Husqvarna 326E X-series Operator's Manual page 10

GENERAL SAFETY PRECAUTIONS
Locking nut
The locking nut secures the cutting attachment on the
output shaft.
Protect your hand from injury when assembling, use the
blade guard as protection when tightening with a socket
spanner.
When fitting, tighten the nut in the opposite direction to the
direction of rotation of the cutting attachment. To remove
it, undo the nut in the same direction as the cutting
attachment rotates. (CAUTION! The nut has a left-hand
thread.)
Tighten the nut using the socket spanner. 35-50 Nm (3.5-
5 kpm).
The nylon lining inside the locking nut must not be so worn
that you can turn it by hand. The lining should offer a
resistance of at least 1.5 Nm. The nut should be replaced
after it has been put on approx. 10 times.
10 – English 1153255-95 Rev.1 2010-02-02