Maintenance And Servicing; Maintenance Performed By The User; Diaphragm Replacement - Welch 2019C-02 Operation Manual

Maintenance and Servicing

6 Maintenance and Servicing
Diaphragm Pumps are 100% oil-free.
All bearings are sealed and permanently lubricated.
6.1

Maintenance Performed by the User

Only perform the work that is described here, and that which is permitted to be done
by the user.
All other maintenance and service work may only be performed by the manufacturer
or a dealer authorized by him.
Beware of the pump parts being possibly contaminated by hazardous substances.
Wear protective clothing if there is contamination.
Renew defective parts, if necessary! Do not clean with compressed air!
Check the pump daily for unusual running noises and heat building up on the surface of
the pump.
Check the electrical and vacuum connections daily.
6.1.1

Diaphragm replacement

Disassembling the diaphragms:
Disconnect power.
Note: Observe the position of
the air intake port (B) and exhaust
port (A) before disassembly.
Remove the six screws from head
(with handle) and place the head
with the screws aside.
Remove the four screws from
valve plate and remove them.
Now remove the diaphragm with
the PTFE diaphragm liner and
discard it.
Reassembling the diaphragms:
Wipe top of connecting rod clean
with a soft clean cloth.
Place new diaphragm with PTFE-
diaphragm liner on top of connect-
ing rod. Line up the holes in the
diaphragm and liner with the
screw holes in connecting rod.
Screw the four screws crosswise
with a torque of 3 - 4 Nm.
14
WARNING !
2019