GORMAN-RUPP SM SERIES Installation and operating instructions

OM-06520-02
November 11, 2013
ACU
THE GORMAN‐RUPP COMPANY DMANSFIELD, OHIO
www.grpumps.com
GORMAN‐RUPP OF CANADA LIMITED DST. THOMAS, ONTARIO, CANADA Printed in U.S.A.
e2013 The Gorman‐Rupp Company
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
WITH PARTS LIST
SM SERIES PUMPS
MODELS
SM3C65-X6
ALL VOLTAGES

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Gorman‐Rupp pump online at
www.grpumps.com
Valid serial number and e‐mail address required.
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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....................................
RETAINING “PERMISSIBILITY” PAGE B - 1..............................................
GORMAN‐RUPP MSHA PUMP INSPECTION FORM PAGE B - 2............................
Pump Model Designation PAGE B - 3...............................................
PREINSTALLATION INSPECTION PAGE B - 3............................................
Lubrication PAGE B - 3............................................................
PUMP INSTALLATION PAGE B - 4......................................................
Pump Specifications PAGE B - 4....................................................
Pump Dimensions PAGE B - 4.....................................................
Lifting PAGE B - 5.................................................................
Positioning the Pump PAGE B - 5...................................................
PIPING PAGE B - 6...................................................................
CONTROL BOX PAGE B - 6...........................................................
Enclosure PAGE B - 6.............................................................
Grounding Methods PAGE B - 10....................................................
Field Wiring Connections (Incoming Power) PAGE B - 11...............................
Pump Power Cable Connections PAGE B - 12.........................................
LIQUID LEVEL CONTROL PAGE B - 13..................................................
OPERATION - SECTION C PAGE C - 1......................................
CONTROL BOX FUNCTION PAGE C - 1.................................................
Component Function PAGE C - 1...................................................
PUMP OPERATION PAGE C - 1........................................................
Liquid Temperature And Overheating PAGE C - 2.....................................
Checking Pump Rotation PAGE C - 2...............................................
STARTING PAGE C - 3................................................................
STOPPING PAGE C - 3................................................................
OPERATIONAL CHECKS PAGE C - 4...................................................
COLD WEATHER PRESERVATION PAGE C - 4...........................................
LUBRICATION PAGE C - 4.............................................................
Draining Oil PAGE C - 4...........................................................
Condition of Oil PAGE C - 4........................................................
Adding Oil PAGE C - 4............................................................
TROUBLESHOOTING - SECTION D PAGE D - 1..............................
ELECTRICAL TESTING PAGE D - 2.....................................................
Test Equipment PAGE D - 3........................................................
Voltage Imbalance PAGE D - 3.....................................................
Motor And Motor Power Cable Continuity PAGE D - 3.................................
Insulation Resistance PAGE D - 4...................................................
PUMP MAINTENANCE AND REPAIR - SECTION E PAGE E - 1................
STANDARD PERFORMANCE CURVE PAGE E - 1........................................
PARTS LISTS
Pump Model PAGE E - 3..........................................................
Submersible Motor Assemblies PAGE E - 5..........................................
PUMP END DISASSEMBLY PAGE E - 6.................................................

TABLE OF CONTENTS
(continued)
ii
Strainer and Suction Head Removal PAGE E - 7......................................
Draining Oil From Seal Cavity PAGE E - 7............................................
Positioning Pump For Disassembly PAGE E - 7.......................................
Impeller Removal PAGE E - 7......................................................
Lower Seal Removal PAGE E - 7....................................................
Upper Seal Removal PAGE E - 8...................................................
PUMP END REASSEMBLY PAGE E - 8..................................................
Cleaning And Inspection Of Pump Parts PAGE E - 8..................................
Upper Seal Installation PAGE E - 9..................................................
Seal Plate Installation PAGE E - 10...................................................
Lower Seal Installation PAGE E - 11..................................................
Impeller Installation PAGE E - 12.....................................................
Strainer Installation PAGE E - 12.....................................................
MOTOR DISASSEMBLY PAGE E - 12....................................................
Terminal Housing And Power Cable Removal And Disassembly PAGE E - 13..............
Shaft and Rotor Removal PAGE E - 13...............................................
Stator Removal PAGE E - 14........................................................
MOTOR REASSEMBLY PAGE E - 14.....................................................
Stator Installation PAGE E - 15......................................................
Shaft And Rotor Installation PAGE E - 15.............................................
Terminal Housing And Power Cable Reassembly And Installation PAGE E - 16............
FINAL ASSEMBLY PAGE E - 18.........................................................
LUBRICATION PAGE E - 18.............................................................
Seal Cavity PAGE E - 18............................................................
Pump Oil Specifications PAGE E - 19.................................................
Motor Bearings PAGE E - 19........................................................

