Husqvarna 445, 445e, 450e manual Maintenance, General, Carburettor adjustment

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MAINTENANCE

MAINTENANCE

General

The user must only carry out the maintenance and service work described in this Operator’s Manual. More extensive work must be carried out by an authorised service workshop.

Carburettor adjustment

Your Husqvarna product has been designed and manufactured to specifications that reduce harmful emissions.

Function

•The carburettor governs the engine’s speed via the throttle control. Air and fuel are mixed in the carburettor. The air/fuel mixture is adjustable. Correct adjustment is essential to get the best performance from the machine.

•The T-screw regulates the throttle setting at idle speed. If the T-screw is turned clockwise this gives a higher idle speed; turning it anti-clockwise gives a lower idle speed.

Basic settings and running in

The basic carburettor settings are adjusted during testing at the factory. Fine adjustment should be carried out by a skilled technician.

Rec. idle speed: See the Technical data section.

Fine adjustment of the idle speed T

Adjust the idle speed with the T-screw. If it is necessary to re-adjust, turn the T-screw clockwise while the engine is running, until the chain starts to rotate. Then turn anti- clockwise until the chain stops. When the idle speed is correctly adjusted the engine should run smoothly in every position and the engine speed should be safely below the speed at which the chain starts to rotate.

WARNING! Contact your servicing

! dealer, if the idle speed setting cannot be adjusted so that the chain stops. Do not use the chain saw until it has been properly adjusted or repaired.

Correctly adjusted carburettor

When the carburettor is correctly adjusted the machine accelerates without hesitation and 4-cycles a little at full throttle. It is also important that the chain does not rotate at idle. If the L-jet is set too lean it may cause starting difficulties and poor acceleration. If the H-jet is set too lean the machine will have less power, poor acceleration and could suffer damage to the engine.

Checking, maintaining and servicing chain saw safety equipment

Note! All service and repair work on the machine demands special training. This is especially true of the machine’s safety equipment. If your machine fails any of the checks described below we recommend that you take it to your service workshop.

Chain brake and front hand guard

Checking brake band wear

Brush off any wood dust, resin and dirt from the chain brake and clutch drum. Dirt and wear can impair operation of the brake.

Regularly check that the brake band is at least 0.6 mm thick at its thinnest point.

Checking the front hand guard

Make sure the front hand guard is not damaged and that there are no visible defects such as cracks.

Move the front hand guard forwards and back to make sure it moves freely and that it is securely anchored to the clutch cover.

115 10 81-26 Rev.2 2008-01-11

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Contents 445 445e 450e Operator′s manualSymbols on the machine KEY TO SYMBOLSSymbols in the operator’s manual Contents CONTENTSDear Customer INTRODUCTIONWhat is what on the chain saw? WHAT IS WHAT?Before using a new chain saw GENERAL SAFETY PRECAUTIONSChain brake and front hand guard Machine′s safety equipmentAlways use common sense Personal protective equipment8 – English Throttle lockout Muffler Stop switchRight hand guard Vibration damping systemGeneral rules Cutting equipmentCutting equipment designed to reduce kickback increases the risk of kickback General information on sharpening cutting teethWARNING! Departure from the sharpening instructions considerablyTensioning the chain General advice on adjusting depth gauge settingincreased if the depth gauge setting is Adjustment of depth gauge setting445e, 450e Filling with chain oil Lubricating cutting equipmentwhich could lead to serious, even fatal injuries Chain oilChain drive sprocket Fitting the bar and chain ASSEMBLYFitting a spike bumper Fuel FUEL HANDLINGLong-termstorage Fuel safetyFuelling Transport and storageStarting and stopping STARTING AND STOPPINGStopping Before use WORKING TECHNIQUESGeneral working instructions 24 – English Basic cutting technique Tree felling technique 12 3Directional cuts Felling directionClearing the trunk and preparing your retreat FellingFelling cut What is kickback? How to avoid kickbackFreeing a tree that has fallen badly Limbing WARNING! A majority of kickback Carburettor adjustment MAINTENANCEGeneral Checking the brake trigger Checking the inertia brake releaseimmediately Muffler Replacing the starter cord StarterTensioning the recoil spring Replacing the return and drive springs Air filterFitting the starter Cooling system Spark plugLubricating the bar tip sprocket Needle bearing lubricationWinter use ”Air Injection” centrifugal cleaningTemperature -5Cor colder Monthly maintenance Maintenance scheduleDaily maintenance Weekly maintenanceTechnical data TECHNICAL DATAPitch, inch Bar and chain combinationsSaw chain filing and file gauges Length, inchApplies to Europe only EC-declarationof conformity´z+S,¶6c¨ ´z+S,¶6c¨ Page 1151081-26 ´z+S,¶6c¨ ´z+S,¶6c¨
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