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ST-4125D/ST-6125D SUBMERSIBLE PUMPS — OPERATION AND PARTS MANUAL — REV. #1 (06/12/08) — PAGE 11
ST-4125D/ST-6125D — SUBMERSIBLE PUMP COMPONENTS
Figure 2 shows the location of the basic components, for
the ST-4125D and ST-6125D submersible pumps. Listed below
is a brief explanation of each component.
1. Strainer Base – This strainer base is made of stainless
steel which is resistant to hardware corrosion. For
dewatering purposes, always place the strainer base
on a platform.
2. Volute/Impeller – Impellers are constructed of cast
ductile iron to minimize wear and prolong service life.
3. Electric Motor – The ST-4125D pump utilizes a 60 Hz,
three-phase, 230/460 VAC, 10 HP electric motor and
the ST-6125D pump utilizes a 60 Hz, three-phase, 230/
460 VAC, 15 HP electric motor. Consult with a
licensed
electrician
before connecting motor to a power source.
Observe all city and local safety codes.
4. Discharge Port – Connect a 4-inch hose (ST-4125D)
or 6-inch hose (ST-6125D) to this port. Remember to
adequately support the discharge hose to avoid stress
on the pump.
5. AC Power Cable – These pumps are supplied with a
50 ft. (15.2 meters) AC power cable. Always check the
cable for signs of wear. NEVER use a defective power
cable. Replace the cable immediately if the cable is
worn or defective.
6. Eye Bolts – Always lift the submersible pump by the
eye bolts using a chain and lifting device capable of
lifting about 400 lbs. NEVER lift the pump by its power
cord! Lifting the pump by the power cord will cause
undue stress on the cord and ultimately the cord will
become dislodged from the pump.
7. Mechanical Seal Oil – This oil-filled seal provides
lubrication when running the pump dry. NEVER run the
pump dry! Running the pump dry will cause severe
damage to the pump.
8. Mechanical Seal Oil Plug – Remove this plug to
check and add hydraulic oil (Shell 32 or equivalent) to
the oil cavity. This oil protects the mechanical seal. Oil
cavity should be full enough to cover seal spring.
Figure 2. Submersible Pump Components
ST-4125D
ST-6125D
SUBMERSIBLE
PUMP
ST-6125D
SUBMERSIBLE
PUMP
ST-4125D
3
3
8
8
2
2
5
5
1
1
6
6
7
7
4
4