SM SERIES OM-06520
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 pump is an S Series model. The basic material
of construction is CD4MCu stainless steel, with 316
stainless steel rotor shaft, motor housing and hard
ware. The pump is designed to handle industrial
chemical and low pH resistance materials. The in
tegral electric motor must be operated through the
control box furnished with the pump as standard
equipment. The pump and control comply with
MSHA schedule 2G regulations, and have been
approved for use in hazardous locations by the
Pennsylvania Department of Environmental Re
sources (D.O.E.R.).
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]
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.

SM SERIES OM-06520
PAGE A - 1SAFETY
SAFETY - SECTION A
This information applies to SM Series
submersible motor driven pumps.
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.
4. Close the discharge valve (if
used).
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 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. Make certain that the
pump and enclosure are properly
grounded. Be sure that the incoming
power matches the voltage and phase
of the pump and control before connect
ing the power source. Do not run the
pump if the voltage is not within the lim
its.
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 po
sition and locked out, or that the power
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.
All electrical connections must be in ac
cordance with MSHA Schedule 2G. If
there is a conflict between the instruc
tions provided and MSHA specifica
tions, MSHA specifications shall take
precedence. All electrical equipment
supplied with this pump was in confor
mance with MSHA requirements in ef
fect on the date of manufacture. Failure
to follow applicable specifications, or
substitution of electrical parts not
supplied or approved by the manufac
turer, can result in severe injury or
death.
This pump is not designed to pump vol

SM SERIESOM-06520
PAGE A - 2 SAFETY
atile, explosive, or flammable materials.
Refer to the chart in Installation, Section
B for the basic materials of construction
for each pump covered in this manual.
Do not attempt to pump any liquids for
which your 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
application data.
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.
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 open the control box in an explo
sive atmosphere. When sealed, the con
trol box is explosion proof to prevent the
ignition of combustible gases. Opening
the box in an explosive atmosphere
could result in fire or explosion.

