Sears 390.250251 - User Manual

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For the repair or replacement parts you need

Call 7 am - 7 pm, 7 days a week

1-800-366-PART

(1-800-366-7278)

For in-home major brand repair service

Call 24 hours a day, 7 days a week

1-800-4-REPAIR

(1-800-473-7247)

For the location of a

Sears Repair Service Center in your area

Call 24 hours a day, 7 days a week

1-800-488-1222

For information on purchasing a Sears

Maintenance Agreement or to inquire

about an existing Agreement

call 9 am - 5 pm, Monday-Saturday

1-800-827-6655

MAINTENANCE

AGREEMENT

America's Repair Specialists

REPAIR SERVICES

America's Repair Specialists

REPAIR SERVICES

America's Repair Specialists

REPAIR SERVICES

Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A.

OWNER’S

MANUAL

Model No.

390.250251

The model number of

your Shallow Well Jet

Pump will be found on

the pump body.

When requesting service

or ordering parts, always

give the following

information:

• Product Type

• Model Number

• Part Number

• Part Description

SHALLOW WELL

JET PUMP

Table of Contents

Questions and Answers

J
John AdkinsAug 2, 2025
Why does my Sears 390.250251 run but not shut off?
- K
  Katherine HernandezAug 2, 2025
  If your Sears Water Pump runs but doesn't shut off, it could be due to several reasons. The pressure switch might be out of adjustment or its contacts may be frozen; try adjusting or replacing it. Also, check if any faucets have been left open and close them. A clogged jet or impeller can also cause this issue, so clean them. If the water level in your well is lower than expected, consider using a deep well jet pump. Finally, ensure the motor is wired correctly by referring to the wiring instructions.
M
Melanie Morales PhDAug 6, 2025
How to troubleshoot a Sears 390.250251 Water Pump when the motor will not run?
- J
  john75Aug 6, 2025
  If your Sears Water Pump motor won't run, first, ensure the disconnect switch is on. If that's not the issue, check for a blown fuse and replace it if necessary. A defective starting switch could also be the problem, so consider replacing it. Inspect the wires at the motor for looseness, disconnections, or incorrect wiring, referring to the wiring instructions to check and tighten them. Also, make sure the motor is wired correctly according to the instructions. Lastly, check the pressure switch contacts and clean them by sliding pieces of plain paper between the contacts.
J
Jane WyattAug 10, 2025
Why is my Sears 390.250251 cycling too frequently?
- C
  Catherine CarpenterAug 11, 2025
  Frequent cycling of your Sears Water Pump can be caused by several factors. If you have a standard pressure tank, it might be water-logged with no air cushion; drain the tank to the air volume control tapping and check the air volume control for defects, also check for air leaks at any connection. A pipe leak could also be the cause; check all connections. Ensure that faucets or valves are not open and close them if they are. A leaking foot valve can also lead to frequent cycling, so replace it if necessary. If the pressure switch is out of adjustment, replace it. For SEARS Captive Air® Tanks, a low air charge can be the culprit; disconnect electrical power, relieve pressure, and check/adjust air pressure using a tire pressure gauge, also check the air valve for leaks.
T
Tracy CoxAug 14, 2025
What to do if my Sears 390.250251 motor runs hot and the overload kicks off?
- S
  Stephen Schmidt MDAug 14, 2025
  If your Sears Water Pump motor runs hot and the overload kicks off, it could be due to incorrect wiring, so refer to the wiring instructions. Low voltage can also cause this issue; check with your power company and consider installing heavier wiring if the wire size is too small, referring to the wiring instructions. Additionally, the pump might be cycling too frequently; consult the section on too frequent cycling for solutions.
B
Brian SmithAug 23, 2025
Why is my Sears 390.250251 Water Pump delivering air spurts from faucets?
- M
  Melanie HeathAug 23, 2025
  If your Sears Water Pump is delivering air spurts from the faucets, it could be due to several reasons. The pump might be in the process of picking up prime; once it does, the air should be ejected. There could also be a leak in the suction side of the pump; check the suction piping. Another possibility is that the well is gaseous; change the installation as described in the manual. Intermittent over-pumping of the well could also cause this; lower the foot valve if possible, or restrict the discharge side of the pump.
E
Eric HullAug 27, 2025
What causes a Sears 390.250251 to not deliver water to full capacity?
- M
  michaelwelchAug 27, 2025
  If your Sears Water Pump does not deliver water to full capacity, it could be due to several reasons. The water level in the well might be lower than estimated, in that case a deep well jet pump may be needed (over 20 ft. to water). Corroded or limed steel piping can cause excess friction; replace it with plastic pipe where possible, or with new steel pipe. Also, offset piping might be too small in size; use larger offset piping.
J
justinmercadoNov 18, 2025
Why does my Sears 390.250251 run but no water is delivered?
- L
  linda30Nov 18, 2025
  If your Sears Water Pump runs but delivers no water, several issues could be at play. If it's a new installation, the pump might not have picked up prime due to improper priming, air leaks, or a leaking foot valve; re-prime according to instructions, check all connections on the suction line, air volume control, and jet, and replace the foot valve if needed. If the pump has lost prime in an existing installation, check for air leaks and ensure the water level is above the suction point; check all connections on the suction line, air volume control, jet, and shaft seal, lower the suction line into the water and re-prime, consider a deep well pump if the water level is too low. Also, a plugged jet or impeller can prevent water delivery; clean them according to instructions. Check if the chec...

