Sears 390.253250 User manual

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.
• Safety Instructions
• Installation
• Electrical
• Operation
• Maintenance
• Repair Parts
PRINTED IN U.S.A.
MULTI-STAGE JET PUMP
Form No. F642-9502 (Rev. 6/20/97)
FOR POSITION ONLY

2
CONTENTS
INTRODUCTION/WARRANTY..................................2
MAJOR COMPONENTS..............................................3
PUMP PERFORMANCE...............................................4
INSTALLATION........................................................5-8
ELECTRICAL..........................................................9-10
OPERATION ........................................................10-11
HELPFUL HINTS / MAINTENANCE.....................11-14
TROUBLESHOOTING GUIDE ..................................15
REPAIR PARTS .....................................................16-19
INTRODUCTION
Please read our instructions before installing and using
yourDeepWellJetPump.This willhelp youobtainthe
full benefits of the quality and convenience built into
thisequipment. Itwill alsohelp youavoidanyneedless
serviceexpenseresultingfromcausesbeyondour con-
trol which are not covered by our warranty.
Carefully read and follow all safety instructions in this
manual or on pump
This is the safety alert symbol. When you see this
symbol on your pump or in this manual, look for
one of the following signal words and be alert to the
potential for personal injury!
Warns about hazards that will cause seri-
ous personal injury, death or major property damage if
ignored.
Warns about hazards that will or can
cause serious personal injury, death or major property
damage if ignored.
Warns about hazards that will or can
cause minor personal injury or property damage if ig-
nored.
The word NOTICE indicates special instructions
which are important but not related to hazards.
1. To avoid risk of serious bodily injury and property
damage, read safety instructions carefully before in-
stalling pump.
2. Follow local and/or national plumbing and electri-
cal codes when installing pump.
3. Keepwellcoveredwhileinstallingpumptoprevent
leaves and other debris from falling into well, con-
taminating well and possibly damaging pump.
4. Protect pump and piping system from freezing.
Allowing pump or water system to freeze could
severely damage pump and voids warranty.
To avoid serious injury and equip-
ment damage, limit system pressure to 100
pounds per square inch (PSI) or below at all
times. Over-pressure can cause tank blowup; in-
stall relief valve capable of passing full pump vol-
ume at 100 PSI.
5. With a new well, test well for purity before use.
Consult local Health Department for procedure.
Hazardous voltage. Can shock, burn,
cause death, or start fires.
6. Disconnect electrical power source before in-
stalling or working on pump.
7. Groundpumpwitha groundwirerunfromground-
ing lug on motor to a grounded lead in the service
panel.
8. Line voltage and frequency of electrical power sup-
ply must agree with motor nameplate.
9. Useoffusesorwiresmallerthansizerecommended
in owner’s manual can cause overheating, possible
fires, and will void warranty.
10. This pump is a deep well jet pump. It is not de-
signed or intended for shallow well use. Use in a
deep well (more than 25’ depth to water).
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.
LIMITATION OF LIABILITY
SEARSWILL NOT BELIABLE FORLOSS ORDAMAGE TO PROPERTYOR ANYINCIDENTAL ORCONSEQUENTIAL LOSS
OR EXPENSE FROM PROPERTY DAMAGE DUE DIRECTLY OR INDIRECTLY FROM THE USE OF THIS PRODUCT.
Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclu-
sion may not apply to you.
WARRANTY SERVICE IS AVAILABLE BY SIMPLY CONTACTING THE NEAREST SEARS SERVICE CENTER/DEPART-
MENT IN THE UNITED STATES of AMERICA.
For service outside the U.S.A., contact your local Sears Service Center or store.
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
Sears, Roebuck and Co., Dept. 817 WA, Hoffman Estates, IL 60179
RULES FOR SAFE INSTALLATION AND OPERATION

