6
Sewage Pumps
Model: SWH300/SWH500 & SWHD300/SWHD500
Receiving and Installation
It is recommended that the level control float should be
set to insure that the liquid in the sump never drops
below the top of the motor housing. The level control
should have adequate clearance so it cannot hang up in
it’s swing and that the pump is completely submerged
when the level control is in the “Off ” mode. Minimum
tether length is 3.50”.
By adjusting the cord tether the control level can be
changed. DO NOT USE THE POWER CABLE TO LIFT
PUMP.
Pump-Down Test - Be sure pump has been plugged in,
lowered into the basin or sump, check the system by
filling with liquid and allowing the pump to operate
through its pumping cycle. The time needed to
empty the system, or pump-down time along with the
volume of water, should be recorded.
Thermal Protection
Motors are protected by a thermo-overload or thermo
sensor depending on the model and single or three
phase.
Maintenance
Minimal maintenance is required. Perform the following
checks when pump is removed from operation or when
pump performance deteriorates:
a). Inspect motor chambers for oil level and
contamination.
b). Inspect impeller and body for excessive build-up or
clogging.
c). Inspect motor and bearings.
d). Inspect seal for wear or leakage.
Servicing
Cooling Oil
- Anytime the pump is removed from
operation, the cooling oil in the motor housing should be
checked visually for oil level and contamination. To check
oil, set unit upright. Remove pipe plug from housing.
With a flashlight, visually inspect the oil in the housing to
make sure it is clean and clear, light amber in color and
free from suspended particles. Milky white oil indicates
the presence of water. Oil level should be just above the
motor when pump is in vertical position.
Oil Testing
• Drain oil into a clean, dry container by placing pump on
it’s side. Remove pipe plug, from housing.
• Check oil for contamination using an oil tester with a
range to 30 Kilovolts breakdown.
• If oil is found to be clean and uncontaminated
(measuring above 15 KV. breakdown), refill the housing.
• If oil is found to be dirty or contaminated (or measures
below 15 KV. breakdown), the pump must be carefully
inspected for leaks at the shaft seal, cable assembly,
o- ring and pipe plug, before refilling with oil. To locate
the leak, perform the following pressure tests.
After leak is repaired, dispose of old oil properly, and
refill with new oil.
Pressure builds up extremely fast, increase
pressure by “TAPPING” air nozzle. Too much
pressure will damage seal.
DO NOT exceed 10 P.S.I.
Motor Housing Pressure Test:
If oil has been drained, fill to normal level before perform-
ing pressure test. Remove pipe plug from motor housing.
Apply pipe sealant to pressure gauge assembly and tight-
en into hole. Pressurize motor housing to 10 P.S.I. Use
soap solution around the sealed areas above the oil level
and inspect joints for “air bubbles”. For sealed areas
below oil level, leeks will seep oil. If, after five minutes,
the pressure is still holding constant, and no “bubbles” /
oil seepage is observed, slowly bleed the pressure and
remove the gauge assembly. Replace oil. Leak must be
located and repaired if pressure does not hold.
Oil Replacement Motor Housing
Remove pipe plug from motor housing.
Drain all oil (if not already done so) from motor housing
and dispose of properly per Local Code. Set pump
upright and refill with new cooling oil, see “Cooling
Oil” chart. Fill to just above motor (1.2L) as an air space
must remain in the top of the motor housing to compen-
sate for oil expansion. Apply pipe thread compound to
threads of pipe plug then assemble to motor housing.
Check that o-ring is in place and does not need to be
replaced. Reassemble cord cap to motor housing.
DO NOT overfill oil. Overfilling of housing
with oil can create excessive and dangerous
hydraulic pressure which can destroy the
pump and create a hazard. Overfilling
oil voids warranty.
Cooling Oil Recommended Supplier/Grade
BP
Enerpar SE100
Conoco
Pale Paraffin 22
Mobile
D.T.E. Oil Light
Shell Canada
Transformer-10
Texaco
Diala-Oil-AX
Before any service work is
done, disconnect and lock
out electrical power to pump.
WARNING