other defects replace the damaged parts with new ones.

  • Page 17: Choke Control

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Stop switch – refitting Choke control – removal Remove the cylinder cover, air filter and stop switch. Disconnect the fuel hose from the carburet- tor. NOTE! Do not use knurled pliers to disconnect or reconnect the fuel hose.

  • Page 18: Throttle Trigger

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Choke control – refitting Cleaning and inspection First reattach the choke control to the air filter, then • Clean and inspect all parts carefully. If there are press it onto the carburettor so that the clips engage.

  • Page 19: Hand Grip Heater

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Hand grip heater on model 346XPG, Reconnect the lead and refit the hand grip cover 351G, 353G – removal and cylinder cover. No heating or heating only in front hand grip •...

  • Page 20

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Rear handle heater Measure the resistance between F and Z. It should be 1 ± 0.5 ohm. If not, replace the rear handle heater. Generator Measure the resistance between G and H. It should be between 0.3–1.3 ohm.

  • Page 21

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Heater element and rear hand grip – Hand grip heater on model 346XPG, removal 351G, 353G – refitting Remove the cylinder cover, hand grip cover, hand Feed the leads into the rear hand grip and insert grip and right-hand stop.

  • Page 22: Starter Assembly

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Starter assembly – removal Replacing a broken or worn starter cord Before replacing a worn starter cord the tension in the recoil spring must be released. Pull the starter cord out through the notch in the pulley rim and wind the pulley anti-clockwise to release the tension in the spring.

  • Page 23: Recoil Spring

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Replacing a worn recoil spring WARNING! Make sure the recoil spring does not fly out and cause injury. Wear eye protection. Remove the bolt from the centre of the pulley and lift off the pulley and spring.

  • Page 24: Ignition Module - Testing

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Ignition module – testing If there is a fault in the ignition system the ignition module must be tested before the ignition system is removed. If replacing the ignition module, disconnect its leads and unscrew it.

  • Page 25: Generator

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Replacing the generator, model 346XP, Remove the fuel hose and throttle pushrod from 351, 353 the carburettor. Unbolt the rear tank mounting from the crankcase, Remove the cylinder cover. Disconnect the HT lead, i.e.

  • Page 26

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Ignition module and flywheel – refitting Place the flywheel on the crankshaft. Turn the flywheel so that the key lines up with the keyway in Then refit: the shaft. • cable guide and press the leads into position Fit the washer and nut on the shaft and tighten to a torque of 25-30 Nm.

  • Page 27: Centrifugal Clutch

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Centrifugal clutch – removal Inspection and cleaning Remove the cylinder cover. Disengage the chain • Clean and inspect all parts carefully. If there are brake by pushing the kickback guard backwards.

  • Page 28: Oil Pump

    Push the housing up a little from the fuel tank and (clockwise) using clutch tool 502 54 16-01 and a remove the filter (A) from underneath, see the suitable socket spanner or combination spanner. diagram under “Oil pump – removal 340, 345”. English – www.mymowerparts.com...

  • Page 29

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Oil pump –refitting 346XP, 350, 351, 353 Remove the pin (B) from the adjuster screw, using a small drift to press it out. Press in the pump piston (C) so that the adjuster screw (D) can be removed.

  • Page 30

    Lubricate the needle bearing with grease. Fit the Note. pump drive wheel (D), needle bearing (C), chain Models 340 and 345 have another type of chain sprocket (B), if fitted, and clutch drum (A). tensioner, which is adjusted from the side.

  • Page 31: Carburettor

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Adjustable oil pump – adjustment 346XP, 350, 351, 353 Use a screwdriver or adjustable spanner to turn the adjuster screw on the pump. Turning the screw clockwise decreases the oil flow and turning it anti- clockwise increases the oil flow.

  • Page 32

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Carburettor – dismantling On saws with a carburettor heater 346XPG, 351G, 353G Heating element Remove the bracket’s two bolts above the carbu- rettor. Disconnect the cable connections to the carburettor heater and remove the heating ele- ment.

  • Page 33

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Cleaning and inspection If the throttle and choke butterflies and their Clean all the carburettor components in petrol. Use spindles were removed, these must be refitted. an airline to dry off the petrol from all components.

  • Page 34: On Saws With Carburettor Heater

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Carburettor – pressure testing Carburettor – refitting Pressure testing should be carried out with the carburettor fully assembled. Testing should always NOTE! be carried out after the carburettor has been Cleanliness is very important when reas- repaired, but can also be performed for trouble- sembling the carburettor.

  • Page 35: Carburettor Heater

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Connect the leads to the stop switch. Carburettor heater 346XP, 351, 353 – Refitting Fit the carburettor. Screw in the carburettor bolts directly from behind, without lifting the carburettor Heating element assembly.

