English / USA

 

 

Tensioning the Saw Chain

Checking Chain Tension

Fuel

1

KN

 

133BA024

Retensioning during cutting work:

:Shut off the engine first – and then loosen the nut.

:Hold the bar nose up and use screwdriver to turn tensioning screw

(1) clockwise until chain fits snugly against the underside of the bar.

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

:Go to chapter “Checking Chain Tension”.

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

:Check chain tension frequently – see chapter "Operating Instructions".

143BA007 KN

:Shut off the engine.

:Wear work gloves.

:Chain must fit snugly against the underside of the bar – and, with the chain brake disengaged, it must still be possible to pull the chain along the bar by hand.

:If necessary, retension the chain.

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

Check chain tension frequently – see "Operating Instructions".

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

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

Use mid-grade unleaded gasoline with a minimum octane rating of 89 (R+M/2). If the octane rating of the mid-grade gasoline in your area is lower, use premium unleaded fuel.

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 nationally recognized name brand unleaded gasoline!

28

MS 440, MS 440 W, MS 440 C