Page 1
SHALLOW WELL PUMP
1 HP - Stainless Steel
47906
SET UP AND OPERATING INSTRUCTIONS
Visit our website at: http://www.harborfreight.com
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
Copyright© 2002 by Harbor Freight Tools®. All rights reserved. No portion of this manual or any artwork contained
herein may be reproduced in any shape or form without the express written consent of Harbor Freight Tools.
Diagrams within this manual may not be drawn proportionally. Due to continuing improvements, actual product may
differ slightly from the product described herein. Tools required for assembly and service may not be included.
For technical questions or replacement parts, please call 1-800-444-3353.
Revised Manual 08i, 08k; 09f, 09k
Page 2
SAVE THIS MANUAL
Keep this manual for the safety warnings
and precautions, assembly, operating, inspection, maintenance and cleaning procedures.
Write the product’s serial number in the back
of the manual near the assembly diagram (or
month and year of purchase if product has no
number). Keep this manual and the receipt in
a safe and dry place for future reference.
IMPORTANT SAFETY
INFORMATION
In this manual, on the labeling, and
all other information provided with
this product:
This is the safety alert sym-
bol. It is used to alert you
to potential personal injury
hazards. Obey all safety messages that follow this symbol
to avoid possible injury or
death.
CAUTION, without the
safety alert symbol, is
used to address practices not
related to personal injury.
SAFETY WARNINGS AND
PRECAUTIONS
WARNING Read all safety warnings
and instructions. Failure to follow the
warnings and instructions may result
in electric shock, re and/or serious
injury.
Save all warnings and instructions
for future reference.
Read all instructions before use!
Keep work area clean1. . Cluttered areas
invite injuries.
Observe work area conditions2. . Do not
expose this pump to rain or submerge
in water. Keep work area well lighted.
Do not use electrically powered pumps
in the presence of ammable gases or
liquids.
DANGER indicates a
hazardous situation
which, if not avoided, will result
in death or serious injury.
WARNING indicates a
hazardous situation
which, if not avoided, could
result in death or serious injury.
CAUTION, used with
the safety alert
symbol, indicates a hazardous
situation which, if not avoided,
could result in minor or moderate
injury.
NOTICE is used to
address practices not
related to personal injury.
Keep children away3. . Children must
never be allowed in the work area. Do
not let them handle Pump.
Use the right pump for the job4. . Do
not attempt to force a small Pump to
do the work of a larger industrial Pump.
There are certain applications for which
this Pump was designed. It will do the
job better and more safely at the rate for
which it was intended. Do not modify
this Pump and do not use this Pump for
a purpose for which it was not intended.
Dress properly5. . Do not wear loose
clothing or jewelry as they can be caught
in moving parts. Protective, electrically
non-conductive clothes and non-skid
footwear are recommended when working. Wear restrictive hair covering to
contain long hair.
Page 2For technical questions, please call 1-800-444-3353.SKU 47906
Page 3
Use eye and ear protection6. . Wear
ANSI-approved impact safety goggles
and ear protection.
Do not overreach7. . Keep proper footing
and balance at all times. Do not reach
over or across running machines.
Maintain Pump with care8. . Keep Pump
clean for better and safer performance.
Inspect pump cords periodically; If dam-
aged, have them repaired by a qualied
technician.
RECOMMENDED MINIMUM WIRE
GAUGE FOR EXTENSION CORDS
(120 VOLT)
NAMEPLATE
AMPERES
(at full load)
0 – 6 18 16 16 14
6.1 – 10 18 16 14 12
10.1 – 12 16 16 14 12
12.1 – 16 14 12 Do not use.
EXTENSION CORD
LENGTH
25’ 50’ 100’ 150’
TABLE A
Disconnect power9. . Unplug Pump when
not in use.
Stay alert10. . Watch what you are doing,
use common sense. Do not install Pump
when you are tired.
Check for damaged parts11. . Before us-
ing Pump, any part that appears damaged should be carefully checked to
determine that it will operate properly
and perform its intended function. Check
for alignment and binding of moving
parts; any broken parts or mounting xtures; and any other condition that may
affect proper operation. Any part that is
damaged should be properly repaired or
replaced by a qualied technician.
Replacement parts and accessories12. .
When servicing, use only identical replacement parts. Use of any other parts
will void the warranty.
