Sears 390.250095 User manual

OWNER’S
MANUAL
MODEL NO.
390.250095
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
• Maintenance
• Repair Parts
PRINTED IN U.S.A.
1/2 HP SHALLOW WELL
WATER SYSTEM
Form No. F642-9608 (Rev. 7/16/97)
FOR POSITION ONLY

2
CONTENTS
INTRODUCTION/WARRANTY..................................2
PUMP PERFORMANCE...............................................3
MAJOR COMPONENTS..............................................4
INSTALLATION........................................................4-5
ELECTRICAL...............................................................6
OPERATION...............................................................6
MAINTENANCE.....................................................7-10
HELPFUL HINTS.......................................................10
TROUBLESHOOTING GUIDE ..................................11
REPAIR PARTS .....................................................12-14
INTRODUCTION
Please read our instructions before installing and using
yourShallowWell WaterSystem. Thiswill helpyouob-
tain the full benefits of the quality and convenience
built into this equipment. It will also help you avoid
anyneedlessservice expenseresulting fromcausesbe-
yond our control which are not covered by our war-
ranty.
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.
Neverrun pump dry.Running pumpwith-
out water may cause pump to overheat, damaging seal
and possibly causing burns to persons handling pump.
Fill pump with water before starting.
Never run pump against closed dis-
charge. To do so can boil water inside pump, caus-
ing hazardous pressure in unit, risk of explosion
and possibly scalding persons handling pump.
Motor normally operates at high temper-
ature and will be too hot to touch. It is protected from
heatdamageduring operationbyan automaticinternal
cutoff switch. Before handling pump or motor, stop
motor and allow to cool for 20 minutes.
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;
install relief valve capable of passing full
pump volume 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.
FULL ONE YEAR WARRANTY ON PUMP
For one year from the date of purchase, Sears will repair or replace well pump, free of charge, if defective in material or workmanship.
LIMITED WARRANTY ON SEARS HYDRO-GLASS®PUMP
After one year and through two years from the date of purchase, Sears will furnish, free of charge, a replacement part for any defective part. You pay for
labor.
This warranty does not cover repairs or replacement parts necessary because of abuse or negligence including failure to install, adjust and operate this
well pump according to the instructions in the owners manual.
FULL FIVE YEAR WARRANTY ON CAPTIVE AIR®TANK
For five years from the date of purchase, Sears will replace the tank free of charge, if defective in materials or workmanship. This warranty does not cover
repairs or replacement parts necessary because of abuse or negligence, including failure to install, adjust and operate this tank according to the instruc-
tions in the owners manual.
SEARS WILL NOT BE LIABLE FOR LOSS OR DAMAGE TO PROPERTY OR ANY INCIDENTAL OR CONSEQUENTIAL 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 exclusion may not apply to you.
WARRANTY SERVICE IS AVAILABLE BY SIMPLY CONTACTING THE NEAREST SEARS SERVICE CENTER/DEPARTMENT 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
READ AND FOLLOW SAFETY INSTRUCTIONS!

3
SAFETY INSTRUCTIONS (Continued)
2485 0696
To Household
Water System
Pump Priming
Plug
From Well
Check Valve
Priming Tee
and Plug
Pressure
Switch
Pump Discharge Pumping Depth in Feet
Model Description Suct. Disch. Pressure PSI 5’ 10’ 15’ 20’
390.250095 1/2 HP S.W. Jet 1-1/4” 3/4” 40 7.3 6.2 5.2 4.2
TABLE I
Pump Performance (In Gallons per Minute)
NOTE: This system is designed for pumping depths of 20 feet or less.
Plastic Pipe
Plastic Pipe
Foot Valve
and Strainer
Coupling
Well Seal
Dug or Cased Well
611 1293
Figure 1 – Connections to water system
Figure 2A – Driven point Figure 2B – Dug or cased well
Check Valve
Steel Drive Pipe
Drive coupling
Driven point
6. Disconnect electrical power source before in-
stalling or working on pump.
7. Groundpumpwithagroundwirerunfromground-
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.
Well point

