Husqvarna 343R, 345RX, 343F, 345FX, 345FXT manual Service tips, Defect Action

Page 50

Cylinder and piston

6

Larger, harder particles that enter the engine cause serious damage to the under- side of the piston skirt.

Cause:

Action:

•

Air filter damaged or missing.

Fit a new air filter.

•

Parts from the carburettor or intake

Regular service and inspection.

 

system have come loose and

 

 

entered the engine.

 

Extensive damage to the lower part of the piston’s inlet side.

Service tips

 

 

 

 

 

 

 

Defect:

 

Action:

 

Broken cooling fins, damaged threads or sheared bolts by

 

In severe cases – replace the cylinder.

the exhaust port.

 

Repair the threads using Heli-Coil.

Seizure marks in the cylinder bore (especially by the

 

Polish the damaged area using a fine grade emery cloth

exhaust port).

 

so that the coating of aluminium disappears.

 

 

With deep seizure score marks the piston and cylinder

 

 

should be replaced.

Surface coating in the cylinder bore worn out (primarily at

 

Replace the cylinder and piston.

the top of the cylinder).

 

 

 

The piston shows signs of seizure score marks.

 

Carefully polish the damaged area using a fine file of fine

 

 

grade emery cloth. Before the piston is refitted the cylinder

 

 

should be polished as above. With deep score marks the

 

 

piston and cylinder should be replaced.

Piston ring burnt in its groove.

 

Carefully loosen the piston rings and clean the groove well

 

 

before refitting. Carbon deposits in the groove impair the

 

 

important heat transfer between the piston and cylinder.

 

 

 

 

 

 

NOTE!

 

 

 

Be careful with the lower edge of the piston ring

 

 

 

groove. If this is damaged, or if carbon deposits

 

 

 

remain, the compression pressure can leak through.

 

 

 

 

 

 

Check the wear on the piston ring by placing it in the lower

 

part of the cylinder.

Bolts much too tight in the aluminium material.

Position a suitable punch on the bolt head and give a few

 

sharp knocks with a hammer. If the bolt still does not loosen,

 

repeat the procedure.

 

 

 

 

49

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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 502 71 Electrical systemChecking the ignition spark Tip Replacing the spark Plug cover 502 50502 54 Drive dogs Heated handlesWiring diagram Electrical system Fuel system Fuel system Air filterTank venting Fuel filterDismantling Fuel pumpCarburettor Blending unit Carburettor’s designMetering unit Pump unit Dismantling the carburettorFuel system Little shorter than the L-needle PositionedFor example, the H-needle is a Assembling the carburettor Check carefully that the fuel hoses H-needle is a little shorterThan the L-needle Are not bent or pinched whenFine adjustment Carburettor settingsBasic setting Tachometer should always be used to find the optimal Setting Recommended max. speed must not be exceededCorrectly adjusted carburettor Idling speed T-screwThrottle Carburettor adjustment 345RX/FX Adjustment 345RX/FXAdjusting the L-needle Adjusting the H Needle 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 Decompression valve Turn the valve the right way when fittingWhen the valve is fitted the small hole must face outwards Cleaning, inspection Inlet manifoldCause Action Analysis and actionsInsufficient lubrication 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 Far as possible between the bolts Leakage testing CrankcasePress down the sealing plates as To ensure a proper sealHusqvarna E-Tech 503 55Page Tools List of tools 503 80 502 50 502 50 502 52503 97 502 50 505 38 503 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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