GORMAN-RUPP PUMPS SBM-00192 User manual

OM-05724-01
August 17, 2004
CR
THE GORMAN‐RUPP COMPANY DMANSFIELD, OHIO
GORMAN‐RUPP OF CANADA LIMITED DST. THOMAS, ONTARIO, CANADA Printed in U.S.A.
eCopyright by the Gorman‐Rupp Company
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
WITH PARTS LIST
SUBMERSIBLE PUMP
SBM-00192
(JD12AB60-E54 460/3)
MODEL

OM-05724 JD Series
TOC PAGE 1
TABLE OF CONTENTS
INTRODUCTION PAGE I-1...........................
SAFETY - SECTION A PAGE A-1.....................
INSTALLATION - SECTION B PAGE B-1..............
PREINSTALLATION INSPECTION PAGE B-1..................
LUBRICATION PAGE B-1.....................................
Pump Dimensions PAGE B-1.................................
Pump Motor Specifications PAGE B-3........................
PUMP INSTALLATION PAGE B-3.............................
Lifting PAGE B-3.........................................
Positioning the Pump PAGE B-3............................
Piping. PAGE B-3........................................
ELECTRICAL CONNECTIONS PAGE B-3......................
Field Wiring Connections (Incoming Power) PAGE B-4........
Motor Cable Grounding Test PAGE B-4.....................
Conductor Identification PAGE B-5.........................
Control Box Connections PAGE B-5........................
IEC TO NEMA Cross‐Reference PAGE B-5..................
Wiring Diagram PAGE B-6.................................
Liquid Level Devices PAGE B-7............................
OPERATION - SECTION C PAGE C-1................
PERFORMANCE CURVE PAGE C-1...........................
PUMP OPERATION PAGE C-2................................
Liquid Temperature and Overheating. PAGE C-2.............
Impeller Rotation PAGE C-2...............................
STARTING, STOPPING, AND OPERATIONAL CHECKS PAGE C-3
Starting PAGE C-3........................................
Stopping PAGE C-3......................................
Operational Checks PAGE C-3.............................
Cold Weather Preservation PAGE C-4.......................
TROUBLESHOOTING - SECTION D PAGE D-1........
TROUBLESHOOTING CHART PAGE D-1......................
ELECTRICAL TESTING PAGE D-2............................
Test Equipment PAGE D-2.................................
Voltage Imbalance PAGE D-3..............................
Motor and Power Cable Continuity PAGE D-3................
Insulation Resistance PAGE D-3............................

JD Series OM-05724
PAGE 2 TOC
MAINTENANCE AND REPAIR - SECTION E PAGE E-1.
PARTS LISTS:
Pump Model PAGE E-3...................................
Motor Assembly PAGE E-5................................
PUMP AND MOTOR DISASSEMBLY PAGE E-6.................
PUMP END DISASSEMBLY PAGE E-6.........................
Removing Pump From Stand PAGE E-6.....................
Suction Cover and Volute Casing Removal PAGE E-6........
Impeller Removal PAGE E-7...............................
Lower Seal Removal PAGE E-7............................
PUMP END REASSEMBLY PAGE E-7.........................
Lower Seal Installation PAGE E-7...........................
Impeller Installation PAGE E-8.............................
Volute Casing and Suction Cover Installation PAGE E-8.......
Impeller Clearance and Final Assembly PAGE E-8............
Securing Pump to Stand PAGE E-8.........................
MOTOR DISASSEMBLY PAGE E-9...........................
Upper Seal Removal PAGE E-9............................
Bearing Removal PAGE E-9...............................
Motor Cover Removal and Disassembly PAGE E-10...........
INSPECTION AND CLEANING PAGE E-10......................
Bearings PAGE E-11......................................
Other Reusable Parts (Except Seal Assemblies) PAGE E-11....
Cleaning Seal Assemblies PAGE E-11.......................
MOTOR REASSEMBLY PAGE E-12.............................
Motor Cover Reassembly and Installation PAGE E-12..........
Bearing Installation PAGE E-13.............................
Upper Seal Installation PAGE E-14..........................
SEAL TESTING PAGE E-15....................................
LUBRICATION PAGE E-16.....................................
Draining Oil PAGE E-16....................................
Condition of Oil PAGE E-17.................................
Adding Oil PAGE E-17.....................................