OM-06520SM 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 the pump and
control box. If there are any questions concerning
your specific application, contact your Gor
man‐Rupp distributor or the Gorman‐Rupp Com
pany
All functions performed by the customer on the
pump or control must be done in accordance with
MSHA schedule 2G regulations to ensure the ex
plosion‐proof integrity. No alterations of original
design may be made without the consent of the
Gorman‐Rupp Company and MSHA.
To retain “Permissibility” of this equipment,
the following conditions shall be satisfied:
1. GENERAL SAFETY. FREQUENT INSPECTION
SHALL BE MADE. ALL ELECTRICAL PARTS,
INCLUDING THE PORTABLE CABLE AND WIR
ING, SHALL BE KEPT IN A SAFE CONDITION.
THERE SHALL BE NO OPENINGS INTO THE
CASINGS OF THE ELECTRICAL PARTS. A
PERMISSIBLE DISTRIBUTION BOX SHALL BE
USED FOR CONNECTION TO THE POWER
CIRCUIT UNLESS CONNECTION IS MADE IN
FRESH INTAKE AIR. THE MACHINE FRAME
SHALL BE EFFECTIVELY GROUNDED. THE
POWER WIRES SHALL NOT BE USED FOR
GROUNDING. THE OPERATING VOLTAGE
MUST MATCH THE VOLTAGE RATING OF THE
MOTOR(S) 10%.
2. SERVICING. EXPLOSION PROOF ENCLO
SURES SHALL BE RESTORED TO THE STATE
OF ORIGINAL SAFETY WITH RESPECT TO ALL
FLAME ARRESTING PATHS, LEAD EN
TRANCES, ETC., FOLLOWING DISASSEMBLY
FOR REPAIR OR REBUILDING, WHETHER BY
THE OWNER OR AN INDEPENDENT SHOP.
3. FASTENING. ALL BOLTS, NUTS, SCREWS,
AND OTHER MEANS OF FASTENING, AND
ALSO THREADED COVERS, SHALL BE IN
PLACE, PROPERLY TIGHTENED AND SE
CURED.
4. RENEWALS AND REPAIRS. INSPECTIONS,
REPAIRS, OR RENEWALS OF ELECTRICAL
PARTS SHALL NOT BE MADE UNLESS THE
PORTABLE CABLE IS DISCONNECTED FROM
THE CIRCUIT FURNISHING POWER, AND THE
CABLE SHALL NOT BE CONNECTED AGAIN
UNTIL ALL PARTS ARE PROPERLY REASSEM
BLED. SPECIAL CARE SHALL BE TAKEN IN
MAKING RENEWALS OR REPAIRS. LEAVE NO
PARTS OFF. USE REPLACEMENT PARTS EX
ACTLY LIKE THOSE FURNISHED BY THE
MANUFACTURER. WHEN ANY LEAD EN
TRANCE IS DISTURBED, THE ORIGINAL
LEADS OR EXACT DUPLICATES THEREOF
SHALL BE USED AND STUFFING BOXES
SHALL BE REPACKED IN THE APPROVED
MANNER.
5. CABLE REQUIREMENTS. A FLAME RESIS
TANT PORTABLE CABLE BEARING A MSHA 
ASSIGNED IDENTIFICATION NUMBER, ADE
QUATELY PROTECTED BY AN AUTOMATIC
CIRCUIT INTERRUPTING DEVICE, SHALL BE
USED. SPECIAL CARE SHALL BE TAKEN IN
HANDLING THE CABLE TO GUARD AGAINST
MECHANICAL INJURY AND WEAR. SPLICES
IN PORTABLE CABLES SHALL BE MADE IN A
WORKMANLIKE MANNER, MECHANICALLY
STRONG, AND WELL INSULATED. ONE TEM
PORARY SPLICE MAY BE MADE IN ANY TRAIL
ING CABLE. SUCH TRAILING CABLE MAY
ONLY BE USED FOR THE NEXT 24 HOUR PE
RIOD. NO TEMPORARY SPLICE SHALL BE
MADE IN A TRAILING CABLE WITHIN 25 FEET
OF THE MACHINE, EXCEPT CABLE REEL
EQUIPMENT. CONNECTIONS AND WIRING
TO THE OUTBY END OF THE CABLE SHALL
BE IN ACCORDANCE WITH RECOGNIZED
STANDARDS OF SAFETY.

OM-06520 SM SERIES
PAGE B - 2 INSTALLATION
GORMAN-RUPP MSHA PUMP INSPECTION FORM
INSPECTOR____________________________ DATE____________
MODEL NO.____________________________ SERIAL NO.____________
UNIT ELECTRICAL RATING:
H.P.________, VOLTS________, PUMP AMPS________, HERTZ________
STARTER X/P NO: XP3026-1 (CONTROL WITHOUT FLOAT)
OR
18-XPA040007-0 (CONTROL WITH FLOAT)
MOTOR CABLE:
___No. 12; 7 Conductor; Type SPC; .89 + .03 O.D.; Heavy Jacketed; Royal – MSHA 122;
___No. 8; 9 Conductor; Type SPC; 1.05 + .03 O.D.; Heavy Jacketed; Royal – MSHA 122;
___No. 6; 9 Conductor; Type SPC; 1.25 + .04 O.D.; Heavy Jacketed, Royal – MSHA 122;
Length______________________
ITEM AREA OF INSPECTION ACC. REJ. CORRECTED
1. Are lock washers (or equivalent) provided for all ex
plosion proof enclosure fastenings?
2. Are all plane joints securely fastened so that a
.005-inch feeler gauge cannot be inserted?
3. Is motor plug secured with lock clip?
4. Are all electrical connections secure?
5. Are all electrical connections insulated where neces
sary and per appropriate drawing?
6. Are packing glands properly packed so that
1/8-inch clearance remains between packaging nut
and stuffing box?
7. Are packing nut and cable grip secured with lock
wire and lead seal?
8. Was pump leak tested?
9. Was pump and control electrically tested?
10. Was pump water tested?
11. Are pump, cable, and control assembled together
properly per appropriate drawing?
Comments:
NOTE: Fill out form completely and “rejections” must be corrected and re-inspected. Inspec
tor must initial and date when corrective action was taken. 10/9/87
Form CD GL-02128 Rev 6/05
Doc# 152708
This form not to be revised
without approval of MSHA.

