Craftsman 390.253250 User manual

MODELNO.
390.253250
CAUTION:
Read and Follow
All Safety Rules and
Operating Ins_rucfians
Before FirstUse of
This Product.
Save This Manual For
FutureReference.
ULTra-STAGEJET PU
•Safety Instructions
.Installation
.Electrical
•Operation
.Maintenance
.Repair Parts
P
Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A.
PRINTED IN U.S.A. Form No. F642-9S02 (Rev. 6/20/97)

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
UNTRODUCTION
Please read our instructions before installing and using
your Deep Well Jet Pump. This will help you obtain the
full benefits of the quality and convenience built into
this equipment. It will also help you avoid any needless
service expense resulting from causes beyond our con-
trol which are not covered by our warranty.
FULL ONE YE&R W&R_NTY ON PUMPS
For one yearfrom the dateof purchase,Searswillrepair or replacethispumpfree of charge, if defective in material or work-
manship,
This warrantydoes not cover repairsor replacementparts necessary becauseof abuse, negligenceincludingfailureto install,
adjust and operatethis pumpaccordingto the instructionsin the owners manual.
LIMITATION OF LIABILITY
SEARS WILLNOT BELIABLEFOR LOSS ORDAMAGETOPROPERTYORANY INCIDENTALORCONSEQUENTIALLOSS
OR EXPENSEFROM PROPERTYDAMAGE DUE DIRECTLYORINDIRECTLYFROM THE USE OF THISPRODUCT.
Some states do not allowthe exclusionor limitationof incidental or consequentialdamages, sothe above limitationor exclu-
sion may notapplyto you,
WARRANTYsERvIcE IS AVAILABLE BY SIMPLY CONTACTING THE NEARESTSEARS SERVICE CENTER!DEPART.
MENT IN THE UNITEDSTATES ofAMERICA, Forservice outsidethe U.S.A. contactyourlocal SearsServiceCenter or store.
This warrantygives you specific legalrights, and you may also haveother rightswhich vary from stateto state.
Sea_, Koebuck and Co., Dept. 817 WA, Hoffman Est.ates, mL60|79
P,ULES FOP, SAFE iNSTALLATiON AND OPEPJ ,THON
Carefully read and follow all safety instructions in this
manual or on pump
_k 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 ff
ignored.
[&WARNING] Warns about hazards that will or can
cause serious personal injury, death or major property
damage if ignored.
[& CAUTION] Warns about hazards that will or can
cause minor personal injury or property damage ff 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. Keep well covered while installing pump to prevent
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.
[&WARNINGJ TO avoid serious injux T 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.
]AWARNING]Hazardous voltage. Can shock, burn,
cause death, or start fires.
6. Disconnect electrical power source before in-
stalling or working on pump.
7. Ground pump with a ground wire run from ground-
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. Use of fuses or wire smaller than size recommended
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).

MAJOR COMPONENTS AND WHAT THEY DO
Tank and Air Volume Control
The tank serves two tractions:
1. It provides a reservoir of water. Some of this water
is drawn offwhenever a house fixture is opened (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
well which drives water up to the pump from the 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
most efficient operation. Under certain 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 ReliefValve
Under certain conditions, VMS pumps can generate
very high pressure. The pressure relief valve is installed
to make sure that the pressure in the system does not
exceed the pressure which the system can carry safely.
The pressure relief valve must be able to pass all the
water the pump can produce at the system's rated pres-
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.
In the case 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
pressure or drive pipe; this pipe sends water down into
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.
Use a 'single pipe' system for a 2" or 3" well; use a '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"xl" 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.)

