Husqvarna 339XP, 334T, 338XPT Trouble shooting methods, High speed, Acceleration and retardation

Page 11

TROUBLE SHOOTING

High speed

Will not run at full

Adjust H-screw

throttle

Blocked air filter

 

 

Tank ventilator blocked

 

Blocked fuel filter

 

Blocked fuel line

 

Loose or faulty fuel pipe

 

Impulse channel leaking

 

Blocked impulse channel

 

Cover on the carburettor’s pump side

 

is loose

 

Faulty pump diaphragm

 

Leaking inlet manifold (rubber)

 

Loose carburettor mounting

 

Control system set too low

 

Damaged control system

 

Incorrectly fitted control system

 

Leaking diaphragm/cover plate

 

Control system sticking

 

Blocked muffler

 

 

Low power

Adjust H-screw

 

Tank ventilator blocked

 

Blocked fuel filter

 

Impulse channel leaking

 

Blocked impulse channel

 

Cover on the carburettor’s pump side

 

is loose

 

Faulty pump diaphragm

 

Blocked air filter

 

Control system sticking

 

Leaking control system (air or fuel)

 

Control system incorrectly assembled

 

Loose diaphragm

 

Hole in diaphragm

 

Leaking diaphragm/cover plate

 

 

Will not "four stroke"

Tank ventilator blocked

 

Blocked fuel filter

 

Blocked fuel line

 

Loose or faulty fuel pipe

 

Impulse channel leaking

 

Blocked impulse channel

 

Cover on the carburettor’s pump side

 

is loose

 

Faulty pump diaphragm

 

Leaking inlet manifold (rubber)

 

Loose carburettor mounting

 

Control system set too low

 

Leaking control system (air or fuel)

 

Control system incorrectly assembled

 

Loose diaphragm

 

Hole in diaphragm

 

Leaking diaphragm/cover plate

 

 

Acceleration and retardation

Does not accelerate

Adjust the L-screw

 

Adjust H-screw

 

Blocked air filter

 

Tank ventilator blocked

 

Blocked fuel filter

 

Blocked fuel line

 

Loose or faulty fuel pipe

 

Blocked impulse channel

 

Cover on the carburettor’s pump side

 

is loose

 

Faulty pump diaphragm

 

Leaking inlet manifold (rubber)

 

Loose carburettor mounting

 

Control system set too low

 

Incorrectly fitted control system

 

Control system sticking

 

Faulty diffuser jet

 

Blocked muffler

 

 

Engine stalls when

Adjust the L-screw

throttle is released

Adjust H-screw

 

Faulty pump diaphragm

 

Control system set too high

 

Control system sticking

 

Faulty diffuser jet

 

 

Too rich acceleration

Adjust the L screw

 

Adjust H-screw

 

Blocked air filter

 

Faulty pump diaphragm

 

Faulty diffuser jet

 

 

Trouble shooting methods

In addition to faults given in the above schematic, trouble shooting can be carried out on a specific component or specific chain saw system. The different procedures are described in respective sections and are as follows:

1.Pressure testing the carburettor. See the chapter "Carburettor".

2.Pressure testing the crankcase and cylinder. See the chapter "Crankshaft, Piston and Cylinder".

English – 11

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Contents 334T 338XPT 336 339XP Contents Introduction Special instructions Safety RegulationsGeneral instructions Symbols Symbol ExplanationTechnical Data NGK Bpmr 7A Tools Pos Description Used for Order No Idling low speed Trouble ShootingTrouble shooting chart StartingAcceleration and retardation Trouble shooting methodsHigh speed Character key Service Data 334T/338XPT10-15 20-26 Service Data 336/339XP 20-26 Dismantling Safety EquipmentCleaning and inspection Chain brakeAssembly Muffler Chain catcherDismantling, 334T, 338XPT Throttle lock and stop functionAssembly 334T, 338XPT Dismantling 336, 339XP Assembly 336, 339XP Starter Cleaning and inspection Ignition System Assembly of the spark plug guard Centrifugal Clutch Centrifugal Clutch Description CarburettorOperation Cold start modePrimer pump Dismantling, 334T, 338XPT Zama C1Q Dismantling 336, 339XP Carburettor Cleaning and inspection of the carburettor Pressure testing Basic adjustment of the high and low speed needles Assembly 334T, 338XPTAssembly 336, 339XP Carburettor Tank Unit Replacing the oil hose and screen Changing the fuel hose and fuel filterReplacing the tank ventilator valve, fuel tank Replacing the tank vent valve, oil tank Replacing the impulse hose Assembly Dismantling AV-SYSTEMAnti vibration system CRANKSHAFT, Piston and Cylinder Faults and causes Cleaning and inspectionAssembly Fitting the decompression valve Pressure testingRemoving the decompression valve BAR Bolt OIL Pump Assembly ´z+H.@¶6f¨ Page 2003W03 114 01Also See
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338XPT, 334T, Chain Saw, 336, 339XP specifications

The Husqvarna 336 is a powerful and reliable chainsaw designed for both professional forestry work and demanding garden tasks. This versatile tool is ideal for users who value durability, performance, and ease of use. The 336 model stands out in the Husqvarna range thanks to its innovative features and cutting-edge technology.

One of the main highlights of the Husqvarna 336 is its efficient engine. Powered by a 34.6 cc, 2.6 kW engine, it strikes a balance between power and weight, ensuring that users can handle it comfortably during extended use. The X-Torq engine technology reduces fuel consumption and emissions, making it an environmentally-friendly option, while still delivering high performance.

The design of the Husqvarna 336 is crafted for maximum user comfort. The chainsaw features an ergonomic handle that ensures a secure and balanced grip, reducing fatigue during long periods of operation. Additionally, the lightweight design enhances maneuverability, allowing users to navigate through tight spaces and tackle challenging cuts with ease.

Safety is paramount in the design of the Husqvarna 336. The chainsaw is equipped with a quick-release air filter system, which makes maintenance simple and efficient. The chain brake works effectively to prevent accidents, and the chainsaw is fitted with a low-vibration system that minimizes vibrations felt by the user, improving overall comfort and control.

Another notable feature of the Husqvarna 336 is its intuitive controls, which allow users to quickly adjust settings and make necessary changes on the job. The model boasts an adjustable oil pump that lets users optimize chain lubrication based on the task at hand. This means improved efficiency and extended chain life, ultimately saving users both time and money.

The chainsaw also incorporates an easy-start mechanism, reducing the effort required to start the engine. This makes the Husqvarna 336 a practical choice for users of all skill levels, from seasoned professionals to beginners looking to tackle their first projects.

In summary, the Husqvarna 336 is a standout chainsaw that combines power, comfort, and advanced technology. Its features, including the X-Torq engine, ergonomic design, safety elements, and ease of maintenance, make it an excellent investment for anyone serious about forestry work or outdoor upkeep. Whether pruning trees, cutting firewood, or felling small trees, the Husqvarna 336 excels in performance and reliability, ensuring users get the job done efficiently and effectively.