Sears 390.253250 Owner's Manual
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Sears 390.253250 Owner's Manual

Multi-stage jet pump
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OWNER'S
MANUAL
MODEL NO.
390.253250
CAUTION:
Read and Follow
All Safety Rules and
Operating Instructions
Before First Use of
This Product.
Save This Manual For
Future Reference.
Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A.
PRINTED IN U.S.A.
MULTI-STAGE JET PUMP
• Safety Instructions
• Installation
• Electrical
• Operation
• Maintenance
• Repair Parts
F642-9502
Form No.
(Rev. 6/20/97)

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Summary of Contents for Sears 390.253250

  • Page 1 Before First Use of • Installation This Product. • Electrical Save This Manual For • Operation Future Reference. • Maintenance • Repair Parts Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A. PRINTED IN U.S.A. F642-9502 Form No. (Rev. 6/20/97)

  • Page 2: Table Of Contents

    REPAIR PARTS .............16-19 FULL ONE YEAR WARRANTY ON PUMPS For one year from the date of purchase, Sears will repair or replace this pump free of charge, if defective in material or work- manship. This warranty does not cover repairs or replacement parts necessary because of abuse, negligence including failure to install, adjust and operate this pump according to the instructions in the owners manual.

  • Page 3: Major Components

    Install a relief valve (Sears Stock No. 27229) set AVC. An annual check on the tank pre-charge pressure to open at 75 PSI.

  • Page 4: Pump Performance

    * Jet Package No. 29670 – 2” Single Pipe (use 1-1/4” galvanized pipe). ** Jet Package No. 29902 – 3” Single Pipe (use 1-1/4” galvanized pipe). *** Jet Package No. 29660 – 4” Double Pipe. † Must be ordered through Sears Product Service, 1-800-366-7278.

  • Page 5: Installation

    INSTALLATION Do not use on shallow wells! Dirt and Scale Plug Pump and Pipes! (25 feet or less in depth) Use New Pipe for Best Results. Deep well is more than 25' (7.6M) to water with Pump pump running. Body Well Clean Flow! Casing...
  • Page 6 DEEP WELL INSTALLATION FOR DOUBLE PIPE Pump Pump Priming Tee and Gasket Gasket Plug Adapter Flange Adapter Flange Union Threadless Coupling Suction: 1-1/4" Drive: Pipe or Plastic Threadless Coupling Sanitary Sanitary 1-1/4" Pipe Well Seal Well Seal Pipe Adapter or Plastic Steel Pipe Nipple Coupling Pipe...
  • Page 7 100’ to 300’ which may occur in the piping and foot valve as the Model Suct. Drive Suct. Drive Suct. Drive piping is assembled. 390.253250 1-1/4” 1-1/4” 1-1/2” 1-1/4” 2” 2” Single Pipe Ejector Installation NOTICE: Fill pipe with water as each length is added Single pipe installations require (see Figure 9): to be sure foot valve and connections do not leak.
  • Page 8 PRESSURE TANK CONNECTION TANK Air Volume Control To Service Sears Stock No. 2761 TANK Pressure Regulator Pump to Tank Piping 1” Discharge 1 0 0 Relief Valve Sears Stock No. 27229 Pressure AVC Fitting Regulator Piping Tee and Air Volume Control Tubing/Fitting 1”...

  • Page 9: Electrical

    ELECTRICAL Ground motor before connecting to electri- WARNING cal power supply. Failure to ground motor can cause severe or fatal electrical shock hazard. Hazardous voltage. Can shock, burn, or cause To avoid dangerous or fatal electrical shock, death. turn OFF power to motor before working on Ground pump before electrical connections.

  • Page 10: Operation

    ELECTRICAL / OPERATION 1 0 0 1 0 0 2360a 0697 2361a 0697 1030a 0697 A – Close Regulator B – Fill Pump With Water C – Start Pump D – Adjust Regulator Figure 15 – Priming Pump 4. Connect power supply leads to switch terminals b.

  • Page 11: Helpful Hints / Maintenance

    OPERATION / MAINTENANCE regulator valve until pressure falters (pressure Air Control In Flowing Wells gauge needle flutters; pump may become noisy - see Flowing wells or wells with little or no drawdown, Figure 16B). At this point, close (turn clockwise) could create a special problem in air control in the op- regulator valve slightly until pressure stabilizes.
  • Page 12 MAINTENANCE Pump Diassembly 8. Hold the motor shaft with pliers or vice grips through the opening in the pump adapter. Unscrew 1. Pull disconnect switch. Disconnect power lines the impeller nut off the end of the shaft (see Figure from pressure switch. 20).
  • Page 13 MAINTENANCE 11. Remove the intermediate volute and slide the im- 4. Carefully slide the adapter over the shaft (see peller spacer off of the shaft. Figure 24). Do not damage the shaft sealing surface; it is highly polished and any slight scratches or nicks 12.
  • Page 14 MAINTENANCE 9. Install the intermediate volute, aligning it with the 12. Insert the four base capscrews and tighten evenly mark made before disassembly. Use the long cap (see Figure 26). These should be easy to install if ev- screws to check this alignment. It cannot be erything is correctly aligned.

  • Page 15: Troubleshooting Guide

    TROUBLESHOOTING CHART SYMPTOM POSSIBLE CAUSE(S) CORRECTIVE ACTION Motor will not run 1. Disconnect switch is off 1. Be sure switch is on 2. Fuse is blown 2. Replace fuse 3. Starting switch is defective 3. Replace starting switch 4. Wires at motor are loose, discon- 4.

  • Page 16: Repair Parts

    REPAIR PARTS Multi-Stage Jet Pump Model 390.253250 1 0 0 1281 0994 Pressure Regulator 1 0 0 2080 1095...
  • Page 17 U36-36ZP Nut 1/4-20 U78-107DT Reducer Bushing 1/2x1/8 NPT U239-3 Pressure Gauge 0-100# J24-13 Spring J61-5 Spring Guide J52-9 Bonnet To Order Parts, U30-60ZP Capscrew 5/16-18x3/4” Lg. (4 Req.) Call Sears Product Service, U30-69FTZP Adjusting Screw 5/16-18x2” 1-800-366-7278 U36-37ZP Locknut 5/16-18...
  • Page 18 REPAIR PARTS Sears Vertical Casing Adapters and Adapter Flanges To Order Parts, for Multi-Stage Jet Pump Call Sears Product Service, 1-800-366-7278 489 0194 Adapter Flange Casing Adapter Repair Parts List - Adapter Flange Model No. 390.253250 Part Description J20-12 Adapter Gasket J2-17B Adapter –...
  • Page 19 1” x 6” T.O.E. Nipple • Not illustrated. Venturi Selection Chart Max. Depth with Jet Package No. 29670 29902 29660 Pump Venturi 2” Single 3” Single 4” Double Model Installed Pipe Pipe Pipe J32P-24 90’ 100’ 100’ 390.253250 J32P-18 180’ 210’ 210’...
  • Page 20 Maintenance Agreement or to inquire about an existing Agreement call 9 am - 5 pm, Monday-Saturday • Product Type 1-800-827-6655 • Model Number • Part Number • Part Description REPAIR SERVICES America's Repair Specialists Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A.

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