OM-05724 JD Series
PAGE I - 1INTRODUCTION
INTRODUCTION
This Installation, Operation, and Maintenance
Manual is designed to help you achieve the best
performance and longest life from your Gorman‐
Rupp J Series submersible pump.
The manual applies only to the submersible pump
model listed on the cover and in MAINTENANCE
AND REPAIR - SECTION E.
This J Series pump is driven by a waterproof sub
mersible electric motor. The pump motor must be
operated through an appropriate control box
matching the voltage and other characteristics of
the motor. The control box must also provide for
proper operation of the motor protection devices
such as the integral moisture and thermal
switches. Control boxes and other control devices
other than those integral to the pump motor are not
covered in this manual. Refer to other literature ac
companying the pump.
Pump construction is cast iron, with stainless steel
shaft and hardware. This pump will handle solids
up to 5.7 inches (145 mm) in diameter.
This pump is equipped with a cooling jacket, which
does not require an outside source of cooling wa
ter; liquid being pumped is forced through a nar
row opening behind the impeller and circulated
through the cooling jacket. The pump is designed
to operate in a fixed piping system in a dry pit. Be
cause of its waterproof integrety, the pump will
continue to operate if the dry pit becomes flooded.
If there are any questions regarding the pump or
motor which are not covered in this manual or in
other literature accompanying this unit, please
contact your Gorman‐Rupp distributor or the Gor
man‐Rupp Company:
The Gorman‐Rupp Company
P.O. Box 1217
Mansfield, Ohio 44901-1217
Phone: [phone]
or:
Gorman‐Rupp of Canada Limited
70 Burwell Road
St. Thomas, Ontario N5P 3R7
Phone: [phone]
The following are used to alert personnel to proce
dures which require special attention, to those
which could damage equipment, and to those
which could be dangerous to personnel:
Immediate hazards which WILL result in
severe personal injury or death. These
instructions describe the procedure re
quired and the injury which will result
from failure to follow the procedure.
Hazards or unsafe practices which
COULD result in severe personal injury
or death. These instructions describe
the procedure required and the injury
which could result from failure to follow
the procedure.
Hazards or unsafe practices which COULD
result in minor personal injury or product or
property damage. These instructions de
scribe the requirements and the possible
damage which could result from failure to
follow the procedure.
NOTE
Instructions to aid in installation, operation, and
maintenance or which clarify a procedure.

OM-05724 JD Series
PAGE A - 1SAFETY
SAFETY - SECTION A
The following information is specific to the Gor
man‐Rupp J Series Submersible pump listed on
the cover and in MAINTENANCE AND REPAIR -
SECTION E. They apply throughout this manual
to the instructions contained in the pages which
follow.
In addition to this manual, see the separate litera
ture covering the control box and other control ac
cessories which will be used with this pump. This
literature contains essential information on install
ing and operating the pump, and on making elec
trical connections.
Before attempting to install, operate, or
service this pump, familiarize yourself
with this manual, and with all other liter
ature shipped with the pump. Unfamil
iarity with all aspects of pump operation
covered in this manual could lead to de
struction of equipment, injury, or death.
This pump is designed to handle raw
sewage and industrial wastes at tem
peratures of 104_F (40_C); do not apply
at higher temperatures. Do not attempt
to pump volatile, flammable, or corro
sive liquids which may damage the
pump or endanger personnel as a result
of pump failure.
The electrical power used to operate
this pump is high enough to cause inju
ry or death. Obtain the services of a qu
alified electrician to make all electrical
connections.
Do not connect the pump motor directly
to the incoming power lines. The pump
motor is designed to operate through a
Gorman‐Rupp approved control box
which provides overload protection and
power control; otherwise, the pump
warranty will be voided. Make certain
that the pump and control box are prop
erly grounded and that the incoming
power matches the requirements of the
pump and controls. Install and operate
the control box in accordance with the
National Electric Code and all local
codes. Failure to follow the instructions
in this warning could result in injury or
death to personnel.
Do not attempt to lift this pump by the
motor power cable or the piping. Attach
proper lifting equipment to the lifting
handle, and make certain that the hook
of the lifting device is securely posi
tioned in the apex of the handle. If
chains or cables are wrapped around
the pump to lift it, make certain that they
are positioned so as not to damage the
pump, and so that the load will be bal
anced.
After the pump has been installed, make
certain that the pump and all piping or
hose connections are secure before op
eration. Loose connections can result in
damage to equipment and serious inju
ry to personnel.

