Husqvarna 343R, 345RX, 343F, 345FX, 345FXT manual Fuel pump, Carburettor, Dismantling

Page 19

3

Fuel system

18

Clean the filter externally if it is not too

If the filter is not too dirty, its surface

dirty.

can be cleaned with a brush.

Replace the filter if required.

Otherwise it must be replaced.

 

Check the fuel hose for cracks and

 

leaks.

 

Make sure that the filter’s connection

 

neck is inserted as far as possible into

 

the fuel hose and that the O-ring is

 

sufficiently tight so that the filter cannot

 

slide off the tube.

Fuel pump

Fuel pump

The fuel pump facilitates cold starts.

The fuel pump has the task of facilitat-

The pump cannot be repaired and must

ing the start of the engine when cold.

The pump fills the carburettor with fuel

be replaced if it stops working.

before attempting to start the engine.

Note how the fuel hoses are connected

This also prevents vapour bubbles from

to simplify assembly.

blocking the narrow fuel channels.

 

 

If the pump does not work it must be

 

replaced.

 

Note how the fuel hoses are connected

 

to simplify assembly.

Carburettor

Carburettor

Dismantling

Dismantling

Blow clean the carburettor compartment.

1.Remove the carburettor cover and

Loosen the bolts (A) and remove the

blow the carburettor compartment

clean with compressed air.

nuts (B).

 

 

Remove the fuel hose (C) and fold the

2.Loosen the bolts (A).

 

 

filter holder aside.

3.Remove the nuts (B).

 

 

 

 

 

4.Remove the fuel hose (C) from the

 

 

 

 

 

 

carburettor and the filter holder.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

505 38 13-08

 

502 50 18-01

 

 

Move the fuel tank so far forward that

5.

Move the fuel tank so far forward

the fuel hoses (C) and (D) can be

 

that the fuel hose (C) becomes

removed.

 

 

 

accessible.

 

 

 

 

Move the O-ring back and remove

 

 

 

 

the hose from the nipple.

 

 

 

 

Also remove the fuel hose (D) from

 

 

 

 

the nipple on the tank.

 

 

 

 

 

 

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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 Checking the ignition spark Electrical system502 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 ventingCarburettor Fuel pumpDismantling Metering unit Carburettor’s designBlending unit Dismantling the carburettor Pump unitFuel system For example, the H-needle is a PositionedLittle shorter than the L-needle Assembling the carburettor Are not bent or pinched when H-needle is a little shorterThan the L-needle Check carefully that the fuel hosesBasic setting Carburettor settingsFine adjustment Idling speed T-screw Setting Recommended max. speed must not be exceededCorrectly adjusted carburettor Tachometer should always be used to find the optimalRotating Carburettor adjustment 345RX/FX Adjustment 345RX/FXAdjusting the L-needle Adjusting the H Needle ThrottleCheck 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 When the valve is fitted the small hole must face outwards Turn the valve the right way when fittingDecompression valve Inlet manifold Cleaning, inspectionInsufficient lubrication Analysis and actionsCause 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 To ensure a proper seal Leakage testing CrankcasePress down the sealing plates as Far as possible between the bolts503 55 Husqvarna E-TechPage Tools List of tools 503 84 503 55 502 50 502 52503 97 502 50 505 38 503 80 502 50114 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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