OM-06520SM SERIES
PAGE B - 3INSTALLATION
Pump Model Designation
Following is a description of the model numbering
system for SM 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.
SM
Series
Discharge
Size
Pump
Hydraulics
Pump
Construction
H.P.
(If Shown)
Voltage/Phase
3 C 1 460/3- X6
Pump Model
Review all SAFETY information in Section A.
This section is intended only to summarize recom
mended installation practices for the pump and
control box. If there are any questions concerning
your specific application, contact your Gor
man‐Rupp distributor or the Gorman‐Rupp Com
pany.
PREINSTALLATION INSPECTION
The pump and control box were inspected and
tested before shipment from the factory. Before in
stallation, inspect the pump for damage which may
have occurred during shipment. Check as follows:
a. Inspect the pump assembly for cracks, dents,
damaged threads, and other obvious dam
age.
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 furnished with 50 feet
(15,2 m) of power cable. Inspect the cable for
cuts or damage.
d. Inspect the control box for cracks, dents, and
other obvious damage.
e. Check that all control box components are se
curely attached to their mounting surfaces,
and that the electrical connections are tight
and free of corrosion.
f. Compare the amperes, phase, voltage and
hertz indicated on the motor nameplate to the
ratings indicated for the control box.
g. Carefully read all tags, decals, and markings
on the pump assembly and the control box,
and perform all duties as indicated.
h. Check the pump and motor for any oil leaks.
An oil leak may indicate a cut O ring or other
damage.
i. If the pump and control box have been stored
for more than 12 months, some of the compo
nents or lubricants may have exceeded their
maximum shelf life. These must be inspected
or replaced to ensure maximum pump serv
ice.
If the maximum shelf life has been exceeded, or if
anything appears to be abnormal, contact your
Gorman‐Rupp distributor or the factory to deter
mine the repair or updating policy. Do not put the
pump into service until appropriate action has
been taken.
Lubrication
This pump series utilizes one lubrication cavity, lo
cated just behind the seal plate. It is filled with pre
mium quality submersible pump oil which lubri
cates two shaft seals. The motor operates in air
and requires no lubrication.
The lower shaft seal prevents liquid from entering
the lubrication cavity, while the upper shaft seal
prevents oil leakage into the motor. The upper seal
also acts as backup protection in the event of lower
seal failure.
The lubrication cavity was fully lubricated when
shipped from the factory. Check the oil level before
installing the pump (see LUBRICATION in MAIN
TENANCE AND REPAIR). An additional quart of
oil has been provided with the pump to “top off” the
oil cavity. If the oil level is abnormally low, deter
mine the cause before putting the pump into serv
ice.

OM-06520 SM SERIES
PAGE B - 4 INSTALLATION
PUMP INSTALLATION
Pump Specifications
See Tables B-1 and B-2 for pump specifications.
Table B-1. Pump Specifications
Model
Voltage/
Phase
Motor
Horse
power
Pump
Speed
(RPM)
Full
Load
Amperes
No
Load
Amperes
Locked
Rotor
Amperes
Discharge
Size
(NPT)
SM3C 460/3
575/3
60 3450 10.8
8.6
4.0
3.2
56
45
3 INCH
Table B-2. Additional Specifications
Pump
Model
Voltage/
Phase
Approximate Weight
Lbs. (kg) Seal Cavity
Pump 50Ft. Cable
Oil Capacity
Ounces
(Liters)
Filling Position
(H)orizontal
(V)ertical
SM3C 460/3
575/3
105 (47,6) 23 (10,4) 16 (0,47) H
Pump Dimensions
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 MSHA safety
requirements. Failure to observe these
requirements 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 Section E, MAIN
TENANCE AND REPAIR when determining the
most efficient piping installation.