4
MAJOR COMPONENTS AND
WHAT THEY DO
Impeller and Jet
Impeller turns with motor shaft, causing water to fly
out from its rim by centrifugal force. Impeller rotation
createsavacuumwhichpullsinmorewater. Partof the
water is diverted back to the jet where it passes
through the nozzle and venturi. This creates more vac-
uum to draw in more water.
In shallow wells (less than 20 feet deep), the vacuum
created at the pump is enough to pull water to the
pump. Therefore, for shallow well use the jet is built
into the pump.
Pre-Charged Tank
The tank serves two functions. It provides a reservoir
of water under pressure and maintains a cushion of air
pressureto preventpipehammeringand possibledam-
agetoplumbingcomponents.When waterisdrawnoff
through the house fixtures, the pressure in the tank is
lowered and the pump starts.
Pressure Switch
The pressure switch provides for automatic operation.
Pump starts when pressure drops to 30 pounds and
stops when pressure reaches 50 pounds.
Check Valve or Foot Valve
This pump is equipped with a built-in check valve.
Install a check valve as close to well as possible on
well point installations. A foot valve must be installed
in the well on dug or cased wells. See Figures 2A and
2B.Forlonghorizontalpiperuns,install checkvalveas
close to well as possible (all types of wells).
INSTALLATION
Piping in the Well
The Sears 1/2 HP Shallow Well Water System can be in-
stalledona dugwell,casedwellorwitha drivenpoint.
In a dug or cased well, a foot valve and strainer should
be installed for easy priming. It should be installed five
to ten feet below the lowest level to which the water
willdropwhilethe pumpisoperating(pumping water
level). To keep sediment from clogging the strainer, be
sure it is five to ten feet above the bottom of the well.
Beforeinstalling the footvalve,make surethat it works
freely.
When using a foot valve, a priming tee and plug as
shown in Figure 1, Page 3, are recommended.
When installed on a driven point well, your Shallow
Well Water System should have a check valve installed
as shown in Figure 2A, Page 3.
Forapump atsea levelmounted directlyoverthewell,
be sure the total lift from the pumping water level to
the pump does not exceed 20 feet. This will be less if
the pump is offset from the well.
The maximum lift of any pump decreases at the rate of
about 1’ less lift for every 1,000 feet of elevation above
sea level. For example, at Denver, Colorado (Elev.
5,000’) the pump loses five feet of lift. The maximum
depth from which it would pump water would there-
fore be 15 feet.
PUMP/TANK INSTALLATION
Pump
NOTICE: Use Teflon tape supplied with the pump or
Plasto-JointStik1formakingall pipe-threadconnections
to the pump itself. To avoid stress-cracking, do not use
pipe joint compounds on the pump.
1Lake Chemical Co., Chicago, Illinois
BASIC TOOLS AND MATERIALS NEEDED
Plastic Pipe Installation
Tools Materials
Pipe Wrenches Plastic Pipe and Fittings (as required to complete job).
Screwdriver
Knife or Saw to Cut Plastic Pipe Teflon Tape (DO NOT use joint compound on plastic fittings).
Tire Pressure Gauge
Galvanized Steel Pipe Installation
Tools Materials
Pipe Wrenches Galvanized Pipe and Fittings (as required to complete job).
Screwdriver
Pipe Cutting and Threading Tools Pipe Joint Compound or Teflon Tape
Tire Pressure Gauge

