Cutting Attachment - Stihl 090 Instruction Manual / Owners Manual

Cutting Attachment
, OUlntet borings
2
Gente, r ing borings
The cutting attachment of a chain saw consists of the guide
bar; saw chain and chain sprocket
GuJdebar
The nose and underside of the guide bar are subject to a
particularly high rate of wear. To avoid one-sided wear, tum
the bar around every time you resharpen or replace the
chain. Regular cleaning of the
011
Inlet holes
and
guide bar
groove is also important. The bar can be examined for signs
of wear
at
the same
time.
A minimum bar groove depth of 7 mm (0.28 in) must be
maintained in order to prevent the drive Unks fouling the
bottom of the groove (the heels of the culler and tie
strap
would no longer locate on the guide bar track).
This depth should be measured at the point where the bat
is
stressed
mOst,
I.
e. the bar noee or: D'..!romatic bars and
the area where most of the cuttiilg is done on RoliomaUc
bars. The guide bar must be replaced .1f the minimum depth
28
can not be maintained.
On Roliomatic guide bars the bearing 01 the nose sprocket
must also be lubricated at regulated intervals with the
appropriate grease gun. Lubricate at least once druly under
normal operating conditions. Only use a high grade grease
for refilling the grease gun. e.g. refill lUbe 0781120 1111.
To lubricate, place chain
saw
on
its
side so that the bar
nose is firmly supported. Clean the grease hole and pump
in grease while slowly pulling saw chain around bar
(sprocket
rotates)
so thai bearing is uniformly filled. When
grease emerges at the hole on the other
sid!>
of the bar or
around !be nose. sprocket, repeat the procedure on the
other side.
The sprocket nose bearing should
be greased more often ff
the
cutting
attachment is used in damp conditions, e.g.
working in snow. AfII!r finishing cutting work the sprocket
nose should be .thoroughly greased from both sides
to
force moisture out of the bearing and prevent corrosion.
Chain lubrication
Never operate the chain saw without proper chain lubrica-
tion. Check operation of chain lubrication and level in 01 1
tank before starting work.
Hold chain saw with mounted cutting attachment over a
light background. Take care, the Ollomatic chain must not
touch the ground. i. e. keep H at least 20 em (8 in) clear of
the ground. Run the engine with haH-throttle position.
ff an increasing patch of oil can be seen, chain lubrication
is operating correctly.