Servicing
Diaphragm Vacuum Pump N 828 / N 838
46
Translation of original Operating and Installation Instructions, english, KNF 121249-121517 09/19
9. Join the head plate (
3
) and the intermediate plate (
2
) by tight-
ening the two screws (
9
) with disk spring (
11
) and washer (
12
).
For orientation of disk spring (see Fig. 30).
Torque for tightening the screw(s): 25 Ncm.
10. Install the screw cap(s) (
10
).
e.) Refit pump head
1. Turn the fan to bring the diaphragm (
8
) to top dead centre.
2. Place the pump head (consisting of intermediate plate (
2
) with
valve plates/sealings (
6
), and head plate (
3
) on the housing, in
the position indicated by the marking (
M
).
3. Gently tighten the screws (
4
), evenly and diagonally.
4. Turn the fan to check that the pump rotates freely.
5. Turn the fan again to bring the diaphragm to top dead centre.
6. Now tighten screws (
4
) firmly (torque: 3.5 Nm).
f.) Final steps
1. Only in the case of DC versions (no cooling fan): refix the cov-
er (
5
).
2. Connect the pump to the electrical supply.
If you have any questions about servicing call our technical adviser
(contact data: see www.knf.com).
