Husqvarna 455e, 455, 460 manual High speed jet H, Correctly adjusted carburettor

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MAINTENANCE

High speed jet H

At the factory the engine is adjusted at sea level. When working at a high altitude or in different weather conditions, temperatures and atmospheric humidity, it may be necessary to make minor adjustments to the high speed jet.

CAUTION! If the high speed jet is screwed in too far, it may damage the piston/cylinder.

When test run at the factory, the high speed jet is set so that the engine satisfies the applicable legal requirements at the same time as achieving maximum performance. The carburettor’s high speed jet is then locked using a limiter cap in the fully screwed out position. The limiter cap limits the potential to adjust the high speed jet to at most half a turn.

To adjust the carburettor correctly you should contact a mechanic with access to a rev counter.

CAUTION! As the spark is cut off, the rev counter does not show speeds higher than 13600 rpm.

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.

Checking the inertia brake release

Place the chain saw, with the engine switched off, on a stump or other stable surface. Release the front handle and let the saw fall by its own weight, rotating around the rear handle towards the stump.

When the bar hits the stump the brake should be applied.

32 – English

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Contents 455e Rancher Symbols in the operator’s manual KEY to SymbolsSymbols on the machine Contents Introduction Dear CustomerWhat is WHAT? What is what on the chain saw?Always use common sense General Safety PrecautionsBefore using a new chain saw Chain brake and front hand guard Machine′s safety equipmentPersonal protective equipment General Safety Precautions Right hand guard Throttle lockoutChain catcher Stop switch Cutting equipmentVibration damping system MufflerGeneral rules Cutting equipment designed to reduce kickbackBar ChainSharpening cutting teeth Sharpening your chain and adjusting depth gauge settingGeneral information on sharpening cutting teeth General advice on adjusting depth gauge setting Adjustment of depth gauge settingTensioning the chain RancherLubricating cutting equipment 455e RancherChain oil Filling with chain oilChecking chain lubrication Chain drive sprocketNeedle bearing lubrication Checking wear on cutting equipmentBar Assembly Fitting the bar and chainRancher 455e RancherFitting a spike bumper Fuel Handling FuelFuel safety FuellingTransport and storage Long-term storageStarting and Stopping Starting and stoppingCold engine Warm engineStopping Basic safety rules Working TechniquesBefore use General working instructionsAlways use a fast cutting speed, i.e. full throttle Terms Basic cutting techniqueGeneral Limbing CuttingTree felling technique Safe distanceFelling direction Clearing the trunk and preparing your retreatFelling Directional cutsGeneral advice Freeing a tree that has fallen badlyFreeing a trapped tree Cutting trees and branches that are in tensionCutting the trunk into logs How to avoid kickbackWhat is kickback? General MaintenanceCarburettor adjustment Correctly adjusted carburettor High speed jet HChecking brake band wear Checking the front hand guardChecking the brake trigger Changing a broken or worn starter cord MufflerStarter Air filter Tensioning the recoil springChanging a broken recoil spring Fitting the starterAdjustment of the oil pump Spark plugLubricating the bar tip sprocket Needle bearing lubricationAir Injection centrifugal cleaning Temperature 0C or colderTemperature -5C or colder Cooling systemMaintenance schedule Daily maintenance Weekly maintenance Monthly maintenanceTechnical Data Technical dataBar and chain combinations Saw chain filing and file gaugesEC-declaration of conformity Applies to Europe only´z+R9¶6x¨ Page 1150250-26 ´z+R9¶6x¨ ´z+R9¶6x¨
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