Checking and Replacing the Chain Sprocket
• Remove the chain sprocket cover, chain and guide bar.
Replace the chain sprocket:
−
if the wear marks (dimension deeper than 0.02 in (0.5
mm) – the life of the a) on the sprocket are chain
would otherwise be reduced.
The service life of the chain sprocket is prolonged if
it is used with two chains in rotation.
Maintaining and Sharpening Saw Chain
Correctly sharpened chain
A properly sharpened chain slices through wood effort-
lessly and requires very little feed pressure.
Do not work with a dull or damaged saw chain as it will
increase the physical effort required, cause higher vibra-
tions, produce unsatisfactory results anda higher rate of
wear.
•
Clean the chain.
•
Check the chain for cracks in the links and damaged
rivets.
•
Replace any damaged or worn parts of the chain and
match the new parts to the shape and size of the origi-
nal parts by filing back as necessary.
It is necessary to comply with the angles and di-
mensions specified below. If the
sawchain is in-
correctly sharpened
if the depth gauges are too
low – there is an increased risk of kickback and
resulting injury!
The pruner’s saw chain cannot be locked in place
on the guide bar. Therefore, it is best to remove the
chain from the bar and resharpen it on a workshop
sharpening tool.
•
Select the appropriate sharpening tools for the chain
pitch. See „Specifications“ for the permitted chain
pitches.
The chain pitch (e.g. 3/8“) is marked on the depth gauge
of each cutter.
Use only special saw chain files!
Other files have the wrong shape and cut.
Select the file diameter according to the chain pitch.
You must also observe the following angles when re-
sharpening the chain cutters.
A = Filing angle
B = Side plate angle
Furthermore, the angles must be the same on all cutters.
If angles are uneven the chain will run roughly, not in a
straight line, wear quickly and break prematurely.
As these requirements can be met only after sufficient
and constant practice:
•
Use a file holder
A file holder must be used for manual resharpening of
saw chain. The correct filing angles are marked on the
file holder.
GB-26