INSTALLATION
5
1. Wrap male pipe threads being attached to pump
with one or two layers of Teflon tape. Cover entire
threaded portion of pipe.
2. Do not overtighten threaded fittings in the plastic
pump. Be sure you do not try to tighten joint past
thread stop in pump port!
3. If leaks occur, remove fittings, clean off old tape,
rewrapwith twoto three layers of tapeand remake
the connection. If joint still leaks, replace the fit-
tings (fittings may be undersized).
4. Be sure to support all piping connected to the
System.
Horizontal Piping from Well to Pump
When the pump is offset more than 25 feet from the
well, horizontal suction pipe size should be increased
to reduce friction losses. Never install a suction pipe
that is smaller than the suction tapping of the pump.
1-1/4” 1-1/2” 2”
Up to 25 Ft. 25 to 50 Ft. 50 to 200 Ft.
Discharge Pipe Sizes
When the pump is some distance from the house or
point of water use, the discharge pipe size should be
increased to reduce pressure losses caused by friction.
1” 1-1/4” 1-1/2”
Up to 25 Ft. 25 to 100 Ft. 100 to 600 Ft.
Tank
Tank is pre-charged with 30 PSI air pressure at the fac-
tory. Your tank requires an air charge of 30 pounds per
square inch (PSI) for proper operation; check tank
pressure with tire gauge to determine if air charge
needs adjustment. Tank pre-charge should be checked
annually; see instructions at right.
In areas where the temperature is high for long peri-
odsoftime, thetankpre-chargepressuremayincrease.
This may reduce the tank drawdown (amount of water
available per cycle). If this occurs, reduce the pre-
charge pressure to two PSI below the pump cut-in set-
ting of the pressure switch (normally to 28 PSI).
It is necessary to flush all air out of the piping system
and water reservoir portion of the pre-charged tank.
This is required on new installations, pumps requiring
repriming and pumps that have been disassembled for
service. Do this as follows:
1. Openfaucetsfurthest fromtankandallowpumpto
operate.
2. Airin thesystem willcause asputtering flow;allow
faucets to run until you have a steady, air free
stream.
3. Open and close faucets repeatedly until you are
sure all air has been removed.
4. If stream does not become steady, air may be leak-
ingintothe system; checkforleaksinthe pipingon
the suction side of the pump.
NOTICE: To prevent waterlogging, check tank air
charge annually.
To Check Tank Air Charge
If drawdown (amount of water available per cycle) de-
creases significantly, check as follows:
1. To check air charge in tank, shut off electric power
to pump, open faucet near tank, and drain com-
pletely.
2. At the air valve in top of tank, check air pressure
with standard tire gauge. Air pressure should be
same as pump pressure switch cut-in setting (30
PSI).
3. Iftheairpressureisbelowthecut-in setting,addair
to the tank. Use an air compressor or a portable air
storage tank.
4. Use soap or liquid detergent to check for air leaks
around air valve. Continuous bubbling indicates a
leak. If necessary, install new core in air valve. This
is the same as those used for automobile tubeless
tires.
H20
H20H20
612 1293
1234 5
1. Tank nearlyempty–air expandsfillingareaabove
vinyl separator.
2. Water begins to enter tank – air is compressed
above separator as it fills with water.
3. Pump-up cycle completed – air now compressed
to cut off setting of pressure switch.
4. Water being drawn from tank – compressed tank
air forces water out of separator.
5. Separatorcompletelyempty –new cyclereadyto
begin.
Figure 3
Water Water Water

Disconnect power at service panel
before connecting pressure switch.
Figure 4 – 115/230 volt motor wiring connections
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.
Risk of serious or fatal
electrical shock.
Connect motor ground
wire before connecting
power supply wires.
Do not ground to a gas sup-
ply line.
Turn off power before
working on pump or
motor.
Match motor voltage and power supply voltage.Supply
voltage must be within ±10% of motor nameplate voltage.
Incorrect voltage can cause fire or seriously damage motor
and voids warranty. If in doubt, consult a licensed electri-
cian.
Use wire size specified in wiring chart. If possible, con-
nect pump to a separate branch circuit with no other appli-
ances on it.
1. Install, ground, wire and maintain pump in accordance
with your local electrical code and all other codes/ordi-
nances that apply. Consult your local building inspector
for code information.
2. Connect ground wire first as shown at left. Ground wire
must be a solid copper wire at least as large as power
supply wires.
•There must be a solid metal connection between
pressure switch and motor to provide motor ground-
ing protection. If pressure switch is not connected to
the motor, connect ground screw in switch to motor
groundscrew.Usea solidcopper wireat leastas large
as power supply wires.
•Connect ground wire to grounded lead in service
panel, metal underground water pipe, well casing at
least 10’ (3M) long, or to ground electrode provided
by power company.
3. Connect power supply wires as shown at left.
4. Replace pressure switch cover before turning on power
to pump.
ELECTRICAL
OPERATION
Priming the Pump
NOTICE: To prevent damage to internal parts, do not
start motor until pump has been filled with water.
To prime pump:
1. Remove priming plug (Figure 1, Page 3).
2. Fill pump with water.
3. Replace priming plug, using Teflon tape or Plasto-
Joint Stik2on plug threads; tighten plug.
4. Start the pump. Water should be pumped in 1-2
minutes. If not, repeat steps 1, 2 and 3.
On shallow depths to water (10 feet or less), the
pump will probably prime the first time after fol-
lowing steps 1 through 4 above.
From 10 to 20 foot depths, you might have to shut
off the pump and repeat steps 1, 2 and 3 several
times.
5. If, after priming pump several times, no water is
pumped, check the following:
A. Be sure suction pipe is in the water.
B. Be sure suction pipe does not leak.
C.Be sure that pump is not trying to lift water too
high (see “Piping in the Well”, Page 4).
D.As long as foot valve and check valve function
correctly and suction pipe does not develop
leaks, pump should not need repriming in nor-
mal service.
2Lake Chemical Co., Chicago, Illinois
6
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 Clamp
power
cable to
prevent
strain on
terminal
screws.
White w/
Black Tracer
Black
Motor Ground
Screw
Connect green (or bare copper) ground
wire to green ground screw.
Motor wires
are connected
to these two
brass screws.
2263 0196
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.
Your pressure switch may look like this.
If so, connect the black and white power
supply wires to the
outside terminals.
Motor wires are connected to the two
center terminals.
Connect green (or bare copper) ground
wire to green ground screw.

