Husqvarna 550XPG, 545 manual Fuel Handling

Page 18

FUEL HANDLING

Fuel

Note! The machine is equipped with a two-stroke engine and must always be run using a mixture of petrol and two- stroke oil. It is important to accurately measure the amount of oil to be mixed to ensure that the correct mixture is obtained. When mixing small amounts of fuel, even small inaccuracies can drastically affect the ratio of the mixture.

!

WARNING! Always ensure there is

adequate ventilation when handling fuel.

 

Petrol

Use good quality unleaded or leaded petrol.

CAUTION! Engines equipped with catalytic converters must be run on unleaded fuel mixtures. Leaded gasoline will destroy the catalytic converter and it will no longer serve its purpose. The green fuel cap on saws fitted with catalytic converters means that only unleaded gasoline can be used.

The lowest recommended octane grade is 90 (RON). If you run the engine on a lower octane grade than 90 so-called knocking can occur. This gives rise to a high engine temperature and increased bearing load, which can result in serious engine damage.

When working with continuous high revs (e.g. limbing) a higher octane is recommended.

Environment fuel

HUSQVARNA recommends the use of alkylate fuel, either Aspen two-stroke fuel or environmental fuel for four-stroke engines blended with two-stroke oil as set out below. Note that carburettor adjustment may be necessary when changing the type of fuel (see the instructions under the heading Carburettor).

Running-in

Avoid running at a too high speed for extended periods during the first 10 hours.

Two-stroke oil

For best results and performance use HUSQVARNA two-stroke engine oil, which is specially formulated for our air-cooled two-stroke engines.

Never use two-stroke oil intended for water-cooled engines, sometimes referred to as outboard oil (rated TCW).

Never use oil intended for four-stroke engines.

A poor oil quality and/or too high oil/fuel ratio may jeopardise function and decrease the life time of catalytic converters.

Mixing ratio

1:50 (2%) with HUSQVARNA two-stroke oil.

1:33 (3%) with oils class JASO FB or ISO EGB formulated for air-cooled, two-stroke engines.

Petrol, litre

Two-stroke oil, litre

 

 

 

 

2% (1:50)

3% (1:33)

 

 

 

5

0,10

0,15

 

 

 

10

0,20

0,30

 

 

 

15

0,30

0,45

 

 

 

20

0,40

0,60

 

 

 

Mixing

Always mix the petrol and oil in a clean container intended for fuel.

Always start by filling half the amount of the petrol to be used. Then add the entire amount of oil. Mix (shake) the fuel mixture. Add the remaining amount of petrol.

Mix (shake) the fuel mixture thoroughly before filling the machine’s fuel tank.

Do not mix more than one month’s supply of fuel at a time.

If the machine is not used for some time the fuel tank should be emptied and cleaned.

Chain oil

We recommend the use of special oil (chain oil) with good adhesion characteristics.

Never use waste oil. This results in damage to the oil pump, the bar and the chain.

It is important to use oil of the right grade (suitable viscosity range) to suit the air temperature.

In temperatures below 0°C (32°F) some oils become too viscous. This can overload the oil pump and result in damage to the oil pump components.

Contact your service agent when choosing chain oil.

18 – English

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Contents Operator′s manual KEY to Symbols Symbols on the machineDecompression valve Symbols in the operator’s manual Contents Introduction Dear CustomerWhat is WHAT? What is what on the chain saw?General Safety Precautions Before using a new chain sawPersonal protective equipment Machine′s safety equipmentAlways use common sense Chain brake and front hand guardGeneral Safety Precautions Right hand guard Throttle lockoutChain catcher Vibration damping systemMuffler Stop switchCutting equipment General rulesCutting equipment designed to reduce kickback Sharpening your chain and adjusting depth gauge setting Lubricating cutting equipment Adjustment of depth gauge settingTensioning the chain Cause serious or even fatal injuryChain drive sprocket Filling with chain oilChecking chain lubrication Needle bearing lubricationChecking wear on cutting equipment Fitting a spike bumper AssemblyFitting the bar and chain Working with the chainFuel Handling FuelTransport and storage Fuel safetyFueling Long-term storageStarting Starting and StoppingStarting and stopping Cold engineStopping Before use Basic safety rulesWorking Techniques General working instructionsWorking Techniques Basic cutting technique TermsLimbing Tree felling technique Safe distanceFelling direction Felling Training we advise you not to fell trees Clearing the trunk and preparing your retreatFelling cut Your sawFreeing a trapped tree General adviceFreeing a tree that has fallen badly Cutting trees and branches that are in tensionHow to avoid kickback What is kickback?Cutting the trunk into logs Maintenance Carburettor adjustmentGeneral Checking the inertia brake release Checking the brake triggerImmediately Muffler Starter Changing a broken or worn starter cordTensioning the recoil spring Changing a broken recoil spring Air filterSpark plug Fitting the starterLubricating the bar tip sprocket Adjustment of the oil pumpRunning when making adjustments Needle bearing lubricationWinter use Air Injection centrifugal cleaningTemperature 0C or colder Heated handlesMaintenance schedule Daily maintenance Weekly maintenance Monthly maintenanceTechnical Data Technical data550XP TrioBrake 550XPG Guide bar and chain combinations Saw chain filing and file gaugesEC-declaration of conformity Applies to Europe onlyEN ISO 12100-2/A12009, Cispr 122007, EN ISO Page Page