Husqvarna 439 Operator's Manual page 30

Checking the inertia brake release
• Place the chain saw, with the engine switched off, on
a stump or other stable surface. Release the front
handle and let the saw fall by its own weight, rotating
around the rear handle towards the stump.
When the bar hits the stump the brake should be
activated.
Checking the brake trigger
• Place the chain saw on firm ground and start it. Make
sure the chain does not touch the ground or any other
object. See the instructions under the heading Start
and stop.
• Grasp the chain saw firmly, wrapping your fingers and
thumbs around the handles.
• Apply full throttle and activate the chain brake by tilting
your left wrist forward onto the front hand guard. Do
not let go of the front handle. The chain should stop
immediately.
30 – English
MAINTENANCE
Throttle lockout
• Make sure the throttle control is locked at the idle
setting when the throttle lockout is released.
• Press the throttle lockout and make sure it returns to
its original position when you release it.
• Check that the throttle trigger and throttle lockout
move freely and that the return springs work properly.
• Start the chain saw and apply full throttle. Release the
throttle control and check that the chain stops and
remains stationary.
Chain catcher
• Check that the chain catcher is not damaged and is
firmly attached to the body of the chain saw.