6

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

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.

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