Husqvarna 420 EL Operator's Manual page 94

The following is a list of the maintenance steps that you
must do on the product. See
information.
Maintenance
Clean the external parts of the product.
Make sure that the power trigger and the power trigger lockout function correctly
from a safety point of view.
Clean the chain brake and make sure that it operates safely. Make sure that the
chain catcher is not damaged. Replace it if necessary.
Turn the guide bar for more equal wear. Make sure that the lubrication hole in
the guide bar is not clogged. Clean the bar groove.
Make sure that the cutter and cutter guard have no cracks and that they are not
damaged. Replace the cutter or cutter guard if they have cracks or if they have
been exposed to impact.
Make sure that the guide bar and saw chain have sufficient oil.
Do a check of the saw chain. Look for cracks and make sure that the saw chain
is not rigid or unusually worn. Replace if necessary.
Sharpen the saw chain. Do a check of its tension and condition. Do a check for
wear on the drive sprocket and replace is necessary.
Clean the air inlet on the product.
Make sure that the screws and nuts are tight.
Use a file to remove burrs from the edges of the guide bar.
Empty and clean the oil tank.
Blow through the product gently with compressed air.
Maintenance and checks of the safety
devices on the product
To do a check of the front hand guard
Regularly do a check of the front hand guard and the
inertia brake release.
1. Make sure that the front hand guard is not damaged
and that there are no defects, such as cracks. (Fig.
81)
2. Make sure that the front hand guard moves freely
and that it is attached safely to the product. (Fig. 82)
3. Put the product, with the motor off, on a stump or
other stable surface.
4. Hold the rear handle and let go of the front handle.
Let the product fall against the stump. (Fig. 83)
5. Make sure that the chain brake engages as the
guide bar hits the stump.
To do a check of the brake trigger
1. Put the product on stable ground and start it. See
start the product on page 90 .
94
Safety on page 85 for more
WARNING:
chain does not touch the ground or other
objects.
2. Wrap your fingers and thumbs around the handles
and hold the product tight. (Fig. 84)
3. Apply full power and tilt your left wrist against the
front hand guard to engage the chain brake. The
saw chain must stop immediately. (Fig. 85)
WARNING:
handle!
To do a check of the power trigger lockout
1. Make sure that the power trigger and power trigger
lockout move freely and that the return spring works
correctly. (Fig. 86)
2. Press down the power trigger lockout and make
sure that it goes back to its initial position when you
release it. (Fig. 87)
To
Before
Weekly Monthly
use
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Make sure that the saw
Do not let go of the front
1782 - 003 - 04.04.2022
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