Servicing
Swing Piston Pumps NPK 09
6
5. Servicing
Before working on the pump, isolate the power supply
securely, then check that the lines are not live.
The piston seal, and to a lesser extent the valve plates are the only
parts of the pump subject to wear. They are simple to change.
When changing the piston seal, check the valve plates for damage
(tongues bent, corrosion).
The position numbers in the following text refer to figs. 3 to 6.
Fig. 3:
Pump element (single head types)
Fig. 4:
Pump element (twin head types)
Fig. 5:
Pump element (all types)
Fig. 6:
Pump head (all types)
Specifiaction
Pos. Description
1
Housing
2
Intermediate plate
3
Ribbed head
4
Screw
5
Connection
(only twin head
models)
6
Gasket
7
Valve Plate
8
Valve Plate
9
O-Ring
10
Cylinder
11
Retainer Plate
12
Support
13
Piston seal
14
Screw
15
Washer(s)
16
Connecting rod
17
Counter weight
18
Cover
M
Mark
K
Compression
symbol
