10
(5) Withdraw the connecting tube from the valve retainer, and disassemble the left and right
pump heads. See Photo 5.
Photo 8
Photo 9
Photo 10
(6) When one diaphragm is pushed downwards (to bottom dead center), the other
diaphragm rises (to top dead center). It is then possible to grip the edge of the
diaphragm. See Photo 8.
(7)
While holding the edge of the diaphragm, turn it in the anti-clockwise direction and
remove it. See Photo9. Remove the other diaphragm in the same way.
Note: Use two persons to grip the diaphragm if it is difficult to remove.
Note: A spacer (washer) is inserted between the diaphragm and connecting rod. Ensure
that this spacer does not fall into the pump. See Photo10.
Note: The connecting rod may drop into the pump.
After removing the diaphragm, insert a hex head bolt (M6x25) into the tapped
portion of the connecting rod to hold the pump head cover in place.
(8) Clean the tapped portion of the connecting rod by wiping with a cloth impregnated with
solvent.
(9) Apply a small amount of vacuum
grease to the threads on the new
diaphragm, and to the spacer, and
screw it onto the connecting rod
clockwise. See Photo 11.
Note: Check that the spacer
（
see
Photo 10
）
removed in (7) is returned
to its original position.
Photo11
Note: To prevent wrinkles in the PTFE sheet, hold the diaphragm and fit it firmly as
shown in Photo 11
(10) Fit the other diaphragm in the same way.
Photo 12
Photo 13
(11) Apply a small amount of vacuum grease over a distance of 5mm at both ends of the
connecting tube, and place the tube fully over the nipples to connect the two pump head
covers. See Photo 12.
(12) Place the connected pump heads over the casing, and bolt in place with hex socket
head bolts (M6x25).
Note: Ensure that the pump heads are in the correct orientation. See Photo 13.
Diaphragm
Bottom dead center
Top dead
center
×
Bad
Edges up
○
Good
Almost flat
Spacer
Connecting rod
Hex socket head
bolts
(M6x25)
Fan
Switch
