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☞
Check diaphragm (F) for damage and re-
place if necessary.
➨
Lift diaphragm carefully sidewise.
☞
Never use a pointed or sharp-edged tool to
lift the diaphragm.
➨
Use the diaphragm key to grip the diaphragm
support disc (E) below the diaphragm.
➨
Unscrew diaphragm support disc (E) with diaphragm (F) and dia-
phragm clamping disc (G).
F
G
➨
Position new diaphragm (F) between dia-
phragm clamping disc with square head
screw (G) and diaphragm support disc (E).
☞
Note: Position diaphragm with pale side
towards diaphragm clamping disc (facing
pump chamber).
☞
Make sure that the square head screw of the diaphragm clamping disc
is correctly seated in the guide hole of the diaphragm support disc.
➨
Lift the diaphragm at the side. Place the diaphragm carefully together
with diaphragm clamping disc and diaphragm support disc in the dia-
phragm key.
☞
Avoid damage of the diaphragm: Do not excessively bend or crease
the diaphragm.
➨
Check for washers (D) between the diaphragm support disc (E) and
the connecting rod (B). Do not mix the washers from the different pump
heads, since these are set at the factory to ensure proper pump per-
formance. Make sure that the original number is reassembled at the
individual pump head.
☞
Too few washers: The pump will not attain vacuum specification. Too
many washers: Diaphragm clamping disc will hit head cover, causing
noisy operation and possibly causing the pump to seize up.
☞
If the old diaphragm is difficult to separate from the diaphragm support
disc, immerse assembly in naphtha or petroleum ether. Do not inhale
vapors!
G
E
F
