Care And Maintenance; Changing The Filter Element - Hilti VC 20‑U Manual Original

8 Care and maintenance

8.1 Automatic filter element cleaning
NOTE
Do not attempt to clean the filter element by
knocking it against a hard object and do not
use pointed instruments. This will reduce the
life of the filter element.
NOTE
Do not use compressed air to clean the fil-
ter element. This may cause tears in the filter
material.
NOTE
The condition of the filter will deteriorate with
use. It should be replaced at least every 6
months and more frequently if the appliance is
subject to heavy use.
The appliance is equipped with a filter clean-
ing system which removes most of the dust
adhering to the filter element.
The filter element is cleaned automatically by a
blast of air (a pulsating noise is heard).
NOTE
The filter element cleaning system functions
only when a suction hose is connected.

8.2 Changing the filter element

CAUTION
Never use the appliance without a filter ele-
ment.
8.2.1 Removing the filter element 6
1. Disconnect the supply cord plug from the
power outlet.
2. Open the filter cover catches.
3. Open the filter cover.
4. Carefully remove the filter element, grip-
ping it at the areas provided in the holder.
8.2.2 Fitting the filter element 7
1. Clean the filter sealing surfaces.
2. Fit the new filter element.
3. Close the filter cover by pivoting the cover
catch forward.
4. Close the filter cover catches.
8.3 Opening the appliance for checking
1. Engage the castor brakes.
2. Disconnect the supply cord plug from the
power outlet.
3. Open the two catches.
4. Lift the vacuum cleaner top section away
from the waste material container and
place it on a level surface.
8.4 Checking the waste material level
Check that the cut-out contacts are free from
dirt and dust and clean them if necessary.
8.5 Closing the appliance
CAUTION
When fitting the top section of the vacuum
cleaner, take care to avoid pinching your
fingers or damaging the supply cord.
1. Fit the vacuum cleaner top section onto
the waste material container.
2. Close the two catches.
8.6 Care of the appliance
CAUTION
Disconnect the supply cord plug from the
power outlet.
Never operate the appliance when the venti-
lation slots are blocked. Clean the ventilation
slots carefully using a dry brush. Clean the out-
side of the appliance at regular intervals with a
cloth. Do not use a spray, high-pressure water-
jet system, steam pressure cleaning equipment
or running water for cleaning. This may nega-
tively affect the electrical safety of the appli-
ance. Always keep the grip surfaces of the
appliance free from oil and grease. Do not use
cleaning agents which contain silicone.
The appliance must be handled for cleaning
and maintenance in a way that avoids expos-
ing maintenance personnel and other persons
to any hazards. Use filtered forced ventilation.
Wear personal protective equipment. Clean the
maintenance area in a way that prevents haz-
ardous substances escaping into the surround-
ing environment.
Vacuum off the outer surfaces of the appliance,
wipe it clean or seal it in suitable container
or material before removing it from an area
contaminated with hazardous substances. This
en
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