Swing Piston Pumps NPK 25
Servicing
Translation of original Operating and Installation Instructions, english, KNF 121581-121584 08/16
13
8. Servicing
8.1. Servicing schedule
Component
Servicing interval
Pump
-
Regular inspection for external dam-
age or leaks
Piston seal and
valve plate
-
Replace at the latest, when pump
output decreases
Tab. 8
8.2. Cleaning
Only use solvents for cleaning if the head materials cannot be
attacked (check the resistance of the material).
If compressed air is available, blow out the components.
8.3. Replacing piston seal and valve plate
Motor disconnected from mains and de-energized
Pump free of dangerous substances
Always replace the piston seal and valve plate together to
maintain the pump performance.
Spare part*
Position**
Quantity
Piston seal
(9)
1
Valve plate
(4)
1
Countersunk screw
(7)
1
O-ring D 32 x 2.0
(3), (5)
4
O-ring D 8.0 x 1.0
(8)
1
O-ring D 50 x 2.0
(12)
1
* According to spare parts list, chapter 10
** According to Fig. 5.
Tab. 9
Quantity Tools/Material
1
Phillips screwdriver No. 1 (only for pump NPK 25 DC)
1
Phillips screwdriver No. 2
1
Screwdriver blade width 5.5 mm
1
Allen key 4 mm
1
Felt-tip pen
Tab. 10
Conditions
Information on procedure
Spare parts
Tools and material
