Husqvarna Official Manual for 343R Brush Cutter: Fuel System and Assembly Insights
Page 25

3

Fuel system

 

 

Attach the various parts of the measur-

Attach the various parts of the measur-

 

ing unit in the reverse order as set out

ing unit in the reverse order as set out

 

for dismantling.

for dismantling.

 

 

The lever arm should lie flush with the

 

 

carburettor housing.

 

 

Too high setting = too much fuel.

 

 

Too low setting = too little fuel.

 

 

NOTE!

 

 

The H-needle is a little shorter

 

 

than the L-needle.

 

Check that the carburettor is sealed.

Connect pressure tester 531 03 06-23

 

No leakage is permitted at 50 kPa.

to the fuel intake on the carburettor.

 

 

 

 

Pump up the pressure to 50 kPa.

 

 

Lower the carburettor in a vessel with

 

 

petrol in order to discover any leaks

 

 

more easily.

 

 

No leakage is permitted.

531 03 06-23

Attach the control diaphragm and

Place the gasket on the carburettor

cover.

housing and then the control dia-

 

phragm.

 

Check that the air hole in the cover is

 

open and screw the cover on.

Assembly

Assembly

Slide the carburettor into place and

Slide the carburettor into place.

connect the fuel hoses.

Connect the fuel hose (A) to the carburettor.

 

Make sure that they do not get pinched.

Connect the fuel hose (B) to the carburettor

 

Connect the throttle cable to the

and make sure that it is in the groove (C).

carburettor.

Place the filter holder in place and make

 

 

sure that the fuel hose (D) is under the

 

carburettor and is not pinched.

 

Connect the throttle cable (E) to the

 

carburettor.

 

Screw down the filter holder and attach

 

the air filter.

 

NOTE!

 

Check carefully that the fuel hoses

 

are not bent or pinched when the

 

fuel tank is pushed back into

 

place against the engine body.

24

 

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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 Than the L-needle H-needle is a little shorterCheck carefully that the fuel hoses Are not bent or pinched whenBasic setting Carburettor settingsFine 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 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 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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