Sears 390.304550 User manual

owners
manual
MODEL NO.
390.304550
390.304610
CAUTION:
Read All Instructions
Carefully Before Start-
ing The Installation.
Save This Manual For
Future Reference.
Sears, Roebuck and Co., Chicago, IL 60684 U.S.A.
• Installation
• Operation
• Repair Parts
PRINTED IN U.S.A.
SUBMERSIBLE
SUMP PUMP
Model No. 390.304550 - 1/4 HP
Craftsman Model No. 390.304610 - 1/3 HP
Form No. F642-0692 (Rev. 10/20/93)

CONTENTS
INTRODUCTION/WARRANTY.......................................2
SAFETY...........................................................................2
INSTALLATION...........................................................3-5
SERVICE..........................................................................5
PARTS.............................................................................6
INTRODUCTION
Please read our instructions before you install and use
your new pump; this will help you obtain full value and
good service from it. It will also help you avoid needless
service costs that result from causes we cannot control
and cannot cover in our warranty.
2
FULL ONE YEAR WARRANTY ON SEARS SUBMERSIBLE SUMP PUMPS
During the first year after the date of purchase, Sears will repair or replace this pump, free of charge, if defective in materials or
workmanship.
This warranty does not cover repairs on replacement parts necessary because of abuse or negligence including failure to install,
adjust and operate this pump according to the instructions in the owner’s manual.
LIMITED WARRANTY ON CRAFTSMAN SUBMERSIBLE SUMP PUMPS
During the second year after the date of purchase, Sears will furnish, free of charge, a replacement part for any defective part. You
pay for labor. LIMITATION OF LIABILITY
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!
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 serious
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 ignored.
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
installing pump.
2. Follow local and/or national plumbing and electrical
codes when installing pump.
3. To avoid fatal shocks, proceed as follows
if pump needs servicing:
A. Disconnect power to pump outlet box before
pulling pump cord plug. After plug is pulled, let
pump cool for 20 minutes before attempting to
work on it.
B. Take extreme care when changing fuses. To
reduce the chance of fatal electrical shocks, DO
NOT stand in water or put your finger in the fuse
socket.
C. Ground the electrical outlet box.
D. Use only a Ground Fault Circuit Interrupter
(GFCI) protected grounded outlet for cord plug.
4. Never run pump dry. To do so can damage internal
parts, overheat the pump (which can cause burns to
people handling or servicing the pump), and will void
the warranty!
5. DO NOT attempt to oil the pump motor. A special oil
has been put into the motor housing at the factory; use
of any other oil will void the warranty and could
damage the pump.
6. This pump is recommended for use in permanent
installations only. Pump water only with this pump.
ADDITIONAL INSTALLATION
MATERIALS
Sears Sump Pump Hose Kit, Stock No. 2790, containing
24' (7.3M) of 1-1/4" flexible plastic pipe, a 1-1/4" plastic
adapter and a stainless steel clamp.
Check Valve, Sears Stock No. 2789.