OM-06520SM SERIES
PAGE B - 5INSTALLATION
Table B-3. MSHA Specifications And Approval Data
Model No. MSHA No Cable P/N Trailing Cable Motor Cable
SM3C65‐X6 460/3
SM3C65‐X6 575/3
XP-3185-1
XP-3185-1
47351-011
47351-011
No. 8, 3 Conductor,
Type G‐GC, 0.97” $
.03” O.D., Protected By
An Instantaneous Trip
Circuit Breaker, Set At
200 Amps Max. MSHA
Flame Resistance,
600/2000 Volt, 90_C.
Max. Length: 500 Ft. ‐
Customer Furnished
Note: Instantaneous
Trip Amps Set At 200
Amps Max.
G‐R P/N 47351-011.
#12 AWG., 7 Conductor
Type SPC, 0.89” "
0.03” O.D., Yellow Jack
et. 90_C 600/2000 Volt
Royal ‐ MSHA Flame
Resistant, Max. Cable
Length: - Combined
Trailing Cable And
Pump Motor Cable Not
To Exceed 500 Ft.
Lifting
Pump unit weights can vary depending on the ma
terial of construction and length of cable on the
unit. Check the shipping tag on the unit packaging
for the actual weight, and use lifting equipment
with appropriate capacity. Remove all customer‐
installed equipment such as suction and dis
charge hoses or piping before attempting to lift ex
isting, 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.
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 operate fully or partially
submerged. It may also be operated in air for ex
tended periods. The rotating parts are oil lubri
cated, and the motor is cooled by a constant flow of
liquid or air discharged through internal passages.
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-06520 SM SERIES
PAGE B - 6 INSTALLATION
BY BAIL IN PERFORATED CULVERT PIPE ON SUPPORTS
Figure B-1. Typical Pump Installations
All liquid entering the pump must pass through a
strainer screen. Any spherical solids which pass
through the screen will pass through the pump.
PIPING
No suction piping is required in a standard sub
merged application.
SM Series pumps are provided with a suction
strainer to prevent large solids from clogging the
impeller. On high discharge head applications, the
strainer can be removed, and the pump suction
“staged” to the discharge of another pump, allow
ing one pump to feed the other.
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.
For maximum pumping capacity, keep the dis
charge as short and straight as possible. Minimize
the use of elbows and fittings which increase fric
tion losses through the discharge piping system.
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.
CONTROL BOX
This pump is driven by an integral 60 hertz, 6 HP
motor. It is designed to operate through the control
box furnished with the pump.
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.
Enclosure
The control box is a NEMA type 10, MSHA certified
enclosure. The enclosure is not designed to be

OM-06520SM SERIES
PAGE B - 7INSTALLATION
watertight, and should not be submerged. See
Figure B-2 for enclosure dimensions and callouts.
Secure the control box 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
tions). 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.
Table B-4. Control Box Specifications
Model Voltage/ Control Box
Part No.
Mtg. Plate
Part No.
Relay
Rating
(Amps)
Hold
Amps
Trip
Amps
MSHA
Cert. No.
Phase
SM3C 460/3 13.0 14.3 17.6 XP-3185-1
SM3C 575/3 10.4 14.3
47631-148
47631-149
47882-005
47882-006 XP-3185-111.4