3
MAJOR COMPONENTS AND WHAT THEY DO
Tank and Air Volume Control
The tank serves two functions:
1. It provides a reservoir of water. Some of this water
isdrawnoffwheneverahousefixtureisopened(so
that the pump doesn’t need to start every time you
open a tap).
2. It maintains a cushion of air under pressure.
A standard tank requires an Air Volume Control
(AVC) to add air to the tank when needed. See the
instructions included with the AVC for details of in-
stallation and operation.
A SEARS Captive Air®tank maintains a constant
precharge of air in the tank and does not require an
AVC. An annual check on the tank pre-charge pressure
is recommended.
Impeller
The pump’s impeller rotates with the motor shaft,
causing the water to fly out from its rim by centrifugal
force. The rotation of the impeller, along with the mo-
tion of the water, creates a vacuum at the center of the
impeller (the “eye” of the impeller) which pulls in
more water.
The Vertical Multi-Stage (VMS) pump has two or three
(“multiple”) impellers; the water feeds through them
one after the other, with each impeller adding to the
pressure. This allows the VMS jet pump to pull water
from greater depths and at a higher pressure than a
conventional single stage jet pumps.
Jet
The jet is a nozzle/venturi arrangement installed in the
wellwhichdriveswaterupto thepump fromthe well,
boosting the water pressure going into the impellers.
The jet allows water to be lifted from a greater depth
than would be possible with only the impeller eye’s
vacuum. In order to drive the jet, part of the discharge
stream from the pump is diverted back “down the
hole” to the jet to help lift water from the well into the
pump suction.
Pressure Regulator
The pressure regulator is adjusted at installation to di-
vert the correct amount of water back to the jet for the
mostefficientoperation.Undercertain conditions, the
pressure regulator may require adjustment during the
pump’s life (see Page 10) to restore or maintain the
pump’s efficiency.
Pressure Switch
The pressure switch automatically starts the pump
when the pressure in the tank drops to 40 pounds per
square inch (PSI) and stops the pump when the tank
pressure reaches 60 PSI.
Adapter Flange
The VMS pump is equipped with an adapter flange.
This adapter facilitates installation and removal of the
pump without disturbing piping. See Pages 6 and 7 for
more information.
Pressure Relief Valve
Under certain conditions, VMS pumps can generate
veryhighpressure.Thepressurereliefvalveisinstalled
to make sure that the pressure in the system does not
exceedthe pressurewhichthesystemcan carry safely.
The pressure relief valve must be able to pass all the
waterthepump canproduce atthe system’sratedpres-
sure. Install a relief valve (Sears Stock No. 27229) set
to open at 75 PSI. between the pump and the tank.
There should be no shutoff valves between the pump
and the relief valve. See Figures 11 and 12, Page 8, for
more information.
Pump Mounting
The pump base has four equally spaced 3/4” NPT
threaded sockets. These will take threaded pipe for
legs, to allow enough room to make piping connec-
tions under the pump.
Inthecase of a single pipe installation (see below),the
pump can be placed directly over the well, using the
offset nipple furnished with the casing adapter to con-
nect the pump to the well head.
Piping
When installed on a ‘double pipe’ jet, one pipe is the
pressureordrivepipe;thispipesends waterdowninto
the well to the jet. The other pipe is the suction pipe;
this pipe carries water up to the pump suction from
the jet. Because of the pressure requirements and
depth of multi-stage jet pump installations, use the
chart below for pipe selection.
When installed on a singe pipe jet, the well casing
serves as the drive pipe, carrying water to the jet. The
drop pipe inside the well is the suction pipe, carrying
water up to the pump from the jet.
Usea ‘singlepipe’ systemfora2” or3” well;usea ‘dou-
ble pipe’ system for a 4” or larger well. See Pages 6 and
7 for details. Follow instructions packed with jet pack-
age to get proper nozzle and venturi combination for
your pumping depth.
Use 1-1/4” pipe for both suction and drive pipes. A 1”
nipple, a 1-1/4”x1” facing bushing, and a 1-1/4” cou-
pling are included in the jet package. These must be
used with the jet. (See Figure 8, Page 6, for installation
details.)

4
PUMP PERFORMANCE
Pump Jet Discharge
Stock Pkg. Pressure Pumping Depth In Feet
No. No. P.S.I. 40 60 70 80 90 100 110 120 140 160 180 210
40 11.3 10.0 8.8 7.6 6.5 5.0 5.0 5.0 4.2 3.5 2.0
29670* 60 10.6 8.6 7.5 6.5 5.5 4.8 4.8 4.7 3.9 2.7 1.5
390.253250 40 11.7 11.1 10.2 9.2 7.8 6.4 5.1 5.0 4.5 4.0 3.2 2.1
1HP 29902**† 60 11.0 9.5 8.6 7.8 6.6 5.4 4.7 4.6 4.2 3.4 2.6 1.7
40 11.7 11.1 10.2 9.2 7.8 6.4 5.1 5.0 4.5 4.0 3.2 2.1
29660*** 60 11.0 9.5 8.6 7.8 6.6 5.4 4.7 4.6 4.2 3.4 2.6 1.7
Multi-Stage Pump
Pump Performance (in gallons per minute)
Use 160 PSI Min. Rating Plastic Pipe.
* 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.

INSTALLATION
5
NOTICE: For proper performance, pump MUST be
matched to ejector and to well depth. Use this pump
on wells 25’ to 210’ deep.
1. Longrunsandmanyfittingsincreasefrictionandre-
duceflow.Locatepumpasclosetowellaspossible:
use as few elbows and fittings as possible.
2. Be sure well is clear of sand. Sand will plug the
pump and void the warranty.
3. Protectpumpandallpipingfromfreezing.Freezing
willsplitpipe,damagepumpandvoidthewarranty.
Check locally for frost protection requirements
(usually pipe must by 12” below frost line and
pump must be insulated).
4. Be sure all pipes and foot valve are clean and in
good shape.
5. No air pockets in suction pipe.
6. No leaks in suction pipe. Use Teflon tape or Plasto-
Joint Stik to seal pipe joints.
7. Match pump to well.
IMPORTANT: Flow into well must at least equal
flow out through pump!
8. Unions installed near pump and well will aid in ser-
vicing. Leave room to use wrenches.
Motor normally operates at high temper-
ature and will be too hot to touch. It is protected from
heatdamageduringoperationby anautomatic internal
cutoff switch. Before handling pump or motor, stop
motor and allow it to cool for 20 minutes.
1096 0697
Pump
Body
From
Well
Dirt and Scale Plug Pump and Pipes!
Use New Pipe for Best Results.
Clean Flow!
1100 0697
No Sags
Sags Allow Air Pockets
If Air Pockets Form, Water Won’t Flow.
Keep Pipe Straight and Angled up to Pump.
1101 0697
1102 0697
No Air Leaks
in Suction Pipe.
Pipe Joint
Compound Will
Damage Plastic.
If Air Flows
Water Won’t
Use Teflon Tape.
Figure 1 – No Dirt or Scale in Suction Pipe
Figure 2 – Foot Valve Must Work Freely
Figure 3 – No Air Pockets in Suction Pipe
Figure 4 – Suction Pipe Must Not Leak
Well
Casing
822b 0697
Do not use on shallow wells!
(25 feet or less in depth)
Foot
Valve &
Strainer
Deep well is more
than 25' (7.6M)
to water with
pump running.
Figure 5 – Use Pump On Deep Well Only

