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®
3.
OILOMATIC
Saw Chain
3.1
Introduction
STIHL is the only manufacturer to
produce its own chainsaws, guide
bars, saw chains and chain
sprockets.
STIHL offers the right saw chain for
every species of wood and for
chainsaws of all brands and engine
size. The STIHL line of chains is
tailor-made for almost every
application.
All STIHL chains incorporate the
patented, life-prolonging STIHL
®
OILOMATIC
system of lubrication.
Every saw chain produced by
®
STIHL is an "OILOMATIC
3.2
Construction
®
STIHL OILOMATIC
saw chains
are three-link chains and always
assembled in the same basic
pattern. They differ merely in the
shape or the cutters and the
dimensions of the individual links.
The illustration below
shows the component parts of an
®
OILOMATIC
chain.
Drive link (1), left hand cutter (2),
right hand cutter (3), preset tie strap
(4), tie strap (5), humped drive link
(6), triple-hump tie strap (7).
12
The center row is made up entirely
of drive links (1). Engine power is
transmitted via the chain sprocket to
the drive link tangs to rotate the
chain around the guide bar. The
drive link tangs run in the bar groove
and stabilize the chain in the lateral
direction.
The forward edge of the drive link
tang is a rounded hook which acts
as a groove raker or cleaner.
The two outer rows of links are
made up of alternating cutters (2, 3)
and tie straps (4, 5). The cutters (2,
3) are the actual working parts of the
chain. The design and condition of
their cutting edges have a
chain".
significant influence on cutting
results. Tie straps (4, 5) are fitted
opposite the cutters and on both
sides of the chain to fill the gaps
between the cutters. The bottoms of
the tie straps and cutters form a
sliding face on which the chain
glides along the guide bar. On low
kickback saw chains a humped
drive link (6) is fitted in front of each
cutter in place of the normal tie
strap. On the RAPID
rescue saws a special triple-hump
tie strap is fitted on the other side of
the chain in place of the normal tie
strap.
STIHL saw chains are assembled in
such a way that every second drive
link is followed by a cutter, right
hand and left hand cutters being
fitted alternately.
1
2
3
In the case of the full-skip (1) and
semi-skip (2) versions, the spaces
between the cutters are
correspondingly greater or variable.
On the full house chain (3), right
and left hand cutters are assembled
alternately directly behind one
another.
All chain links are held together by
the rivets, the center row of links
(drive links) acting as a hinge for the
two outer rows (cutters and tie
TM
Duro R for
straps). Each link of the chain is
subject to a certain stress. Rivets
and drive links have to transmit the
full torque of the engine when
cutting resistance is high. The force
of this torque is spread equally
between the cutters and tie straps.
Chain and Bar Manual
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