Mini Laboratory pumps N 86.18, N 811.18
Servicing
Translation of original Operating Instructions, English, KNF 121435-121438 04/18
21
Change diaphragm
1.
Using a small screwdriver, between the housing (
1
) and the
outer edge of the diaphragm (
8
), carefully lever the edge of the
diaphragm lightly upwards
2.
Grip the diaphragm (
8
) on opposite sides, unscrew it about two
turns (anti-clockwise).
3.
Hold the pump with one hand, so that the head is pointing
downwards. Turn the diaphragm (
8
) anti-clockwise to unscrew
it.
4.
Take the diaphragm support (
9
) and diaphragm spacer(s) (
10
)
off the threaded portion of the diaphragm (
8
) and retain them.
5.
Check that all parts are free from dirt and clean them if neces-
sary (see chapter 6. Cleaning).
6.
Put the diaphragm support (
9
) and diaphragm spacer(s) (
10
),
in that order, on the threaded portion of the new diaphragm (
8
).
7.
Screw the new diaphragm (
8
) complete with diaphragm sup-
port (
9
) and diaphragm spacer(s) (
10
) into the connecting rod
(clockwise) and tighten it by hand.
Changing the valve plates/sealings
1.
Remove the valve plates/sealings (
7
) from the intermediate
plate (
2
)
2.
Check that the valve seats, intermediate plate (
2
) and head
plate (fig. 7/
3
) are clean. If scratches or distortion are evident
on these parts they should be replaced.
3.
Lay the new valve plates/sealings (
7
) in the recesses in the
intermediate plate (
2
). The valve plates/sealings for suction
and pressure sides are identical, as are upper and lower sides
of the valve plates/sealings.
4.
Check that the valve plates/sealings (
7
) are not deformed by
moving them gently sideways in their recesses.
5.
Dispose of the old diaphragm and valve plates/sealings
properly.
Refitting pump head
1.
Place the intermediate plate (
2
) with valve plates/sealings (
7
)
on housing (
1
) in the position indicated by the drawing line.
2.
Place the head plate (fig. 7/
3
) with cover (fig. 7/
5
) on the inter-
mediate plate (
2
) in the position indicated by the drawing line.
3.
Check that the head plate (fig. 7/
3
) is centred by moving it
gently sideways.
4.
Tighten the screws (
4
), evenly and diagonally, first gently, then
firmly.
Fig. 8 Pump head
DE
EN
FR
ES
IT
Summary of Contents for Laboport N811 KN.18
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