Husqvarna 343R, 345RX, 343F, 345FX, 345FXT Tachometer should always be used to find the optimal

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3

 

Fuel system

 

 

 

When checking the speed on a

 

 

 

 

 

NOTE!

 

 

 

 

trimmer no part of the cord

 

 

 

 

A tachometer should always be used to find the optimal

 

 

 

 

should be extended.

 

 

 

 

Use the 502 71 14-01 tachom-

setting.

 

 

 

 

The recommended max. speed must not be exceeded.

 

 

 

 

eter to check the speed.

 

502 71 14-01

 

• Carefully screw in (clock-

 

 

 

 

 

 

wise) the L- and H-jets until

 

 

 

 

 

Idling speed T-screw

 

 

 

 

 

they bottom. Now screw out

 

 

 

 

 

 

(anticlockwise) the needles

Let the engine idle for about 30 seconds or until the speed has

 

 

 

1 turn. The carburettor now

stabilised. Adjust the idling speed T-screw until the engine

 

 

 

has the setting H = 1 and

idles without stopping.

 

 

 

L = 1.

• Turn the screw clockwise if the engine stops.

 

 

 

Use special screwdriver 501

 

 

 

• Turn the screw anticlockwise to lower the speed.

 

501 60 02-03

 

60 02-03.

 

 

 

 

 

 

 

 

 

• Start the engine and run warm for 10 minutes.

Correctly adjusted carburettor

 

 

 

 

A correctly adjusted carburettor means that the engine

Low speed jet L

 

 

accelerates without hesitation and it “splatters” a little at full

 

 

throttle.

Find the highest idling speed by slowly turning the low speed

• A too lean adjusted L-needle can cause starting difficulties

needle clockwise and anticlockwise. When the highest speed

and poor acceleration.

has been found, turn the L-needle 1/4 turn anticlockwise.

• A too lean adjusted H-needle results in lower power, poor

 

 

 

 

High speed jet H

 

 

acceleration and/or damage to the engine.

 

 

• A too rich setting of the “L” and “H” needles give accelera-

The high-speed H-needle affects the engine’s power and

tion problems or a too low working speed.

speed. A too lean H-needle setting (H-needle screwed in too

 

 

far) gives too little fuel to the engine resulting in damage to

NOTE!

 

the engine.

 

 

If the cutting equipment rotates while idling the T-

 

Run the engine at full throttle for about 10 seconds. The H-

screw should be turned anticlockwise until it stops.

 

needle is set correctly when the engine “splatters” a little.

 

 

 

 

If the muffler smokes heavily, at the same time as the engine “splatters” a great deal, the setting is too “rich”. Turn the H- needle clockwise until you find the setting that sounds right.

Carburettors in E-Tech and CARB-EPA designs (CARB II-EPA II only applies to USA and Canada)

On these types of carburettor the H- and L-needles can be adjusted within ex- tremely tight limits, to among other things, comply with the stringent demands with regard to the hydrocarbon and nitrogen oxide content in the exhaust fumes.

The carburettor needles on these carburettors are fitted with plastic sleeves with movement limiters, so-called caps.

To carry out adjustment when replacing needles or the entire carburettor the engine must be under load. This is achieved by fitting a Trimmy Fix with the specified length and diameter of trimmer cord. Consequently, the stated speed will be much lower than with “normal” carburettor adjustment when the engine may run freely.

After replacing the needles or the entire carburettor on a CARB-EPA approved engine, adjustment must be carried out according to the instructions below.

The combiguard or trim guard must be fitted when adjusting the H-needle.

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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 Are not bent or pinched when H-needle is a little shorterThan the L-needle Check carefully that the fuel hosesCarburettor settings Basic settingFine 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 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 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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