Tensioning The Saw Chain (Side Chain Tensioner); Checking Chain Tension; Fuel - Stihl MS 151 C Instruction Manual

7 Tensioning the Saw Chain (side chain tensioner)

2
► Turn the screw (2) clockwise until there is very
little chain sag on the underside of the bar –
and the drive link tangs are engaged in the bar
groove
► Refit the sprocket cover –
the pivot pin on the hand guard must engage
the guard on the engine housing – and then
screw the nut onto the stud fingertight
► go to chapter "Tensioning the Chain"
7 Tensioning the Saw Chain
(side chain tensioner)
1
Retensioning during cutting work:
► Shut down the engine.
► Loosen the nut.
► Hold the bar nose up.
► Use a screwdriver to turn the tensioning
screw (1) clockwise until the chain fits snugly
against the underside of the bar.
► While still holding the bar nose up, tighten
down the nut firmly.
0458-506-0121-C
► Go to "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
on "Operating Instructions".
8

Checking Chain Tension

► Shut down the engine.
► Wear work gloves to protect your hands.
► The chain must fit snugly against the under‐
side of the bar and it must still be possible to
pull the chain along the bar by hand when the
chain brake is released.
► 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 chapter
on "Operating Instructions".
9

Fuel

The engine requires a mixture of gasoline and
engine oil.
WARNING
Avoid direct skin contact with fuel and breathing
in of gasoline fumes.
9.1 STIHL MotoMix
STIHL recommends using STIHL MotoMix. This
pre-blended fuel is free of benzene and lead, is
distinguished by a high octane rating, and
always provides the proper mixing ratio.
STIHL MotoMix uses STIHL HP Ultra two-stroke
engine oil for optimum engine life.
MotoMix is not available in all markets.
English
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