DEEP WELL INSTALLATION FOR DOUBLE PIPE
Piping In The Deep Well
See Figures 6, 7, and 8.
NOTICE: Deep well installations are either single pipe
(2”wells)or doublepipe(4” andlargerwells).In adou-
ble pipe installation, the larger pipe is the suction pipe
and the smaller pipe is the drive pipe (very deep wells
mayusesuction anddrivepipes ofthesame diameter).
Plastic pipe is ideal for double pipe installations. Due
toits light weight,it iseasyto handle and doesnotusu-
ally require a block and tackle for installation and re-
moval.
Double Pipe Installation – Plastic Pipe
NOTICE: Use Teflon tape on all male threads on plas-
tic pipe and fittings to prevent air leaks in suction pip-
ing.
1. Inspect ejector to make sure that nozzle and ven-
turi openings are clean and clear.
2. Inspectpipe forany foreignmatter or obstructions.
NOTICE: Make sure that no foreign matter enters pipe
openings while installing pump.
3. Make sure foot valve operates freely: attach to ejec-
tor with a close nipple. Use Teflon tape on male
threads.
4. Install nozzle and venturi in deep well ejector.
5. Using Teflon tape on male threads, install special
plastic pipe adapter (supplied with ejector) by
screwing adapter into 1-1/4” tapped hole in ejector
body (see Figures 6 and 8, above).
6. Thread a 1” plastic pipe adapter or a 1” nipple into
the 1” tapped hole in ejector body (see Figure 8).
7. Install sufficient plastic pipe in well casing to place
ejector at the proper depth. (Your well driller
should supply this information.)
NOTICE: As a guide, the ejector should be set at least
10 to 20 feet below the lowest water level with pump
running, if possible, but always at least five feet from
the bottom of the well.
8. Tighten all hose clamps securely on plastic pipe.
Use two clamps per joint to prevent air leaks into
suction pipe. Clamp screws should be on opposite
sidesof the pipe.Fillpipes withwater to makesure
that foot valve and connections do not leak.
9. Install sanitary well seal on top of well casing; use
steel nipple through well seal as shown in Figure 6.
NOTICE: Align locating lugs on adapter flange and
pumpbase sothat pumpdischargewill bealigned with
piping.
10. Install 1” nipple in one side of adapter flange. Slide
threadless coupling down over drive pipe from
well. Thread adapter flange onto suction pipe from
well and align nipple and drive pipe.
11. Slide threadless coupling up and secure nipple to
drive pipe.
12. Removepaperbackingfromadhesivegasket.Apply
gaskettoadapterflange,makingsurethatholesline
up.
13. Alignlocatinglugs onpumpbasewithlocatinglugs
on adapter flange; attach pump to flange with cap
screws provided.
6
Pump Pump
Gasket Gasket
Adapter Flange Adapter Flange
Threadless Coupling
Sanitary
Well Seal
Steel Pipe Nipple
Coupling
1" Plastic Drive Pipe
1" Plastic Pipe Adapter
Ejector Assembly
1-1/4" Plastic Suction Pipe
Sanitary
Well Seal
1" Drive Pipe
Ejector Assembly
1-1/4" Suction Pipe
Threadless Coupling
A-OFFSET INSTALLATION
PLASTIC PIPE SHOWN B-OVER THE WELL INSTALLATION STEEL PIPE SHOWN
1461 0195
Union
Priming
Tee and
Plug
Special 1-1/4" Plastic Pipe
Adapter. (Supplied with Ejector)
Check Valve
Strainer
Check Valve
Strainer
Suction: 1-1/4"
Pipe or Plastic
Pipe Adapter
1" Nipple
1-1/4x1"
Face
Bushing
1-1/4"
Coupling
Drive:
1-1/4" Pipe
or Plastic
Pipe
Adapter
1386 1194
Figure 6 – Offset Installation
Plastic Pipe Shown Figure 7 – Over the Well Installation
Steel Pipe Shown Figure 8 – Jet Assembly With 1” and 1-1/4” Drive Pipes

14. See “Discharge Pipe Sizes” for information regard-
ing correct discharge pipe size.
Steel Piping
The special adapter nipple is not used with steel pip-
ing.
To more safely lower steel piping into the well, build a
tripod out of 2x4 lumber. A couple of pipe clamps can
also be made of 2x4s secured with 1/2” bolts (see
Figure 10B). Always install the coupling at the top end
of the pipe joint and install the pipe clamp below the
coupling. This will prevent accidentally dropping the
pipe into the well if the clamp slips. With steel pipe,
be sure all joints are clean and the ends reamed before
installing; use teflon tape or pipe joint compound at
each joint to prevent leakage.
Use a lever hoist (a “come-along”) to lower pipe into
well (see Figure 10A). As each section of piping is low-
ered into the well, fill it with water. This will help
prime the system and also serves as a check on leaks
which may occur in the piping and foot valve as the
piping is assembled.
Single Pipe Ejector Installation
Single pipe installations require (see Figure 9):
a. Galvanized steel suction pipe.
b. Leather packer-type ejector with built-in foot
valve.
c. Turned couplings (supplied with packer-type
ejector).
d. Well casing adapter (supplied with packer-type
ejector).
1. Connect ejector to first length of pipe. Use pipe
joint compound sparingly on male threads.
2. Lower pipe into casing. Use special turned cou-
plings (included with single pipe ejector package)
to increase water flow. Use pipe joint compound
sparingly on male couplings threads.
Horizontal Offset Pipe Sizes
When the pump is set more than 25’ to one side of the
well, increase the horizontal pipe size to reduce fric-
tion. Never use pipe smaller than the pump port size.
NOTICE: Fill pipe with water as each length is added
to be sure foot valve and connections do not leak.
7
Well Casing
serves as
Drive Pipe
Suction
Pipe
Venturi
Nozzle
Ejector
JET NO. J32P- 24
Offset Nipple
Cup
Leathers 5 Feet
or more
10 to 20 Feet
Water level
with pump
running
2357c 0797
Pump
mounted
on Casing
Adapter
Figure 10A – Use tripod and lever hoist to lower
pipe into the well
Pipe Clamp
Lever Hoist
Pipe Clamp
1387 1194
Turned Coupling
Figure 10B – Pipe clamp detail
Figure 9
DEEP WELL INSTALLATION FOR SINGLE PIPE
Pump Up to 25’ 25’ to 100’ 100’ to 300’
Model Suct. Drive Suct. Drive Suct. Drive
390.253250 1-1/4” 1-1/4” 1-1/2” 1-1/4” 2” 2”

