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400B SERIES ELECTRIC DIAPHRAGM PUMPS
Diaphragm Assembly Replacement
Both the diaphragms and check valve assemblies can be serviced without removing the oil from the interior pump body cavity. It is important that only
one (1) assembly be serviced at a time. Avoid any possible contamination of the oil within the internal pump cavity during this repair.
Procedure
1. Turn the pump on its side by which the diaphragm to be repaired is
facing upward while the opposite diaphragm is facing downward.
2. Remove the eight (8) diaphragm cover screws. This will require a
Torx T30 bit.
3. Remove the cover and turn it over to expose the inner side to avoid
any contamination. The cover will have a gasket seal. It is highly
recommended that this seal be replaced during this repair.
4. Remove the four (4) retainer screws with a Phillips #2 screwdriver.
These screws have a seated O-ring. It is recommended to replace
both the screws and O-ring during this repair.
5. Remove the diaphragm assembly by pulling on the four edge
corners of the diaphragm itself, being careful to not tear or curl
the diaphragm. If necessary, pulling on the check valve assemblies
is acceptable. Do not use any tools to pry the diaphragm off the
pump body as this could damage the surface of the pump. Be sure
to retain the four (4) check balls that are within the cavity of the
pump. These may be removed with the diaphragm.
Motor with Gear Assembly Removal
1. Position the pump with the sight caps downward.
2. Remove the four (4) screws holding this assembly and lift upward.
3. Replace with new motor and gear assembly as supplied by Sotera.
Gear Assembly Removal
1. Remove motor as noted above.
2. Remove six (6) screws and key holding the gear pack assembly on the motor shaft.
3. Replace with new assembly, install new screws, and key.
Internal Mechanical Components
1. Remove motor and gear assembly from pump cavity.
2. Drain oil from interior cavity through this opening.
3. Remove four (4) screws holding bearing plate.
4. Remove bearing plate, allowing for the thrust plate to be
removed as well.
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6. Install new diaphragm assembly in the same orientation as the one
7. Insert the four (4) Phillips head screws and tighten to 35 in-lbs.
8. Install the diaphragm cover with installed gasket. It is important
(Bearing Plate, Yoke, and Drive Shaft Assembly)
5. Remove drive shaft, bearing, bearing ring, and yoke assembly.
6. Assemble in reverse order.
that was removed. Important that the check balls are seated prior to
the diaphragm assembly placement.
to hand start all external screws prior to driving to a torque
specification of 75 in-lbs.
NOTICE
The yoke assembly is under pressure by
two springs. Do not attempt to repair, only
replace with factory authorized parts.
OPERATION MANUAL
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