ELECTRICAL
MAINTENANCE
Lubrication
It is not necessary to lubricate the pump or its motor.
The motor bearings are lubricated for life. The me-
chanical shaft seal in the pump is water lubricated and
self-adjusting.
Draining for Winter
Risk of electric shock. Disconnect
power before working on unit.
Pump should be drained whenever it is disconnected
from service or is in danger of freezing.
1. DISCONNECT POWER.
2. Open faucet and relieve all pressure on system be-
fore proceeding.
3. Disconnect pressure switch tube (Key No. 15, Page
12) at barbed elbow on pressure switch (Key No.
26) and allow tube to drain.
4. Unscrew barbed elbow (Key No. 14) from pump
bodyandallowpump todrain.Ifnecessaryto drain
completely, tilt pump.
5. Remove priming plug to vent pump; disconnect
hose (Key No. 6, Page 14) at tank end and drain
pressure tank and all piping to a point below the
frost line.
6. Besure todrain any pipingthat maybecut off from
normal system draindue tocheckvalveinstallation.
Vinyl Bag Replacement
Be sure ALL air pressure has been re-
leased from tank before removing nuts from
flange. Failure to do this may result in serious or
fatal injury. Do not attempt to open tank unless
all pressure has been relieved!
Risk of electric shock. Disconnect
power before working on unit.
1. DISCONNECT POWER TO PUMP.
2. Drain system as follows:
A. Open faucet closest to tank.
B. Remove hose (Key No. 6, Page 14) from tank
elbow.
3. Relieve (expel) ALL air pressure in system by re-
moving valve core.
4. Disconnect outside piping from tank and pump.
To avoid serious or fatal injury, be
sure all air pressure has been released from
tank before proceeding to step 5.
5. Removenuts frominletflange(KeyNo.2,Page14).
Tap inlet flange to break seal. Remove flange.
6. Wherever convenient, hold bag with pliers and cut
withsingle-edgerazorbladeorsharpknife.Bagwill
not come out in one piece. Continue pulling and
cutting until bag is removed.
7. Clean and dry inside of tank.
8. Place replacement bag on a clean surface with
opening up. Flatten bag and force air out.
9. Tightly roll bag towards center opening.,
10. Before center opening is covered up, force air out
of remaining portion of bag. Finish rolling bag.
11. To make bag easier to insert into tank, sprinkle out-
side of bag with talcum powder.
12. Being careful not to break valve, stand tank on end.
Push tightly rolled bag into tank.
13. Reach into bag and push out sidewalls. You need
not remove all wrinkles.
14. Clean center opening ring on bag and lip on tank.
15. Pull ring on bag through tank opening and fit over
tanklip.BE SUREitseatsproperlyin grooveontank
lip.
16. Clean sealing surface of inlet flange and place on
studs.
17. NOTICE: Tighten nuts as follows:
A. Hand tighten all nuts.
B. Tighten one nut snug.
C.Tighten opposite nut snug.
D.Proceed, tightening opposite pairs to a snug fit.
E. Recheck all nuts, using same pattern. Be sure all
nuts are tight and you have a good seal.
7
Table II Wiring Chart
Recommended Wire and Fuse Sizes
Distance in Feet from Motor to Meter
Branch 0’ 101’ 201’ 301’ 401’
Max. Fuse* to to to to to
Motor Load Rating 100’ 200’ 300’ 400’ 500’
Horsepower Volts Amps. Amps Wire Size
115 9.4 15 14 10 10 6 6
1/2 230 4.7 15 14 14 14 14 12

