Swing Piston Pumps NPK 25
Servicing
Translation of original Operating and Installation Instructions, english, KNF 121581-121584 08/16
15
5.
Slide “piston assembly” (consisting of retainer plate (
9
), piston
seal (
10
), and countersunk screw (
7
) with O-ring (
8
)) into the
cylinder (
13
) from the top and place on connecting rod (
14
).
The piston seal must not be distorted during assembly. It must
make contact with the cylinder all round its circumference
6.
Fasten the “piston assembly” by tightening the countersunk
screw (
7
) (maximum tightening torque: 6.5 Nm).
7. Lay the two new O-rings (
5
) on intermediate plate (
6
).
8. Place the intermediate plate (
6
) on the pump housing in ac-
cordance with the felt-tip pen marking.
9. Place valve plate (
4
) on intermediate plate (
6
).
To align the valve plate, refer to fig. 5 and a groove in the
intermediate plate and valve plate: The two grooves must lie
on top of each other.
10. Insert the two new O-rings (
3
) into the underside of head plate
(
2
).
11. Place head plate (
2
) on intermediate plate (
6
).
Head plate and intermediate plate have a notch each which
must lay one upon the other.
12. Tighten the screws (
1
) at first lightly, then firmly by hand, in a
diagonal pattern (max. tightening torque 6.5 Nm).
Final step
1. Refit front fan cover.