3
THE SUMP
The sump should be located at the lowest place in the
basement or area to be drained. Floor drains from other
areas in the basement may be tiled into the sump. Drain
tile around a house foundation can also be tiled into the
sump, effectively removing water and relieving pressure
from this area. A suitable sump can be a 20" or 24" (500-
610mm) sewer tile. The minimum size is 12" (305mm) in
diameter for automatic float switch.
A sump cover is desirable to exclude refuse from the
sump. Consult local code for sump cover specifications.
NOTICE: Periodically inspect pump, system components,
and sump for debris and foreign objects. Keep sump free
of all refuse. Perform routine maintenance as required.
PUMP INSTALLATION
Set the pump on the bottom of the sump, making sure that
is sits solidly and is level. Be sure there is enough space
around the pump to allow the switch free movement as
the sump water level changes.
Risk of flooding. If a flexible discharge hose
is used, pump may move around in sump when motor
starts. If it moves far enough so that the switch hits the
side of the sump, the switch may stick and prevent pump
from starting. Make sure that pump is secured so that it
cannot walk around in sump.
Hose Kit No. 2790 includes 1-1/4" flexible plastic pipe for
the discharge pipe. Run discharge pipe to the nearest
sewer outlet or other point of disposal. Use the most direct
route and the fewest turns and elbows possible. Make sure
that pump cannot move around in sump pit.
Use teflon tape to seal threads in plastic pipe. Hand tighten
only.
NOTE: To avoid backflow into sump when pump shuts
off, install a Sears Check Valve, Stock No. 2789, in
threaded discharge port of pump. Be sure arrow on check
valve body points away from the pump.
AUTOMATIC FLOAT SWITCH
INSTALLATION AND OPERATION
The automatic float switch is factory mounted on the
pump and preset for a pumping range of approximately
7". Tether length is factory preset at 3-1/2" (89mm) (see
Figure 3, Page 4). Do not change tether length.
When sump is dry, the watertight automatic float switch is
hanging in a downward position and the pump is off.
As water comes into the sump, the automatic float switch
rises to an upward position and the pump starts.
Water will continue to be pumped until the float switch is
hanging in the downward position again, when pump will stop.
Risk of electric shock. Before installation,
check your local electrical codes. To avoid personal
injury when servicing your pump, be sure that the power
is disconnected from both the pump and the float switch.
To check operation, fill sump with water and observe
operation through one complete cycle.
DO NOT ALLOW PUMP TO RUN DRY
Pump should not be allowed to run dry prior to shutting
off. To do so voids the warranty and could ruin the pump.
Switch Failure
If switch fails, pump can be operated by unplugging motor
cord from switch cord and plugging motor cord directly
into electrical outlet.
Sewer Tile
Concrete
Sewer Tile
Sump Cover Basement Floor
1/4" (6mm)
24" Min.
(610mm)
20" to 24"
(500 to 610mm)
20" to 24" Diam.
(500 to 610mm)
FIGURE 1
Foundation
Footing
Drain
Check
Valve
Auto
Float
Switch
Grounded
Electrical
Outlet
Make sure
pump cannot
move in sump
FIGURE 2
31/2"
(89mm)
FIGURE 3 – Tether Length

NOTICE: Pump will continue to run as long as motor is
directly plugged into outlet; DO NOT RUN PUMP DRY.
Replace switch as soon as possible.
ELECTRICAL CONNECTIONS
Risk of electric shock. This pump is supplied
with a grounding conductor and grounding-type
attachment plug. To reduce the risk of electric shock, be
certain that it is connected only to a properly grounded,
grounding-type receptacle.
The Sump Pump has a 3-prong electric plug. The third
prong is used to ground the pump to prevent possible fatal
shock. The third prong should never be removed. Your
electrical outlet should be the 3-prong, polarized type
with an internal ground.
A separate branch electrical circuit is recommended. DO
NOT USE AN EXTENSION CORD.
Testing For Ground
For your safety, check your outlet for ground using an
Underwriters Laboratory Listed Circuit Analyzer. (Figure
4A). A Circuit Analyzer will tell you by a pattern of lights
if the power, neutral, and ground wires are correctly
connected to your outlet. It can also be used to check
other outlets in your home. A Circuit Analyzer is available
in the Sears Electrical Department.
Grounding Outlet
If your outlet is not grounded, install a copper wire (at
least 14 gauge) from the outlet box, as shown in Figure
4B, to a metal cold water pipe. Use ground clamp on
pipe.
IMPORTANT: The cold water pipe you use as a ground
must have metal continuity to electrical ground. If
continuity is interrupted by plastic, rubber, or other
electrical insulators; such as hoses, fittings, washers or
gaskets (including water meter or pump), a metal bypass
must be used. Any electrically insulated connector should
be jumped (as shown in FIgure 4C), with a length of No. 4
wire clamped securely at both ends.
Automatic Thermal Overload Protection
This pump motor has a built-in automatic thermal overload
protector. If the motor overheats, the protector will open
and cut off power to the motor before the heat damages it
internally. The overload will reset automatically and the
pump will restart after the pump cools down below the
danger point.
DO NOT attempt to work on the pump or
motor if the overload seems to have tripped. The motor
may restart without warning at any time. You could be
injured and the pump damaged if it starts when you are
working on it. Remove all power from pump before
attempting to work on it.
DO NOT attempt to repair a non-operational sump pump.
Take it to Sears for service by a qualified technician.
Generator Sizing
Below is the minimum Engine-Generator Watt rating re-
quired to power this pump motor. Any additional loads,
such as lights, must be added to the listed load and the
generator sized accordingly.
Pump Minimum Watt
Model HP Rating of Generator
390.304550 1/4 1000
390.304610 1/3 2200
SERVICE
General
Risk of electric shock. When servicing pump
always disconnect power to electrical outlet and remove
pump electric cord from outlet.
1. If pump does not operate:
a. Check for loose plug at electric outlet.
b. Check for blown fuses or tripped circuit breakers at
fuse box/circuit breaker box.
c. Be sure nothing interferes with action of automatic
float switch.
4
UL Listed
Analyzer Outlet
Face Plate Outlet
Outlet
Box
Bare Copper Wire
to Cold Water Pipe
Face
Plate Screw
No. 4
Wire
Clamp
Metal Water Pipe Meter
Clamp
FIGURE 4A
FIGURE 4B
FIGURE 4C

