GORMAN-RUPP PUMPS SF6G Application guide

OM-07423-01
June 14, 2021
GORMAN‐RUPP PUMPS
www.grpumps.com
e2021 Gorman‐Rupp Pumps Printed in U.S.A.
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
WITH PARTS LIST
SUBMERSIBLE PUMP
MODEL
SF6G

Register your new
Gorman‐Rupp pump online at
www.grpumps.com
Valid serial number and e‐mail address required.
RECORD YOUR PUMP MODEL AND SERIAL NUMBER
Please record your pump model and serial number in the
spaces provided below. Your Gorman‐Rupp distributor
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....................................
PREINSTALLATION INSPECTION PAGE B - 1............................................
PUMP SEALS PAGE B - 1.............................................................
LUBRICATION PAGE B - 1.............................................................
PUMP INSTALLATION PAGE B - 1......................................................
Pump Dimensions PAGE B - 1.....................................................
Pump Motor Specifications PAGE B - 1..............................................
Lifting PAGE B - 2.................................................................
Positioning the Pump PAGE B - 2...................................................
Piping PAGE B - 2................................................................
ELECTRICAL CONNECTIONS PAGE B - 3...............................................
Field Wiring Connections (Incoming Power) PAGE B - 3...............................
Dual Vlotage PAGE B - 3..........................................................
Motor Cable Grounding Test PAGE B - 3.............................................
Control Box Connections PAGE B - 4...............................................
Liquid Level Devices PAGE B - 5....................................................
OPERATION - SECTION C PAGE C - 1......................................
GENERAL INFORMATION PAGE C - 1..................................................
Pump Performance PAGE C - 1.....................................................
Control Box PAGE C - 4...........................................................
PUMP OPERATION PAGE C - 4........................................................
Liquid Temperature And Overheating PAGE C - 4.....................................
Impeller Rotation PAGE C - 5.......................................................
STARTING, STOPPING AND OPERATIONAL CHECKS PAGE C - 5.........................
Starting PAGE C - 5...............................................................
Stopping PAGE C - 6..............................................................
Operational Checks PAGE C - 6....................................................
COLD WEATHER PRESERVATION PAGE C - 7...........................................
LUBRICATION PAGE C - 7.............................................................
Draining Oil PAGE C - 7...........................................................
Condition of Oil Oil PAGE C - 7.....................................................
Adding Oil PAGE C - 7............................................................
TROUBLESHOOTING - SECTION D PAGE D - 1..............................
PREVENTIVE MAINTENANCE PAGE D - 3...............................................
PUMP MAINTENANCE AND REPAIR ‐ SECTION E PAGE E - 1.................
GENERAL INFORMATION PAGE E - 1..................................................
Lifting PAGE E - 1.................................................................

TABLE OF CONTENTS
(continued)
ii
PARTS LISTS:
Pump Model Assembly PAGE E - 3.................................................
Motor Assemblies PAGE E - 5......................................................
PUMP AND SEAL DISASSEMBLY AND REASSEMBLY PAGE E - 6.........................
PUMP END DISASSEMBLY PAGE E - 7.................................................
Preparing Pump for Disassembly PAGE E - 7........................................
Pump Casing Removal PAGE E - 7.................................................
Draining Oil From Seal Cavity PAGE E - 7............................................
Impeller Removal PAGE E - 8......................................................
Lower Seal Removal PAGE E - 8....................................................
Upper Seal Removal PAGE E - 8...................................................
PUMP END REASSEMBLY PAGE E - 9..................................................
Cleaning and Inspection of Pump Parts PAGE E - 9...................................
Upper Seal Installation PAGE E - 10..................................................
Lower Seal Installation PAGE E - 11..................................................
Impeller Installation PAGE E - 12.....................................................
Suction Head and Wear Ring Installation PAGE E - 12..................................
Pump Casing Installation PAGE E - 12................................................
Impeller Face Clearance Adjustment PAGE E - 12.....................................
Final Assembly PAGE E - 13........................................................
MOTOR DISASSEMBLY PAGE E - 13....................................................
Hoisting Bail Removal PAGE E - 13..................................................
Terminal Housing Assembly Removal PAGE E - 13.....................................
Rotor Shaft and Bearing Removal PAGE E - 14........................................
Stator Removal PAGE E - 14........................................................
MOTOR REASSEMBLY PAGE E - 15.....................................................
Stator Installation PAGE E - 15......................................................
Bearing and Rotor Shaft Installation PAGE E - 16......................................
Terminal Housing Assembly Installation PAGE E - 17...................................
Hoisting Bail Installation PAGE E - 18.................................................
VACUUM TESTING PAGE E - 18........................................................
Seal Cavity Testing PAGE E - 18.....................................................
Seal and Motor Cavity Testing PAGE E - 19...........................................
LUBRICATION PAGE E - 20.............................................................
Seal Cavity PAGE E - 20............................................................
Motor Bearings PAGE E - 20........................................................