ITEM
NO.
PART NAME PART
NUMBER
MAT'L
CODE
QTY ITEM
NO.
PART NAME PART
NUMBER
MAT'L
CODE
QTY
OM-06520 SM SERIES
PAGE B - 8 INSTALLATION
Figure B-2. Control Box Assembly
PARTS LIST - EXTERNAL PARTS
47631-148 (460V) AND 47631-149 (575V) CONTROL BOXES
(See Figure 3 For Internal Control Box Parts)
1 HEX HD CAPSCREW 21632-597 ----- 14
2 LOCKWASHER J06 15991 14
3 FLAT WASHER KE06 15991 14
4 PACKING GLAND NUT 31874-017 13045 2
5LEAD SEAL 21188-002 ----- 2
6WIRE - 14 INCH 31311-004 17990 2
7ROPE PACKING 31313-010 22120 1
8PACKING WASHER 31133-109 13150 4
9 GROUND LUG 27222-004 ----- 2
10 HEX HD CAPSCREW B0402 15991 4
11 LOCKWASHER J04 15991 4
12 ENCLOSURE 38383-001 13045 1
13 FL HD MACH SCREW Y0602 15991 4
14 MOUNTING BRACKET 33657-002 13090 2
15 ENCL COVER ASSY 42114-074 ----- 1
-ENCLOSURE COVER 38383-401 13015 1
-ON/OFF HANDLE 38421-012 13040 1
-HANDLE SETSCREW GA0501 1/2 15990 1
-SHAFT ASSY 41881-276 24150 1
-SHAFT BUSHING 31513-031 13155 1
-BUSHING SETSCREW GA#10-01S 15990 1
-WIRING DECAL 2613GM ----- 1
16 MTG PLT ASSY (460V) 47882-005 ----- 1
MTG PLT ASSY (575V) 47882-006 ----- 1
17 MSHA CERT PLATE 2613GL 17020 1
18 DRIVE SCREW BM#04-03 17000 4
19 HEX HD CAPSCREW B0608 15991 4
20 LOCKWASHER J06 15991 4
21 HEX NUT D06 15991 4
22 CABLE CLAMP 38116-603 13040 4
23 RUB BRKT PROTECTOR 33573-001 19990 4
24 CHAIN - 3/16 X 12 41158-009 15991 2
25 HEX HD CAPSCREW B0604 15991 2
26 LOCKWASHER J06 15991 2
27 ASSEMBLY PLATE 2613GG 17020 1
28 DRIVE SCREW BM#04-03 17000 2
29 MSHA APPROVAL PLATE 2613ES 17020 1
30 DRIVE SCREW BM#04-03 17000 2
31 PENN DOER APPL PLATE 2613FL 17020 1
32 DRIVE SCREW BM#04-03 17000 4
INDICATES PARTS RECOMMENDED FOR STOCK

OM-06520SM SERIES
PAGE B - 9INSTALLATION
Figure B-3. Electrical Mounting Plate Assembly
PARTS LIST
47882-005 (460V) AND 47882-006 (575V) MOUNTING PLATE ASSEMBLIES
(See Figure 2 For External Control Box Parts)
ITEM
NO. PART NAME PART NUMBER
MAT'L
CODE QTY
1 SWITCH BRACKET 34512-027 ----- 1
2CUTLER HAMMER SWITCH 27341-211 ----- 1
3 TERMINAL S1790 ----- 2
4 WIRE 14 GA. X 36.5 IN. LG. 38746-027 ----- 1
5 TERMINAL BLOCK END 27233-021 ----- 1
6 TERMINAL BLOCK NOT REQUIRED -----
7 TERMINAL BLOCK 27233-203 ----- 5
8 MOUNTING PLATE 33287-011 ----- 1
9 G E CAPACITOR 27571-332 ----- 1
10 RELAY/SHUNT TRIP (460V) 27541-483 ----- 1
RELAY/SHUNT TRIP (575V) 27541-495 ----- 1
11 CAPACITOR BRACKET 27581-904 ----- 1
12 RD PHILLIP MACH SCREW 21771-551 ----- 2
13 RD PHILLIP MACH SCREW 21771-552 ----- 4
14 RD PHILLIP MACH SCREW 21771-553 ----- 2
15 RD PHILLIP MACH SCREW 21771-542 ----- 1
INDICATES PARTS RECOMMENDED FOR STOCK

OM-06520 SM SERIES
PAGE B - 10 INSTALLATION
Figure B-4. Mounting Plate Wiring Schematic
Grounding Methods
Electrically ground the installation before before
connecting 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-5 for some suggested
grounding methods.
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-5. 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.

