Echo CS-4910 Operator's Manual page 8

SAFETY CS-4910
ANSI Standard B175.1 and
CSA Z62.1.3 stipulate that the
brake shall stop the chain 0.12
seconds at an engine speed of
13,500 r/min. It is the
responsibility of the owner/
operator to ensure that the
brake is serviced, adjusted
and tested strictly in
accordance with the
instructions as detailed here
in order to ensure that the
brake performance is
maintained in compliance with
the Standards B175.1 and CSA
Z62.1.3
Automatic Chain Brake
When checking the operation of the automatic chain brake, use a soft
surface substance like wood to absorb the impact so the chain is not
damaged.
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