KNF SC 920G - Page 36

Servicing Vacuum Pump System SC 920G
36 Translation of original Operating Instructions, English, KNF 121308-121311 07/18
Fig. 16: Pump (exploded drawing, symbolic)
Change diaphragms
1. Turn the diaphragms (15) (2 pieces) and (22) (1 piece)
outwards with your hands, counterclockwise. For this, turn the
fan (19) such that you can easily grip each diaphragm with
your hands.
For diaphragms (15):
Make sure the diaphragm spacers being between diaphragm
and c
onnecting rod (21) do not fall into the pump housing.
If diaphragm spacers should adhere to the diaphragms, ta
ke
them off and put
them on the thread of the corresponding
c
onnecting rod.
In order to ensure the pneumatic output of the pump, it is
essentia
l that the diaphragm washers are subsequently
remounted in the same quantity in each case.
2. Screw the new diaphragms (15) (2 pieces) and (22) (1 piece)
onto the connecting rods (20) and (21) and tighten it by hand.
Before you finally tighten the diaphragm, you are
reco
mmended to move the diaphragm to the upper dead
center by rotating the fan
(19).
3. Put head plate (9) with intermediate plates (10), (13) and (14)
on adapter (16).