MAINTENANCE
NOTICE: Do not overtighten; you may twist studs
off of tank. If you have a torque wrench, tighten to
85 inch-pounds torque.
18. Stand tank on feet and reconnect piping.
19. Recharge tank to proper air pressure (see Page 5).
20. Reconnect hoses and pressure switch tube; prime
pump (see Page 6).
Air Valve Replacement
1. Follow steps 1 through 5 under “Vinyl Bag
Replacement”, Page 7.
2. Cut valve off as close to tank as possible. Push re-
maining portion back into tank.
3. Tip tank on end and BE SURE all water is drained
from bag.
4. Carefullyremovebag ring fromlip ontank opening
and push bag ring back into tank; reach in around
it and remove cut off portion of valve from tank.
5. Wipe a thin film of soapy solution on replacement
valve and from inside tank insert in hole in top of
tank.
6. Pull valve through hole with pliers or a valve tool
(available at your local filling station or Automotive
Center).
7. Follow steps 14 through 20 under “Vinyl Bag Re-
moval”, Page 7, to reinstall bag in tank.
Testing for Bag Leakage
1. Follow steps 1 through 4 under “Vinyl Bag
Replacement”, Page 7.
2. Tip tank on end, valve down. Be careful not to
break valve!
3. If bag leaks, water will run out of valve. If so, re-
place bag as instructed above.
DISASSEMBLY AND
ASSEMBLY OF PUMP
Risk of electrical shock. Be sure unit is
grounded and power disconnected before attempting any
work on pump or motor.
Your SEARS pump is designed for ease in servicing. Should
repair or replacement of the motor or seal be needed, the
pump and piping do not need to be disconnected or dis-
turbed.
1. Disassemble pump as follows:
A. Disconnect power.
B. Remove pressure switch tube from pump body and
allow pump to drain.
C. Remove four hexnuts and lockwashers (Key Nos. 24
and 23, Page 12) which hold the pump body to the
motor.
D. Remove motor, seal plate, impeller, rubber pad and
diffuser (Key Nos. 1, 3, 7, 8 and 9, Page 12) as a unit.
Youmayhaveto prygently withtwo screwdriversbe-
tween the motor flange and the pump body to sepa-
rate pump and motor.
2. Reassembly of pump:
A. Install O-Ring gasket on seal plate (Key Nos. 5 and 3,
Page 12).
B. Pickupasmall amountofpetroleumjellyon one fin-
ger and spread evenly over seal plate and venturi O-
Ring gasket for lubrication during reassembly. Be
careful not to nick or tear O-Ring.
C. Replace motor onto pump body; be sure rubber pad
(Key No. 8, Page 12) stays in place on top of diffuser.
Remount base on lower studs. Tighten four hexnuts
and lockwashers snugly (35-45 inch-lbs. torque). Do
not overtighten.
D. Replace pressure switch tubing and motor wiring.
E. Prime pump according to instructions above.
F. Check for leaks.
Removing Motor for Service
and Replacing Shaft Seal
If it is necessary to separate motor and seal plate, always re-
place the shaft seal. We suggest you purchase this item,
Stock No. 2784, and have it on hand for future use.
NOTICE: The seal consists of two parts, a rotating member
and a ceramic seat. The surfaces of the seal are easily dam-
aged. Read instructions carefully.
Remove motor as follows:
1. Disassemble pump per instructions above.
2. Remove diffuser and impeller as follows (Key Nos. 9 and
7, Page 12).
A. Remove screws holding diffuser.
B. Loosen two screws and remove motor canopy from
motor (Key No. 1, Page 12).
C. Place 7/16” open end wrench on motor shaft flat.
D. Turn impeller counterclockwise when facing it.
8