Do not install Pump if under the inu-13.
ence of alcohol or drugs. Read warn-
ing labels on prescriptions to determine
if your judgment or reexes are impaired
while taking drugs. If there is any doubt,
do not install the Pump.
USE PROPER EXTENSION CORD. 14.
Make sure your extension cord is in
good condition. When using an extension cord, be sure to use one heavy
enough to carry the current your product will draw. An undersized cord will
cause a drop in line voltage resulting in
loss of power and overheating. Table A
shows the correct size to use depending
on cord length and nameplate ampere
rating. If in doubt, use the next heavier
gauge. The smaller the gauge number,
the heavier the cord.
Maintenance15. . For your safety, mainte-
nance should be performed regularly by
a qualied technician.
Pump clean water only.16. Do not use the
pump for any other application.
People with pacemakers should consult 17.
their physician(s) before use. Electro-
magnetic elds in close proximity to
heart pacemaker could cause pacemaker interference or pacemaker failure.
The brass components of this product 18.
contain lead, a chemical known to the
State of California to cause birth defects
(or other reproductive harm). (California
Health & Safety code § 25249.5, et seq.)
Do not operate this pump if the power 19.
cord or electrical components are
damaged or the seals are compromised. Do not plug in the power cord
Page 3For technical questions, please call 1-800-444-3353.SKU 47906
Page 4
when wet or standing on damp or wet
ground. Exercise caution when working with electrical equipment in the
presence of water to maintain your
personal insulation to avoid shock.
Use GFCI (Ground Fault Circuit Interrupter) outlets when using this pump.
WARNING: The brass components 20.
of this product contain lead, a chemical known to the State of California to
cause birth defects (or other reproductive
harm). (California Health & Safety code §
25249.5, et seq.)
WARNING: Handling the cord on this 21.
product will expose you to lead, a chemical known to the State of California to
cause cancer, and birth defects or other
reproductive harm. Wash hands after
handling.
(California Health & Safety Code §
25249.5, et seq.)
SPECIFICATIONS
Power Requirements 120 V~, 60 Hz, 1 HP
Motor Speed 3400 RPM
Discharge/Intake 1” NPT
Max. Flow 900 GPH
Max. Suction Lift 26’
Max. Total Head 164’
Tank Size 5 Gallons
Pump Body Material Stainless Steel
Cut-in Pressure 20 PSI
Cut-out Pressure 50 PSI
Note: Performance of this pump (if powered
by line voltage) may vary depending on
variations in local line voltage. Extension
cord usage may also affect pump performance.
The warnings, cautions, and instruc-22.
tions discussed in this instruction
manual cannot cover all possible conditions and situations that may occur.
It must be understood by the operator
that common sense and caution are
factors which cannot be built into this
product, but must be supplied by the
operator.
UNPACKING
When unpacking, make sure the item is
intact and undamaged. If any parts are missing or broken, please call Harbor Freight Tools
at 1-800-444-3353 as soon as possible.
REV 07g; 08k; 09c
Page 4For technical questions, please call 1-800-444-3353.SKU 47906
Page 5
Air Valve
(hidden)
INSTALLATION
Discharge
Priming
Inlet
Intake
Pressure
Meter
The water to be pumped must be clean 1.
and must be free of sand and grit, which
would damage the pump and void the
warranty.
Outlet Water
Level
To
Household
Check
Valve
Length of off-set line
(Add when calculating total suction
lift due to friction.)
SLOPE SLIGHTLY DOWNWARD TO WELL
Well
Seal
Water
System
Shallow
Well Pump
Head
Fig. 1
WARNING! TO PREVENT SERIOUS INJURY
FROM ELECTRIC SHOCK:
Install indoors or in weather-proof well
house only. This Pump is non-submers-
ible.
Do not plug in the power cord when wet
or standing on damp or wet ground. Do
not plug in the power cord until instructed
to do so.
Note: ONLY pump clean water.
Note: Additional components (such as valves
and pipes) may be required for installa-
tion, but not included.
Note: Installation requires skilled workman-
ship and compliance with local building
codes. If you are not condent in your
ability to properly and safely install
this pump, have a qualied technician
perform the installation.
Standing Water Level
(With Well Pump Off)
Pumping Water Level (with Well Pump Operating)
Foot
Valve
Vertical Well Lift
Fig. 2
2. The illustration above shows an
example of a proper shallow well pump
installation. The total suction lift (vertical
well lift + length of off-set line) must not
exceed the Maximum Suction Lift listed
on the Specications chart.