JD Series OM-05724
SAFETYPAGE A - 2
The following precautions should be
taken before attempting to open or ser
vice the pump; otherwise, injury or
death could result.
1. Lock out the power to the control
panel to ensure that the pump will
remain inoperative.
2. Allow the pump to completely cool
if overheated.
3. Close the discharge valve (if
used).
If this pump is used to handle sewage,
take necessary precautions during
maintenance and repair to prevent per
sonal contamination which could result
in illness.

OM-05724 JD Series
PAGE B - 1INSTALLATION
INSTALLATION - SECTION B
Review all SAFETY information in Section A.
This section is intended only to summarize recom
mended installation practices for this pump. If
there are any questions concerning your specific
installation, contact your Gorman‐Rupp distributor
of the Gorman‐Rupp Company.
Automatic liquid level controls are available from
Gorman‐Rupp as options. For information on in
stalling and operating these controls, see the tech
nical data accompanying them.
PREINSTALLATION INSPECTION
The pump assembly was inspected and tested be
fore shipment from the factory. Before installation,
check for damage which may have occurred dur
ing shipment. Check as follows:
a. Inspect the pump and engine for cracks,
dents, damaged threads, and other obvious
damage.
b. Check for and tighten loose attaching hard
ware. Since gaskets tend to shrink after dry
ing, check for loose hardware at mating sur
faces.
c. The standard pump is provided with 26 ft. (8
m.) of power cable. Inspect the cable for cuts
or damage.
d. Check that amperes, phase, voltage, and
Hertz indicated on the motor name plate
match the ratings on the control box.
e. Carefully read all tags, decals, and markings
on the pump assembly, and perform all duties
indicated.
f. Check for any oil leaks. If there is any indica
tion of an oil leak, see LUBRICATION in
MAINTENANCE AND REPAIR - SECTION
E.
LUBRICATION
The shaft seal is lubricated by oil in the seal hous
ing (see LUBRICATION in MAINTENANCE AND
REPAIR - SECTION E).
The shaft bearings are grease lubricated.
There is no other lubrication in the pump.
Pump Dimensions
See Figure B‐1 for the approximate physical di
mensions of this pump.

