KNF LAB LABOPORT SH820G Manual Del Usuario página 124

Servicing
Cap screw
1
Pressure
2
plate
3 Head cover
9 Gas ballast
10 Connection
tube
Hose
11
connection
AS
Hose
12
connection
HLK
13 Gas ballast
O-ring
Connection
14
tube O-ring
48
2. Carefully turn the upper diaphragm (7) counterclockwise
by hand and remove it.
Make sure that the shim rings located between the di-
aphragm and connecting rod do not fall into the pump
housing.
Remove any shim rings adhering to the diaphragms and
fit them on the associated connecting rod thread.
The prerequisite for ensuring the pneumatic performance
of the pump is that the same number of shim rings be
mounted as before.
3. Screw in the new diaphragm (7) by hand and tighten it by
hand. Be certain to tighten it securely.
4. Perform steps 1 – 3 for the second pump head.
5. Dispose of the replaced diaphragms (7) properly.
Change O-rings
12
Fig.14: Change O-rings
1. Pull the two pump heads apart.
2. Pull the connection tube (10/Fig. 14) out of the head cover
(3).
The two hose connections (11) and (12) remain mounted
in the head covers.
3. Replace the two O-rings (14) on the interconnection tube
(10/Fig. 14).
Translation of Originial Operating Instruction, KNF 325562-325564 06/21
Vacuum system SH820G / SR820G SH840G / SR840G
10 11
1
14
9
13
3 2