Note: This pump is intended for shallow well
application only and is not intended to be
used as a booster pump.
Note: For optimal performance, install the
pump as close to the well head as possible.
Install a Foot Valve at the bottom of the 3.
suction pipe. The Foot Valve must be
under the Pumping Water Level, the
level that the water falls to when the
pump operates.
REV 05l, 07g, 09d, 09e
Install a sterile Well Seal at the top of 4.
the suction pipe to keep the well clean.
Protect from rust inside a frost-proof
enclosure.
Page 5For technical questions, please call 1-800-444-3353.SKU 47906
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Intake and discharge pipes must be at 5.
least 1” in diameter.
Lay an off-set line from the well to the 6.
structure the pump will be installed in.
The off-set line should slope slightly
towards the well (see Fig. 2). Systems
with longer off-set lines should use larger
diameter pipe to improve efciency.
Install the pump on a rigid, level, dry 7.
platform. This platform must provide a
solid, level surface that is capable of
supporting the weight of the pump and
attached piping lled with water. Do
not allow water to contact the pump’s
housing.
Caution: DO NOT INSERT ttings into the
Intake Hole farther than 1/2”; this can
DAMAGE the Pump, diminish Pump
functions, and/or STOP water ow.
Keep the Head, the height that the 8.
pump discharge must push water before
discharge, to a minimum. The Vertical
Well Lift, Off-set Line Length, and Head
added together must be less than Max.
Total Head to have ow at output.
Effective ow decreases to 0 GPH as
Total Head reaches its maximum.
For your protection, the power outlet 9.
used should have a Ground Fault Circuit
Interrupter (GFCI). Have it installed by
a qualied electrician. Keep power line
away from water.
The inlet and discharge lines should not 10.
be wedged or stressed in a way that puts
strain on the pump. Do not support the
pump with the inlet and discharge lines.
REV 09d
Page 6For technical questions, please call 1-800-444-3353.SKU 47906
Page 7
OPERATION
Compression Tank has a rubber bladder 1.
inside. This bladder must be pumped
up to 26-29 PSI of air at all times. Use a
bicycle pump (not included) to inate the
bladder. On the end of the Compression
Tank opposite the side with the Pressure
Meter, is an air valve located under a
cover. Remove the cover over the air
valve and periodically monitor this air
valve with an air pressure gauge to
insure that the rubber bladder maintains
the required air pressure.
Make sure the intake pipe is fully 2.
submerged before continuing.
Before starting the pump for the rst 3.
time, prime it by pouring clean water
into the Priming Inlet.
This is a self-starting pump that uses a 4.
pressure switch. Once the power cord
is connected and the unit is switched on,
the pump can start at any time. Do not
handle or perform maintenance on the
pump if the power cord is plugged in.
To begin pumping, plug in the power 5.
cord and turn the switch on. When the
line is pressurized, the pump will go to
standby mode until the pressure falls
below its starting pressure.
Page 7For technical questions, please call 1-800-444-3353.SKU 47906
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MAINTENANCE
Drain water from pump before storage 3.
by disconnecting the water lines and
WARNING! Disconnect pump from power
source before maintenance.
Clean the inlet screen on the intake port 1.
regularly to remove accumulated debris.
turning the Pump upside down. If storing
the pump for a long time, store it in a dry
location, and apply a light layer of oil to
the metal parts prior to storage, to inhibit
rust. Do not expose to freezing tem-
Wipe the pump clean with a soft, damp 2.
peratures.
cloth with soapy water. Do not use solvents. Do not get the electrical components wet.
After storage, check the Impeller to make 4.
sure it turns easily and is not oxidized.
Note: Turn off the Switch and unplug the
pump when performing maintenance.
Troubleshooting
Problem Cause Solution
The pump won’t start No power.1.
The pump operates
but it won’t discharge
water
Only a low volume of
water ows
Motor overheats often Extension cord too long or wire size too 1.
Pump/motor cycles
rapidly
Tank bladder will not
hold pressure
Water pumps
intermittently
Cut-in and cut-out pressure may be set too
closely.
Water level is being drawn below foot valve. Lower foot valve.
Pressure switch disconnected.2.
Thermal Protection cut out.3.
Blocked impeller.4.
Pump not primed.1.
Lift height exceeded.2.
Inlet tube not submerged.3.
Air in suction pipe.4.
Inlet screen clogged.5.
Inlet pipe is too small.1.
