Husqvarna W21 Operator's Manual page 25

Set throttle control to high speed.
Engage Operator Presence Control (OPC).
Engage Blade Brake Control (BBC).
Engage Ground Speed Bail to begin mowing.
TIP: To extend clutch life do not engage BBC and
start blade while in tall grass. Start the blade in short
cut grass or over a hard level surface. Allow the
blade to come up to speed (1-2 seconds) before
mowing grass.
OPERATION
Set Throttle to High Speed
Engage OPC then BBC
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