Husqvarna 340, 345, 346XP,350, 351, 353 Stop switch removal, Stop switch resistance measurement

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Repair instructions

Stop switch – removal

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.

Cleaning and inspection

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.

Stop switch – resistance measurement

Clean the mating surfaces and check the resist- ance as follows:

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 not be higher than 0.2 ohm when the switch is in the on position.

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Contents 340 345 346XP 350 351 Workshop manual Husqvarna 340/345/346XP/350/351/353 Contents Appendix A, Carburettor EPA modelsTroubleshooting IntroductionArrangement of the manual Construction and functionGeneral instructions Safety regulationsSpecial instructions Special tools 20 b 20 c 20 aTechnical data Rpm Construction and function CarburettorConstruction and function Starting TroubleshootingIdling low rpm High rpm Acceleration and retardationRepair instructions Cleaning and inspectionChain brake dismantling Chain brake reassembly Operating testChain catcher replacement Silencer removalSilencer refitting RefitStop switch removal Stop switch resistance measurementStop switch refitting Choke control removalThrottle lock, throttle trigger and return spring removal Choke control refittingThrottle lock, throttle trigger and return spring refitting Switch troubleshooting Generator troubleshootingHand grip heater on model 346XPG, 351G, 353G removal Troubleshooting carburettor heater 346XPG, 351G, 353G Heater element and rear hand grip removal Hand grip heater on model 346XPG, 351G, 353G refittingStarter assembly removal Replacing a broken or worn starter cordTensioning the recoil spring Starter assembly refittingReplacing a worn recoil spring Ignition module/flywheel removal Ignition module testingModel 346XP, 351 Replacing the generator, model 346XP, 351 Generator refittingIgnition module and flywheel refitting Centrifugal clutch removal Inspection and cleaningCentrifugal clutch refitting Oil pump removal 346XP, 350, 351 ModelOil pump removal 340 Oil pump -refitting 346XP, 350, 351Oil pump -refitting 340 Adjustable oil pump adjustment 346XP, 350, 351 Carburettor removalCarburettor dismantling On saws with a carburettor heater 346XPG, 351G, 353GCarburettor reassembly Carburettor refitting Carburettor pressure testingOn saws with a carburettor heater 346XPG, 351G, 353G Carburettor heater 346XP, 351, 353 Refitting Air intake system removal Air intake system refitting Basic requirements Carburettor adjustmentLow speed jet L Fine adjustment of idling speed T Carburettor correct adjustmentFuel tank removal High speed jet HReplacing the fuel filter Replacing the fuel hoseTank vent testing Fuel tank refittingModels 340 Piston and cylinder removalIf replacing the cylinder Decompression valve pressure testing Piston and cylinder refitting 346XP, 350, 351 Cylinder pressure testing Piston and cylinder refitting 340Crankcase and crankshaft dismantling 346XP, 351 Crankshaft bearings replacement 346XP, 351 Sealing ring replacementSealing ring replacement drive side Crankshaft complete dismantling 340, 345Crankcase and crankshaft reassembly 346XP, 351 Crankshaft bearings 340, 345, 350 replacementTake care to avoid damaging the crank- case Crankshaft complete 340, 345, 350 reassembly Guide bar bolts replacement Repairing damaged threadsThread insert Basic adjustment for EPA II carburetors Replacement of the L-needleCheck that H-needle must not rotate114 01 2003W12

340, 345, 346XP,350, 351, 353 specifications

Husqvarna is renowned for its high-quality chainsaws, and the Husqvarna 340, 345, 346XP, 350, 351, and 353 models are no exceptions. These models have garnered a reputation among both professional and amateur users for their reliability, durability, and cutting performance.

The Husqvarna 340 is an entry-level model designed for homeowners and light-duty tasks. It features a 40cc engine that provides a good balance of power and weight, making it easy to handle during extended use. The 340 is equipped with low-vibration technology, significantly reducing operator fatigue and making it suitable for less experienced users.

The Husqvarna 345 is slightly more powerful than the 340, boasting a 45.7cc engine. This model is ideal for users who require a bit more power for medium-duty tasks. It incorporates the air injection system, which helps to separate larger debris before it reaches the air filter, prolonging the life of the filter and maintaining optimal performance.

Moving up the range, the Husqvarna 346XP is a powerful professional chainsaw tailored for demanding tasks. With a 50.2cc engine and the X-Torq engine technology, it provides high cutting performance while reducing fuel consumption and emissions. The 346XP features an adjustable oil pump that allows for precise lubrication, making it an excellent choice for commercial users.

The Husqvarna 350 shares similarities with the 346XP but is designed for users who need a well-rounded saw for various applications. Its 50.2cc engine delivers ample power, and the ergonomically designed handle provides comfort during prolonged use. The chainsaw's advanced starting system ensures easy ignition, even in challenging conditions.

The 351 is another versatile option, equipped with a 50cc engine, designed for both professional and home use. It emphasizes user comfort and ease of handling. The compact design combined with features such as an efficient air filtration system makes the 351 suitable for long hours of work.

Lastly, the Husqvarna 353 is a heavy-duty model that excels in performance and longevity. It has a 50cc engine and incorporates various safety features, including a chain brake and throttle lock, to ensure safe operation. The saw also utilizes the unique anti-vibration system, minimizing vibrations that can lead to user fatigue.

In summary, the Husqvarna 340, 345, 346XP, 350, 351, and 353 models each offer distinct features catering to a wide range of users. From homeowners tackling light tasks to professionals requiring rugged performance, these chainsaws showcase Husqvarna's commitment to quality, innovation, and user-centric design.
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