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STA-RITE MSC-7 - User Manual

STA-RITE MSC-7
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OWNER’S MANUAL
Multi-Stage Deep Well Jet Pumps
20
100
80
60
40
©2001, Sta-Rite Industries, Inc. PRINTED IN U.S.A. S757-1 (Rev. 10/31/01)
293 Wright Street, Delavan, WI 53115
“MS” Series
Installation/Operation/Parts
For further operating, installation, or maintenance assistance:
Call 1-262-728-5551

Table of Contents

Questions and Answers

  • B
    browningmichelleAug 12, 2025
    How to fix a STA-RITE MSC-7 Water Pump motor that won't start?
    • E
      Elizabeth CookAug 12, 2025
      If your STA-RITE Water Pump motor isn't running, start by checking if the disconnect switch is on. Then, see if a fuse is blown or a circuit breaker has tripped and replace the fuse or reset the breaker if needed. Also, the starting switch might be defective, in this case disconnect the power and replace the starting switch. Loose, disconnected, or incorrectly wired wires at the motor could also be the cause; disconnect the power and check and tighten all wiring. Lastly, dirty pressure switch contacts can prevent the motor from running; disconnect the power and file the contacts with an emery board or nail file.
  • R
    Renee BryantAug 22, 2025
    Why am I getting air spurts from the faucets with my STA-RITE MSC-7?
    • E
      Erika CareyAug 22, 2025
      If you're experiencing air spurts from your faucets with your STA-RITE Water Pump, it could be due to several reasons. The pump might be picking up prime; when it has picked up prime, it should pump solid water with no air. There could be a leak in the suction side of the pump; check joints for leaks with soapy water. The well itself might be gaseous; consult the factory about installing a sleeve in the well. Or, intermittent over-pumping of the well might be occurring, where water is drawn down below the foot valve; lower the foot valve if possible, otherwise restrict pump discharge.
  • E
    Emily BairdAug 27, 2025
    Why is my STA-RITE Water Pump not delivering water to full capacity?
    • R
      Raymond ThomasAug 27, 2025
      If your STA-RITE Water Pump isn't delivering water to its full capacity, it could be because the water level in the well is lower than estimated; a deep well jet may be needed if your well depth to water is more than 25’ (7.6M). If you're using steel piping, it might be corroded or limed, causing excess friction; replace it with plastic pipe where possible, or with new steel pipe. Also, the offset piping might be too small in size; use larger offset piping.
  • A
    Antonio GregorySep 1, 2025
    Why does my STA-RITE MSC-7 Water Pump motor run hot and the overload keeps tripping?
    • F
      Frederick MaldonadoSep 1, 2025
      If your STA-RITE Water Pump motor runs hot and the overload kicks off, it could be due to a few reasons. The motor might be wired incorrectly; refer to the wiring instructions. The voltage could be too low; check with the power company. Also, the pump might be cycling too frequently; see the section on too frequent cycling.
  • C
    Chris SanchezNov 6, 2025
    Why does my STA-RITE Water Pump keep cycling on and off?
    • M
      mdeleonNov 6, 2025
      Your STA-RITE Water Pump might be cycling too frequently due to several reasons. The pressure switch may be out of adjustment or have welded contacts—disconnect power and adjust or replace it. Faucets might be left open, so ensure they are closed. A clogged venturi, nozzle, or impeller can also cause this, so clean them. The water level in the well could be lower than estimated; consider a deep well jet pump. A waterlogged standard pressure tank without an air cushion can also be the issue, so drain the tank to the air volume control port. Check all connections for air leaks, and replace any leaking foot valves. Finally, the air charge in a pre-charged tank might be too low. Use a tire pressure gauge to check the air pressure at the valve stem. If it's less than the pressure switch cut-in ...
  • J
    Jacob BarnettNov 16, 2025
    What to do if my STA-RITE Water Pump motor runs but no water comes out?
    • J
      Jordan HermanNov 16, 2025
      If your STA-RITE Water Pump motor runs but no water is delivered, the pump in a new installation might not have picked up its prime; re-prime it according to the instructions. Check all connections on the suction line, AVC, and ejector for air leaks using soapy water or shaving cream. A leaking foot valve or check valve can also be the problem, so replace them if necessary. The pump might have lost prime through air leaks or the water level being below the suction pipe inlet; check all connections on the suction line and shaft seal. Ensure the foot valve or strainer isn't plugged by cleaning it. Also, check if the ejector or impeller is plugged and clean them. A stuck check valve or foot valve can prevent water delivery, so replace them if needed. Frozen pipes can also stop water flow, so ...

Summary

Safety

Electrical Safety

Essential safety guidelines for electrical components.

General Safety

Electrical

Motor Wiring Connections

Connecting motor wiring to the pressure switch for correct voltage.

Wiring Connections

Important safety and code compliance notes for pump wiring.

Connection Procedure

Steps for proper grounding and connecting power supply wires.

Wiring Chart

A chart detailing wire and fuse sizes based on motor HP and distance.

Operation

Priming the Pump

Detailed instructions for priming the pump before starting operation.

Maintenance

Pump Disassembly;Assembly

Step-by-step guide for disassembling and reassembling the pump.

Installation of New Seal

Troubleshooting

STA-RITE MSC-7 Specifications

General IconGeneral
BrandSTA-RITE
ModelMSC-7
CategoryWater Pump
LanguageEnglish

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