Liquid is too dirty.2.
Lifting height exceeded.3.
Tank’s rubber bladder under-inated.4.
Piping corroded, causing friction.5.
small.
Pump cycling too often.2.
Air inlet valve is leaking. 1.
Bladder is broken.2.
Check connections, and breaker/fuse.1.
Check gauge.2.
Allow pump to cool.3.
Free the impeller.4.
Prime pump.1.
Reduce lift height.2.
Submerge the inlet.3.
Check pipe and seals.4.
Clean screen.5.
Increase pipe diameter.1.
Clean screen frequently.2.
Reduce lifting height.3.
Inate to 26-29 PSI.4.
Replace piping, with plastic where 5.
possible.
Eliminate use of extension cord or use 1.
shorter/heavier gauge cord.
Cut-in and cut-out pressure may be set 2.
too closely; Have the pressure switch
adjusted by a qualied technician.
Have the pressure switch adjusted by a
qualied technician.
Check air tank for leaks using soapy 1.
water and replace bladder if needed.
Replace bladder.2.
Follow all safety precautions whenever diagnosing or servicing the pump.
Disconnect power supply before service.
Do not disassemble the pump or motor as this will damage the water seals.
All repairs should be performed by a qualied technician.
REV 06c; 07g; 07l; 08l; 09d
Page 8For technical questions, please call 1-800-444-3353.SKU 47906
Page 9
Problem Cause Solution
Pump will not hold
prime
Water is full of
bubbles at outlet
Motor runs, but water
is not pumping
Pump does not shutoff
Foot/check valve not installed in suction 1.
line.
Foot/check valve leaks water back to well.2.
Pumping bubbles temporarily as air is 1.
purged after initial setup.
Leak in suction side of pump system.2.
Well is gaseous.3.
Water level below suction inlet of foot 4.
valve.
Improper priming. 1.
Air leakage. 2.
Vertical lift too high. 3.
Water level below suction inlet of foot 4.
valve.
Frozen pipes. 5.
Foot valve in dirt or sand.6.
Foot/check valve clogged.7.
Pressure switch is set too low.8.
Pressure switch contacts welded together. 1.
Faucet is open or leaking.2.
Toilet leaking.3.
Impeller is clogged.4.
Tank bladder pressure is too low.5.
Pipeline leakage.6.
Foot/check valve leaks water back to well.7.
Install foot and check valve in suction 1.
line.
Replace foot/check valve.2.
Temporary self-remedying issue. 1.
Check for and x leaks.2.
Install a sleeve in the well.3.
Lower suction line into water and re-4.
prime. If water is deeper than 26 ft,
then a deep well pump may be needed.
Prime the pump by pouring clean water 1.
into the Priming Inlet.
Check all pipes and joints in the suction 2.
line for air leakage using soapy water.
Reduce vertical lift to within 3.
specications. See Installation
instructions.
Lower suction line into water and re-4.
prime. If water is deeper than 26 ft,
then a deep well pump may be needed.
Thaw the pipes. Bury pipes below 5.
freeze line/insulate pipes.
Raise foot valve to clean water level.6.
Clean or replace foot/check valve.7.
Have the pressure switch adjusted by 8.
qualied technician (20-50 psi).
Have the pressure switch replaced by a 1.
qualied technician.
Close or repair faucet.2.
Repair leaky toilet.3.
Clean impeller.4.
Inate to 26-29 psi.5.
Repair pipeline.6.
Replace foot/check valve.7.
Follow all safety precautions whenever diagnosing or servicing the pump.
Disconnect power supply before service.
Do not disassemble the pump or motor as this will damage the water seals.
All repairs should be performed by a qualied technician.
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY
DIAGRAM IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR
DISTRIBUTOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE
OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT HE OR SHE IS QUALIFIED
TO REPLACE ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER AND/OR DISTRIBUTOR
EXPRESSLY STATES THAT ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY
CERTIFIED AND LICENSED TECHNICIANS, AND NOT BY THE BUYER. THE BUYER ASSUMES ALL RISK
AND LIABILITY ARISING OUT OF HIS OR HER REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT
PARTS THERETO, OR ARISING OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.
