Gormann-Rupp Pumps S Series Application guide

OM-07325-07
February 18, 2020
GORMAN‐RUPP PUMPS
www.grpumps.com
e2020 Gorman‐Rupp Pumps Printed in U.S.A.
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
WITH PARTS LIST
S SERIES
SUBMERSIBLE PUMP
MODEL
S2A1 115V 1P

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Please record your pump model and serial number in the
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needs this information when you require parts or service.
Pump Model:
Serial Number:

TABLE OF CONTENTS
i
INTRODUCTION PAGE I - 1.................................................
SAFETY ‐ SECTION A PAGE A - 1............................................
INSTALLATION - SECTION B PAGE B - 1....................................
GENERAL INFORMATION PAGE B - 1..................................................
Pump Model Designation PAGE B - 1...............................................
PREINSTALLATION INSPECTION PAGE B - 1............................................
PUMP SEAL PAGE B - 1..............................................................
LUBRICATION PAGE B - 1.............................................................
PUMP INSTALLATION PAGE B - 2......................................................
Pump Motor Specifications PAGE B - 2..............................................
Pump Dimensions PAGE B - 2.....................................................
Lifting PAGE B - 3.................................................................
Positioning of Pump PAGE B - 3....................................................
Piping PAGE B - 4................................................................
ELECTRICAL CONNECTIONS PAGE B - 4...............................................
Control Box Installation PAGE B - 5.................................................
Dual Voltage Usage PAGE B - 5....................................................
Field Wiring Connections (Incoming Power) PAGE B - 5...............................
Grounding Methods PAGE B - 6....................................................
Pump Power Cable Connections PAGE B - 7.........................................
Control Box Specifications PAGE B - 8..............................................
Motor Cable Grounding Test PAGE B - 8.............................................
Liquid Level Devices PAGE B - 8....................................................
WIRING DIAGRAMS PAGE B - 10.......................................................
OPERATION - SECTION C PAGE C - 1......................................
PRIMING PAGE C - 1.................................................................
Hand Primers PAGE C - 1..........................................................
STARTING PAGE C - 1................................................................
OPERATION PAGE C - 2..............................................................
Leakage PAGE C - 2..............................................................
Liquid Temperature And Overheating PAGE C - 2.....................................
Strainer Check PAGE C - 2.........................................................
Pump Vacuum Check PAGE C - 2..................................................
STOPPING PAGE C - 2................................................................
Cold Weather Preservation PAGE C - 2..............................................
BEARING TEMPERATURE CHECK PAGE C - 3..........................................
TROUBLESHOOTING - SECTION D PAGE D - 1..............................
PREVENTIVE MAINTENANCE PAGE D - 3...............................................

TABLE OF CONTENTS
(continued)
ii
PUMP MAINTENANCE AND REPAIR ‐ SECTION E PAGE E - 1.................
STANDARD PERFORMANCE CURVE PAGE E - 1........................................
PARTS LISTS:
Pump Model PAGE E - 3..........................................................
Terminal Housing and Cable Assembly PAGE E - 5...................................
PUMP END DISASSEMBLY PAGE E - 6.................................................
Strainer and Wear Plate Removal PAGE E - 7........................................
Draining Oil From Seal Cavity PAGE E - 7............................................
Draining Oil From Motor Cavity PAGE E - 7..........................................
Positioning Pump For Disassembly PAGE E - 7.......................................
Impeller Removal PAGE E - 7......................................................
Diffuser Removal PAGE E - 7.......................................................
Seal Removal PAGE E - 8..........................................................
PUMP END REASSEMBLY PAGE E - 8..................................................
Cleaning and Inspection of Pump Parts PAGE E - 8...................................
Seal Installation PAGE E - 9........................................................
Diffuser Installation PAGE E - 10.....................................................
Impeller Installation PAGE E - 10.....................................................
Wear Plate Reassembly PAGE E - 11.................................................
Impeller Clearance PAGE E - 11.....................................................
Strainer Installation PAGE E - 11.....................................................
MOTOR DISASSEMBLY PAGE E - 11....................................................
Terminal Housing and Power Cable Removal and Disassembly PAGE E - 11..............
Rotor Removal PAGE E - 12.........................................................
Bearing Removal PAGE E - 12.......................................................
Stator Removal PAGE E - 13........................................................
Relief Valve PAGE E - 13............................................................
Hoisting Bail PAGE E - 14...........................................................
MOTOR REASSEMBLY PAGE E - 14.....................................................
Stator Installation PAGE E - 14......................................................
Bearing Installation PAGE E - 15.....................................................
Rotor and Installation PAGE E - 15...................................................
Terminal Housing and Power Cable Reassembly ans Installation PAGE E - 16.............
Sealing Terminal Housing Connections With Silicone Adhesive PAGE E - 16..............
Sealing Terminal Plate Connections With Potting Compound PAGE E - 18................
Terminal Housing Installation PAGE E - 19............................................
FINAL ASSEMBLY PAGE E - 19.........................................................
VACUUM / PRESSURE TESTING PAGE E - 19............................................
LUBRICATION PAGE E - 20.............................................................
Seal Cavity PAGE E - 20............................................................
Motor Housing Cavity PAGE E - 21...................................................