JD Series OM-05724
PAGE B - 2 INSTALLATION
FIGURE B-1. PUMP DIMENSIONS

OM-05724 JD Series
PAGE B - 3INSTALLATION
Pump Motor Specifications
The motor furnished with this pump is a 60 Hz.,
Squirrel Cage, Induction Start, G‐R Frame Size No.
9; Class F Insulation Rated 155_C (311_F), 40_C
(104_F) ambient, plus 115_C (239_F) temperature
rise.
See Table B-1 for motor specifications.
TABLE B‐1. PUMP MOTOR SPECIFICATIONS
MODEL VOLTAGE SIZE
RPM
MOTOR MAX NO LOCKEDH.P.
NUMBER LOAD LOAD ROTOR
JD12AB60-E54 460/3 12”
/PHASE
54 870 74.5A 33.0A 402.3A
PUMP INSTALLATION
Lifting
Pump unit weights will vary depending on the
mounting and drive provided. Check the shipping
tag on the unit packaging for the actual weight, and
use lifting equipment with appropriate capacity.
Drain the pump and remove all customer‐installed
equipment such as suction and discharge hoses
or piping before attempting to lift existing, installed
units.
Positioning the Pump
NOTE
Before installing and operating the pump, check
the direction of impeller rotation to ensure that the
pump is properly wired at the control box. See IM
PELLER ROTATION, SECTION C.
This pump is designed to be operated mounted on
a stand with an optional suction elbow. See FIG
URE B-1 for a typical stand/elbow installation.
1. See FIGURE E-1 in MAINTENANCE AND
REPAIR - SECTION E, during pump installa
tion.
2. Install and secure the stand (26) in the floor of
the dry pit.
3. Secure the suction flange (150) to the suction
piping.
4. Secure the volute discharge flange to the sys
tem discharge piping.
Make certain that the pump and stand sit level in
the wet well.
Piping
NOTE
Refer to PERFORMANCE CURVES in OPERA
TION - SECTION C when determining the most ef
ficient piping installation.
The volute discharge is 12 inches in diameter. Ei
ther hose or rigid pipe may be used to make dis
charge connections.
Both suction and discharge lines must be inde
pendently supported to avoid vibration and strain
on the pump. For maximum pumping capacity,
keep the lines as short and straight as possible. El
bows and fittings used in a discharge line increase
friction losses; minimize their use.
It is recommended that a check valve or throttling
valve be installed in the discharge line to control si
phoning or back flow when the pump is shut off.

JD Series OM-05724
PAGE B - 4 INSTALLATION
ELECTRICAL CONNECTIONS
Install and operate this pump in accor
dance with the National Electrical Code
and all local codes. Have a qualified
electrician perform all checks and con
nections in this section.
Never attempt to alter the length of the
pump motor cable or to repair it with a
splice. The power cable and pump mo
tor must be kept completely waterproof.
Serious damage to the pump and injury
or death to personnel can result from
any alteration to the cable.
Field Wiring Connections (Incoming Power)
Field wiring is not provided with this pump, and
must be supplied by the user. The field wiring must
be of the proper size and type to ensure an ade
quate voltage supply to the pump. Voltage avail
able at the motor must be within the range indi
cated in Table B‐2.
NOMINAL
VOLTAGE
TABLE B‐2. MOTOR VOLTAGE LIMITS
PHASE MINIMUM
VOLTAGE
MAXIMUM
VOLTAGE
3460/3 420 500
Use conduit cable clamps to secure the incoming
field wiring to the control box. Make certain all con
nections are tight. If necessary, support the cable
weight to prevent excessive strain on cable clamps
and cable.
FIGURE B-2. FIELD CONNECTIONS
Motor Cable Grounding Test
Do not connect the pump control cable
to the control box or incoming voltage
before verifying the pump ground;
otherwise, personnel will be exposed to
serious injury or death.

OM-05724 JD Series
PAGE B - 5INSTALLATION
Connect one lead of lamp, bell or similar testing de
vice to motor cable green/yellow ground lead.
Connect second test lead to an uninsulated point
on the pump body. The test circuit should close.
If the test circuit does not close there is a defect in
the cable or motor which must be corrected.
Conductor Identification
The conductors in the pump cable are labeled
when shipped from the factory. If the conductors
are shortened in the field, resulting in loss of identi
fication markers, they can still be identified by their
location relative to the ground wire.
Refer to FIGURE B-3 at the end of this section; as
seen from the free end of the cable, the conductor
immediately adjacent to and clockwise from
ground (green/yellow) is assigned number T1 (T4),
the next clockwise conductor T2 (T5), etc.
If the conductors are re‐labled, they should be
identified with wire markers from the factory.
Control Box Connections
The pump warranty is void if the motor is
not operated through a control box. Since
proper operation of this pump depends on
the quality and performance of the electri
cal controls, the pump warranty is valid
only when the controls installed have been
approved by Gorman‐Rupp.
This pump is shipped completely wired for the volt
age shown on the nameplate, and is ready for op
eration through an approved control box.
Ground the control box in accordance with the in
structions accompanying it.
Control leads P1 and P2 provide the motor with
moisture and thermal protection. Note that thermal
protection is supplementary only; separate Class
10 overload relays are required for motor running
protection.
The thermal protection contacts will auto
matically reclose when the motor cools to
the established safe operating tempera
ture. Whenever automatic restarting is not
desirable, connect only to controls which
are wired for manual restart.
Wiring Diagram
A complete schematic diagram for the motor wir
ing is shown in FIGURE B-3.