SF SERIES OM-07423
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.
Because pump installations are seldom identical,
this manual cannot possibly provide detailed in
structions and precautions for every aspect of
each specific application. Therefore, it is the re
sponsibility of the owner/installer of the pump to
ensure that applications not addressed in this
manual are performed only after establishing that
neither operator safety nor pump integrity are com
promised by the installation. Pumps and related
equipment must be installed and operated ac
cording to all national, local and industry stan
dards.
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
power source, contact the power source manufac
turer's local dealer or representative.
HAZARD AND INSTRUCTION
DEFINITIONS
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-07423SF SERIES
PAGE A - 1SAFETY
SAFETY - SECTION A
This information applies to the SF Se
ries submersible pump indicated on the
front cover of this manual.
In addition to this manual, see the sepa
rate literature covering the control box,
control accessories or other equipment
shipped with this pump.
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 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.
The following precautions should be
taken before attempting to open or ser
vice the pump; otherwise, injury or
death could result.
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).
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

SF SERIESOM-07423
PAGE A-2 SAFETY
in this warning could result in injury or
death to personnel.
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.
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
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.

OM-07423SF SERIES
PAGE A - 3SAFETY
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 dispersing heat through the
motor housing cooling fins into the liq
uid being pumped, normal operating
temperatures can still be high enough
to cause burns. The temperature 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
low the pump to completely cool before
servicing.
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.
Pumps and related equipment must be
installed and operated according to all na
tional, local and industry standards.

SF SERIES OM-07423
PAGE B - 1
INSTALLATION
INSTALLATION - SECTION B
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.
The motor in these pumps is not designed
to be operated in air for more than 10 min
utes without overheating. The pumps must
be operated through liquid level controls to
maintain the level of liquid in the wet well so
that power to the motor is cut off when liq
uid falls below the midpoint of the motor
housing.
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 assembly for cracks, dents,
damaged threads, and other obvious dam
age.
b. Check for and tighten loose attaching hard
ware.
c. Inspect the power cable for cuts or any other
obvious damage.
d. Check that amperes, phase, voltage, and
hertz indicated on the motor name plate
match the ratings on the control box and in
coming power.
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.
PUMP SEALS
This pump is equipped with two mechanical seals.
The lower seal is lubricated by the liquid being
pumped and prevents the liquid from entering the
seal housing cavity from the pump end. The upper
seal prevents oil from escaping from the seal hous
ing into the motor housing and acts as backup pro
tection in the event of lower seal failure.
LUBRICATION
The seal cavity is fully lubricated when shipped
from the factory. However, the lubrication level
must be checked before installing the pump (see
LUBRICATION in MAINTENANCE AND REPAIR
- SECTION E). If the oil level is abnormally low, de
termine the cause before putting the pump into
service.
The shaft bearings are permanently lubricated.
There is no other lubrication in the pump.
PUMP INSTALLATION
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.
Pump Motor Specifications
The motor furnished with this pump is a 60 Hz.,
Squirrel Cage, Induction Start, Class H Insulation
Rated 365_F (180_C).

OM-07423 SF SERIES
PAGE B - 2 INSTALLATION
See Table B-1 for motor specifications.
TABLE B-1. PUMP MOTOR SPECIFICATIONS
MODEL VOLTAGE/
PHASE
SIZE MOTOR
RPM
MAX
LOAD
AMPS
H.P. LOCKED
ROTOR
AMPS
SF6G 460/575 6” 75.0 1750 86/69 542/434
Lifting
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.
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 may be mounted on guide rails or
cables for use with optional discharge elbow/base
plate kits, or it may be mounted on a trash stand
with an optional discharge elbow.
If the pump is configured for a guide rail/guide
cable application, the pump will be equipped with
a rail guide shoe which connects to the discharge
optional elbow/baseplate. When lowered into
place, the pump is automatically and securely con
nected to the elbow/baseplate and the piping sys
tem. For information on installing the guide rails,
see the literature accompanying them.
NOTE
When engaging the guide shoe and elbow/base
plate, make sure that the connection is not impeded
by mounting hardware, and that the guide shoe is
fully seated in the baseplate.
To install a pump configured for a guide rail/guide
cable application, engage the guide shoe at the
top of the guide rails and use a suitable lifting de
vice attached to the lifting handle to lower the
pump into the wet well. When the pump and guide
shoe engages the discharge elbow/baseplate, it
will form an automatic seal.
If the pump is mounted on a trash stand, secure a
discharge hose or pipe to the optional discharge
elbow and use a suitable lifting device attached to
the lifting handle to lower the pump into the wet
well.
Make certain that the pump and stand sit level in
the wet well.