S SERIES PUMPS OM-07325
PAGE I - 1INTRODUCTION
INTRODUCTION
Thank You for purchasing a Gorman‐Rupp pump.
Read this manual carefully to learn how to safely
install and operate your pump. Failure to do so
could result in personal injury or damage to the
pump.
This manual will alert personnel to known proce
dures which require special attention, to those
which could damage equipment, and to those
which could be dangerous to personnel. However,
this manual cannot possibly anticipate and provide
detailed precautions for every situation that might
occur during maintenance of the unit. Therefore, it
is the responsibility of the owner/maintenance per
sonnel to ensure that only safe, established main
tenance procedures are used, and that any proce
dures not addressed in this manual are performed
only after establishing that neither personal safety
nor pump integrity are compromised by such prac
tices.
If there are any questions regarding the pump or
its application which are not covered in this man
ual or in other literature accompanying this unit,
please contact your Gorman‐Rupp distributor, or
the Gorman‐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]
For information or technical assistance on the pow
er source, contact the power source manufactur
er's local dealer or representative.
The following are used to alert maintenance per
sonnel to procedures which require special atten
tion, 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
describe the requirements and the possi
ble 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-07325 S SERIES PUMPS
PAGE A - 1SAFETY
SAFETY - SECTION A
This information applies to the S Series
submersible motor driven pumps and
control boxes.
Because pump installations are seldom
identical, this manual cannot possibly
provide detailed instructions and pre
cautions for each specific application.
Therefore, it is the owner/installer's re
sponsibility to ensure that applications
not addressed in this manual are per
formed only after establishing that nei
ther operator safety nor pump integrity
are compromised by the installation.
Before attempting to open or service the
pump:
1. Familiarize yourself with this man
ual.
2. Lock out incoming power to the
control box to ensure that the
pump will remain inoperative.
3. Allow the pump to completely cool
if overheated.
5. Close the discharge valve (if
used).
This pump is not designed to pump vol
atile, explosive, or flammable materials.
Do not attempt to pump any liquids for
which you pump is not approved, or
which may damage the pump or endan
ger personnel as a result of pump fail
ure. Consult the factory for specific ap
plication data.
Before connecting any cable to the con
trol box, be sure to ground the control
box. Refer to the Control Box Manual for
the suggested grounding methods.
The pump motor is designed to be oper
ated through the control box furnished
with the pump. The control box provides
overload protection and power control.
Do not connect the pump motor directly
to the incoming power lines.
The electrical power used to operate
this pump is high enough to cause inju
ry or death. Obtain the services of a
qualified electrician to make all electri
cal connections. Make certain that the
pump and enclosure are properly
grounded; never use gas pipe as an
electrical ground. Be sure that the in
coming power matches the voltage and
phase of the pump and control before
connecting the power source. Do not
run the pump if the voltage is not within
the limits. If the overload unit is tripped
during pump operation, correct the
problem before restarting the pump.
The electrical power used to operate
this pump is high enough to cause inju
ry or death. Make certain that the control
handle on the control box is in the OFF

