Tensioning the Saw Chain

 

Checking Chain Tension

(side chain tensioner)

 

 

English

Fuel

This engine is certified to operate on unleaded gasoline and the STIHL two- stroke engine oil at a mix ratio of 50:1.

 

KN

1

2011BA056

 

Retensioning during cutting work:

NShut off the engine. N Loosen the nut.

N Hold the bar nose up.

NUse a screwdriver to turn the tensioning screw (1) clockwise until the chain fits snugly against the underside of the bar.

NWhile still holding the bar nose up, tighten down the nut firmly.

NGo to "Checking Chain Tension".

A new chain has to be retensioned more often than one that has been in use for some time.

NCheck chain tension frequently – see chapter on "Operating Instructions".

2011BA057 KN

NShut off the engine.

NWear work gloves to protect your hands.

NThe chain must fit snugly against the underside of the bar and it must still be possible to pull the chain along the bar by hand when the chain brake is released.

NIf necessary, retension the chain.

A new chain has to be retensioned more often than one that has been in use for some time.

NCheck chain tension frequently – see chapter on "Operating Instructions".

Your engine requires a mixture of high- quality gasoline and two-stroke air cooled engine oil.

Use mid-grade unleaded gasoline with a minimum octane rating of 89 ((R+M)/2) and no more than 10% ethanol content.

Fuel with a lower octane rating may increase engine temperatures. This, in turn, increases the risk of piston seizure and damage to the engine.

The chemical composition of the fuel is also important. Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as well. This could cause running problems or even damage the engine. For this reason STIHL recommends that you use only high-quality unleaded gasoline!

Gasoline with an ethanol content of more than 10% can cause running problems and major damage in engines with a manually adjustable carburetor and should not be used in such engines.

The ethanol content in gasoline affects engine running speed – it may be necessary to readjust the carburetor if you use fuels with various ethanol contents.

MS 150 TC

21