9
(6) When one of the diaphragms is pushed downwards (to
bottom dead center), the other diaphragm moves upwards (to
top dead center). The edge of the diaphragm may then be held
with the fingers (Photo.6).
(7) While holding the edge of the diaphragm, turn it in the anti-clockwise
direction to remove it (Photo.7). Remove the remaining diaphragm in the same
way.
Caution: Use two persons if the diaphragm is difficult to remove.
Caution: A spacer (washer) is located between the diaphragm and the
connecting rod. Ensure that this spacer does not drop into the pump
(Photo.8).
Caution: The connecting rod may fall into the pump.
After removing the diaphragms, it is convenient to insert the pump
head cover hexagon socket head cap screw (M6 x 25) into the
threaded hole in the connecting rod.
(8) Remove any foreign matter from the threaded hole in the connecting rod by wiping with solvent.
(9) Apply a small amount of vacuum grease to the
spacer and threaded portion of the new diaphragm,
and fit by rotating in the clockwise direction (Photo.9).
Caution: Check that the peripheral liner is in
place (Photo.8). Ensure that the spacer
removed in (7) is fitted.
Caution: To prevent wrinkling of the PTFE
sheet, fit the diaphragm while holding it
firmly as shown in Photo.9.
(10) Fit the other diaphragm in the same manner.
Diaphragm
Bottom dead
center
Top dead
center
Photo.6
Photo.7
Spacer
Connecting rod
Peripheral liner
Photo.8
Edges curled up
○
Almost flat
×
Photo.9