Checking The Chain Tension; Retightening The Saw Chain; Chain Brake; Engaging The Chain Brake - Makita DCS510 Owner's And Safety Manual

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Checking the chain tension

The tension of the chain is correct if the chain rests against the
bottom side of the guide bar and can still be easily turned by
hand.
While doing so the chain brake must be released.
Check the chain tension frequently - new chains tend to get
longer during use!
When checking the chain tension the engine must be switched
off.
NOTE:
It is recommended to use 2-3 chains alternatively.
In order to guarantee uniform wear of the guide bar the bar
should be turned over whenever replacing the chain.

Retightening the saw chain

Loosen the nuts (2) about one turn with the universal
wrench. Raise the tip of the guide bar a little and turn the chain
tensioning screw (4) to the right (clockwise) until the saw chain
is again up against the bottom edge of the guide bar (see
circle).
While keeping the tip of the guide bar raised, tighten the nuts
(2) again with the universal wrench.

Chain brake

The DCS460 / DCS510 comes with an inertia chain brake as
standard equipment. If kickback occurs due to contact of the
guide-bar tip with wood (see SAFETY PRECAUTIONS, page
10), the chain brake will stop the chain through inertia if the
kickback is sufficiently strong.
The chain will stop within a fraction of a second.
The chain brake is installed to block the saw chain before
starting it and to stop it immediately in case of an emergen-
cy.
IMPORTANT: NEVER run the saw with the chain brake
activated (except for testing, see "Testing chain brake")!
Doing so can very quickly cause extensive engine dama-
ge!
ALWAYS release the chain brake
before starting the work!
Engaging the chain brake (braking)
If the kickback is strong enough the sudden acceleration of the
guide bar combined with the inertia of the hand guard (1) will
automatically actuate the chain brake.
To engage the chain brake manually, simply push the hand
guard (1) forward (towards the tip of the saw) with your left
hand (arrow 1).
Releasing the chain brake
Pull the hand guard (1) towards you (arrow 2) until you feel it
catch. The brake is now released.
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