Husqvarna 345 Workshop Manual

350 351 353 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 ...

Safety regulations ................................................. 3 General instructions ........................................... 3 Special instructions ............................................ 3 Special tools .......................................................... 4 Technical data ....................................................... 6 Construction and function ................................... 8 Carburettor ......................................................... 8 Troubleshooting ........ ...

This workshop manual can be used in two different ways. • 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 needs to be repaired: 1. Look up the page referring to the relevant sub- assembly. 2. Follow the instructions under the headings: Removal/Dismantling Cleaning and inspection Refitting/Reassembly Dismantling and reassembling the entire chainsaw If the entire chainsaw is to be dismantled, follow the instructions under the heading “Removal/ Dismantling”. Work through the manual and ...

on how to troubleshoot, repair and test a chainsaw. This section also describes the various safety precautions that should be taken when carrying out repairs. The workshop manual has been written for person- nel who are assumed to have general experience of repairing and servicing chainsaws. Workshops where chainsaws are repaired must be equipped with safety equipment that meets local regulations. No-one should carry out repairs on a chainsaw until they have read and understood the contents of this workshop manual. Chainsaws are type-approved to meet the relevant safety leg ...

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2 Piston stop Locking crankshaft 502 54 15-01 3 Stop plate Locating intake gaiter 502 54 17-01 4 Fuel filter hook Withdrawing the fuel filter 502 50 83-01 5 Allen key For M5 bolts 502 50 18-01 6 Puller Frame bearing 504 90 90-02 7 Removal tool Remove seal from clutch side 502 50 55-01 8 Mandrel, sealing ring Removing crankshaft 502 54 21-01 9 Cover plate Sealing during pressure testing 502 54 11-02 10 Pressure tester Connection to cylinder 503 84 40-02 11 Feeler gauge Adjusting ignition module 502 51 34-02 12 Clamp stand Clamping the saw 502 51 02-01 13 Pressure ...

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 / 3,4 / 9 600 350: 49,4 / 3,01 44 / 1,73" 32 / 1,28" 2,3 / 3,1 / 9 000 350 EPA: 51,7 / 3,15 45 / 1,77" 32 / 1,28" 2,3 / 3,1 / 9 000 351/G: 49,4 / 3,01 44 / 1,73" 32 / 1,28" 2,3 / 3,1 / 9 000 353/G: 51,7 / 3,15 45 / 1,77" 32 / 1,28" 2,4 / 3,3 / 9 000 Spark plug gap Ignition system Air gap Carburettor type mm/inches mm/inches 340: 0,5 / 0,02" SEM CD 0,3 / 0,012" Walbro HDA 195 345: ...

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 RCJ 7Y 350 EPA: 2 700 3 800 13 000 NGK BPMR 7A, Champion RCJ 7Y 351/G: 2 700 3 800 13 000 NGK BPMR 7A, Champion RCJ 7Y 353/G: 2 700 3 800 13 000 NGK BPMR 7A, Champion RCJ 7Y Fuel tank capacity Oil pump capacity at Oil tank capacity Automatic oil pump Litres/US pints 8,500 rpm, Litres/US pints ml/min 340: 0,5 / 1,05 9 0,25 / 0,53 Yes 345: 0,5 / 1,05 9 0,25 / ...

on the setting: • Cold start mode • Idling mode • Part throttle mode • Full throttle mode In the cold start mode the choke valve (D) is completely closed. This increases the vacuum in the carburettor so that fuel is sucked through the diffuser jets faster (E). In idling mode the throttle valve (F) is closed. Air is sucked through an aperture in the throttle valve and a small amount of fuel is supplied through the diffuser jet (E). Construction and function Carburettor The carburettor consists of three sub-systems: • The metering unit (A) which contains the jets and the fuel control m ...

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). For Husqvarna Parts Call 606-678-9623 or 606-561-4983 ...

Leaking control diaphragm/ cover plate Needle valve assembly sticking Worn needle valve lever Faulty diffuser jet Fuel filter blocked Fuel line blocked Leaking air intake hose (rubber) Loose carburettor mounting bolts Worn throttle valve pivot Loose throttle valve screw Worn throttle valve Needle valve assembly sticking Leak in metering system (air or fuel) Metering system centre knob is worn Hole in diaphragm Leaking control diaphragm/ cover plate Crankcase leaking Fuel line blocked Needle valve set too high Needle valve assembly sticking Leak in metering system (air or fuel) Leaking control diaphragm/ cove ...

