Heidolph Vacuum Switchbox - Manual (Page 63)

63
E
Loosen 4 ea. machine hex-recessed bolts on pump heads
and lift off upper half (lid with internal part)
¾
Never attempt to loosen parts with sharp tools
(screwdriver), use rubber hammer or compressed air
instead.
To inspect valves carefully detach lid from internal part;
denote location of valves and remove valves.
¾
Replace damaged valves.
Remove contamination with cleaning agent.
Inspect diaphragm for damage, replace on condition. To
this end remove data plate with 4 ea. Phillips screws.
Explosion drawing: pump head
diaphragm
diaphragm cocking spring with
square-head bolt
cover
valve
lid
lid, inside
housing
piston rod
diaphragm back-
up ring