JD Series OM-05724
PAGE B - 6 INSTALLATION
FIGURE B-3. MOTOR WIRING DIAGRAM
Liquid Level Devices
Optional controls available from Gorman‐Rupp
may provide a means to automatically regulate the
liquid level. These control boxes may be con
nected to the following sensing devices which per
form either filling or dewatering functions (see FIG
URE B-4).
The internal wiring of the sensing devices
are different for filling and dewatering func
tions. Be sure to follow the instructions in
cluded with the option before making con
nections.
SDiaphragm Type: two fixed‐position sen
sors (upper and lower) each contain a dia
phragm which flexes with changes in liquid
level, thus activating an enclosed miniature
switch.
SBulb (Float) Type: a bulb raises or lowers
(floats) with the liquid level, thus activating
an enclosed miniature switch.

OM-05724 JD Series
PAGE B - 7INSTALLATION
Other types of liquid level devices may also be
used. Consult the factory for the liquid level device
best suited for your application.
Liquid level devices must be positioned far
enough to allow 6 minutes between starts.
If the pump motor cycles more than 10
starts per hour, it will over‐heat, resulting in
damage to the motor windings or control
box components.
PUMP
CONTROL BOX
LIQUID LEVEL
RANGE
ON (FILLING)
TO LEVEL CONTROL CIRCUIT
IN MAIN CONTROL BOX
BULB (FLOAT TYPE)
OFF
DEWATERING
PUMP
CONTROL BOX
TO LEVEL CONTROL CIRCUIT
IN MAIN CONTROL BOX
LIQUID LEVEL
RANGE
OFF
DEWATERING
ON (FILLING)
DIAPHRAGM TYPE
FIGURE B-4. LIQUID LEVEL DEVICES

OM-05724 JD Series
PAGE C - 1
OPERATION
OPERATION - SECTION C
PERFORMANCE CURVE
In the performance curve which follows, perform
ance is based on 70_F (21_C) clear water at sea
level. The performance of your pump may be differ
ent due to such factors as viscosity, specific grav
ity, elevation, temperature, and impeller trim.
NOTE
This curve applies to standard production models.
If your pump serial number is followed by an “N”,
your pump is not a standard production model.
Contact the Gorman‐Rupp Company to verify per
formance.
PERFORMANCE CURVE - SBM-00192 (JD8AA60-E94 460/3)

JD Series OM-05724
PAGE C - 2 OPERATION
Review all SAFETY information in Section A.
Follow the instructions on all tags, labels and
decals attached to the pump.
CONTROLS
The pump warranty is void if the motor is
not operated through a control box ap
proved by Gorman‐Rupp.
See the operating instructions furnished with the
control box, and with other optional accessories
and controls, before attempting to start the pump.
PUMP OPERATION
Liquid Temperature and Overheating.
Standard versions of this pump will handle
liquids with temperatures up to 104_F
(40_C) maximum. Do not install in service
with higher liquid temperatures; otherwise,
pump components and operation may be
affected.
Overheated pumps can cause severe
burns and injury. If the pump becomes
overheated:
1. Stop the pump immediately.
2. Allow the pump to completely cool.
3. Refer to instructions in this manual
before restarting the pump.
Overheating can occur if the pump is misapplied; if
the control box fails to provide overload or thermal
protection, or if the pump is operated against a
closed discharge valve for an extended period of
time.
Do not start the pump more than 10 times
per hour. If the motor does not cool be
tween starts it will overheat, resulting in
damage to the motor windings or control
box components.
These pumps are equipped with cooling jackets,
which do not require an outside source of cooling
water; liquid being pumped is forced through a
narrow opening behind the impeller and circulated
through the cooling jacket.
Impeller Rotation
Refer to Figure C-1, and check impeller rotation
as follows before installing the pump in a wet well.
FIGURE C-1. PUMP ROTATION
While checking impeller rotation, secure
the pump to prevent the motor power
cable from coiling.

