Guide Bar, Chain and Sprocket
The groove
depth should be measured at the point where
the bar is stressed most. That
is
the bar nose on Duroma-
tic bars and the
area
where
most
of the cutting is done
on
Rollomatic bars. The guide bar
must
be replaced when
groove depth is less than the
specified minimum.
On Rollomatic guide bars it is
not necessary to seperately
lubricate the sprocket
nose
bearing
because the chain oil
which flows to the bearing by way of the bar groove during
normal
operation is adequate for lubrication.
38
Checking chain
lubrication
Breaking in Oilomatic chain
Every new
chain has
to
be broken in for
about
2 to 3
minu-
tes. Ample chain
lubrication is essential during this
period.
After breaking in,
stop the engine, check chain tension
and
adjust if
necessary.
Chain lubrication
Never operate the chain
saw without proper chain
lubrica-
tion. If the chain is
allowed to run dry the whole
cutting
attachment will be irretrievably damaged
within a
very
short time.
For this
reason you
should always check
operation of
the chain lubricating system and the
level
in
the oil tank before
starting work.
Start the
saw
and hold the cutting attachment over a
light
patch of ground. Take care
the Oilomatic chain must
not
touch the ground; hold it at least 20
cm (8 in) clear of
the
ground. Run the engine
at
about half
throttle. If an
increas-
ing film of oil
can
be
seen
on
the ground, chain
lubrication
is operating correctly.
Guide bar
The nose and underside of the guide bar are subject to a
particularly high
rate
of
wear.
To avoid one-sided
wear, turn
the bar
over every
time
you
resharpen
or
replace the chain.
Regular cleaning of the oil 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 must be maintained
in order
to prevent the drive links contacting the bottom of the
groove
(the heels of the
cutter
and tie
strap
would
no
longer ride
on
the guide bar rails). The groove depth varies
according to chain
type and pitch:
Chain type Chain
pitch Minimum depth
Rapid 0.325"
6 mm (0.24")
Topic 0.325" 6,5 mm (0.26")
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