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400B SERIES ELECTRIC DIAPHRAGM PUMPS
Best Operational Practices
egular maintenance is critical to maintaining performance and extending the life of your 400B Series pump.
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• Always turn off the transfer pump and disconnect from a power
source prior to servicing.
• Always flush the pump completely prior to any service or
disassembly. Sotera recommends the use of water for flushing
agricultural and industrial chemicals. For petroleum-based
products such as oils and lubricants, flushing with diesel fuel is
acceptable.
• DO NOT PRESSURIZE THE FLUSHING FLUID. Damage to the
pump will occur. Instead, submerge the suction tube or inlet
adapter in the flushing fluid, then operate the pump as normal for
approximately 15-30 seconds or until the flushing fluid returns to
its initial color. Allow the pump to air dry prior to any service.
• DO NOT SUBMERGE THE ENTIRE PUMP OR ELECTRICAL MOTOR
IN THE FLUSHING FLUID, ONLY THE SUCTION TUBE
OR INLET ADAPTER.
Routine Maintenance Schedule
1. Always check oil level by the sight glass prior to any fluid transfer.
The ideal oil level should be at the mid line or halfway point of
both site glasses. Add SAE 30W oil as needed to maintain the
necessary level.
2. Inspect all external Torx(r) head screws are tight. If any screws
appear to be loose, torque to 75 in-lbs.
Individual Pump Component Removal and Replacement
WARNING
DO NOT DISASSEMBLE EXTERNAL GEAR ASSEMBLY. The planetary gears and ring gear are marked for proper assembly and must not be altered.
Never disassemble yoke assembly. This is under extreme pressure and injury could result.
CAUTION
Use care in removing the diaphragm and check valve assemblies to avoid damage to the pump body. DO NOT pry the diaphragm/check valve
assembly away from the pump body with sharp or metal tools. Scratching or otherwise damaging the pump body may cause leaks.
NOTICE
Do not attempt to replace individual parts. Replace entire assembly when required (Kit 400F6557).
sotera.com
• Do not allow chemicals, lubricants, or oils to remain in the internal
pump cavity for any extended period of time. Crystallization
or a glum could become present, adversely affecting pump
performance.
• Sotera highly recommends flushing the pump after each use to
avoid 'dry out' and contamination between fluid transfers.
• The interior pump cavity is filled with SAE 30W oil by the factory
in order to lubricate the internal gear drive mechanism and yoke
assembly. Certain pump repairs will require the draining of this
fluid. If necessary, remove one of the site caps found on the
exterior of the pump body and drain the oil through this port.
Replace with new SAE 30W oil after repairs are completed through
the same port. Sotera recommends 16 oz of oil to be placed inside
the cavity or until level is halfway within the site glass.
3. Inspect all motor flange hex head bolts are tight. If any bolts
appear to be loose, torque to 50 in-lbs.
4. Either annually or after 500 hours of usage, drain the existing
SAE 30W weight oil through a site glass port and replace with
approximately 16 oz of the same oil.
(refer to exploded pump view, page 13)
OPERATION MANUAL
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