Inspection And Servicing - Graf DN 400 Notice D'installation Et D'entretien

6.5.2 Telescopic domeshaft suitable for vehicle loading
(class B)
If the shaft is installed under areas used by passenger cars,
the collar area of the telescope
be supported with concrete
The concrete layer to be poured around the telescope must
be at least 300 mm wide and approx. 200 mm high all round
so that the load forces can in no case be transmitted to the

shaft housing .
Attention: It is imperative to use the cast cover class B.
6.5.3 Telescopic dome shaft cover suitable for truck
traffic (class D)
In the case of installation under areas subject to truck traffic,

the telescope (colour: anthracite) is lined as in item 6.5.2
above. The cast frame
to be provided by the customer are subsequently installed for
the load distribution of the cast cover. The cast frame must
have a bearing surface of approx. 1 m², so that the load
forces can in no case be transmitted to the shaft housing
Attention: It is imperative to use the cast cover class D.
The entire system must be checked for leaks, cleanliness and stability at least every three months.The
entire system should be serviced at intervals of approx. 5 years. In this case, all parts of the system must
be cleaned and their function checked.
Servicing should be carried out as follows:

Remove solid residues with a soft spatula

Clean surfaces and built-in parts with water

Remove all dirt completely from the shaft or filter basket

Check that all internal parts are firmly seated
Attention: The outlet must be checked and flushed if necessary at each service!
6. Installation and assembly

(colour anthracite) must

(load class B25 = 250 kg/m²).

supplied or the concrete rings

7. Inspection and servicing

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