MAINTENANCE
9
3. Remove seal plate from motor by inserting two screw-
drivers between the seal plate and the motor flange. Pry
sealplateoffmotor flange.Thiswillforcerotatingportion
of seal off shaft.
NOTE: Be sure you do not scratch shaft!
See Figures 5 & 6.
4. Place seal plate face down on flat surface and tap out ce-
ramic seat.
NOTICE: Do not force out copper insert. If it has moved,
leakagewill occur. Seesectionon installingcopperinsert on
Page 10.
5. Clean seal cavity.
6. Install new seal.
A. Clean polished surface of ceramic seat with clean
cloth.
B. Wetouter edgeof cupsealwithpetroleumjellyorde-
tergent solution.
C. With finger pressure, press firmly and squarely into
cavity. Polished face of seat faces inside of pump. If
seat will not locate properly, place cardboard washer
overpolishedfaceand usepiece of3/4” standardpipe
for pressing purposes. See Figure 7.
D. Dispose of cardboard washer and clean surface of
seat.
E. Clean motor shaft.
F. Reassemble seal plate to motor flange. BE SURE it is
right side up: index pins should be down; seal plate
is marked at top. See Figures 8A and 8B.
G. Apply detergent solution to inside diameter of rotat-
ing seal member.
H. Sliderotatingmemberon shaft until rubber drive ring
hits shaft shoulder.
NOTE: Be sure you do not chip or scratch seal face
on shaft shoulder or seal will leak!
Figure 5
Figure 6
Figure 7
Figure 8A
Figure 8B

MAINTENANCE
10
I. Screw impeller on shaft (clockwise) while holding
shaft with 7/16” open end wrench on shaft flats. This
will automatically locate seal in place. See Figure 9.
J. Remount diffuser on seal plate. Be sure diffuser is
right side up as follows (see Figures 10 and 11).
a. Rib next to priming hole should be at six o’clock
position;
b. Part number (N1-28P) should be between nine
o’clock and ten o’clock.
c. Both mounting screws must engage screw holes
in seal plate. See Figure 10.
d. Be sure rubber pad (Figure 10; Key No. 8, Page
12) stays in place on top of diffuser.
Installing Copper Insert
NOTE: If the copper insert (Key No. 4, Page 12) moves or
shifts during seal removal, it should be removed and rein-
stalled.
1. Remove copper insert as shown in Figure 12. do not de-
form.
2. Replace copper insert:
A. Clean off surplus Permatex* from around insert cav-
ity. Be careful not to scratch or mark the machined
bore. It is important that this area be clean no no old
Permatexlodgesbehindthe newinsert andcauses im-
proper seating.
B. Place a small amount of No. 2 non-hardening
Permatex on surface of insert as shown. Smooth out
with finger. See Figure 13.
* “Permatex” is a registered trademark of Permatex Co. Inc.
Figure 9
Figure 10
Figure 11
Figure 12

MAINTENANCE / HELPFUL HINTS
C. Pull insert into cavity as shown in Figure 14.
D. Clean out any surplus Permatex from insert cavity
where new seal will be located. See Figure 15.
Cleaning Impeller
1. Follow steps 1A through 1D under “Disassembly and
Assembly of Pump” on Page 8.
2. Removediffuserandimpeller frompump perinstructions
under “Removing Motor for Service and Replacing Shaft
Seal” on Page 8.
3. Clean impeller and reassemble impeller and diffuser per
instructions under “Removing Motor for Serivce and
Replacing Shaft Seal” on Page 8.
Cleaning Shallow Well Jet
To remove debris from venturi or nozzle, proceed as fol-
lows:
1. Disassemble pump per instructions on Page 8.
2. Turn venturi counterclockwise and remove it. The noz-
zle is now exposed. Remove it using a 5/8” hex socket
wrenchwithextension.Turn counterclockwise.If socket
wrench is not available, insert an ice pick or similar
pointed tool carefully into the nozzle. This will dislodge
debris.
3. Flush out the debris by running water through the nozzle
in the same direction as the dislodging tool was inserted.
4. Replace nozzle and venturi. Do not overtighten!
5. Reassemble per pump instructions on Page 8.
HELPFUL HINTS
How to Handle a Gaseous Well
Insomeareaswellwatercontainsgases whichmustbe
allowedto escape beforethewaterisused.This canbe
done as shown in Figure 16.
A good way of delivering gas-free water is to suspend
a pipe, closed at the bottom and open at the top, sur-
rounding the suction pipe. Since the gases rise in the
well casing, the water sucked down through the pipe
and into the suction pipe is free of gas. This type of
well must be vented to the outside of any enclosure.
11
Not
to
Scale
Pipe strap or
wire to hold
pipe sleeve
Pipe
sleeve
Pipe
cap
Tail
pipe
Foot
valve
2369 0396
Gases
rise to
surface
Figure 16
Figure 13
Figure 14
Figure 15
Wipe on small amount of
non-hardening Permatex
on this surface
756 0993
7/8" Socket
Bolt
1-3/8" O.D.
Washer 038 0893
Remove
Surplus
Permatex
Properly
Seated
039 0893