PRESSURE TANK CONNECTION
3. Add lengths of pipe until the ejector reaches the
proper depth. (Your well driller should supply this
infor-mation.)
NOTICE: As a guide, the ejector should be set at least
10 to 20 feet below the lowest water level with pump
running,if possible,butalwaysatleast 5 feetabovethe
bottom of the well (see Figure 9, Page 7).
4. To properly seat the cup seals, after the ejector is
correctly positioned move the assembly up and
downslightly.Waterpressureinthecasingwillthen
soak the cup seals (see Figure 9). They should seal
in 2–3 hours after installation.
5. Withejectorset,installwellcasingadapter.Remove
pipe holder. Align locating lugs and tighten adapter
to form seal with well casing.
Discharge Pipe Sizes
1. If increasing discharge pipe size, install reducer in
pump discharge port. Do not increase pipe size by
stages.
2. When the pump is set away from the points of
water use, the discharge pipe size should be in-
creased to reduce pressure losses caused by fric-
tion.
• Up to 100 ft run: 1”
• 100 ft. to 300 ft run: 1-1/4”
• 300 ft. to 600 ft run: 1-1/2”.
Pressure Tank Installation - Deep Well
The Pressure Tank provides a reservoir of water under
pressure and maintains cushion of air pressure to pre-
vent pipe hammering and possible damage to plumb-
ing components. When water is drawn off through
house fixtures, the pressure in the tank is lowered and
the pressure switch starts the pump.
Standard Tank Connection
When a standard tank is used, an air volume control
(AVC)adds airto thetank whenit isneeded. SeeFigure
11 for typical standard tank installation. To connect
AVC to pump, thread a 1/8” compression fitting into
tapped hole on the front of the pump. Cut tubing to
length to reach AVC; assemble to fitting on pump and
to AVC on tank. See installation instructions provided
with tank and AVC for details.
Precharged Tank Connection
When a precharged tank is used, no AVC is necessary.
See Figure 12 for typical precharged tank installation.
A precharged tank contains a factory provided air
charge.
NOTICE: Your pump pressure switch is set for a 40-60
PSI range and requires a tank pre-charge of 40 PSI for
proper operation (see Figure 13). See tank owner’s air
charge. An annual check on tank charge is recom-
mended.
8
2355b 0697nc
Pressure
Regulator
Air Volume Control Tubing/Fitting
Sears Stock No. 27881
Figure 11 – Pump With Standard Tank
To Service
Pump to Tank Piping
1” Discharge
TANK
Air Volume Control
Sears Stock No. 2761
Relief Valve Sears
Stock No. 27229
Well Seal
AVC Fitting
1054 0697nc
10
20
30
Figure 13 – Checking Tank Pre-charge
Check Pressure with
Tire Gauge
Captive-Air® Tank
20 100
80
60
40
2358b 0697nc
Figure 12 – Pump With Captive-Air®Tank
Pressure
Regulator
Piping Tee and
1” Discharge
Relief Valve
To Service
TANK

ELECTRICAL
9
Ground motor before connecting to electri-
cal power supply. Failure to ground motor
can cause severe or fatal electrical shock hazard.
To avoid dangerous or fatal electrical shock,
turn OFF power to motor before working on
electrical connections.
Supply voltage must be within ±10% of
nameplate voltage. Use wire size specified in
Wiring Chart. If possible, connect pump to a sep-
arate branch circuit with no other appliances on
it. Incorrect voltage can cause fire or seriously
damage motor and voids warranty. If in doubt
consult a licensed electrician.
Wiring (Fig. 14)
1. Install, ground, wire and maintain pump in accor-
dance with your local electrical code and all other
codes/ordinances that apply. Consult your local
building inspector for local code information.
2. Ground pump permanently using wire of size and
type specified by approved local or national codes.
Risk of explosion. Do not ground to gas
supply line.
3. Connect ground wire first. Connect to ground first,
thentogreengroundingterminal providedonpres-
sure switch identified as GRD. Ground connection
MUST be made to this terminal. Do not connect
motor to electrical power supply until unit is per-
manently grounded; otherwise serious or fatal elec-
trical shock hazard may be caused.
4. For best ground connection, connect to grounded
leadinservicepanelortometalundergroundwater
pipeorwellcasingat least10ft.long.Ifplasticpipe
or insulated fittings are used, run ground wire di-
rectly to metal well casing or use ground electrode
furnished by the power company.
To Connect Pressure Switch (Fig. 14)
Make sure power to pump has been discon-
nected at service panel before connecting
pressure switch.
1. Match motor voltage to power supply voltage.
2. Remove switch cover.
3. Connect green ground wire to terminal in base or
sideofswitchmarkedGROUND,GRD,or .There
may be two ground terminals; connect to either
one.
WIRING CHART – Recommended Wire and Fuse Sizes
(*)Time delay fuse or circuit breakers are recommended in any motor circuit.
MOTOR MAX. LOAD BRANCH FUSE* DISTANCE IN FEET FROM MOTOR TO METER
HP VOLTS AMPS RATING (AMPS) 0 to 50 51 to 100 101 to 200 201 to 300
1 115/230 19.2/9.6 25/15 10/14 10/12 8/10 6/10
A
B
L2
L1
A
B
L2
L1
To convert from
230 to 115 Volts:
Move white wire
w/black tracer
from B to A.
Move black wire
from A to L1.
A
B
L2
L1
A
B
L2
L1
White w/
Black Tracer
Black
Motor Ground
Screw
1258 0994
Clamp
power
cable to
prevent
strain on
terminal
screws.
Connect green (or bare
copper) ground wire
to green ground screw.
Motor wires
are connected
to these two
screws.
Connect black and white
power supply wires to
these two screws, one
wire to each screw.
It doesn't matter which
wire goes to which screw.
Figure 14 – 115/230 volt motor wiring connec-
tions through typical pressure switch.
Dual voltage motors come factory wired for 230 volt
operation. Inset shows 115 Volt conversion.
Do not alter wiring in single voltage motors.
Match motor voltage to power supply voltage.
Disconnect power at service panel
before connecting pressure switch.
WARNING
Hazardous voltage.
Can shock, burn, or cause
death.
Ground pump before
connecting to power supply.