OM-06520SM SERIES
PAGE B - 11INSTALLATION
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 m) from any other electrode or ground
rod, such as those used for signal circuits, ra
dio 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 ar
eas, pour water around the rod, or consult
qualified personnel to devise a method of im
proving the connection.
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.
Field Wiring Connections (Incoming Power)
The trailing cable from the power source to the
control box must be furnished by the customer.
The cable must be flame resistant, protected by
an instantaneous circuit breaker, and meet the
specifications indicated in Table B-2 in this sec
tion.
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. 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 open the control box in an explo
sive atmosphere. When sealed, the con
trol box is explosion proof to prevent the
ignition of combustible gases. Opening
the box in an explosive atmosphere
could result in fire or explosion.
The pump control is designed to regulate a 460 or
575 volt, 3 phase, 60 hertz power supply (see Table
4 for control box specifications). The field wiring
must be properly sized to ensure an adequate volt
age supply. The voltage available at the motor
must be within the range indicated in Table B-5.
To calculate the voltage available at the motor, pro
ceed as follows:
a. Measure the incoming voltage across lines 1
& 2, 2 & 3, and 1 & 3 while the pump is oper
ating at full capacity. See the wiring dia
grams in this section for power supply con
nections.
b. Next, subtract the motor cable voltage drop
(see Table 6, 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
other details to insure an adequate voltage
supply to the pump.
Table B-5. Pump Motor Voltage Limits
Nominal
Voltage Phase
Minimum
Voltage
Maximum
Voltage
460 3 420 500
575 3 520 630
Use the packing gland nuts to secure and seal the
incoming field wiring to the control box. make cer
tain 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.
NOTE
After the power cables have been connected to the

OM-06520 SM SERIES
PAGE B - 12 INSTALLATION
control box, the packing gland nuts must be wired
and sealed before operation. See Terminal Hous
ing And Power Cable Reassembly in Section E for
instructions.
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 qu
alified electrician to make all electrical
connections. Make certain that incom
ing power to the control box is in the off
position and locked out, or that the pow
er supply to the control box has been
otherwise cut off and locked out, before
connecting power or accessory cables.
The standard pump is provided with a 50 foot (15,2
meters) power cable (see table 6 for 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 alterations.
Table B-6. Pump Power Cable Specifications Model SM3C65
Pump
Model
Voltage/
Phase
AWG
Cable
Size
Cable
O.D.
Inches
(mm)
Conductor
Dia.
Inches
(mm)
Amp
Rating
(See Note
below)
Cable
Type
DC
Resistance
(ohms) at
25_C
(77_F) per
1000 ft.
(305 m)
Voltage
Drop per
100 ft.
(30,5m) at
Max. Load
SM3C 460/3
575/3
12 0.89
(22,6)
.10
(2,5)
30 SPC 1.72 3.72
2.96
NOTE: *Amp Rating at 30_C (86_F). Applies only to type SPC cable. Refer to manufacturer's
specifications for other cable.
**Amp Rating at 40_C (104_F). Applies only to type SPC cable. Refer to manufacturer's
specifications for other cable.
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 Figure B-6. Use conduit or cable
clamps to secure the power and accessory cables
to the control box. Make certain that all connec
tions are tight and that cable entry points are
rainproof.

OM-06520SM SERIES
PAGE B - 13INSTALLATION
Figure B-6. Pump Power Cable Connection Diagram (All Models)
PUMP POWER CABLE CONNECTION INSTRUCTIONS
1. Run the pump cable through the packing
gland nuts and washers (the concave side of
the washer should toward the packing) at the
bottom of the control.
2. Connect the white, black, and red power
leads to terminals “T1”, “T2”, and “T3”, re
spectively.
3. Connect the green ground lead to terminal
“GRD”.
4. Connect the yellow ground check lead to ter
minal “GC”.
5. Connect the blue control lead to terminal
“P1”.
6. Connect the orange control lead to terminal
“P2”.
7. Install the packing in the gland with the wash
ers on each side, and tighten the packing
gland nut. With the nuts tight and the packing
fully compressed, there must be a minimum
space of 1/8 inch between the bottom of the
nut and the enclosure.
8. Use the seal wire (P/N 31311-004) and lead
seal (P/N 21188-002) to secure the packing
gland nut to the enclosure. Use the hole in the
hex nut and the hole at the top left of the enclo
sure to prevent loosening of the nut.
LIQUID LEVEL CONTROL
The standard pump is not furnished with a means
to automatically regulate liquid level. However, the
pump may be controlled to perform dewatering
functions by using an optional control box avail
able from the factory. The control utilizes a
bulb‐type sensing device, where a bulb raises or
lowers (floats) with the liquid level, thus activating
an enclosed miniature switch.
Refer to Figure B-7 for a typical bulb‐type float in
stallation.
The float must be positioned 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 mo
tor windings or control box components.