OM-05724 JD Series
PAGE C - 3
OPERATION
Suspend the pump by the lifting handle. Apply
power briefly and note the direction of pump twist.
As viewed from the top, the pump should twist in a
counterclockwise direction; this will indicate that
impeller rotation is correct.
If the pump twists in a clockwise direction, impeller
rotation is incorrect. Have qualified personnel inter
change the control box connections of any two
pump motor power leads. Recheck pump twist; it
should now be in a counterclockwise direction.
STARTING, STOPPING, AND OPERATIONAL
CHECKS
Starting
Do not attempt to operate the pump until
impeller rotation has been checked; other
wise, the pump will be damaged.
Follow the control box manufacturer's instructions,
start the pump, and run any recommended
checks.
Stopping
Follow the control box manufacturer's instructions
for stopping the pump.
The integral thermal overload device
will shut off the motor if the temperature
rises above design limits. When the
pump cools and the temperature falls
below these limits, the motor will restart
automatically. To avoid the hazards of
an unexpected motor start‐up, do not at
tempt to handle or service the pump un
less all power to the motor has been
shut off at the control box; otherwise,
serious personal injury could result.
During motor shutoff by the thermal
overload device, control box circuits re
main live. Do not attempt to service any
control box components unless in com
ing power has been shut off.
After stopping the pump, be sure to perform all re
quired maintenance and preservation procedures.
Operational Checks
To detect minor problems, check the pump for
proper operation when it is first started and at peri
odic intervals.
To avoid serious damage to the pump,
check for unusual noises or excessive vi
bration while the pump is running. If noise
or vibration is excessive, stop operation
and refer to the Troubleshooting Chart in
Section D.
The suction inlet or impeller may become clogged
with debris. In some cases, stopping the pump
momentarily may backflush this blockage. If back
flushing does not clear the debris, remove the
pump from the wet well, disconnect power, and
clear manually.
Never introduce air or steam pressure
into the pump casing to remove a block
age. This could result in personal injury
or damage to the equipment. If back
flushing is absolutely necessary, limit
liquid pressure input to 50% of the maxi
mum permissible operating pressure
shown on the Pump Performance
Curve.
Check the pump for overheating. Overheating can
occur if the pump is misapplied, required to start
repeatedly, if the control box fails to provide over
load or thermal protection, or if the pump is oper

JD Series OM-05724
PAGE C - 4 OPERATION
ated against a closed discharge valve for an ex
tended period of time.
Do not start the pump more than 10 times
per hour. If the motor does not cool be
tween starts it will overheat, resulting in
damage to the motor windings or control
box components.
Cold Weather Preservation
The pump will not freeze as long as the casing is
submerged in liquid. If the casing is not sub
merged, or if the liquid begins to freeze, remove the
pump from the wet well and dry it thoroughly. Run
the pump for two or three minutes to dry the inner
walls.
If the pump does freeze while it is out of the liquid,
submerge it until thawed; if the liquid is near freez
ing, the pump must be submerged for an extended
period of time. Check thawing by starting the pump
and checking that the shaft rotates freely. If the
pump remains frozen allow additional thawing time
before attempting to restart.
If submerging does not thaw the pump, move it
into a warm area until completely thawed.
Do not attempt to thaw the pump by us
ing a torch or other source of flame. This
could damage O‐rings or heat the oil in
the seal housing above critical tempera
tures, causing the pump to rupture or
explode.