4. Connect power supply leads to switch terminals
marked LINE, L, or L1/L2.
5. Motor leads should be connected to switch termi-
nals marked LOAD, MOTOR, M or M1/M2. If not,
connect them to switch terminals.
6. Make sure that either:
a. Motor frame is connected to pressure switch by
a solid metal connection, or
b. Motor ground wire is connected to ground ter-
minal in switch.
Risk of electric shock. Do not operate pump
unless motor and pressure switch are con-
nected to each other by a solid metal connection
and are grounded.
7. Replace pressure switch cover. Pump is now wired
for operation.
Priming The Pump
Burn hazard. NEVER run pump dry.
Running pump without water may cause pump
to overheat, damaging seal and possibly causing
burns to persons handling pump. Fill pump with
water before starting.
Risk of explosion and steam burns.
NEVER run pump with discharge shut off, which
can boil water inside pump body. Steam in pump
may cause it to explode and scald anyone near.
NOTICE: Open water system faucets before priming
pump for the first time.
1. Remove pressure gauge.
a. Closeregulatorvalve(turn clockwise-seeFigure
15A).
b. Fill pump and suction pipe with water (Figure
15B).
c. Replace pressure gauge, using Teflon tape on
thread; tighten gauge.
NOTICE: If a priming tee and plug have been installed
for a long horizontal run, be sure to fill suction pipe
through this tee and replace plug. (Don’t forget to
teflon tape the plug.)
2. Start Pump:
Pressure should increase rapidly to 50 pounds per
square inch or more as ejector and pump prime. If
so, go to step 4, below.
If pressure does not build to 50 PSI, repeat steps a,
b, and c under Step No.1 two or three times to re-
move entrapped air from the suction pipes.
3. If pressure does not build up after priming pump
several times, check the following:
a. Suction pipe in the water.
b. Suction pipe has no leaks.
NOTICE: Air can leak in even where water won’t leak
out. Make sure all joints are tight.
c. Controlvalve,checkvalve,or footvalveinstalled
and operating correctly.
d. Pump trying to lift water more than rated lift for
deep well ejector used (including compensation
for horizontal offset).
e. Be sure pump is not airlocked. In offset install-
ations, pump suction port should be highest
point in suction pipe; there should be no sags in
suction pipe (run it straight and at a slight angle
upward from well head to pump).
4. Once unit has primed and pressure stabilized,
slowly open (turn counterclockwise - Figure 16A,
ELECTRICAL / OPERATION
10
20 100
80
60
40
2361a 0697
2360a 0697
20 100
80
60
40
1030a 0697
Figure 15 – Priming Pump
A – Close Regulator ➡ B – Fill Pump With Water ➡ C – Start Pump ➡ D – Adjust Regulator
ON

OPERATION / MAINTENANCE
regulator valve until pressure falters (pressure
gaugeneedleflutters;pumpmaybecomenoisy-see
Figure 16B). At this point, close (turn clockwise)
regulatorvalveslightlyuntil pressurestabilizes.This
setting provides maximum flow (Figure 16C).
5. Pumpmaydraw welldown farenough at this point
to lose its prime. If so, close regulator valve until
pressureisstablethroughout pumpingcycle. Close
faucetsandallow pumptopressurizetank andshut
off.
6. Check system by alternately opening and closing
faucets in the system. With faucets open, pressure
will drop until pump starts; with faucets closed,
pressure will build up until pump shuts off.
7. There are conditions of deep well operation when
the regulator valve may be completely open with-
out any faltering of pressure. In this case, operate
pump with regulator valve open.
HELPFUL HINTS / MAINTENANCE
How To Handle A Gaseous Well
Insome areaswellwatercontainsgases whichmustbe
allowed to escape before the water is used. To deliver
gas-freewatersuspendapipe,closedat thebottomand
open at the top, so that it surrounds the suction pipe
inlet. (See Figure 17). Since the gases rise in the well
casing, the water sucked down through the pipe and
into the suction pump is free of gas. This type of well
must be vented to the outside of any enclosure.
Air Control In Flowing Wells
Flowing wells or wells with little or no drawdown,
could create a special problem in air control in the op-
eration of your standard tank system. In such cases, a
pre-charged tank (which needs no air control) is
recommended.
Using the Compound Gauge
If the pump or system seems to be operating ineffi-
ciently, the compound gauge can sometimes help de-
termine the problem.
A compound gauge is a combination vacuum and pres-
suregaugewhichwillindicate (1)recedingwaterlevel
in the well, (2) leakage in the suction line or in the
pump, or (3) clogged impeller.
To use,install thegaugein theair volumecontrol(AVC)
port in the base of the pump. Open all shutoff valves
between pump and household piping. Tighten regula-
tor screw as far as possible. After running pump a few
minutes to eliminate all air from pipes, loosen regula-
torscrewuntilcompoundgaugeshows15”of vacuum.
This setting indicates that the pressure regulator is set
for delivery of the highest volume of water possible.
Let the pump run a few minutes; if the water level in
the well is falling, the vacuum will increase. If neces-
sary, reduce the regulator setting to bring the vacuum
reading back to 15”. If the pump does not develop 15”
ofvacuumaccordingthe gauge,youmayhaveair leaks
in the suction line or a clogged impeller.
Cleaning the Deep Well Jet
1. Disconnect power.
2. Disconnect piping and well seal or casing adapter.
3. Withdraw jet assembly from the well.
4. Unscrew and remove the venturi. Remove the noz-
zle with a socket wrench and clean.
5. Replace all parts, reprime, and turn on power.
11
Figure 17 – Gas/Air Control in Well
Pipe strap or
wire to hold
pipe sleeve
Pipe
sleeve
Pipe
cap
Tail
pipe
Foot
valve
Ejector
Gases
rise to
surface
20 100
80
60
40
20 100
80
60
40
20 100
80
60
40
Figure 16C – Close Regulator Valve until
Pressure Stabilizes
Figure 16B – Watch for Pressure Gauge to Flutter
Figure 16A – Open Regulator Valve