5
d. If a, b, and c above check OK, plug in a light that
you know works. If it lights, take your pump to
Sears for service. If it doesn’t light, the electrical
circuit is faulty; consult a licensed electrician.
2. Pump starts, but blows fuses/trips circuit breakers:
After disconnecting power to pump, remove it from
sump. Remove the plate from the bottom of the pump
and make sure that the impeller turns freely. Remove
any debris obstructing impeller. If pump still does not
operate correctly, return it to your nearest Sears
Service Department for repairs.
3. Pump runs, but does not empty sump:
a. Clean pump intake screen.
b. Water may be entering sump faster than the pump
can discharge it.
c. Be sure vertical distance from pump discharge
outlet to discharge pipe outlet does not exceed
specifications. See chart below.
d. Be sure discharge pipe is not plugged or frozen.
e. Be sure check valve is operating correctly.
Risk of electric shock. Unplug pump before
attempting to service or remove any component.
1. The motor in the unit is sealed in oil. No additional
lubrication is necessary.
2. NOTICE: Disassembly of the motor assembly will void
warranty. It might also cause internal leakage and
damage to the unit. If motor fails, replace entire pump.
3. Keep inlet screen clean and free of all foreign objects.
Pump Cleaning
1. NOTICE: Attempting to disassemble motor will void
warranty.
2. To clean impeller, remove eight screws holding
baseplate to motor assembly. Clean/replace impeller as
necessary. To remove impeller, unscrew it from motor
shaft.
3. Re-install baseplate and screws.
Switch Replacement
1. Remove pump power cord from switch plug.
2. Remove tether clamp screw and slide cord out of
clamp.
3. Insert new switch cord in clamp. Distance from clamp
to float should be the same as original installation.
(See Figure 3, Page 4).
4. Tighten tether clamp screw.
NOTICE: Make sure switch can swing through its
entire arc without interference from sump, plumbing,
or any other object.
5. Check operation by filling sump with water and
running pump through one complete cycle.
Failure to make this operational check
may lead to improper operation, premature pump
failure and flooding.
Stock Maximum Dimensions in inches (mm) GPM (L/min.) at Vertical Pumping Distance in Feet (M)
Number HP Amps Length Width Height 5'(1.6) 10'(3) 15'(4.6) 18'(5.5) 20'(6.1)
30455 1/4 8.5 8-1/2"(216) 8-1/2"(216) 9-3/4"(248) 38(144) 27(102) 11(41.6) – –
30461 1/3 13.0 9"(229) 6-1/2"(165) 11-1/2"(292) 50(189) 41(155) 28(106) 15(56) 3(11.3)
SPECIFICATIONS
SERVICE INFORMATION
Now that you have purchased your SUMP PUMP, should a need ever exist for repair parts or service,
simply contact any Sears Service Center. Be sure to provide all pertinent facts when you call or visit.
The Model Number of your Sump Pump will be found on a plate attached to the side of the Motor.
WHEN ORDERING REPAIR PARTS, ALWAYS GIVE THE FOLLOWING INFORMATION:
• PART NUMBER • PART DESCRIPTION
• MODEL NUMBER • NAME OF ITEM
All parts listed may be ordered from any Sears Service Center.
If the parts you need are not stocked locally, your order will be electronically transmitted to a Sears Repair
Parts Distribution Center for handling.
When Sears arranges the installation, you can be sure the job is done right. We will arrange for
professional workmanship…and we’ll take care of the entire project. What’s more, during installation you
get insured protection…against property damage and also against accidents to workmen. All you have to
do is talk to your Sears salesperson or call your nearest store today for detailed information.