PUMP PERFORMANCE
Multi-Stage Pump
Pump Performance (in gallons per minute)
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
29670* 40 11.3 10.0 8.8 7.6 6.5 5.0 5.0 5.0 4.2 3.5 2.0
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 29902"*t 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 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
29660*'** 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
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
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.
1" Must be ordered through Sears Product Service, 1-800-366-7278.
4

RNSTALLATION
Do not use on shallow wells!
(25 feet or less in depth)
Use New Pipe for Best Results.
Body _ Clean Flow!
1096 0697
From
Well
Figure I = No Dirt or Scale in Suction Pipe
1100 0697
Figure 2=Foot Valve Must Work Freely
If Air Pockets Form, Water Won't Flow.
Keep Pipe Straight and Angled up to Pump.
Figure 3- No Air Pockets in Suction Pipe
Pipe Joint
No Air Leaks Compound Will
in Suction Pipe. Plastic.
If Air Flows
Water Won't
Use Teflon Tape.
Figure 4 = Suction Pipe Must Not Leak
1102 0697
Casing
T
Deep well is more
than 25' (7.6M)
to water with
pump running.
Foot
Valve &
Strainer
Figure 5=Use Pump On Deep Well Only
822b 0697
NOTICE: For proper performance, pump MUST be
matched to ejector and to well depth. Use this pump
on wells 25' to 210' deep.
1. Long runs and many fittings increase friction and re-
duce flow. Locate pump as close to well as possible:
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. Protect pump and all piping from freezing. Freezing
will split pipe, damage pump and void the warranty.
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.
[ak CAOTION] Motor normally operates at high temper-
ature and will be too hot to touch. It is protected from
heat damage during operation by an automatic internal
cutoff switch. Before handling pump or motor, stop
motor and allow it to cool for 20 minutes.

DEEP WELL INSTALLATION FOP, DOUBLE PIPE
Pum
Priming
Tee and Gasket
Plig
Pipe Nipple
Drive Pipe
-- 1-1/4" Plastic Suction Pipe
1-1/4" Plastic Pipe
Adapter. (Supplied with Ejector)
-- 1" Plastic Pipe Adapter
Figure 6 - Offset installation
Plastic Pipe Shown
ipling
-- Pump
I Gasket
__ Adapter Flange
, ___-L jThreadlesseoupling[_-I_;1_
_ _ Sae_it_al
-- EjectorAssembly
-- Check Valve
1-'_E 1 0St5ainer
Figure 7= Over the Well Bnstallation
Steel Pipe Shown
Suction: 1-1/4"
Drive: Pipe or Plastic
1-1/4" Pipe Pipe Adapter
orPipePlastic l
Ada
1-1/4"
Cou
1-1/4x1"
Face
Bushing
1" Nipple
1386 1194
Figure 8 - Jet Assembly With
I" and i- 114" Drive Pipes
Piping in The Deep Well
See Figures 6, 7, and 8.
NOTICE: Deep well installations are either single pipe
(2" wells) or double pipe (4" and larger wells). In a dou-
ble pipe installation, the larger pipe is the suction pipe
and the smaller pipe is the drive pipe (very deep wells
may use suction and drive pipes of the same diameter).
Plastic pipe is ideal for double pipe installations. Due
to its light weight, it is easy to handle and does not usu-
ally require a block and tackle for installation and re-
moval.
Double Pipe Rnstallation-Plastic Pipe
NOTICE: Use Teflon tape on all male threads on plas-
tic pipe and fittings to prevent air leaks in suction pip-
hag.
1. Inspect ejector to make sure that nozzle and ven-
turi openings are clean and clear.
2. Inspect pipe for any foreign matter 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.
,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
sides of the pipe. Fill pipes with water to maize sure
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
pump base so that pump discharge will be aligned 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. Remove paper backing from adhesive gasket. Apply
gasket to adapter flange, making sure that holes line
up.
13. Align locating lugs on pump base with locating lugs
on adapter flange; attach pump to flange with cap
screws provided.

DEEP WELL iNSTALLATiON FOR SINGLE PIPE
Pump
mounted
on Casing
Adapter x.
Offset Nipple''_ Pipe Clamp
Well Casim
Drive Pipe
Pipe
Venturi
Nozzle_
Ejector------_
Cup
Leathers
Water level
with pump
ing
10 to 20 Feet
5 Feet
or more
_1
Figure 9
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):
Pipe Clamp
L
Figure IOA -Use tripod and lever hoist to lower
pipe into the well
'_----q"
e
!
•..... i
Figure i0B -Pipe clamp detail
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.
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"
NOTICE: Fill pipe with water as each length is added
to be sure foot valve and connections do not leak.