MAINTENANCE
Pump Diassembly
1. Pull disconnect switch. Disconnect power lines
from pressure switch.
2. Remove the two cap screws holding the pump to
the flange adapter. Don’t disturb the piping in the
well.
3. Remove the flange adapter gasket and scrape the
surfaces clean.
4. Leaving the tubing in place, unscrew and remove
the straight barbed fitting at the pressure switch.
5. Draw a line down the side of the pump with a
marker to help alignment during reassembly. Mark
the pump from the motor to the base volute (see
Figure 18).
6. Turn the pump upside down on the bench and
blockit.Removethefourcapscrewsfromthebase.
With a mallet, tap upward on the base to loosen it.
Lift the base off of the intermediate volute (see
Figure 19).
7. To reduce the chance of dropping the pump onto
your foot, lay it down on the bench; block it so it
won’t roll.
8. Hold the motor shaft with pliers or vice grips
throughtheopeningin thepumpadapter.Unscrew
the impeller nut off the end of the shaft (see Figure
20).
9. The impellers are keyed to the shaft and do not un-
screw. Insert two screw drivers on opposite sides
under the exposed impeller and pry the impeller
off (Figure 21) to remove it.
10. Carefully tap a small screwdriver or thin bladed
chisel in between the intermediate volute and the
pump adapter in two or three places around the
pump to separate the castings (Figure 22). Do not
mar the sealing surfaces; do not break pieces out
of the adapter or volute – the castings are easily
damaged.
12
Figure 18
Figure 19
Figure 20
Figure 21
Figure 22

MAINTENANCE
11. Remove the intermediate volute and slide the im-
peller spacer off of the shaft.
12. Removetheimpeller. Don’t disturb theshaftkeys if
you are only replacing the seal.
13. Rotate the seal spring retainer cup so that the slot
lines up with the shaft keys; remove the cup and
spring.
14. Remove the two cap screws holding the adapter
bracket to the motor.
15. With two screwdrivers on opposite sides of the
pump, carefully pry the pump adapter away from
the motor. This will pull the seal off of the motor
shaft. Use caution to make sure that the ceramic
seal does not dig into the shaft and scratch the
shaft’s sealing surface.
Installation Of New Seal
1. Clean all gasket surfaces thoroughly before re-
assembly. Clean the seal bore cavity in the pump
adapter.
2. Wettherubberseatring withsoapywaterandpush
thestationary partoftheseal into the seal bore cav-
ity. Use a piece of 1” pipe pressing on a cardboard
washer (to prevent damaging seal surface) as a
press. Make sure that the seal half is fully seated
in the seal bore cavity. Removethecardboardonce
the seal is in place.
3. Make sure that the shaft keys are in place on the
shaft. If they are not, squeeze them in place now
with slip joint pliers. Do not tap them or hit them
with a hammer; you could bend the shaft (see
Figure 23). When the keys are correctly installed,
the adapter will pass over the keys without inter-
ference.
4. Carefully slide the adapter over the shaft (see
Figure24).Donot damagetheshaftsealingsurface;
itishighlypolishedand anyslightscratchesornicks
will ruin it.
5. Using the alignment marks made before disassem-
bly, line up the adapter with the motor and bolt the
adapter in place. Tighten the cap screws evenly.
6. Push the shaft seal and seal spring onto the shaft,
after making sure that the seal faces and shaft are
clean. Take care that the shaft shoulder does not
damage the carbon seal face. Follow the seal
spring with the spring holder; compress the spring
and give the spring holder a quarter turn to lock it
under the first shaft key (see Figure 25).
7. Slide the first impeller onto the shaft; follow it with
the impeller spacer. Twist the impeller on the shaft
to make sure that the shaft key is still in place and
the impeller is locked to the shaft (the shaft should
turn with the impeller).
8. Install a new volute gasket, lining up the bolt holes
with the bolt holes in the adapter. Make sure the
gasket is right side up so that the water passage
holes line up with the water passages in the vo-
lutes.
13
Use pliers –
with care –
no hammers.
Figure 23
Align
Marks
Figure 24
Figure 25

