Husqvarna 334T, 339XP, 338XPT Trouble Shooting, Trouble shooting chart, Starting, Idling low speed

Page 10

TROUBLE SHOOTING

Trouble shooting chart

The different faults that can occur on the chain saw are divided into four groups as follows. Within each group possible operating faults are listed to the left while the probable fault alternatives are listed to the right. The most likely fault is listed first, etc.

Starting

Difficult to start

Adjust the L-screw

 

Air filter blocked

 

Choke does not work

 

Worn choke axle

 

Worn choke valve

 

Blocked fuel filter

 

Blocked fuel line

 

Piston ring seized

 

Blocked impulse channel

 

 

Carburettor leaks

Loose or faulty fuel pipe

fuel

Hole in diaphragm

 

Worn needle/needle tip

 

Control system sticking

 

Control system set too high

 

Leaking control system (air or fuel)

 

Cover on the carburettor’s pump side

 

is loose

 

 

Floods when the

Worn needle/needle tip

engine is not running

Control system set too high

 

 

Control system sticking

 

 

Idling (low speed)

Does not idle

Adjust the L-screw

 

Leaking inlet manifold (rubber)

 

Loose carburettor mounting

 

Loose or faulty fuel pipe

 

Blocked fuel filter

 

Blocked fuel line

 

Tank ventilator blocked

 

Throttle valve axle stiff

 

Throttle sticks

 

Defective throttle return spring

 

Bent valve axle stop

 

Faulty diffuser jet

 

 

Too rich idling

Adjust the L screw

 

Worn needle/needle tip

 

Control system set too high

 

Worn lever arm in the control system

 

Leaking diaphragm/cover plate

 

Control system sticking

 

 

Idling (low speed) (continued)

Idling with closed L

Worn needle/needle tip

screw

Leaking diaphragm/cover plate

 

 

Control system sticking

 

Worn lever arm in the control system

 

Faulty diffuser jet

 

 

Uneven idling

Blocked fuel filter

 

Blocked fuel line

 

Leaking inlet manifold (rubber)

 

Loose carburettor mounting

 

Worn throttle valve axle

 

Loose throttle valve screw

 

Worn throttle valve

 

Control system sticking

 

Leaking control system (air or fuel)

 

Control system’s centre knob is worn

 

Hole in diaphragm

 

Leaking diaphragm/cover plate

 

Leaking crankcase

 

 

L-screw needs

Blocked fuel line

constant adjustment

Control system set too high

 

 

Control system sticking

 

Leaking control system (air or fuel)

 

Leaking diaphragm/cover plate

 

Faulty diffuser jet

 

Leaking crankcase

 

 

Too much fuel while

Control system set too high

idling

Control system sticking

 

 

Damaged control system

 

Worn needle/needle tip

 

Leaking diaphragm/cover plate

 

Incorrectly fitted control system

 

 

10 – English

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Contents 334T 338XPT 336 339XP Contents Introduction General instructions Safety RegulationsSpecial instructions Symbol Explanation SymbolsTechnical Data NGK Bpmr 7A Tools Pos Description Used for Order No Starting Trouble ShootingTrouble shooting chart Idling low speedHigh speed Trouble shooting methodsAcceleration and retardation Service Data 334T/338XPT Character key10-15 20-26 Service Data 336/339XP 20-26 Chain brake Safety EquipmentCleaning and inspection DismantlingAssembly Chain catcher MufflerThrottle lock and stop function Dismantling, 334T, 338XPTAssembly 334T, 338XPT Dismantling 336, 339XP Assembly 336, 339XP Starter Cleaning and inspection Ignition System Assembly of the spark plug guard Centrifugal Clutch Centrifugal Clutch Carburettor DescriptionCold start mode OperationPrimer pump Dismantling, 334T, 338XPT Zama C1Q Dismantling 336, 339XP Carburettor Cleaning and inspection of the carburettor Pressure testing Assembly 334T, 338XPT Basic adjustment of the high and low speed needlesAssembly 336, 339XP Carburettor Tank Unit Replacing the tank ventilator valve, fuel tank Changing the fuel hose and fuel filterReplacing the oil hose and screen Replacing the tank vent valve, oil tank Replacing the impulse hose Assembly Anti vibration system AV-SYSTEMDismantling CRANKSHAFT, Piston and Cylinder Cleaning and inspection Faults and causesAssembly Removing the decompression valve Pressure testingFitting the decompression valve BAR Bolt OIL Pump Assembly ´z+H.@¶6f¨ Page 114 01 2003W03Also 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.