Chain sharpening
General
Blunt chains and skewly sharpened chains entail great wear on the saw chain sword and risk of
extra costs and complications.
In order to avoid this, Duun VM420 is designed so that the saw chain always must be dismantled
from the machine for any sharpening or replacement.
As a starting point, we recommend replacement of the chain or sharpening in equipment
designed for this purpose.
Alternatively, the saw chain may be sharpened in accordance with the standard procedure with a
file with file gauge for 5.5mm chain and rider gauge. This is to safeguard against faulty
sharpening and complications.
1. Before any sharpening work is initiated – stop the machine and tractor and remove the
key to ensure unintentional start during the work.
2. Always use work gloves during work with the chain!
3. The covers over the chain proper and the cover over the splitting cradle as sketched
4. To replace the chain, the screw A is released (first release the nuts B) as far so at to allow
the chain to be removed in the back for maintenance or replacement.
5. File dimension 5.5mm similar for older chain saws.
The chain is now available for sharpening with a round file from both sides. It is very important to
maintain the correct shape of the teeth as illustrated. The main concern is to employ the correct
file dimension and make sure you maintain the correct angle of the cutting edge – i.e. 30 – 35
degrees. Figure F shows the correct shape of a sharpened tooth.
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