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which are designed for chain saws.
Never use regenerated or previously used oil for chain lubrication.
4.5. Chain guide bar.
Guide bar (10) is exposed to heavy wear especially in tip and bottom part. To prevent side
wear due to friction, it is recommended to turn over the guide bar every time the chain is
sharpened. Clean the guide bar groove and oil holes on that occasion. Guide bar groove is
rectangular. Check the groove against wear. Put rule to guiding strip and outer surface of a
chain tooth. If you observe distance between, the groove is correct. Otherwise the guide bar is
worn out and needs to be replaced.
4.6. Chain wheel.
Driving chain wheel is subject to especially heavy wear. Replace the chain wheel when you
observe clear signs of wear of wheel teeth. Worn chain wheel additionally reduces durability of
chain. Chain wheel should be replaced by authorized service workshop.
4.7. Chain brake.
The saw features automatic brake, which stops the chain in case of recoil during chain
saw operation. The brake engages automatically when force of inertia is applied to a weight
located inside the brake casing. The chain brake can also be switched on manually, when the
brake lever (2) is moved towards the guide bar (10). Switching the chain brake stops the chain
movement in 0.12 sec.
4.8. Braking check.
Ensure the brake operates correctly before each use of the saw.
Put operating saw on the ground and open the throttle fully for 1 - 2 seconds to allow the
saw engine to operate at its maximum speed.
Push the brake lever (2) forward. The chain should stop immediately.
In case the chain stops slowly or does not stop at all, replace the brake band and clutch
drum before using the chain saw again.
To release the brake, pull the brake lever (2) towards the main handle (4) so you can hear
sound typical of blockade snapping.
Ensure the chain brake operates correctly and the chain is sharp. It is very important for
keeping potential recoil at a safe level.
In case the brake does not operate efficiently, adjust it or repair in authorized service site.
In case the engine operates at high speed with the chain brake switched on, the saw clutch
will overheat. When the chain brake engages during operation of the engine, release the throttle
lever immediately and keep engine speed at low level.
4.9. Chain tension adjustment.
Cutting chain tends to lengthen during operation due to higher temperature. Longer chain
loosens and may slip off the guide bar.
Loosen the guide bar fixing nuts (7).
Ensure the chain (11) remains in the guiding groove of the guide bar (10).
Use a screwdriver to turn the chain tension adjustment screw clockwise, until the chain is
strained appropriately (it should slightly hold the guide bar in horizontal position).
Check the chain tension again (it should be possible to lift the chain by approximately 3 - 4
mm in the middle of the guide bar).
Tighten firmly the guide bar fixing nuts (7).
Do not over-tension the chain. Adjustment of overly heated chain may lead to excessive
tension when cooling down.
4.10. Operating the chain saw.
Before starting any planned task, familiarize yourself with section describing safe rules for
chain saw operation. It is recommended to gain experience by cutting waste wood pieces. It
will also allow to find out the chain saw possibilities.
