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8. Maintenace of guide bar and saw chain

Saw chain

Warning! It is very important that the saw chain is sharp for safe and effective

use of the chain saw.

Chain should be sharpened:

• Whensawdustbecomeslikepowder.

• Whenthechainsawneedstobepressedagainsttheobjecttobecut.

• Whenthecutisnotstraight.

• Whenvibrationincreases:

• Whenuseoffuelincreases:

Warning! Always use work gloves while handling the saw chain.

Before filing begins:

• Makesurethatthechainsawisshutoff.

• Makesurethatthechainsawisheldinasteadygrip.

• Makesurethatyouhavethecorrectequipment:Agoodlewiththecorrectdimension:

Ø 4mm and preferably some type of ﬁling gauge for ﬁling at the right angle and depth.

Chain type: 91VG

File diameter: Ø 4 mm (5/32″)

Place the saw in a cut track or in a screw vice so that both hands can be

used for ﬁling.

Place the ﬁle in a tooth and push the ﬁle forward according to the picture.

File each tooth equally. Keep count of how many cutting teeth which are

ﬁled so you know when the whole chain is ﬁled.

When all the teeth have been ﬁled the clearance heels must be measured

and ﬁled to correct height according to the picture.

Warning! Remember to round off the support heels to reduce the

risk for kickback or chain break.

Figure 35

Figure 36

Round off the support heels

(keep the original angle)

Support size 0.64 mm.

Support template

Figure 37

Check that all the cutting teeth have the same length and cutting angle illustrated in the picture:

Cutter length Filing angle Angle cutting

teeth side

Cutting teeth

Figure 38

CO/Tech PN3800II User Manual

Questions and Answers: