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WARNING! Do NOT disable ground prong. Removing
or bypassing the ground prong on a plug eliminates
the ground connection. Always plug the pump into an
approved grounded electrical outlet for safe operation.
CAUTION! All pumps should operate at the rated
nameplate voltage. AC power should be supplied to
the pump from a dedicated circuit with 15 amp circuit
protection. No other equipment should be powered
by this circuit. Wiring must be of sufficient size to carry
the correct current for the pump (minimum 12 gauge).
Voltage drop will vary with distance to pump and size of
wire; refer to the National Electrical Code (NEC), or local
codes, for voltage drop compensation to be sure you are
using the correct size wire for your application.
AC Only
• 115VAC, 60Hz, 2.5 Amps, 1/4 Hp (185 watts) motor, std.
• 115VAC, 60Hz, 2.5 Amps, 1/4 Hp (185 watts) motor,
Explosion Proof UL Listed
A. All wiring must be done by a licensed electrician in
accordance with approved electrical codes.
B. Power must be supplied by a licensed electrician in
accordance with approved electrical codes.
C. Circuit must be grounded.
D. Power cable must be protected from sharp edges.
Best Practices
Regular maintenance is critical to maintaing performance and
extending the life of your 400 series pump.
WARNING! Always switch pump off and disconnect
from power source prior to servicing!
WARNING! Always flush pump completely prior to any
service or disassembly. Use water, or an appropriate
flushing fluid for the fluids being pumped. DO NOT USE
PRESSURIZED WATER OR PRESSURIZED AIR to flush
your Sotera Systems pumps. Damage to the equipment
will occur if flush water pressure exceeds 15 psi (1 bar).
Instead, submerge the suction tube or inlet adapter in
clean water and dispense water by operating the pump.
Dispose of the flush water properly. After flushing, pump
air to remove as much water as possible.
WARNING! DO NOT disassemble the yoke assembly. It
is under extreme pressure, and serious injury or death
may result!
Ground Prong
3
IMPORTANT! Do not allow chemicals to remain in the
pump for any extended period of time, whereby the
chemicals area allowed to "dry out." Thoroughly rinse
pump and meter by flushing the pump with water or
appropriate flushing fluid.
IMPORTANT! The pump body is filled with oil at the
factory to lubricate the internal gear drive mechanism
for the diaphragms. Certain repair and maintenance
procedures require draining of the oil, while others do
not. If you need to drain the oil, remove one fluid sight
cap (item 30) from the pump body. Stand the pump
on its end and drain the oil via the sight cap port into a
container approved for standard 30W motor oil. Always
use new oil after draining
Routine Annual Maintenance or as needed.
(Reference page 5 for item numbers.)
1. Tighten all external torx head screws to 75 in. lbs.
(items 9 & 17).
2. Drain oil through sight caps and replace oil with
approximately 16 ounces of automotive grade SAE 30W
through one of the sight cap holes. The oil level should be
level with the bottom edge of the sight caps (item 3)
located on the front of the pump body.
NOTE: Always check oil level when the pump is level
NOTE: If external torx head screws (items 9 & 17) are removed,
hand start and tighten to 75 in. lbs. Tighten motor flange hex
head screws to 50 in lbs.
Diaphragm Assembly/Check Valve Replacement
IMPORTANT! Diaphragms and check valve assemblies
can be serviced without removing oil from pump body by
servicing one side at a time with diaphragm facing up. It
is important during this procedure to make sure no debris
or contaminants fall into the oil.
1. Remove 8 diaphragm cover screws (Torx T30) and
diaphragm cover (item 9).
2. Remove retainer screws (item 26) and o-rings (item 25)
(Phillips Head #2)
CAUTION! USE CARE in removing the diaphragm and
check valve assemblies from the pump body 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.
3. Remove diaphragm assembly by pulling check valves out
of pump body; be careful not to damage surface of body.
4. Install new diaphragm assembly in the same orientation
as the one that was removed.
5. Insert four screws (item 26) and o-rings (item 25) into
diaphragm as shown and tighten to 35 in. lbs. of torque.
6. Install diaphragm cover (item 28). Hand start and tighten
torx head screws to 75 in. lbs.
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