Swing Piston Pumps NPK 09
Servicing
9
Tab. 4
* According to Spare parts list, section 8
Tools/Material
Philips screwdriver no. 2
Felt-tip pen
Tab. 5
In the case of twin head pumps, both valve plates must always be
changed at the same time. The text below describes the operations
necessary for one head.
To change the valve plates, the following operations of Section
5.1
Changing the piston seal
must be carried out:
Disassembly
1 to 4, 10 and 11.
Assembly
5 to 8 using new valve plates (2 for each head).
For twin head pumps, repeat the operations described for the
second head, and replace the connections between the two heads.
If, after changing the valve plates, the specified vacuum is not
reached, check the following:
pneumatic connections for tightness
for twin head models that the head connections are
gas-tight
If, after changing the valve plates, the pump produces no flow:
check the position and orientation of gasket (
6
), valve plate
(
7
), intermediate plate (
2
) and valve plate (
8
). See fig. 3, 4
and 6.
If you have any questions about servicing call our technical adviser
(see last page for contact telephone number).
Tools required