REPAIR PARTS
12
1
2305 0296
AVC
Port
2345678910
11
12 12A 12B
13
14
15
16
17
18
19
20
21
22
23
24
25
26
2728
SEARS 1/2 HP SHALLOW WELL WATER SYSTEM (Pump Only)
Model 390.250095
To Order Parts in the U.S.A., Call
Sears Product Service, 1-800-366-7278
To Order Parts outside the U.S.A., Call
Your local Sears Service Center or Store
L1
L2
1C
1D
Wiring omitted
for clarity
1A 1B

REPAIR PARTS
13
Model 390.250095
Key 1/2 HP Qty.
No. Part Number Used Description
1# J218-953C 1 Motor - 115/230V
1A U18-1103 1 Overload
1B U18-1180 1 Terminal Board
1C U18-1098 1 Contactor
1D U18-128 1 Governor
2 C69-2 1 Water Slinger
3* N203-12P 1 Seal Plate Assembly
4 J3-2 1 Seal Plate Insert
5 U9-390 1 O-Ring
6 2784 1 Shaft Seal
7 J105-40PF 1 Impeller
8 C35-41 1 Rubber Pad
9 N1-28P 1 Diffuser
10 U30-738SS 2 Capscrew #10-16 Hex Head
11** N176-35PE 1 Pump Body Assembly
12 N76-35PE 1 Pump Body
12A U9-226 1 O-Ring
12B N166-5P 1 Check Valve
13† WC78-41T 1 Pipe Plug 1/8” NPT
14† U111-212T 1 90° Hose Barb
15 U37-670P 1 Pressure Switch Tube
16 J20-18 1 Gasket
17 N76-29P 1 Pump Body Jet Insert
18 U30-742SS 4 Capscrew #10-16
19 N34P-19 1 Nozzle #45
20 N32P-66 1 Venturi
21 U9-201 1 O-Ring
22 J104-9F 1 Base Assembly Painted
23† U43-12ZP 4 Lock Washer 3/8”
24† U36-38ZP 4 Nut 3/8” - 16
25 C35-5 1 Rubber Pad
26 2781 1 Pressure switch
27† U36-112ZP 1 Locknut 1/2”
28 L43-5C 1 Connector 1/2”
• F642-9608 1 Owner’s Manual
# For repair or service to motors, always give the motor model number and
any other data found on the motor model plate.
* Includes Key Nos. 4 and 5.
** Includes Key Nos. 12, 12A, 12B, and 16 through 21.
† Standard hardware item, may be purchased locally.
• Not illustrated.

