Inertia Chain Brake Function - Husqvarna 50 Workshop Manual

Press the front hand guard into position. Install the pivot
sleeves and screw. Pull the hand guard back to
disengage the brake.
Mount the bar, chain and chain brake to the saw. Before
running the saw, check the brake function by moving the
hand guard forward until the brake engages. With the
brake engaged, it should not be possible to rotate the
saw chain around the guide bar. Pull the hand guard
back towards the front handle to disengage the brake.

Inertia Chain Brake Function

The engine must be stopped for the following test.
With the engine stopped, hold the chain saw with both
hands. With the chain saw horizontal, position the bar tip
approx. 35 cm (14 in.) above a tree stump or other firm
object such as a solid wood table.
WARNING !