Heidolph Vacuum Switchbox - Manual (Page 68)

68
E
Install pump heads
¾
Correct location of the square-head screw of the
cocking disc in the slot of the back-up disc is of
importance.
Screw diaphragm, cocking disc and back-up ring with
piston rod.
¾
Insert shims between back-up ring and piston rod as
required.
Locate diaphragms in a central and plain position on the
housings cut-out.
Lay down pump and support as required.
Install cover and valves.
¾
Check for proper location (refer to fig.)