Zenoah GZ381 Manuel D'utilisation page 30

Correctly adjusted carburettor
When the carburettor is correctly adjusted the product
accelerates without hesitation and 4-cycles a little at full
throttle. It is also important that the saw chain does not
rotate at idle. If the L-jet is set too lean it may cause
starting difficulties and poor acceleration. If the H-jet is
set too lean the product will have less power, poor
acceleration and could suffer damage to the engine.
Maintenance and checks of the safety
devices on the product
To do a check of the brake band
1. Brush off any wood dust, resin and dirt from the
chain brake and clutch drum. Dirt and wear can
impair operation of the brake. (Fig. 86)
2. Do a check of the brake band. The brake band must
be at least 0,6 mm (0.024 inch) thick at its thinnest
point.
To do a check of the front hand guard
Regularly carry out a check of the front hand guard and
the inertia brake release.
1. Do a visible check to make sure the front hand guard
is not damaged and that there are no visible defects
such as cracks.
2. Move the front hand guard forwards and backwards
to make sure it moves freely and that it is securely
anchored to the clutch cover.
3. Place the chainsaw, with the engine switched off, on
a stump or other stable surface.
4. Release the front handle and let the chainsaw fall by
its own weight, rotating around the rear handle
towards the stump. (Fig. 87)
5. Make sure that the chain brake activates as the
guide bar hits the stump. (Fig. 88)
To do a check of the chain brake
1. Start the product. Refer to
page 24 for instructions.
WARNING:
chain does not touch the ground or other
objects.
2. Hold the product tightly.
3. Apply full throttle and tilt your left wrist against the
front hand guard to engage the chain brake. The
saw chain must stop immediately. (Fig. 89)
WARNING:
handle.
30
To start the product on
Make sure that the saw
Do not let go of the front
To do a check of the throttle trigger and
throttle trigger lockout
1. Make sure that the throttle trigger and throttle trigger
lockout move freely and that the return spring works
correctly. (Fig. 90)
2. Press down the throttle trigger lockout and make
sure that it goes back to its initial position when you
release it. (Fig. 91)
3. Make sure that the throttle trigger is locked at the
idle position when the throttle trigger lockout is
released. (Fig. 92)
4. Start the product and apply full throttle.
5. Release the throttle trigger and make sure that the
saw chain stops and stays stationary.
WARNING:
when the throttle trigger is in the idle
position, speak to your servicing dealer.
To do a check of the chain catcher
1. Do a visible check and make sure that there is no
damage on the chain catcher.
2. Make sure that the chain catcher is firmly attached to
the body of the chainsaw. (Fig. 93)
To do a check of the right hand guard
• Make sure that the right hand guard is not damaged
and that there are no defects, such as cracks. (Fig.
28)
To do a check of the vibration damping
system
1. Make sure that there are no cracks or deformation
on the vibration damping units.
2. Make sure that the vibration damping units are
correctly attached to the engine unit and handle unit.
Product overview on page 17 for information
Refer to
about where the vibration damping system is on your
product.
To do a check of the start/stop switch
1. Start the engine.
2. Press the start/stop switch downwards to the STOP
position. Make sure that the engine stops when you
do this. (Fig. 29)
WARNING:
automatically returns to run position. In order
to prevent unintentional starting, the spark
plug cap must be removed from the spark
plug when assembling, checking and/or
performing maintenance.
If the saw chain rotates
The start/stop switch
272 - 009 - 21.06.2021