Stihl MS 150 C-E Instruction Manual - Page 23

Tensioning the Saw Chain, side chain tensioner, Checking Chain Tension

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English Tensioning the Saw Chain (side chain tensioner) 1 Retensioning during cutting work: N Shut off the engine. N Loosen the nut. N Hold the bar nose up. N Use a screwdriver to turn the tensioning screw (1) clockwise until the chain fits snugly against the underside of the bar. N While still holding the bar nose up, tighten down the nut firmly. N Go to "Checking Chain Tension". A new chain has to be retensioned more often than one that has been in use for some time. N Check chain tension frequently - see chapter on "Operating Instructions". 2011BA056 KN 2011BA057 KN Checking Chain Tension N Shut off the engine. N Wear work gloves to protect your hands. N The 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. N If necessary, retension the chain. A new chain has to be retensioned more often than one that has been in use for some time. N Check chain tension frequently - see chapter on "Operating Instructions". Fuel This engine is certified to operate on unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of 50:1. Your engine requires a mixture of highquality 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

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MS 150 TC
English
21
Retensioning during cutting work:
N
Shut off the engine.
N
Loosen the nut.
N
Hold the bar nose up.
N
Use a screwdriver to turn the
tensioning screw (1) clockwise until
the chain fits snugly against the
underside of the bar.
N
While still holding the bar nose up,
tighten down the nut firmly.
N
Go to "Checking Chain Tension".
A new chain has to be retensioned more
often than one that has been in use for
some time.
N
Check chain tension frequently –
see chapter on "Operating
Instructions".
N
Shut off the engine.
N
Wear work gloves to protect your
hands.
N
The 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.
N
If necessary, retension the chain.
A new chain has to be retensioned more
often than one that has been in use for
some time.
N
Check chain tension frequently –
see chapter on "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 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.
Tensioning the Saw Chain
(side chain tensioner)
1
2011BA056 KN
Checking Chain Tension
2011BA057 KN
Fuel