PRESSURE TANK CONNECTmON
@
Air Volume Control TANK
Sears Stock No. 2761
Pump to Tank Piping
1" Discharge -
Relief Valve Sears
Stock No. 27229
Air Volume Control Tubing/Fitting"
Sears Stock No. 27881
We!l Seal
I
/
To Service
"_ Pressure
1/_ Regulat°r
2355b 0697nc
Figure I I=Pump With Standard Tank
3. Add lengths of pipe until the ejector reaches 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
rtmning, if possible, but always at least 5 feet above the
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
down slightly. Water pressure in the casing will then
soak the cup seals (see Figure 9). They should seal
in 2-3 hours after installation.
5. With ejector set, install well casing adapter. 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 rtm: 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.
Pressure
Regulator
Piping Tee and
1" Discharge
_' Relief Valve
To Service 2358b0697nc
Figure 12 = Pump With Captive-Air* Tank
Check Pressure with
Tire Gauge
Captive-Air_ Tank
1054 0697n¢
Figure 13 = Checking Tank Pre-charge
Standard Tank Connection
When a standard tank is used, an air volume control
(AVC) adds air to the tank when it is needed. See Figure
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.

ELECTRmCAL
WARNING
Hazardousvoltage.
Can shock, burn,or cause
death.
Groundpumpbefore
connectingto powersupply.
IAWARNING IDisconnect power at service panel
before connecting pressure switch.
To convert from
230 to 115 Volts:
Move white wire
w/black tracer
from B to A.
Move black wire
from A to L1.
Motorwires
are connected
to thesetwo
screws.
Clamp
power
cable to
prevent
strain on
]terminal
_screws.
")
copper,orounOw,re!iii1
to green ground screw.
Connect black and white
power supply wires tothese two screws, one i_
Y
wire to each screw.
It doesn't matter which
wire goes to which screw. 12580994
Figure U4 = nU5/2.30 volt motor wiring connec-
tions through ty'pical pressure switch.
Dual voltage motors come factory wired for 230 volt
operation. Unsetshows i 15Volt conversion,
Do not a_ter wiring in singlevoltage motors.
Match motor voltage to power supply voltage.
AGround motor before connecting to electri-
cal power supply. Failure to ground motor
can cause severe or fatal electrical shock hazard.
A To avoid dangerous or fatal electrical shock,
turn OFF power to motor before working on
electrical connections.
A Supply voltage must be within +10% of
nameplate voltage. Use wire size specified in
Wiring CharL If possible, connect pump to a sep-
arate branch circuR wRh no other appliances on
it. Incorwect 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,
then to green grounding terminal provided on pres-
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
lead in seiwice panel or to metal underground water
pipe or well casing at least 10 ft. long. If plastic pipe
or insulated fittings are used, run ground wire db
rectly to metal well casing or use ground electrode
furnished by the power company.
To Connect Pressure Swi_:ch (Fig. 14)
A 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
side of switch marked GROUND, GRD, or @ .There
may be two ground terminals; connect to either
one.
WInkING CHART = Recommended Wire and Fuse Sizes
MOTOR MAX. LOAD BRANCH FUSE* DISTANCE IN FEET FROMMOTORTO METER
HP VOLTS AMPS RATING(AMPS) 0 to 50 51 to 100 101 to200 201 to 300
1 115/230 19.2/9.6 25/15 10/14 10/12 8/10 6/10
(*)Timedelayfuseorcircuitbreakersare recommendedin anymotorcircuit.

ELECTRICAL /OPE TUON
2360a 0697
2361a 0697 1030a 0697
A - CHose Regulator _ B =Fill Pump With Water _ C -Start Pump _D = Adjust Regulator
Figure R5 _ Priming Pump
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
]&WARNINGIBurnhazard. 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 s_ing.
I&WARNING]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. Close regulator valve (turn clockwise -see Figure
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. Stax_t Pump:
Pressure should increase rapidly to 50 potmds 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
sevel_al 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. Control valve, check valve, or foot valve installed
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,
10