OM-05724 JD Series
PAGE D - 1
TROUBLESHOOTING
TROUBLESHOOTING - SECTION D
Review all SAFETY information in Section A. NOTE
Many of the probable remedies listed in the TROU
BLESHOOTING CHART require use of electrical
test instruments; for specific procedures, see
ELECTRICAL TESTING at the end of the chart.
TROUBLESHOOTING CHART
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
IMPELLER JAMMED. CHECK IMPELLER; DISASSEMBLE
AND REPAIR AS NECESSARY.
MOTOR, VOLTAGE OR CONTROL CHECK RATINGS ON PUMP NAMEPLATE
BOX INCOMPATIBLE; DEFECTIVE AND CONTROL BOX; CHECK INCOMING
CONNECTIONS VOLTAGE; CHECK CONNECTIONS.
MOTOR CABLE DAMAGED CHECK PER ELECTRICAL TESTING.
CONTROL BOX CURRENT INTER‐
RUPTING OR MOISTURE-SENSING
DEVICES TRIPPED.
CHECK CONTROL BOX; CHECK FOR
LEAKING SHAFT SEALS, CUT O-RINGS,
OR MOISTURE WICKING THROUGH
OR CABLE.
CHECK CONTINUITY PER ELECTRICAL
TESTING.
MOTOR OVERHEATED, THERMAL
SWITCHES TRIPPED.
ALLOW MOTOR TO COOL.
VOLTAGE TOO LOW OR TOO HIGH; CHECK INCOMING VOLTAGE; CHECK
WIRING SIZE, TYPE AND LENGTH. (SEE
INSTALLATION - SECTION B.
EXCESSIVE VOLTAGE DROP BE-
TWEEN PUMP AND CONTROL BOX.
MOTOR RUNS
BUT DOES
NOT DELIVER
RATED DIS
CHARGE.
PUMP FAILS TO
START.
DISCHARGE HEAD TOO HIGH. REDUCE DISCHARGE HEAD, OR INSTALL
STAGING ADAPTER AND ADDITIONAL
PUMP.
DISCHARGE THROTTLING VALVE OPEN DISCHARGE VALVE FULLY; CHECK
PARTIALLY CLOSED; CHECK VALVE PIPING INSTALLATION.
IMPROPERLY INSTALLED.
OPEN CIRCUIT IN MOTOR WINDINGS
(CONT.)
NO POWER TO MOTOR. CHECK FOR BLOWN FUSE OR OPEN
CIRCUIT BREAKER
CABLE.
PUMP RUNNING BACKWARD. CHECK IMPELLER ROTATION (SEE
SECTION C).
IMPELLER WORN OR DAMAGED. REPLACE.
LIQUID BEING PUMPED TOO THICK. DILUTE LIQUID IF POSSIBLE.
IMPELLER OR DISCHARGE LINE
CLOGGED.
CLEAR

JD Series OM-05724
PAGE D - 2 TROUBLESHOOTING
TROUBLESHOOTING CHART (cont'd)
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
MOTOR RUNS,
BUT DOES NOT
DELIVER RATED
DISCHARGE.
INSUFFICIENT LIQUID IN WET WELL. STOP PUMP UNTIL LIQUID LEVEL RISES.
IMPELLER ROTATING IN WRONG DI-
RECTION.
CHECK IMPELLER ROTATION (SEE SEC-
TION C).
CLOGGED SUCTION PORT OR IM-
PELLER CAUSING MOTOR OVER-
LOAD.
CLEAR BLOCKAGE; RESET OVERLOAD
DEVICE IN CONTROL BOX.
MOTOR OVERHEATED; THERMAL
SWITCH TRIPPED.
ALLOW PUMP TO COOL.
MOISTURE SENSING DEVICE TRIP-
PED.
DISASSEMBLE PUMP AND LOCATE LEAK.
MOTOR BEARINGS DEFECTIVE. DISASSEMBLE PUMP AND CHECK
MOTOR CABLE DAMAGED. CHECK PER ELECTRICAL TESTING.
INSUFFICIENT LIQUID IN WET WELL. STOP PUMP UNTIL LIQUID LEVEL RISES.
PUMP STARTS
THEN SHUTS
OFF.
EXCESSIVE
NOISE OR VIBRA
TION.
IMPELLER CLOGGED. CLEAR BLOCKAGE
IMPELLER LOOSE OR DAMAGED. CHECK IMPELLER; REPLACE IF
NECESSARY.
MOTOR SHAFT OR BEARINGS REPLACE
DEFECTIVE.
PUMPING ENTRAINED AIR. CHECK WET WELL LIQUID LEVEL.
PUMP OPERATING OUTSIDE DE-
SIGNED OPERATING RANGE.
CHECK DISCHARGE HEAD AND FLOW:
ADJUST AS REQUIRED TO MEET PER-
FORMANCE SPECIFICATIONS.
(CONT.)
ELECTRICAL TESTING
Make the electrical checks which follow to deter
mine if pump malfunctions are being caused by
problems in the motor or in the motor cable.
Test Equipment
A volt/amp/ohmmeter and megohmmeter of ade
quate range and quality are required to conduct
the electrical
tests which follow. use the commercial equipment
listed below, or equivalent substitutes.
Refer to the wiring diagram(s) accompany
ing the motor and control box before re
connecting any electrical leads which have
been disconnected. Connections to the