Page 9For technical questions, please call 1-800-444-3353.SKU 47906
Page 10
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS DIAGRAM IN THIS
MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER NOR DISTRIBUTOR MAKES ANY
REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE OR SHE IS QUALIFIED TO MAKE
ANY REPAIRS TO THE PRODUCT OR THAT HE OR SHE IS QUALIFIED TO REPLACE ANY PARTS OF THE
PRODUCT. IN FACT, THE MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY STATES THAT ALL REPAIRS
AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY CERTIFIED AND LICENSED TECHNICIANS
AND NOT BY THE BUYER. THE BUYER ASSUMES ALL RISK AND LIABILITY ARISING OUT OF HIS OR HER
REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO, OR ARISING OUT OF HIS OR
HER INSTALLATION OF REPLACEMENT PARTS THERETO.
Record Product’s Serial Number Here:
Note: If product has no serial number, record month and year of purchase instead.
Note: Some parts are listed and shown for illustration purposes only, and are not available
individually as replacement parts.
PARTS LIST
Part Description Qty.
1 Screw M8x12 4
2 Motor Housing 1
3 Fan Blade 1
4 Rear Cover 1
5 Spring Washer 1
6 Motor Bolt M5x125 4
7 Stator 1
8 Bearing 1
9 Rotor 1
10 Bearing 1
11 Rubber Sheath 1
12 Screw 4.2x15 2
13 Cable Block 1
14 Cable Sleeve 1
17 Waterproof Cover 1
19 Sealing 1
20 Capacitor Cover 1
21 Capacitor 1
22 Side Cover 1
24 Waterproof Switch 1
25 Screw 3.5 x 20 3
26 Hex Nut M8x20 4
27 Front Cover 1
Part Description Qty.
28 Rubber Ring 1
29 O-ring 1
30 Flange 1
31 Immobile Ring 1
33 Impeller 1
34 Flow Guide Plate 1
35 O-ring 1
36 Flow Guide Assy. 1
37 O-ring 1
38 Pump Shell 1
42 Screw M8x20 4
43 O-ring 1
45 Small Valve Cover 1
52 Retaining Ring 1
53^ PTFE Thread Seal Tape Roll 1
54^ Foot Valve 1
55^ Check Valve 1
^ Parts marked with a caret (^) are not shown on the diagram.
Page 10For technical questions, please call 1-800-444-3353.SKU 47906
Page 11
ASSEMBLY DRAWING
REV 08f, 09c
Page 11For technical questions, please call 1-800-444-3353.SKU 47906
Page 12
PARTS LIST AND ASSEMBLY DRAWING A
Note: When ordering a part from this drawing, you must include the sufx “A” with the number.
Part Description Qty
1A Compression Tank 1
2A Pump Assembly 1
3A Hex Bolt 2
4A Hex Nut 2
5A Pressure Meter 1
6A Cable 1
7A Switch 1
8A Cord 1
9A Tube 1
10A Latex Seal 1
51A Rubber Bladder (not shown) 1
5B Bushing 1
10B Latex Seal 1
REV 05h, 08f, 09c
Page 12For technical questions, please call 1-800-444-3353.SKU 47906
Page 13
LIMITED 1 YEAR / 90 DAY WARRANTY
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability standards, and warrants to the original purchaser that for a period of ninety
days from date of purchase that the engine/motor, the belts (if so equipped), and the blades
(if so equipped) are free of defects in materials and workmanship. Harbor Freight Tools also
warrants to the original purchaser, for a period of one year from date of purchase, that all other
parts and components of the product are free from defects in materials and workmanship (90
days if used by a professional contractor or if used as rental equipment). This warranty does
not apply to damage due directly or indirectly, to misuse, abuse, negligence or accidents, repairs or alterations outside our facilities, normal wear and tear, or to lack of maintenance. We
shall in no event be liable for death, injuries to persons or property, or for incidental, contingent,
special or consequential damages arising from the use of our product. Some states do not
allow the exclusion or limitation of incidental or consequential damages, so the above limitation of exclusion may not apply to you. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL
OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us with transportation charges prepaid. Proof of purchase date and an explanation of the complaint must
accompany the merchandise. If our inspection veries the defect, we will either repair or replace the product at our election or we may elect to refund the purchase price if we cannot
readily and quickly provide you with a replacement. We will return repaired products at our expense, but if we determine there is no defect, or that the defect resulted from causes not within
the scope of our warranty, then you must bear the cost of returning the product.
This warranty gives you specic legal rights and you may also have other rights which
vary from state to state.
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 444-3353
REV 07g
Page 13For technical questions, please call 1-800-444-3353.SKU 47906
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