OPE T ON /MAUNTENANCE
regulator valve until pressure falters (pressure
gauge needle flutters; pump may become noisy- see
Figure 16B). At this point, close (turn clockwise)
regulator valve slightly until pressure stabilizes. This
setting provides maximum flow (Figure 16C).
5. Pump may draw well down far enough at this point
to lose its prime. If so, close regulator valve until
pressure is stable throughout pumping cycle. Close
faucets and allow pump to pressurize tank and shut
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 falteling of pressure. In this case, opec-ate
pump with regulator valve open.
HELPFUL HINTS /MAUNTENANCE
How To Handle AGaseous _N'enH
In some areas well water contains gases which must be
allowed to escape before the water is used. To deliver
gas-free water suspend a pipe, closed at the bottom and
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 thi°ough the pipe and
into the suction pump is free of gas. This type of well
must be vented to the outside of any enclosure.
Figure 16A - Open Regulator Valve
Figure 16B=Watch for Pressure Gauge to Flutter
Figure !6C = Close Regulator V, dve until
Pressure Stabilizes
Air Control In Nowing WeIBs
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-
sure gauge which will indicate (1) receding water level
in the well, (2) leakage in the suction line or in the
pump, or (3) clogged impeller.
To use, install the gauge in the air volume control (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 a!l air from pipes, loosen regula-
tor screw until compound gauge shows 15" 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, ff neces-
sary, reduce the regulator setting to b,ing the vacuum
reading back to 15". If the pump does not develop 15"
of vacuum according the gauge, you may have air 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.
cap
Figure R7=Gas/Air Control in Well
11

HAmNTENANCE
Pump Diassembly
1. Pull disconnect switch. Disconnect power fines
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).
.Hold the motor shaft with priers or vice grips
through the opening in the pump adapter. Unscrew
the impeller nut off the end of the shaft (see Figure
20).
Figure 20
.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.
Figure ]8
.Turn the pump upside down on the bench and
block it. Remove the four cap screws fi'om the base,
With a mallet, tap upward on the base to loosen it.
Lift the base off of the intermediate volute (see
Figure 19).
Figure 2 R
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.
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.
Figure 22
12

HAUNTENANCE
11. Remove the intermediate volute and slide the im-
peller spacer off of the shaft.
12. Remove the impeller. Don't disturb the shaft keys 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 puU 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.
lns_llation Of New Seal
1. Clean all gasket surfaces thoroughly before re-
assembly. Clean the seal bore cavity in the pump
adapter.
2. Wet the rubber seat ring with soapy water and push
the stationary part of the seal 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 Remove the cardboard once
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.
.Carefully slide the adapter over the shaft (see
Figure 24). Do not damage the shaft sealing surface;
it is highly polished and any slight scratches or nicks
will ruin it.
Figure 24
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).
Figure 23
Use pliers-
with care-
no hammers.
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

HAINTENANCE
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 otheg 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 stir in place. Hold
the motor shaft with slip-joint pliers or vice-grips
and install and tighten the impeller locknut.
Tightening the lock nut automatically spaces the im-
peller correctly. Do not overtighten.
11. Install the base volute gasket. Make sure the gasket
is _ht side up so that the waterpassage holes line
up with the water passages in the volutes. Install
the base volute, using the alignment marks made
before disassembly. Maize 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
(see Figure 26). These should be easy to install if ev-
erything is correctly aligned. If not, don't force
them; go bach over your work and find and cor-
rect the misalignment.
Bolts should
be easy to
insert.
Make sure
all marks
line up.
Figure 26
13. Reinstall the pressure switch barb fitting and pres-
sure tube.
14. Reinstall the pump on the adapter flange (use a new
gasket) and reconnect the wiring and grounding.
Pump is now ready for operation.
14