S SERIES PUMPS OM-07325
PAGE A-2 SAFETY
position and locked out, or that the pow
er supply to the control box has been
otherwise cut off and locked out, before
attempting to open or service the pump
assembly. Tag electrical circuits to pre
vent accidental start‐up.
Never attempt to alter the length or re
pair any power cable with a splice. The
pump motor and cable must be com
pletely waterproof. Injury or death may
result from alterations.
All electrical connections must be in ac
cordance with The National Electric
Code and all local codes. If there is a
conflict between the instructions pro
vided and N.E.C. Specifications, N.E.C.
Specifications shall take precedence.
All electrical equipment supplied with
this pump was in conformance with
N.E.C. requirements in effect on the
date of manufacture. Failure to follow
applicable specifications, or substitu
tion of electrical parts not supplied or
approved by the manufacturer, can re
sult in severe injury or death and void
warranty.
Death or serious personal injury and
damage to the pump or components
can occur if proper lifting procedures
are not observed. Make certain that
hoists, chains, slings or cables are in
good working condition and of suffi
cient capacity and that they are posi
tioned so that loads will be balanced
and the pump or components will not be
damaged when lifting. Do not attempt to
lift this pump by the motor or control
cables, or the piping. Attach proper lift
ing equipment to the lifting bail fitted on
the pump. Lift the pump or component
only as high as necessary and keep per
sonnel away from suspended objects.
After the pump has been installed, make
certain that the pump and all piping or
hose connections are secure before op
eration.
Obtain the services of a qualified elec
trician to troubleshoot, test and/or ser
vice the electrical components of this
pump.
Approach the pump cautiously after it
has been running. Although the motor is
cooled by the liquid being pumped, nor
mal operating temperatures can be high
enough to cause burns. The tempera
ture will be especially high if operated
against a closed discharge valve. Never
operate against a closed discharge
valve for long periods of time.
Do not remove plates, covers, gauges,
pipe plugs, or fittings from an over
heated pump. Vapor pressure within the
pump can cause parts being disen
gaged to be ejected with great force. Al

OM-07325 S SERIES PUMPS
PAGE A - 3SAFETY
low the pump to completely cool before
servicing.
Do not attempt to lift the pump by the
motor power cable or the piping. Attach
proper lifting equipment to the lifting
device fitted to the pump. If chains or
cable are wrapped around the pump to
lift it, make certain that they are posi
tioned so as not to damage the pump,
and so that the load will be balanced.
Pumps and related equipment must be
installed and operated according to all na
tional, local and industry standards.

S SERIES PUMPS OM-07325
PAGE B - 1INSTALLATION
INSTALLATION - SECTION B
GENERAL INFORMATION
Review all SAFETY information in Section A.
Since pump installations are seldom identical, this
section is intended only to summarize general rec
ommendations and practices required to inspect,
position, and arrange the pump and piping. If there
are any questions concerning your specific instal
lation, contact your Gorman‐Rupp distributor or
the Gorman‐Rupp Company.
Liquid level devices are available from Gorman‐
Rupp as optional equipment. For information on
installing and operating these items, refer to the lit
erature accompanying them.
Pump Model Designation
Following is a description of the model numbering
system for S Series pumps. These submersible
pumps are available in a range of sizes. Refer to the
following chart to identify the size for your specific
pump model.
S
Series
Discharge Size
Pump Hydraulics
Pump Construction
H.P. (If Shown)
Voltage/Phase
3 C 1 E 230/3- 6.2
Pump Model
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 assembly for cracks, dents,
damaged threads, and other obvious dam
age.
b. Check for loose attaching hardware. Since
gaskets tend to shrink after drying, check for
loose hardware at the mating surfaces.
c. Inspect the power cable for cuts or any other
obvious damage.
d. Check that amperes, phase, voltage and
hertz indicated on the name plate match the
ratings on the control box and incoming pow
er.
e. Carefully read all tags, decals, and markings
on the pump, and perform all duties indicated.
f. Check for oil leaks. If there is any indication of
an oil leak, see LUBRICATION at the end of
this manual.
PUMP SEAL
S Series pumps utilize one of the following sealing
methods.
1. There are two shaft seals in the pump. The
lower seal prevents liquid from entering the in
termediate cavity at the impeller end. The up
per seal prevents oil leakage from the motor
housing cavity and acts as back‐up protection
in the event of lower seal failure.
2. The pump is equipped with one double‐faced
seal assembly. It is designed to prevent the
liquid being pumped from entering the inter
mediate cavity at the impeller end, and to pre
vent moisture from entering the motor hous
ing cavity at the motor end.
Regardless of which sealing method is used, the
seal is lubricated by premium quality submersible
pump oil.
LUBRICATION
S series pumps are lubricated in one of the follow
ing methods.
1. Some pumps utilize two lubrication cavities.
The motor housing cavity provides lubrication
to the motor assembly and bearings, while the
intermediate cavity provides lubrication to the
pump seal.
2. Some pumps utilize one lubrication cavity, lo
cated just behind the seal plate. It is filled with
premium quality submersible pump oil which
lubricates the pump seal. The motor operates
in and is cooled by air, therefore it requires no
lubrication.
All S Series pumps are fully lubricated when
shipped from the factory. However, lubrication lev
els must be checked before installing the pump

