Husqvarna 343R, 345RX, 343F, 345FX, 345FXT Carburettor adjustment 345RX/FX Adjustment 345RX/FX

Page 28

 

 

 

 

 

 

 

 

Fuel system

3

 

Carburettor adjustment 345RX/FX

 

 

 

Carburettor

adjustment 345RX/FX

 

 

 

 

 

Adjusting the L-needle

 

 

 

Adjusting the H-

needle

 

 

1.

Mount the Trimmy Fix (4 wires) and use 3.3 mm smooth

 

 

 

1. Mount the Trimmy

Fix (4 wires) and use 3.3 mm smooth

 

 

cord. The cord length should be 160 mm measured from the

 

 

 

cord. The cord

length should be 160 mm measured from

 

 

end of the cord to the cord bushing on the trimmer head.

 

 

 

the end of the cord to the cord bushing on the trimmer

 

2.

Run the engine warm for about 5 minutes.

 

 

 

head.

 

 

 

 

 

 

 

 

 

3.

Turn the L-needle so that the highest speed is attained.

 

 

 

2. Run the engine warm for about 5 minutes.

 

 

 

 

 

 

 

 

 

4.

If the speed exceeds 3,700 rpm, reduce it with the aid of the

 

 

 

3. Turn the H-needle so that the highest speed is attained.

 

 

 

 

 

 

 

 

 

idling speed’s T-screw (T) and a carry out a new adjustment

 

 

 

4. Reduce the speed by 400 rpm by turning the H-needle

 

 

in accordance with point 3.

 

 

 

anticlockwise. Mount the plastic sleeve on the H-needle

 

5.

Then turn the L-needle anticlockwise so that the speed drops

 

 

 

so that it cannot be turned anticlockwise.

 

 

 

 

 

 

 

 

 

 

by 300 rpm.

 

 

 

5. Then increase the speed by 200 rpm by turning the H-

 

6.

Then adjust the idling speed to 2,800 rpm by turning the T-

 

 

 

needle clockwise.

 

 

 

 

 

 

 

 

 

 

screw.

 

 

 

 

 

 

 

7.

When mounting the plastic sleeve on the L-needle, the

 

 

 

NOTE!

 

 

 

needle is turned a quarter-turn anticlockwise once the

 

 

 

If the cutting equipment rotates while idling the T-

 

 

 

optimal setting has been made and the plastic sleeve is

 

 

 

screw should be turned anticlockwise until it stops

 

 

mounted so that the needle cannot be turned anticlockwise.

 

 

 

rotating.

 

 

 

Then turn the L-needle back a quarter-turn.

 

 

 

 

 

 

 

 

 

 

 

 

Carburettor needles with Zama “caps”.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

531 00 48-63

 

531 03 03-98

 

Throttle

Throttle

Disassemble the cable protector (B),

Remove the bolt (A) and cable protec-

the cover (D) and the throttle from the

tor (B).

handle.

Remove the two bolts (C) and the cover

 

Remove the bolts and separate the two

(D).

halves of the throttle.

Remove the bolt (E) that attaches the

 

 

throttle to the handle and remove the

 

throttle.

 

Remove the bolts and separate the two

 

halves of the throttle.

502 50 18-01

 

27

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Contents 343R 345RX 343F 345FX 345FXT Model 343R, 345RX, 343F, 345FX, 345FXT Contents Workshop Manual Brushcutter, TrimmerGeneral recommendations Contents Starter1Starter DismantlingAssembly StarterReplacing the drive dogs Electrical system Checking the ignition spark Electrical system502 71 Tip Replacing the spark Plug cover 502 50502 54 Drive dogs Heated handlesWiring diagram Electrical system Fuel system Fuel system Air filterTank venting Fuel filterCarburettor Fuel pumpDismantling Metering unit Carburettor’s designBlending unit Pump unit Dismantling the carburettorFuel system For example, the H-needle is a PositionedLittle shorter than the L-needle Assembling the carburettor H-needle is a little shorter Than the L-needleCheck carefully that the fuel hoses Are not bent or pinched whenBasic setting Carburettor settingsFine adjustment Setting Recommended max. speed must not be exceeded Correctly adjusted carburettorTachometer should always be used to find the optimal Idling speed T-screwCarburettor adjustment 345RX/FX Adjustment 345RX/FX Adjusting the L-needle Adjusting the H NeedleThrottle RotatingCheck for wear on pins a and B Tip Page Centrifugal clutch Centrifugal clutch 502 21Centrifugal clutch Do not lose the sleeve bearings found in the clutch shoesClutch drum 502 11Change the bearings in the clutch housing if necessary Page Angle gear Angle gear Let the small circlip around the axle remain503 97 Input axle with pinion must be dismantled firstShaft 503 80Cylinder 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 Cleaning, inspection Inlet manifoldInsufficient lubrication Analysis and actionsCause Action Piston scoring caused by heavy carbon deposits Piston damage caused by a too high engine speed Piston ring breakageForeign objects CauseService tips Defect ActionWear tolerances Crankshaft and crankcase Crankshaft and crankcase Crankshaft and crankcase 502 52Inspecting Crankshaft Assembly Leakage testing Crankcase Press down the sealing plates asFar as possible between the bolts To ensure a proper sealHusqvarna E-Tech 503 55Page Tools List of tools 502 50 502 52 503 97 502 50 505 38503 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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