KNF LAB LABOPORT SH820G Manual Del Usuario página 125

Vacuum system SH820G / SR820G SH840G / SR840G
Translation of Originial Operating Instruction, KNF 325562-325564 06/21
4. Loosen the internal cap screw (1) on both pump heads.
5. Remove the two pressure plates (2) together with the two
internal cap screws (1).
6. Unscrew the gas ballast (9/Fig. 14) from the head cover
(3).
7. Replace the O-ring (13) on the gas ballast (9/Fig. 14).
8. Screw the gas ballast (9/Fig. 14) into the corresponding
head cover (3) as far as it will go. Then turn it back again
until the surface is oriented upwards.
9. Dispose of the replaced O-rings properly.
Replacing valve plates/seals
On the pump, the valve plates/seals (4) are replaced one
after the other.
1. Remove the head cover (3) from the intermediate plate
(6).
2. Remove the old valve plates/seals (4).
3. Carefully clean the intermediate plate (6) (if there are de-
posits on it).
4. Insert the new valve plates/seals (4) into the correspond-
ing seats on the intermediate plate (6).
5. Perform steps 1 – 4 for the second pump head.
6. Dispose of the replaced valve plates/seals (4) properly.
7. Insert the connection tube (10/Fig. 14) back into the head
cover (3).
Fit pump head
1. Move the diaphragms (7) to the center position.
2. Press down on the edge of both diaphragms (7) all the
way around.
3. Place the head cover (3) on the intermediate plate (6) in
line with the locating pin (5).
4. Place the pressure plate (2) on the head cover (3) accord-
ing to the pencil line.
5. Perform steps 3 and 4 for the second pump head.
Servicing
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