Husqvarna 343R, 345RX, 343F, 345FX, 345FXT manual Inlet manifold, Cleaning, inspection

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Cylinder and piston

 

Inlet manifold

 

Remove the air filter and carburettor.

 

Remove the inlet manifold (A) from the

 

partition (B). Check that it does not

 

exhibit cracks or other damage that can

 

cause leaks between the carburettor

 

and cylinder. If necessary, fit a new inlet

 

manifold in the reverse order as set out

 

for dismantling.

 

NOTE!

 

Exercise caution if the inlet

 

manifold is fitted using a

 

screwdriver so as not to make any

 

holes in the rubber wall.

Cleaning, inspection

After dismantling, clean the individual components:

1.Scrape carbon deposits from the top of the piston.

2.Scrape carbon deposits from the cylinder’s combustion chamber.

3.Scrape carbon deposits from the cylinder’s exhaust port.

NOTE!

Scrape carefully with not too sharp a tool so as not to damage the soft aluminium parts.

4.Wash all the components.

5.Inspect the different components for damage and wear. Check the piston and cylinder for seizure damage and wear. Also see the “Analysis and actions” section.

Check the piston ring for wear and damage. Also see the “Analysis and actions” section. Check the gudgeon pin.

–If it has blued, it must be replaced.

–If the piston moves too easily both the piston and the gudgeon pin must be replaced. Check the needle bearing. If it is discoloured or damaged, it must be replaced.

Check the circlips. If they exhibit cracks or are discoloured (caused by overheating), they must be replaced.

Assembly

Lubricate the gudgeon pin’s needle bearing with a few drops of engine oil and fit the piston.

Assembly

Lubricate the gudgeon pin’s needle bearing with a few drops of engine oil. Direct the arrow on the top of the piston towards the exhaust port.

Press in the gudgeon pin and fit the circlips.

NOTE!

Place a rag in the crankcase opening to prevent the circlip from falling into the crankcase in case it should fly out.

Check that the circlips are correctly fitted into the grooves by turning the clips with long-nosed pliers.

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Contents 343R 345RX 343F 345FX 345FXT Workshop Manual Brushcutter, Trimmer Model 343R, 345RX, 343F, 345FX, 345FXT ContentsGeneral recommendations Starter ContentsDismantling 1StarterStarter AssemblyReplacing the drive dogs Electrical system Electrical system Checking the ignition spark502 71 Tip 502 50 Replacing the spark Plug cover502 54 Heated handles Drive dogsWiring diagram Electrical system Fuel system Air filter Fuel systemFuel filter Tank ventingFuel pump CarburettorDismantling Carburettor’s design Metering unitBlending unit Dismantling the carburettor Pump unitFuel system Positioned For example, the H-needle is aLittle shorter than the L-needle Assembling the carburettor Than the L-needle H-needle is a little shorterCheck carefully that the fuel hoses Are not bent or pinched whenCarburettor settings Basic settingFine adjustment Correctly adjusted carburettor Setting Recommended max. speed must not be exceededTachometer should always be used to find the optimal Idling speed T-screwAdjusting the L-needle Adjusting the H Needle Carburettor adjustment 345RX/FX Adjustment 345RX/FXThrottle RotatingCheck for wear on pins a and B Tip Page Centrifugal clutch 502 21 Centrifugal clutchDo not lose the sleeve bearings found in the clutch shoes Centrifugal clutch502 11 Clutch drumChange the bearings in the clutch housing if necessary Page Angle gear Let the small circlip around the axle remain Angle gearInput axle with pinion must be dismantled first 503 97503 80 ShaftCylinder and piston Cylinder and piston Turn the valve the right way when fitting When the valve is fitted the small hole must face outwardsDecompression valve Inlet manifold Cleaning, inspectionAnalysis and actions Insufficient lubricationCause Action Piston scoring caused by heavy carbon deposits Piston ring breakage Piston damage caused by a too high engine speedCause Foreign objectsDefect Action Service tipsWear tolerances Crankshaft and crankcase Crankshaft and crankcase 502 52 Crankshaft and crankcaseInspecting Crankshaft Assembly Press down the sealing plates as Leakage testing CrankcaseFar as possible between the bolts To ensure a proper seal503 55 Husqvarna E-TechPage Tools List of tools 503 97 502 50 505 38 502 50 502 52503 80 502 50 503 84 503 55114 01 2003W24

343R, 345RX, 343F, 345FX, 345FXT specifications

The Husqvarna 343R, 345RX, 343F, 345FX, and 345FXT are designed for efficiency and performance in demanding outdoor tasks. Each model stands out with unique features and technologies tailored to meet various needs, from professional landscaping to residential gardening.

Starting with the Husqvarna 343R, this versatile trimmer is well-known for its lightweight design and powerful performance. It is equipped with a 34 cc engine that delivers a reliable power-to-weight ratio, making it ideal for extended periods of use without excessive fatigue. The 343R features a simple start system, ensuring an easy ignition, while its Tap 'n Go trimmer head permits effortless line feeding, enhancing productivity.

Moving on to the Husqvarna 345RX, this model is favored by professionals for its robust build and advanced technology. Powered by a 45.7 cc engine, it provides superior cutting power suited for heavy-duty tasks. The 345RX comes with an ergonomic handle and a comfortable harness that allows for better weight distribution, which reduces strain during long work sessions. Additionally, the machine's X-Torq engine technology reduces fuel consumption and emissions, making it an environmentally friendly option.

The Husqvarna 343F offers a modest yet efficient powerhouse with its 34 cc engine. It is user-friendly, making it an excellent choice for recreational users or those new to outdoor maintenance. This model features an adjustable handle to accommodate various cutting angles, enhancing versatility according to the user's preference.

Next is the Husqvarna 345FX, an exceptional tool for professional use, boasting a high-performing 45.7 cc engine. The 345FX incorporates advanced vibration dampening technology, resulting in reduced operator fatigue during lengthy operations. Its advanced cutting attachments provide versatility for tackling different vegetation types, enhancing user experience.

Finally, the Husqvarna 345FXT merges performance with functionality. Like the 345FX, it features a 45.7 cc engine with exceptional power, but comes with additional features such as an easy-to-adjust harness and advanced cutting heads. This model is particularly suited for demanding tasks, offering extended run time and increased efficiency.

In summary, Husqvarna’s 343R, 345RX, 343F, 345FX, and 345FXT trimmers are engineered with cutting-edge technologies. Each offers unique features that cater to the distinct needs of both casual users and professionals. These models ensure optimal performance, efficiency, and comfort, making them excellent choices for various outdoor maintenance tasks.
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