MAINTENANCE
9. Install the intermediate volute, aligning it with the
mark made before disassembly. Use the long cap
screws to check this alignment. It cannot be
stressed too strongly that all bolt holes and water
passages of all gaskets and volutes MUST line up
with each other, or the pump will not be assem-
bled correctly.
10. Make sure the second shaft key is in place and in-
stall the second impeller. Twist the impeller to
make sure that the shaft key is still in place. Hold
the motor shaft with slip-joint pliers or vice-grips
and install and tighten the impeller locknut.
Tighteningthelocknutautomaticallyspacestheim-
peller correctly. Do not overtighten.
11. Install the base volute gasket. Make sure the gasket
is right side up so that the water passage holes line
up with the water passages in the volutes. Install
the base volute, using the alignment marks made
before disassembly. Make sure that the pump dis-
charge will correctly meet the the piping when the
pump is reinstalled.
12. Insert the four base capscrews and tighten evenly
(seeFigure26).Theseshould beeasy toinstall ifev-
erything is correctly aligned. If not, don’t force
them; go back over your work and find and cor-
rect the misalignment.
13. Reinstall the pressure switch barb fitting and pres-
sure tube.
14. Reinstallthepumpontheadapterflange(use anew
gasket) and reconnect the wiring and grounding.
Pump is now ready for operation.
14
Make sure
all marks
line up.
Bolts should
be easy to
insert.
Figure 26

TROUBLESHOOTING CHART
15
SYMPTOM
Motor will not run
Motor runs hot and
overload kicks off
Motor runs but no
water is delivered
*(Note: Check
prime before look-
ing for other
causes. Unscrew
pressure gauge
and see if there is
water in priming
hole)
Pump does not de-
liver water to full
capacity (Also
check point 3 im-
mediately above)
Pump pumps water
but does not shut
off
Pump cycles too
frequently
Air spurts from
faucets
POSSIBLE CAUSE(S)
1. Disconnect switch is off
2. Fuse is blown
3. Starting switch is defective
4. Wires at motor are loose, discon-
nected, or wired incorrectly
5. Pressure switch contacts are dirty
6. Wrong voltage
1. Motor is wired incorrectly
2. Voltage is too low
3. Pump cycles too frequently
*1. Pump in a new installation did not
pick up prime through:
a. Improper priming
b. Air leaks
c. Leaking foot valve
*2. Pump has lost its prime through:
a. Air leaks
b. Water level below suction of
pump
3. Ejector or impeller is plugged
4. Check valve or foot valve is stuck
in closed position
5. Pipes are frozen
6. Foot valve and/or strainer are
buried in sand or mud
1. Water level in well is lower than es-
timated
2. Steel piping (if used) is corroded or
limed, causing excess friction
3. Offset piping is too small in size
1. Pressure switch is out of adjust-
ment or contacts are “frozen”
2. Faucets have been left open
3. Ejector or impeller is clogged
4. Water level in well is lower than es-
timated
5. Wrong voltage
1. Standard pressure tank is water-
logged and has no air cushion
2. Pipes leak
3. Faucets or valves are open
4. Foot valve leaks
5. Pressure switch is out of adjust-
ment
6. Air charge too low in Captive-Air®
tank
1. Pump is picking up prime
2. Leak in suction side of pump
3. Well is gaseous
4. Intermittent overpumping of well
CORRECTIVE ACTION
1. Be sure switch is on
2. Replace fuse
3. Replace starting switch
4. Refer to instructions on wiring. Check and tighten all
wiring.
5. Clean by sliding piece of plain paper between contacts
6. Make sure motor voltage exactly matches power supply
voltage.
1. Refer to instructions on wiring
2. Check with power company. Install heavier wiring if wire
size is too small. See wiring instructions.
3. See section below on too frequent cycling
1. In new installation
a. Re-prime according to instructions
b. Check all connections on suction line, air volume con-
trol, and ejector
c. Replace foot valve
2. In installation already in use:
a. Check all connections on suction line, air volume con-
trol, ejector and shaft seal
b. Lower suction line into water and re-prime. If receding
water level in a shallow well operation exceeds suction
lift, a deep well pump is needed.
3. Clean ejector or impeller; see Maintenance
4. Replace check valve or foot valve
5. Thaw pipes. Bury pipes below frost line. Heat pit or pump
house.
6. Raise foot valve and/or strainer above well bottom
1. Lower ejector in well
2. Replace with plastic pipe where possible, otherwise with
new steel pipe
3. Use larger offset piping
1. Adjust or replace pressure switch
2. Close faucets
3. Clean ejector or impeller
4. Check possibility of using a deep well jet pump
5. Make sure motor voltage exactly matches power supply
voltage.
1. Drain tank to air volume control tapping. Check air volume
control for defects. Check for air leaks at any connection.
2. Check connections
3. Close faucets or valves
4. Replace foot valve
5. Adjust or replace pressure switch
6. Disconnect electrical power and open faucets until all
pressure is relieved. Using automobile tire pressure
gauge, check air pressure in tank at the valve stem lo-
cated at top of tank. If less than the pressure switch cut-in
setting, pump air into tank from outside source until the air
pressure is the same as cut-in setting of switch. Check air
valve for leaks, using soapy solution, and replace core if
necessary.
1. As soon as pump picks up prime, all air will be ejected
2. Check suction piping
3. Change installation, see Maintenance
4. Lower foot valve if possible, otherwise restrict discharge
side of pump

REPAIR PARTS
16
20 100
80
60
40
9
10
13
4
5
6
7
8
2
11 17
16
15
14A
14A
14B
14B
14C
13
14
18
1281 0994
12
12
2080 1095
1
1B
1A
2A 2B
2C 2D
5
4
6
2E 2F
2
3
789
10
20 100
80
60
40
Pressure
Regulator
Multi-Stage
Jet Pump
Model
390.253250