OM-07325 S SERIES PUMPS
PAGE B - 2 INSTALLATION
(see LUBRICATION in the MAINTENANCE AND
REPAIR MANUAL). An additional quart (0,9 liter)
of oil is provided to “top off” the oil level in the pump
motor cavity, if so required. If the oil level is abnor
mally low, determine the cause before putting the
pump into service.
Due to differences in pump design, the quantity of
oil and manner in which oil is to be added to the
seal cavity varies between pump models. Refer to
Table B‐2 for oil capacities and positions for filling
the seal cavity in each pump. Motor cavities requir
ing lubrication should always be positioned verti
cally for filling. Refer to LUBRICATION, Section C
for lubrication specifications and intervals.
PUMP INSTALLATION
Pump Motor Specifications
See following tables for pump specifications.
Table B‐1. Pump Specifications
Dual
Voltage
Locked
Rotor
Amperes
Pump
HP/
KW
Motor
Speed
(RPM)
Full
Load
Amperes
No
Load
Amperes
Discharge
Size
(NPT)
Model Voltage/
Phase
S2A NO 3450 28 14 82 2 INCH
115/1 2 HP
Table B‐2. Additional Specifications
Pump
Model
Voltage/
Phase
115/1
Approximate
Weight - Lbs. (kg) Oil Capacity
Ounces (Liters)
Seal Cavity
Filling
Position
(H)orizontal
(V)ertical
*(A)ngle
Pump 50 Ft. Cable Seal
Cavity
Motor
Cavity
32.5 (15) 8 (0,2) 32 (1) A
* Position Pumps at Approximately 30off Vertical
S2A 62 (28)
Pump Dimensions
For the approximate physical dimensions of your
pump, refer to the pump specification data sheet
or contact your Gorman‐Rupp distributor or the
Gorman‐Rupp Company.
When installing or servicing the pump
or controls, follow all requirements for
the installation of wiring or electrical
equipment as outlined in the National
Electric Code. Follow all safety require
ments. Failure to observe these require
ments could result in injury or death to
personnel.
Do not allow the free end of the power
cable to enter the liquid being pumped.
The free end of the cable must be kept dry
to prevent liquid from wicking through the
cable and into the motor.
NOTE
Refer to the performance curve in the Parts List
Manual when determining the most efficient piping
installation. The recommended maximum sub

S SERIES PUMPS OM-07325
PAGE B - 3INSTALLATION
mergence depth is 65 feet.
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.
Refer to Table B-2 for the approximate maximum
weight for each pump.
Death or serious personal injury and
damage to the pump or components
can occur if proper lifting procedures
are not observed. Make certain that
hoists, chains, slings or cables are in
good working condition and of suffi
cient capacity and that they are posi
tioned so that loads will be balanced
and the pump or components will not be
damaged when lifting. Do not attempt to
lift this pump by the motor or control
cables, or the piping. Attach proper lift
ing equipment to the lifting bail fitted on
the pump. Lift the pump or component
only as high as necessary and keep per
sonnel away from suspended objects.
Use Only Genuine Gorman-Rupp re
placement parts. Failure to do so may cre
ate a hazard and damage the pump or di
minish optimal pump performance. Any
such hazard, damage or diminished per
formance is not covered by the warranty.
NOTE
When appropriate recycling facilities are available,
the user should recycle components and fluids
when doing any routine maintenance / repairs and
also at the end of the pump’s useful life. All other
components and fluids shall be disposed of ac
cording to all applicable codes and regulations.
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.
The pump is designed to operate fully or partially
submerged. The rotating parts are oil lubricated,
and the motor is cooled by a constant flow of liquid
or air discharged through internal passages.
As a safeguard against rupture or explosion due to
heat, models equipped with oil‐lubricated motors
are fitted with a pressure relief valve which will open
if vapor pressure within the pump motor reaches a
critical point.
The pump will operate if positioned on its side, but
this is not recommended because the motor
torque could cause the pump to roll during opera
tion.
The pump should be independently secured and
supported by the lifting device fitted on the pump.
If the application involves a lot of debris, protect the
pump from excessive wear and clogging by sus
pending it in a perforated barrel or culvert pipe. If
the bottom is heavily sludge‐covered, rest the
pump on support blocks or suspend it from a raft
or similar device near the surface of the liquid. See
Figure B-1 for typical pump installations.