Summary

Major System Components

Tank and Air Volume Control

Explains the functions of the water tank and the air volume control for pump operation.

Pressure Switch Operation

Details how the pressure switch provides automatic control of the pump.

Impeller and Jet Function

Describes how the impeller and jet create vacuum and deliver water at high pressure.

Piping and Well Installation

Covers installation methods for shallow well jet pumps in various well types.

Troubleshooting Guide

Electrical Connections

Wiring Diagrams

Illustrations for 115/230 volt motor wiring connections through pressure switch.

Wiring and Fusing Data

Recommended fusing and wire size data based on motor horse power and distance.

Introduction

Warranty Information

Safety Instructions

Pump Installation

Air Volume Control Setup

Instructions for installing the air volume control with standard horizontal tanks.

Priming the Pump

Steps to fill the pump with water before starting to prevent damage.

Maintenance Procedures

Lubrication and Winter Draining

Instructions on pump lubrication and how to drain the pump for winter protection.

Shaft Seal Servicing

Detailed steps for removing and installing the mechanical shaft seal unit.

Repair Parts Identification

Motor Service Parts

List of replacement parts for the motor assembly with key numbers and descriptions.

Pump Components and Parts

Detailed list of pump body components and replacement parts with key numbers.

Summary

Major System Components

Tank and Air Volume Control

Explains the functions of the water tank and the air volume control for pump operation.

Pressure Switch Operation

Details how the pressure switch provides automatic control of the pump.

Impeller and Jet Function

Describes how the impeller and jet create vacuum and deliver water at high pressure.

Piping and Well Installation

Covers installation methods for shallow well jet pumps in various well types.

Troubleshooting Guide

Electrical Connections

Wiring Diagrams

Illustrations for 115/230 volt motor wiring connections through pressure switch.

Wiring and Fusing Data

Recommended fusing and wire size data based on motor horse power and distance.

Introduction

Warranty Information

Safety Instructions

Pump Installation

Air Volume Control Setup

Instructions for installing the air volume control with standard horizontal tanks.

Priming the Pump

Steps to fill the pump with water before starting to prevent damage.

Maintenance Procedures

Lubrication and Winter Draining

Instructions on pump lubrication and how to drain the pump for winter protection.

Shaft Seal Servicing

Detailed steps for removing and installing the mechanical shaft seal unit.

Repair Parts Identification

Motor Service Parts

List of replacement parts for the motor assembly with key numbers and descriptions.

Pump Components and Parts

Detailed list of pump body components and replacement parts with key numbers.

Sears 390.250251 Specifications

General

Brand	Sears
Model	390.250251
Category	Water Pump
Language	English

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