REPAIR PARTS
17
To Order Parts,
Call Sears Product Service,
1-800-366-7278
Model Number
390.253250
Key 1 HP Part
No. 115/230V/60Hz Description
1** J218-600C Motor
2 L43-5C Connector
3 U36-112ZP Locknut - 1/2”
4 U217-1228 Pressure Switch
5 U37-672P Switch Tube - 14-1/2”
6 J212-24A Pressure Regulator Assembly
7 L2-16 Adapter
8 U30-75ZP Capscrew - 3/8”-16x1-1/4” Lg. (2 Req.)
9 U65-15SS Shaft Key (2 Req.)
10 U109-99 Seal - Shaft
11 J24-11 Spring Holder
12 J105-76P Impeller (2 Req.)
13 J43-23 Spacer - Impeller
14 J101-26 Intermediate Volute w/Wear Rings
14A J20-11 Gasket (2 Req.)
14B J23-10 Wear Ring (2 Req.)
14C J23-11 Wear Ring
15 U36-175D Impeller Nut
16 J101-33 Base Volute w/Wear Ring
17 U78-57CT Pipe Plug - 1/4” NPT
18* U30-82ZP Capscrew - 3/8”-16x4-1/4” Lg. (4 Req.)
• F642-9502 Owner's Manual
Key Part Numbers
No. J212-24A Part Description
1 J112-14 Pressure Regulator Body w/Seat
1A U111-212T Barbed Fitting - Elbow
1B J66-16 Valve Seat
2 J220-16B Diaphragm Assembly
2A J42-5 Regulator Guide
2B J62-9 Stem
2C J20-16 Diaphragm
2D J43-31 Spring Follower
2E U43-23ZP Lock Washer
2F U36-36ZP Nut 1/4-20
3 U78-107DT Reducer Bushing 1/2x1/8 NPT
4 U239-3 Pressure Gauge 0-100#
5 J24-13 Spring
6 J61-5 Spring Guide
7 J52-9 Bonnet
8 U30-60ZP Capscrew 5/16-18x3/4” Lg. (4 Req.)
9 U30-69FTZP Adjusting Screw 5/16-18x2”
10 U36-37ZP Locknut 5/16-18
Repair Parts List - Multi-Stage Jet
Repair Parts List - Pressure Regulator
* Standard hardware item; may be
purchased locally.
** Not mailable; specify freight or ex-
press.
• Not illustrated.
For repair or service to motors, always
give the Motor Model number and any
other data found on the motor model
plate.
This is a repair parts list, not
a packing list. Please order
by part number – not by key
number.

REPAIR PARTS
18
To Order Parts,
Call Sears Product Service,
1-800-366-7278
Key J216-13 J216-14
No. 2” 3” Part Description
1 U30-282ZP U30-282ZP 3/8-16x5” Long Machine Bolt (2 Req.)
2 J16-19ZZP J16-23ZZ Upper Flange
3 J21-19 J21-19 Seal Ring – Drive Pipe
4 J21-18 J21-18 Seal Ring – Suction Pipe
5 J51-1ZZP J51-3ZZ Casing Adapter Body
6 U30-277ZP U30-277ZP 3/8-16x2-1/2” Hex Hd. Bolt (3 Req.)
7 J21-17 J21-21 Seal Ring – Lower
8 J16-20ZZP J16-24ZZP Lower Flange
9 U36-38ZP U36-38ZP 3/8” Hex Nut (3 Req.)
Key Model
No. 390.253250 Part Description
1 J20-12 Adapter Gasket
2 J2-17B Adapter – 1-1/4”x1-1-1/4” NPT
3* U30-86PS 1/2-13 x1-1/4” Long Capscrew (2 Req.)
Repair Parts List - Casing Adapters
Repair Parts List - Adapter Flange
Sears Vertical Casing Adapters and Adapter Flanges
for Multi-Stage Jet Pump
1
2
3
489 0194
1
2
3
4
5
6
7
8
9
Adapter Flange Casing Adapter
* Standard Hardware Item, may be purchased locally.

REPAIR PARTS
19
29670 29902 29660
Key 2” Single 3” Single 4” Double Part
No. Pipe Jets Pipe Jets Pipe Jets Description
1 J32P-24 J32P-24 J32P-24 Venturi
1 J32P-18 J32P-18 J32P-18 Venturi
2 J34P-42 J34P-42 J34P-42 Nozzle
3 J40-24 J40-25 N40-92 Jet Body
4 J57-1 J57-3 – Packer Leathers (2 Req)
5 J43-14P J43-16 – Spacer
6 – J43-20C – Washer
7 P122-10B J161-3 N212-12P Check Valve
8 J66-13 J66-14 – Valve Seat
9 U11-1 – – Turned Coupling (11 included)
10 J37-4 J37-4 – 1” NPT Offset Nipple
11 – – L8-1P Strainer
12 – – U11-104P Plastic Pipe Adapter
• J216-13 J216-14 – Casing Adapter
• U37-116GP U37-116GP – 1” x 6” T.O.E. Nipple
Max. Depth with Jet Package No.
29670 29902 29660
Pump Venturi 2” Single 3” Single 4” Double
Model HP Installed Pipe Pipe Pipe
390.253250 1 J32P-24 90’ 100’ 100’
J32P-18 180’ 210’ 210’
1320 1094
Suction Pipe: 1-1/4"
Drive Pipe: 1"
Adapter
1" Pipe
Adapter
Well Seal
Steel Nipple
Coupling
Adapter
41
JET NO. J32P- 24
1
11
3
7
10
2
1361 1094
41
JET NO. J32P- 24
1
2
3
4
5
4
6
7
8
1359 1094
41
JET NO. J32P- 24
1360 1094
9
10
Drop
Pipe
Well
Casing
Jet Packages
2” and 3” Single Pipe Jets 4” Double Pipe Jets
Repair Parts List – Jet Packages
Venturi Selection Chart
• Not illustrated.
11
12
1
2
3
7

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.
390.253250
The model number of
your Multi-Stage 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
MULTI-STAGE
JET PUMP