OM-07325 S SERIES PUMPS
PAGE B - 4 INSTALLATION
All liquid entering the pump must pass through a
strainer screen. Any spherical solids which pass
through the screen will pass through the pump.
BY BAIL IN PERFORATED CULVERT PIPE ON SUPPORTS
Figure B-1 Typical Pump Installations
Piping
No suction piping is required in a standard installa
tion.
S Series pumps are provided with a suction strain
er to prevent large solids from clogging the impel
ler. On some models the strainer can be removed
and the pump suction “staged” to the discharge of
another pump, allowing one pump to feed the oth
er on high discharge head applications.
To determine the size of the discharge connection,
see Table B-1, Pump Specifications. Either
hose or rigid pipe may be used. To facilitate mobil
ity and maintenance, it is recommended that the
discharge line be fitted with a quick disconnect fit
ting near the pump. The discharge line must be in
dependently supported to avoid strain and vibra
tion on the pump.
Either hose or rigid pipe may be used to make dis
charge connections. For maximum pumping ca
pacity, keep the line as short and straight as pos
sible. Elbows and fittings used in discharge lines
increase friction loss, 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.
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

S SERIES PUMPS OM-07325
PAGE B - 5INSTALLATION
or death to personnel can result from
any alteration to the cable.
Control Box Installation
The pump is designed to be operated
through the control box furnished with
the pump. The control box provides
overload protection and power control.
Do not connect the pump motor directly
to the incoming power lines.
The control box is a rainproof enclosure with a pad
lockable front cover. The enclosure is not de
signed to be watertight, and should not be sub
merged. Refer to the control box manual for enclo
sure dimensions and parts.
Secure the control vertically on a level surface,
above flood level. The box should be easily acces
sible to the operator, and located close enough to
the pump to avoid excessive voltage drop due to
cable length (see Pump Power Cable Connec
tion). After the box is installed, make certain the
front cover latches properly.
Failure to mount the control box vertically
on a level surface may affect operation of
the pump controls.
Dual Voltage Usage
Some pumps are powered by a dual‐voltage motor
for utilization with high or low voltage. The motor
was originally wired and shipped from the factory
for use with the voltage indicated as “Factory
Wired” on the pump's name plate. The name plate
also indicates the dual voltage pertaining to this
motor. If the alternate voltage must be utilized, con
trol box modifications and/or certain wiring
changes are required.
The control box assembly provided with this pump
has been designed to accommodate only the volt
age indicated on the front of the box. This voltage
coincides with the “Factory Wired” voltage of the
motor. If the alternate voltage is utilized, the control
box must be replaced with another box designed
for the appropriate voltage. Alternate voltage con
trol boxes are shown in the Parts List Manual under
Pump Options.
Dual voltage pumps are wired at the fac
tory only for the voltage shown on the
name plate. Make certain that the con
trol box voltage matches the pump volt
age before using. If the pump voltage is
changed, the pump name plate must be
changed and a new control box must be
installed. Do not run the pump if the volt
ages do not match; otherwise, the pump
warranty will be negated, and damage
to the pump, and injury or death to per
sonnel can result.
The motor wiring must also be changed before uti
lizing alternate voltage. For detailed instructions on
disassembly and reassembly of the terminal hous
ing, see Terminal Housing and Power Cable Dis
assembly and Terminal Housing and Power
Cable Reassembly in the Maintenance And Re
pair manual. Change the motor leads as indicated
on the wiring diagram plate affixed to the side of the
terminal housing (see Figure B-2). Be sure to tag
the revised voltage on the pump.
LOW VOLTAGE HIGH VOLTAGE
12 3
789
456 456
789
12 3
Field Wiring Connections (Incoming Power)
The electrical power used to operate
this pump is high enough to cause inju