OM-05724 JD Series
PAGE D - 3
TROUBLESHOOTING
wrong terminals may damage the motor
and/or control devices.
Equipment Use
Ammeter To check AC Voltage
and current (amperage)
Ohmeter To measure resistance
(ohms) to ground
Voltage Imbalance
Use a voltmeter to read each phase of the incom
ing 3 phase power. Each phase must balance with
the other two as closely as can be measured with a
commercial instrument. If the phases are out of
balance, contact your power company. If the
phases are balanced, check out the motor as de
scribed in the following steps:
a. Use a voltmeter, Amprobe, or equivalent in
strument to read the voltage of incoming
power lines 1 and 2, 2 and 3, and 1 and 3 at the
control box. Voltage must match as closely as
can be measured. If possible, measure the
voltage at the control box with:
1. The pump shut off.
2. The pump running in air.
3. The pump submerged and running under
full load.
The voltage measured under each condition
must be the same.
b. If voltage is balanced when the pump is off but
is imbalanced when the pump is running,
thoroughly check the power source, all inter
connecting cables, and the pump motor to
isolate the defect.
c. Use an Amprobe or equivalent instrument to
measure the current draw (amperage) of
each phase while the pump is running under
full load, and with no load. In each condition,
the amperage readings for all three phases
must match as closely as can be measured.
Normal amperage values are listed in Table 1,
Section B; these values apply only when the
voltage at the site is the normal voltage listed.
Motor and Power Cable Continuity
Set the megohmmeter at R x 1 scale and zero‐ba
lance it. Test as follows:
a. Shut off incoming power to the control box,
and disconnect the motor power cable leads.
Connect the megohmmeter test leads to any
two power cable leads, and note the
megohmmeter reading. A high resistance
reading indicates an open or broken circuit in
the power cable or motor windings, or a bad
connection between the motor and cable.
b. Repeat Step a. with each set of leads. The
three readings shall be as close as can be
measured.
c. If readings indicate that continuity problems
exist in the motor or motor cable, the motor
must be returned to the factory or to a U/L‐ap
proved facility.
Insulation Resistance
Set the megohmmeter at R x 100, and zero‐ba
lance it. Test as follows:
a. Shut off incoming power to the control box,
and disconnect the motor power cable leads.
Connect one megohmmeter test lead to the
motor cable green/yellow ground lead. Touch
the other test lead to each of the motor cable
leads in turn. Note the readings.
b. Readings will indicate resistance values in
both the power cable and motor windings.If
resistance reads infinity (1), insulation is
good. If resistance reads between infinity (1),
and 1 megohm, insulation is acceptable but
should be rechecked regularly. If resistance
reads less than 1 megohm, insulation should
be checked more closely and frequently.
c. If readings indicate that a ground exists, test
the stator and motor power cable separately.
Replace as required.