TROUBLESHOOTING CHART
SYMPTOM POSSIBLE CAUSE(S) CORRECTIVE ACTION
Motorwillnot run 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
Motor runs hot and
overload kicks off
Motor runs but no
water is delivered
I *(Note: Check
)rime before look-
ing for other
causes. Unscrew
3ressure 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)
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.
2.
3.
1.
Pump pumps water
but does not shut
off 2.
3.
4.
5.
Pump cycles too t.
frequently 2.
3.
4.
5.
6.
Water level in well is lower than es-
timated
Steel piping (if used) is corroded or
limed, causing excess friction
Offset piping is too small in size
Air spurts from
faucets
Pressure switch is out of adjust-
ment or contacts are "frozen"
Faucets have been left open
Ejector or impeller is clogged
Water level in well is lower than es-
timated
Wrong voltage
Standard pressure tank is water-
logged and has no air cushion
Pipes leak
Faucets or valves are open
Foot valve leaks
Pressure switch is out of adjust-
ment
Air charge too low in Captive-Air e
tank
1. Pump is picking up prime
2. Leak in suction side of pump
3. Well is gaseous
4. intermittent overpumping of well
!. 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,
2.
3.
1.
2.
3,
4.
5.
6.
Refer to instructions on wiring
Check with power company. Install heavier wiring if wire
size is too small. See wiring instructions.
See section below on too frequent cycling
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
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.
Clean ejector or impeller; see Maintenance
Replace check valve or foot valve
Thaw pipes. Bury pipes below frost line. Heat pit or pump
house.
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.
1.
2.
3.
4.
5.
Use larger offset piping
Adjust or replace pressure switch
Close faucets
Clean ejector or impeller
Check possibility of using a deep well jet pump
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 switchcut-in
setting, pump air into tank from outside source untilthe air
pressure isthe 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
]5

REPAIR PARTS
23
t
14
14B
-14C
/
17 _--18
1281 0994
MultioStage
Jet: Pump
ModeR
390.253250
2080 1095
16

REPA| R PARTS
Key
No.
2
3
4
5
6
7
8
9
10
11
12
13
14
14A
14B
14C
15
16
17
18"
Repair Parts List - Multi=Stage Jet
Model Number
390.253250
1HP
115/230V/60Hz
J218-600C
L43-5C
U36-112ZP
U217-1228
Motor
Connector
Locknut-1/2"
Pressure Switch
Part
Description
U37-672P
J212-24A
L2-16
U30-75ZP
U65-15SS
U109-99
J24-11
J105-76P
J43-23
J101-26
J20-11
J23-10
J23-11
U36-175D
J101-33
U78-57CT
U30-82ZP
F642-9502
Switch Tube - 14-1/2"
Pressure Regulator Assembly
Adapter
Capscrew - 3/8"-16x1-1/4" Lg. (2 Req.)
Shaft Key (2 Req.)
Seal - Shaft
Spring Holder
Impeller (2 Req.)
Spacer- Impeller
Intermediate Volute w/Wear Rings
Gasket (2 Req.)
Wear Ring (2 Req.)
Wear Ring
Impeller Nut
Base Volute w/Wear Ring
Pipe Plug - 1/4" NPT
Capscrew - 3/8"-16x4-1/4" Lg. (4 Req.)
Owner's Manual
Repair Parts List- Pressure Regulator
Key Part Numbers
No. J212-24A
1 Jl12-14
1A U111-212T
1B J66-16
2 J220-16B
2A J42-5
2B J62-9
2C J20-16
2D J43-31
2E U43-23ZP
2F U36-36ZP
3 U78-107DT
4 U239-3
5 J24-13
6J61-5
7J52-9
8 U30-60ZP
9 U30-69FTZP
10 U36-37ZP
Part Description
Pressure Regulator Body w/Seat
Barbed Fitting - Elbow
Valve Seat
Diaphragm Assembly
Regulator Guide
Stem
Diaphragm
Spring Follower
Lock Washer
Nut 1/4-20
Reducer Bushing 1/2xl/8 NPT
Pressure Gauge 0-100#
Spring
Spring Guide
Bonnet
Capscrew 5/16-18x3/4" Lg. (4 Req.)
Adjusting Screw 5/16-18x2"
Locknut 5/16-18
17
* Standard hardware item; may be
purchased locally.
** Not mailable; specify freight or ex-
press.
o 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.
To Order Parts,
Call Sears Product Service,
I=800=366=72 78