OM-07325 S SERIES PUMPS
PAGE B - 6 INSTALLATION
ry or death. Obtain the services of a
qualified electrician to make all electri
cal connections. Make certain that the
pump and enclosure are properly
grounded; never use gas pipe as an
electrical ground. Be sure that the in
coming power matches the voltage and
phase of the pump and control before
connecting the power source. Do not
run the pump if the voltage is not within
the limits.
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. Install and operate the
control box in accordance with the Na
tional Electric Code and all local codes.
Failure to follow these could result in in
jury or death to personnel.
Field wiring is not provided with the 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‐3.
To calculate the voltage available at the motor, pro
ceed as follows:
a. Measure the voltage across the incoming
lines (1 & 2 for single phase, 1 & 2, 2 & 3, and 1
& 3 for three phase) while the pump is oper
ating at full capacity. Refer to the literature
supplied with the control box for power supply
connections.
b. Next, subtract the motor cable voltage drop
(see Table 4, Pump Power Cable Specifica
tions).
c. Do not continue to operate the pump if this
voltage is not within the recommended limits.
Obtain the services of a qualified electrician to
determine the correct field wiring size and oth
er details to ensure an adequate voltage sup
ply to the pump.
Table B‐3. Pump Voltage Requirements
NOMINAL
VOLTAGE
3
3
230
460
210
420
250
500
PHASE
MINIMUM
VOLTAGE
MAXIMUM
VOLTAGE
1230 220 240
575 3 520 630
1115 110 120
380 3 345 415
Make certain all connections are tight and that
cable entry points are rainproof. Support the cable
weight, if required, to prevent excessive strain on
cable clamps and cable.
Grounding Methods
Electrically ground the installation before connect
ing the field wiring to the control box. Install a
grounding terminal to the enclosure and connect
it to a properly embedded electrode.
The material used for the electrode must be an ex
cellent conductor of electricity, such as copper. If
iron or steel is used, it must be galvanized or other
wise metal plated to resist corrosion. Do not coat
the electrode with any material of poor conductiv
ity, such as paint or plastic.
The electrode must conform to the recommenda
tions of N.E.C. ARTICLE 250. Follow all installation
requirements of the N.E.C., and all applicable
codes. See Figure B-3 for some suggested
grounding methods.

S SERIES PUMPS OM-07325
PAGE B - 7INSTALLATION
ROCK
8 FEET
(2,4 M)
3/4 INCH (19,1
MM) NOMINAL
DIAMETER
(MINIMUM)
3/4 INCH (19,1 MM)
NOMINAL DIAMETER
(MINIMUM) 8 FEET
(2,4 M) LONG
SOIL
SOIL
SOIL
1/4 INCH (6,4 MM)
STEEL PLATE 2 SQ.
FEET (1858,1 SQ. CM)
SURFACE AREA
(MINIMUM)
a) PLATE ELECTRODE b) DRIVEN ELECTRODE c) BURIED ELECTRODE
Figure B-3. Suggested Grounding Methods
a. Plate Electrode: An iron or steel plate, 1/4
inch (6,4 mm) thick, completely impeded in
the ground. The plate must present a surface
area of at least 2 square feet (1858,1 sq. cm.).
b. Driven Electrode: A rod or pipe, 3/4 inch
(19,1 mm) in diameter minimum, 8 feet (2,4 m)
long, completely driven into the ground.
c. Buried electrode: If rock or stone prevents
embedding the full 8 foot (2,4 m) length of the
ground rod, bury it horizontally in a trench.
Space the ground rod or plates at least 6 feet
(1,8) from any other electrode or ground rod,
such as those used for signal circuits, radio
grounds, lightning rods, etc.
The earth surrounding the ground rod or plate
must contain enough moisture to make a
good electrical connection. In dry or sandy
areas, pour water around the rod, or consult
qualified personnel to devise a method of im
proving the connections.
The electrical power used to operate
this pump is high enough to cause inju
ry or death. Make certain that the control
box is properly grounded after installa
tion.
Refer to the literature accompanying the control
box for field wiring connections.
Pump Power Cable Connections
The electrical power used to operate
this pump is high enough to cause inju
ry or death. Obtain the services of a
qualified electrician to make all electri
cal connections. Make certain that in
coming power to the control box is in the
OFF position and locked out, or that the
power supply to the control box has
been otherwise cut off and locked out,
before connecting power or accessory
cables.
The pump is provided with a 50 ft. (15,2 m) power
cable (see Table B-4 for standard power cable
specifications). If a longer cable is required, an op
tional cable assembly must be ordered from the
factory. Splicing of the power cable is not recom
mended by the Gorman‐Rupp Company due to
safety and warranty considerations.
Never attempt to alter the length or re
pair any power cable with a splice. The
pump motor and cable must be com
pletely waterproof. Injury or death may
result from alternations.