REPAIR PARTS
14
1
3
2
5
5
7
8
9
2433 0596
6
SEARS 1/2 HP SHALLOW WELL WATER SYSTEM (Tank Only)
Model 390.250095
To Order Parts in the U.S.A., Call
Sears Product Service, 1-800-366-7278
To Order Parts outside the U.S.A., Call
Your local Sears Service Center or Store
REPAIR PARTS
Model 390.250095
Key 1/2 HP Qty.
No. Part Number Used Description
1 U231-285-S 1 Tank Assembly (Includes Diaphragm, Valve, Nuts, & Inlet Flange)
• U20-7 1 Bag - Vinyl
• U212-160 † 1 Air Valve with Cap
2 U131-146 1 Inlet Flange
3 U36-37PS † 6 Nut 5/16-18 Hex
4 U78-916P † 1 Elbow 3/4” FPT x 1” Insert
5 U19-55SS 2 Clamp
6 U74-37X 1 Hose - 1” x 23”
7 U78-972P 1 Discharge Tee with Barb
8 U78-107PT† 1 1/2” x 1/8” NPT Reducer Bushing
9 WC78-41T 1 1/8” NPT Pipe Plug
• Not illustrated. † Standard hardware item, may be purchased locally.

TROUBLESHOOTING GUIDE
15
TROUBLE POSSIBLE CAUSES REMEDIES
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, 4. Refer to instructions on wiring
disconnected, or wired incorrectly
5. Motor is wired incorrectly 5. Refer to instructions on wiring
6. Pressure switch contacts are dirty 6. Clean by sliding piece of plain paper between contacts
Motor runs hot and *1. Motor is wired incorrectly 1. Refer to instructions on wiring
overload kicks off 2. Voltage is too low 2. Check with power company. Install heavier wiring
if wire size is too small. See wiring instructions
3. Pump cycles too frequently 3. See section below on too frequent cycling
Motor runs but no *1. Pump in a new installation did 1. In new installation:
water is delivered not pick up prime through:
a. Improper priming a. Re-prime according to instructions
b. Air leaks b. Check all connections on suction line and jet
c. Leaking foot valve c. Replace foot valve
*2. Pump has lost its prime through: 2. In installation already in use:
a. Air leaks a. Check all connections on suction line, jet and shaft seal
b. Water level below suction of pump 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. Jet or impeller is plugged 3. Clean jet or impeller according to instructions
4. Check valve or foot valve is stuck 4. Replace check valve or foot valve
in closed position
5. Pipes are frozen 5. Thaw pipes. Bury pipes below frost line. Heat pit or
pump house
6. Foot valve and/or strainer are 6. Raise foot valve and/or strainer above well bottom
buried in sand or mud
Pump does not 1. Water level in well is lower than 1. A deep well jet pump may be needed (over 20 ft. to water)
deliver water to full estimated
capacity (also check 2. Steel piping (if used) is corroded or 2. Replace with Plastic Pipe where possible, otherwise with
point 3 immediately limed, causing excess friction new steel pipe
above) 3. Offset piping is too small in size 3. Use larger offset piping
Pump pumps water 1. Pressure switch is out of adjustment 1. Adjust or replace pressure switch
but does not shut off or contacts are “frozen”
2. Faucets have been left open 2. Close faucets
3. Jet or impeller is clogged 3. Clean jet or impeller
4. Motor is wired incorrectly 4. Refer to instructions on wiring
5. Water level in well is lower than 5. Check possibility of using a deep well jet pump
estimated
Pump cycles too 1. Pipes leak 1. Check connections, replace pipe fittings
frequently 2. Faucets or valves are open 2. Close faucets or valves
3. Foot valve leaks 3. Replace foot valve
4. Pressure switch is out of adjustment 4. Adjust or replace pressure switch
5. Air charge too low in 5. Disconnect electrical power and open faucets until all
Captive Air® Tank pressure is relieved. Using automobile tire pressure
gauge, check air pressure in tank at the valve stem
located at top of tank. If less than 30 pounds, pump air
into tank from outside source, until 30 pounds pressure
is reached. Check air valve for leaks, using soapy
solution, and replace core if necessary
Air spurts from 1. Pump is picking up prime 1. As soon as pump picks up prime, all air will be ejected
faucets 2. Leak in suction side of pump 2. Check suction piping, make sure joints are not sucking air
3. Well is gaseous 3. Change installation as described in manual
4. Intermittent over-pumping of well 4. Lower foot valve if possible, otherwise restrict discharge
side of pump
(*Note: Check
prime before look-
ing for other
causes. Unscrew
priming plug and
see if there is water
in priming hole)

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.
390.250095
The model number of
your Shallow Well Water
System 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
1/2 HP SHALLOW WELL
WATER SYSTEM