Does not accelerate Engine stalls when throttle released Over rich acceleration Adjust L screw Adjust H screw Blocked air filter Blocked fuel tank vent Blocked fuel filter Fuel line blocked Loose or damaged fuel hose Impulse channel blocked Loose cover on carburettor pump side Faulty pump diaphragm Leaking air intake hose (rubber) Loose carburettor mounting bolts Needle valve set too low Metering system incorrectly assembled Needle valve assembly sticking Faulty diffuser jets Blocked silencer Adjust L screw Adjust H screw Faulty pump diaphragm Needle valve set too high Needle valve assembly sticki ...

out and cause injury. Wear eye protection. Repair instructions Chain brake – dismantling 1 Disengage the brake by pushing the kickback guard backwards. Unscrew the guide bar bolts and remove the clutch cover, chain and guide bar. 2 Grip the clutch cover carefully in a vice. Release the brake spring by using the kickback guard from the saw as a tool. Engage it with the brake mecha- nism and turn anticlockwise to activate the brake. Remove the screws and carefully remove the cover from the chain brake spring. 4 Place one hand over the spring and insert a small screwdriver between the bottom end of ...

brake 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 above the surface is given in the table above. • Let go of the front handle and let the chainsaw fall towards the surface. • When the guide bar hits the surface the chain brake must engage. Chain brake – reassembly 1 Bolt the elbow joint to the brake band and tighten to a torque of 1–1.5 Nm. Locate the elbow joint and connected brake band in their recesses ...

has cooled down, otherwise you may burn yourself. Repair instructions Remove the chain catcher and replace it with a new one. Check that the vibration damping spring locates correctly against the crankcase when you bolt the new chain catcher in position. 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). 3 Turn the chain tensioner anticlockwise as far as it will go. Refit: • guide bar • chain • clutch cover Silencer – removal Remove the cylinder cover, silencer support, silencer, gasket and cooling plate. 2 ...

1 Remove the cylinder cover and air filter. 2 Disconnect both leads from the stop plate and stop switch. Remove the stop plate by carefully sliding it over the lug on the front mounting. 3 Carefully prise the carburettor assembly off the left- hand rubber mounting using a small screwdriver. 4 Carefully prise the stop switch’s upper mounting off the air filter holder while lifting the switch to release it from the lower mounting. Measure the resistance by connecting a multimeter to the ignition coil. NOTE! The switch must be in the “on” position to give the correct reading. The resistance must ...

1 Remove the cylinder cover, air filter and stop switch. 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 over the air filter holder. 2 Refit the stop plate. Engage the stop plate in the front slot first then lift the rear edge onto the stop switch. Slide the stop plate in as far as it will go. 3 Refit: • the leads to the stop plate and stop switch • air filter • cylinder Disconnect the pushrod from the carburettor by first carefully prising up the spring over the end o ...

• Clean and inspect all parts carefully. If there are any cracks or other defects replace the damaged parts with new ones. Always use original parts. • Lubricate the throttle lock with oil. • Check that the spring is not broken and has not lost its tension. Throttle lock, throttle trigger and return spring – refitting 1 Throttle lock, throttle trigger and return spring – removal 1 Remove the throttle lock by pressing it to the left (A) and carefully levering it up with a screwdriver on the clutch side (B) of the saw to disengage the lugs on either side of the throttle lock from the fuel t ...

351G, 353G – removal No heating or heating only in front hand grip • Front hand grip – troubleshooting 1 Remove the three bolts that secure the cover over the front hand grip. Disconnect the leads from the switch and generator and measure the resistance of the hand grip heater, which should be 3–4 ohm. Replace the front hand grip if the resistance is higher. 2 Reconnect the leads and refit the cover. 3 Push the switch back into place and reconnect the leads. 4 Bolt the cover back onto the hand grip. • Generator – troubleshooting 1 Remove the cylinder cover and cover from the front hand grip. Dis ...

rear hand grip. Remove the throttle lock and throttle handle, see “Throttle trigger”. Pull out the heater element with the leads still connected. Troubleshooting carburettor heater (346XPG, 351G, 353G) Operation The carburettor temperature is controlled by an electronic thermostat to eliminate the risk of ice formation in the carburettor. The thermostat switches on/off at 12°C/54F. This means that the saw operator does not need to remember to switch the carburettor heater on or off. • Troubleshooting Front handle heater Remove the side cover from the handle. Discon- nect the leads at F ...