OM-07325 S SERIES PUMPS
PAGE B - 8 INSTALLATION
Table B‐4. Pump Power Cable Specifications
Pump
Model
Voltage/
Phase
115/1
A.W.G
Cable
Size
Conductor
Dia.
Inches
(mm)
DC
Resistance
(ohms) at
25C (77F)
per 1000 ft.
(305 m)
Cable
O.D.
Inches
(mm)
Amp
Rating
(See
Note
Below)
Cable
Type
S2A 8
NOTE: * Amp Rating at 30C (86F)  Canada Use Type SOW Cable
** Amp Rating at 40C (104F)
Voltage
Drop
per 100 ft.
(30,5m) at
Max. Load
'GGC .71 3.990.97 (25) 0.17(4) 52**
When necessary to change or connect the pump
power cable to the control box, make certain the in
coming power is OFF and LOCKED OUT, Make
certain the control box is PROPERLY GROUNDED
and that the electrical data on the control matches
the motor name plate data.
Connect the pump power cable to the control box
as shown in the wiring diagrams in the control box
manual. Use conduit or cable clamps to secure the
power cable to the control box. Make certain that
all connections are tight and that cable entry points
are rainproof.
NOTE
The power cable furnished with the pump includes
three electrical conductors (white, red, and black),
two grounding conductors (green) and one ground
check conductor (yellow).The yellow ground
check lead is used in conjunction with customer‐
supplied ground monitoring equipment. If this
equipment is not used, the yellow lead should be
used as a ground conductor.
Control Box Specifications
Any control box used to operate the
pump must be approved by the Gor
man‐Rupp Company for the application.
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.
Using a volt‐ohm meter, connect one lead to the
motor cable green/yellow ground lead. Connect
the other 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.
Control Box Connections
This pump is shipped completely wired for the volt
age shown on the name plate, and is ready for op
eration through an approved control box.
Ground and wire the control box in accordance
with the instructions accompanying it.
NOTE
For reference, internal motor wiring connections
are shown in the Maintenance and Repair manual.
Liquid Level Devices
The standard pump is not furnished with a means
to automatically regulate liquid level. However, the
pump may be controlled to perform filling or dewa
tering functions by using either of the following op
tional sensing devices (see Figure B-4):

S SERIES PUMPS OM-07325
PAGE B - 9INSTALLATION
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.
Models under 6 horsepower require an additional
control box to incorporate liquid level controls. For
models over 6 horsepower, the circuitry may be
prewired as a factory option, or easily added to the
standard control box in the field by qualified per
sonnel. The unit is complete except for the remote
float switches. For installation and operation, see
the detailed instructions included with the optional
package.
Liquid level devices must be positioned far
enough apart to allow 10 minutes between
starts. If the pump motor cycles more than
6 starts per hour, it will over‐heat, resulting
in damage to the motor windings or control
box components.
Other types of liquid level devices may also be
used. Consult the factory for the liquid level device
best suited for your application.
If the pump requires liquid level devices,
install the liquid level devices and connect
them to the control box in accordance with
the instructions accompanying the de
vices.
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-07325 S SERIES PUMPS
PAGE B - 10 INSTALLATION
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 wir
ing connections.
WIRING DIAGRAMS
Refer to the appropriate wiring diagram in the liter
ature accompanying the control box when making
electrical connections.