  • Page 36: Air Intake System

    • carburettor • HT lead • starter assembly (340, 345) • Fuel tank (340, 345) On models 340 and 345 there are cylinder bolts on the underside. Unbolt the vibration damping spring between the cylinder and hand grip. Free the insulating plate from the cylinder by releasing the clamp using pliers.

  • Page 37

    Re- the cylinder’s impulse channel. move tool 502 54 17-01. Refit: • cylinder, see special instructions • silencer support (does not apply to 340, 345, 350) • air filter • HT lead • cylinder cover •...

  • Page 38: Carburettor - Adjustment

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Carburettor – adjustment If it is not possible to check the maximum speed with a tachometer then the H jet should not be set For instructions on adjusting the EPA carburettor to a weaker mixture than the basic factory setting.

  • Page 39: Fuel Tank

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Fine adjustment of idling speed T Fuel tank – removal • The idling speed is adjusted using the screw WARNING! marked T. The fuel used in chainsaws is • If adjustment is necessary, screw in the idling harmful if inhaled, may cause screw T until the chain starts to turn.

  • Page 40: Fuel Filter

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Cleaning and inspection Carefully check that: • there are no leaks from the fuel tank • there are no leaks from the tank filler cap • the fuel hose is undamaged and free from wear •...

  • Page 41

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Tank vent – testing Fit the throttle pushrod in the tank and connect it to the carburettor. Refit the spring. Connect pressure gauge 502 50 38-01 to the fuel hose. Pump the pressure up to 50 kPa (0.5 bar).

  • Page 42: Piston And Cylinder

    • carburettor (see “Carburettor – removal”) • silencer • spark plug • fuel tank (applies to 340, 345) Remove the circlips from the ends of the gudgeon pin and press it out. Then lift off the piston. Unbolt the vibration damping spring from the hand grip.

  • Page 43: Decompression Valve - Pressure Testing

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions When replacing the cylinder 340, 345: Unscrew the decompression valve. (345) Remove the intake system, see “Air intake system – removal”. • Measure piston ring wear. This should not exceed 1 mm. Use the piston to push down the Model 350 is fitted with a spacer, which is secured piston ring.

  • Page 44: Piston And Cylinder Refitting 346xp/350/351/353

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Piston and cylinder – refitting 346XP, 350, 351, 353 Press the insulating plate 503 86 62-01 onto the cylinder. Check that the impulse tube connected to the insulating plate is seated correctly in the inlet manifold and lock the clamp over the manifold.

  • Page 45: Cylinder - Pressure Testing

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Piston and cylinder – refitting 340, 345 Cylinder – pressure testing See Piston and cylinder 346XP, 350, 351, 353 – Refitting points 1-5. Apply silicone adhesive/sealing compound (03- 7062) to the crankcase’s contact surfaces with the cylinder.

  • Page 46: Crankcase And Crankshaft

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Crankcase and crankshaft – dismantling 346XP, 351, 353 Remove the following: • guide bar and chain • clutch cover • cylinder cover • starter assembly* • ignition system* • generator* • centrifugal clutch* •...

  • Page 47: Crankshaft Bearings

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Crankshaft complete - dismantling Crankshaft bearings – replacement 340, 345, 350 346XP, 351, 353 If the crankshaft bearings are to be replaced, tap them out gently using drift 502 70 84-01.

  • Page 48

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Crankcase and crankshaft – Cleaning and inspection reassembly 346XP, 351, 353 Clean and inspect all parts carefully. Sealing ring – replacement Remove the sealing ring from the crankcase using a small screwdriver.

  • Page 49

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Crankshaft complete 340, 345, 350 – reassembly Fit and tighten the six crankcase bolts to a torque of 8–10 Nm. Check that the crankshaft rotates freely. Fit the crankshaft complete in the crankcase.

  • Page 50: Repairing Damaged Threads

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Guide bar bolts – replacement Repairing damaged threads A repair kit, 503 27 33-01, is available for repairing Drain the oil tank. damaged threads. First drill out the hole using: Knock through the old guide bar bolt so that it falls 6.1 mm drill bit for magnesium crankcase...

  • Page 51: Appendix A, Carburettor - Epa Models

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Repair instructions Appendix A 5. Let the engine run at ”B” rpm ~ 1 minute, until warm. Basic adjustment for EPA II carburetors After replacing the carburetor or high speed and/or low 6. Adjust the H-needle to a top speed of ”C” rpm.

  • Page 52

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 114 01 47-26 English – 2003W12 www.mymowerparts.com...

This manual also for:

353, 346xp, 350, 351, 340, 345

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