6
EXPLODED VIEW – REPAIR PARTS
Sears Submersible Pump Craftsman Submersible Pump
Model 390.304550 Model 390.304610
Key 30461 Part
No. Part No. Description
1 U30-934ZP Baseplate Screw (8 Required)
2 PS4-17P Baseplate
3 RP000911A Impeller
4 PS1-29P Volute
5 ** Motor Assembly Complete
6 CC0030-13 Cable Clamp
7 SC004-133 Cable Clamp Screw #8-32-1/2
8 PS17-53 Power Cord
9 3031 Piggyback Automatic Float Switch
10 U30-912ZP Screw (4 Required)
• F642-0692 Owner’s Manual
Key 30455 Part
No. Part No. Description
1 U30-934ZP Screw, Pump Body (8 Required)
2 FP0005781 Lower Pump Body
3 RP000917 Impeller
4 U30-912ZP Screw, Motor Housing (4 Required)
5 FP0006023 Upper Pump Body
6 ** Motor
7 CC0030-13 Cable Clamp
8 SC004-133 Cable Clamp Screw #8-32-1/2
9 PS17-54 Power Cord
10 3031 Piggyback Automatic Float Switch
• F642-0692 Owner’s Manual
PARTS LISTPARTS LIST
• Not illustrated ** If motor fails, replace entire pump.• Not illustrated ** If motor fails, replace entire pump.
To Order Parts in the U.S.A., Call
Sears Product Service, 1-800-366-7278
To Order Parts outside the U.S.A., Contact
Your local Sears Service Center or Store

7

owners
manual
MODEL NO.
390.304550
390.304610
HOW TO ORDER
REPAIR PARTS
SEARS SERVICE
IS AT YOUR SERVICE
WHEREVER YOU LIVE
OR MOVE IN THE
Sears, Roebuck and Co., Chicago, Ill. 60684 U.S.A.
SUBMERSIBLE
SUMP PUMP
Now that you have purchased your SUMP PUMP,
should a need ever exist for repair parts or service,
simply contact any Sears Service Center. Be sure to
provide all pertinent facts when you call or visit.
The Model Number of your Sump Pump will be found
on a plate attached to the side of the MOTOR.
WHEN ORDERING REPAIR PARTS, ALWAYS GIVE
THE FOLLOWING INFORMATION:
• PART NUMBER • PART DESCRIPTION
• MODEL NUMBER • NAME OF ITEM
All parts listed may be ordered from any Sears Service
Center.
If the parts you need are not stocked locally, your order
will be electronically transmitted to a Sears Repair Parts
Distribution Center for handling.
When Sears arranges the installation, you can be sure
the job is done right. We will arrange for professional
workmanship…and we’ll take care of the entire project.
What’s more, during installation you get insured pro-
tection…against property damage and also against
accidents to workmen. All you have to do is talk to your
Sears salesperson or call your nearest store today for
detailed information.

owners
manual
MODEL NO.
HOW TO ORDER
REPAIR PARTS
SEARS SERVICE
IS AT YOUR SERVICE
WHEREVER YOU LIVE
OR MOVE IN THE
Sears, Roebuck and Co., Chicago, Ill. 60684 U.S.A.
Form No.