Servicing
Diaphragm Pump UN035_I EX
22
Loosen the four screws G and remove the cover plate H. Turn
the counterweight J so that the connection rod K is in the mid-
position; fit the new diaphragm F.
For double-head pumps:
Undo the three screws that hold the fan cover (not shown) and
remove the fan cover from the motor. Turn the fan (not shown)
to bring the diaphragm F to top dead center; fit the new dia-
phragm F.
7. For all pumps except .9 versions: Place the retainer plate E on
the diaphragm F. If flathead screw D does not have thread-
locker(single-head versions), apply glue Delo
®
-ML 5249 or
equivalent to thread. Tighten the flathead screw D (torque: 5.0
Nm).
8. For pumps UN035_ _.9I EX: Place the retainer plate E on the
diaphragm F. Screw on the retainer plate E with the wrench for
retainer plate uniformly and diagonally (torque: 5.0 Nm).
9. Change lower reed valve:
Undo the cheese head screw U and exchange the reed
valve P; tighten the cheese head screw U.
10. Change upper reed valve:
Loosen the allen screws S, remove the cover plate T and
the gasket V.
Undo the cheese head screw U and exchange the reed
valve P; tighten the cheese head screw U.
Replace the cover plate T with a new gasket V and tighten
the allen screws S.
11. Place the diaphragm head C on the diaphragm F according to
the marks made previously and tighten the screws B uniformly
and diagonally (torque: 10.0 Nm).
12. For single-head pumps:
Turn the counterweight J to check that the pump runs freely,
replace the cover plate H and secure it with the four screws G.
For double-head pumps:
Turn the fan (not shown) to check that the pump runs freely,
reattach the fan cover (not shown) with the three screws.
13. For double-head pumps:
Carry out steps 2 to 12 for the second pump head.
14. For double-head pumps:
Reattach the tube of pneumatic head connection onto the hose
connector and tighten the union nut.