To Order Parts,
Call Sears Product Service,
1-800o366o7278
REPAIR PARTS
Sears Vertical Casing Adapters and Adapter Flanges
for MuRti°Stage Jet Pump
3
Adapter Flange
8
Casing Adapter
Repair Parts List °Adapter Flange
Key Model
No. 390.253250 Part Description
1 J20-12 Adapter Gasket
2J2-17B Adapter- 1-1/4"x1-1-1/4" NPT
3* U30-86PS 1/2-13 x1-1/4" Long Capscrew (2 Req.)
* StandardHardwareItem,may be purchasedlocally.
Repair Parts List =Casing Adapters
Key
No.
1
2
3
4
5
6
7
8
9
J216-13
2"
U30-282ZP
J16-19ZZP
J21-19
J21-18
J51-1ZZP
U30-277ZP
J21-17
J 16-20ZZP
U36-38ZP
J216-14
3"
U30-282ZP
J 16-23ZZ
J21-19
J21-18
J51-3ZZ
U30-277ZP
J21-21
J16-24ZZP
U36-38ZP
Part Description
3/8-16x5" Long Machine Bolt (2 Req.)
Upper Flange
Seal Ring - Drive Pipe
Seal Ring - Suction Pipe
Casing Adapter Body
3/8-16x2-1/2" Hex Hd, Bolt (3 Req.)
Seal Ring - Lower
Lower Flange
3/8" Hex Nut (3 Req,)
18

REPAIR PARTS
Jet PacEages
2" and 3" Single Pipe Jets
_---- 3
5
4
1359 1094
13601094
Well
<--Casing
_Drop
Pipe
--9
10-
Key
No.
1
1
2
3
4
5
6
8
9
10
11
12
e
• Not
4" Double Pipe Jets
2 12_
Suction Pipe: 1-1/4"'_
Drive Pipe: 1"
Adapt/_er
1" Pipe-
Adapter
132o 1094
/Well Seal
--Steel Nipple
_oupling
_Adapter
Repair Parts List = Jet Packages
29670
2" Single
Pipe Jets
J32P-24
J32P-18
J34P-42
J40-24
J57-1
J43-14P
P122-10B
J66-13
Ul1-1
J37-4
J216-13
U37-116GP!
illustrated.
29902
3" Single
Pipe Jets
J32P-24
J32P-18
J34P-42
J40-25
J57-3
J43-16
J43-20C
J161-3
J66-14
J37-4
J216-14
U37-116GP
29660
4" Double
Pipe Jets
J32P-24
J32P-18
J34P-42
N40-92
m
N212-12P
m
L8-1 P
U11-104P
Part
Description
Venturi
Venturi
Nozzle
Jet Body
Packer Leathers (2 Req)
Spacer
Washer
Check Valve
Valve Seat
Turned Coupling (11 included)
1" NPT Offset Nipple
Strainer
Plastic Pipe Adapter
Casing Adapter
1" x 6" T.O.E. Nipple
Pump
Model
390.253250
Venturi Selection Chart
Max. Depth with Jet Package No.
29670 29902 29660
Venturi 2" Single 3" Single 4" Double
HP Installed Pipe Pipe Pipe
J32P-24 90' 100' 100'
1J32P-18 180' 210' 210'
19

The model number of
your Multi-Stage Jet
Pumpwill be found on
the pump body.
When requesting service
or ordering parts, always
give the following
information:
®Product Type
®Model Number
o Part Number
®Part Description
ULTi..STAGE
JET U P
Forthe repairorreplacementpartsyouneed
Call7 am - 7 pm,7 daysa week
t ..SOO-366-PARY
(1-800-366-7278)
Forin-homemajorbrandrepair service
Call24 hoursa day,7 daysaweek
1-8OO-4-REPAIR
(1-89g-473-7247)
Forthelocationofa
SearsRepairServiceCenterinyourarea
Call24 hoursaday,7 daysaweek
1-8OO-488- t 222
ForinformationonpurchasingaSears
Maintenance Agreementor to inquire
about an existingAgreement
call 9 am- 5 pm,Monday-Saturday
1-800-827-6655
America's Repair Specialists
Sears, Roebuck and Co., Hoffman Estates, mL60179 U.S.A.