OM-07325
S SERIES PUMPS
OPERATION PAGE C - 1
OPERATION - SECTION C
Review all SAFETY information in Section A.
Follow the instructions on all tags, labels and
decals attached to the pump.
This pump is designed to handle most
non‐volatile, non‐flammable liquids
containing specified entrained solids.
Do not attempt to pump volatile, corro
sive, or flammable liquids which may
damage the pump or endanger person
nel as a result of pump failure.
PRIMING
Install the pump and piping as described in IN
STALLATION. Make sure that the piping connec
tions are tight, and that the pump is securely
mounted. Check that the pump is properly lubri
cated (see LUBRICATION in MAINTENANCE
AND REPAIR).
This is not a self‐priming pump, so an external
priming device must be used if the pump is in
stalled on a suction lift. A foot valve may be in
stalled at the end of the suction pipe to maintain the
prime; however, this may adversely affect pump
performance due to friction loss. Many standard
centrifugal models are equipped with a hand‐oper
ated vacuum pump, exhaust primer, or ejector for
this purpose. If a priming device was not furnished
with the pump, it may be ordered from the factory
as an option.
Before attempting to operate the priming device,
close the discharge throttling valve. (Installation of
a spring‐loaded check valve is also recommended
to facilitate priming.) Once the pump is fully
primed, close the valve between the priming de
vice and pump to preserve the prime. Start the
pump and open the discharge valve slowly to fill
the discharge line.
Never operate this pump unless there is
liquid in the pump casing. The pump will
not prime when dry. Extended operation of
a dry pump will destroy the seal assembly.
Hand Primers
Hand‐operated primers are usually mounted on
the pump and, when operated, draw air out of the
suction line and pump casing. To prime a pump
with a hand vacuum pump, open the cock on the
pump priming line. Operate the hand pump until
liquid flows out of the check valve on the bottom of
the primer pump. Once the pump is primed, close
the valve located between the primer and the
pump so that the prime will not be lost.
DRAIN COCK
HANDLE
Figure 1. Hand Primer Assembly
STARTING
Consult the operations manual furnished with the
power source.

OM-07325 S SERIES PUMPS
OPERATIONPAGE C - 2
OPERATION
Leakage
No leakage should be visible at pump mating sur
faces, or at pump connections or fittings. Keep all
line connections and fittings tight to maintain maxi
mum pump efficiency.
Liquid Temperature And Overheating
The maximum liquid temperature for this pump is
160_F (71_C). Do not apply it at a higher operating
temperature.
Overheating can occur if operated with the valves
in the suction or discharge lines closed. Operating
against closed valves could bring the liquid to a
boil, build pressure, and cause the pump to rup
ture or explode. If overheating occurs, stop the
pump and allow it to cool before servicing it. Refill
the pump casing with cool liquid.
Allow an over‐heated pump to cool be
fore servicing. Do not remove plates,
covers, gauges, or fittings from an over‐
heated pump. Liquid within the pump
can reach boiling temperatures, and va
por pressure within the pump can cause
parts being disengaged to be ejected
with great force. After the pump cools,
drain the liquid from the pump by re
moving the casing drain plug. Use cau
tion when removing the plug to prevent
injury to personnel from hot liquid.
Strainer Check
If a suction strainer has been shipped with the
pump or installed by the user, check the strainer
regularly, and clean it as necessary. The strainer
should also be checked if pump flow rate begins to
drop. If a vacuum suction gauge has been in
stalled, monitor and record the readings regularly
to detect strainer blockage.
Never introduce air or steam pressure into the
pump casing or piping to remove a blockage. This
could result in personal injury or damage to the
equipment. If backflushing is absolutely neces
sary, liquid pressure must be limited to 50% of the
maximum permissible operating pressure shown
on the pump performance curve (see Section E,
Page 1).
Pump Vacuum Check
Since this pump does not have a suction check
valve, the discharge line must be fitted with a check
valve if a pump vacuum reading is to be taken.
With the pump inoperative, install a vacuum gauge
in the system, using pipe dope on the threads.
Block the suction line and start the pump. At oper
ating speed the pump should pull a vacuum of 20
inches or more of mercury. If it does not, check for
air leaks in the seal, gasket, or discharge valve.
Open the suction line, and read the vacuum gauge
with the pump primed and at operation speed.
Shut off the pump. The vacuum gauge reading will
immediately drop proportionate to static suction
lift, and should then stabilize. If the vacuum reading
falls off rapidly after stabilization, an air leak exists.
Before checking for the source of the leak, check
the point of installation of the vacuum gauge.
STOPPING
Never halt the flow of liquid suddenly. If the liquid
being pumped is stopped abruptly, damaging
shock waves can be transmitted to the pump and
piping system. Close all connecting valves slowly.
If the application involves a high discharge
head, gradually close the discharge
throttling valve before stopping the pump.
After stopping the pump, disconnect the power
source to ensure that the pump will remain inop
erative.
Cold Weather Preservation
In below freezing conditions, drain the pump to
prevent damage from freezing. Also, clean out any