Gorman-Rupp Pumps 11-1-2A52-E2 User Manual

ACDE OM‐04829‐02

November 27, 2001

Rev. B 10‐30‐2013

INSTALLATION, OPERATION,

AND MAINTENANCE MANUAL

WITH PARTS LIST

10 SERIES PUMPS

MODELS

11 1/2A52-E2 1P
11 1/2A52-E2 3P

THE GORMAN‐RUPP COMPANY  MANSFIELD, OHIO

www.grpumps.com

GORMAN‐RUPP OF CANADA LIMITED  ST. THOMAS, ONTARIO, CANADA Printed in U.S.A.

2001 The Gorman‐Rupp Company

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

INTRODUCTION PAGE I - 1.................................................

SAFETY ‐ SECTION A PAGE A - 1............................................

INSTALLATION - SECTION B PAGE B - 1....................................

Pump Dimensions PAGE B - 1.....................................................

PREINSTALLATION INSPECTION PAGE B - 2............................................

POSITIONING PUMP PAGE B - 2.......................................................

Lifting PAGE B - 2.................................................................

Mounting PAGE B - 2.............................................................

Clearance PAGE B - 2.............................................................

SUCTION AND DISCHARGE PIPING PAGE B - 3.........................................

Materials PAGE B - 3..............................................................

Line Configuration PAGE B - 3......................................................

Connections to Pump PAGE B - 3..................................................

Gauges PAGE B - 3...............................................................

SUCTION LINES PAGE B - 3...........................................................

Fittings PAGE B - 3...............................................................

Strainers PAGE B - 3..............................................................

Sealing PAGE B - 3...............................................................

Suction Lines In Sumps PAGE B - 4.................................................

Suction Line Positioning PAGE B - 4................................................

DISCHARGE LINES PAGE B - 5........................................................

Siphoning PAGE B - 5.............................................................

Valves PAGE B - 5................................................................

Bypass Lines PAGE B - 5..........................................................

AUTOMATIC AIR RELEASE VALVE PAGE B - 6...........................................

Air Release Valve Installation PAGE B - 6............................................

ELECTRICAL CONNECTIONS PAGE B - 7...............................................

OPERATION - SECTION C PAGE C - 1......................................

PRIMING PAGE C - 1.................................................................

STARTING PAGE C - 1................................................................

Rotation PAGE C - 1..............................................................

OPERATION PAGE C - 2..............................................................

Lines With a Bypass PAGE C - 2....................................................

Lines Without a Bypass 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 - 3................................................................

Cold Weather Preservation PAGE C - 3..............................................

TROUBLESHOOTING - SECTION D PAGE D - 1..............................

PREVENTIVE MAINTENANCE PAGE D - 3...............................................

i

TABLE OF CONTENTS

(continued)

PUMP MAINTENANCE AND REPAIR ‐ SECTION E PAGE E - 1.................

STANDARD PERFORMANCE CURVE PAGE E - 1........................................

PARTS LISTS:

Pump Model PAGE E - 3..........................................................

PUMP AND SEAL DISASSEMBLY AND REASSEMBLY PAGE E - 4.........................

Suction Check Valve Removal and Disassembly PAGE E - 4...........................

Back Cover Removal PAGE E - 4...................................................

Pump Casing Removal PAGE E - 5.................................................

Impeller Removal PAGE E - 5......................................................

Seal Removal and Disassembly PAGE E - 5..........................................

Seal Reassembly and Installation PAGE E - 5........................................

Impeller Installation and Adjustment PAGE E - 7......................................

Pump Casing Installation PAGE E - 7................................................

Back Cover Installation PAGE E - 7.................................................

Suction Check Valve Installation PAGE E - 7.........................................

Final Pump Assembly PAGE E - 7..................................................

LUBRICATION PAGE E - 8.............................................................

Seal Assembly PAGE E - 8.........................................................

Motor PAGE E - 8.................................................................

ii

10 SERIES

OM-04829

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 a 10 Series, semi‐open impeller, self‐
priming centrifugal model with a suction check
valve. It is close‐coupled to a 2 H.P., single phase or
three phase, totally enclosed fan‐cooled electric
motor. The basic material of construction for
wetted parts is gray iron, with steel wearing parts
and motor shaft. The pump is designed for handl
ing most non‐volatile, nonflammable liquids con
taining specified entrained solids.

For information or technical assistance on the mo
tor, contact the motor manufacturer's local dealer
or representative.

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 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.

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]

NOTE

Instructions to aid in installation, operation, and
maintenance or which clarify a procedure.

PAGE I - 1INTRODUCTION

10 SERIES

OM-04829

SAFETY ‐ SECTION A

This information applies to 10 Series
electric motor driven pumps. Refer to
the manual accompanying the motor
before attempting to begin operation.

This manual will alert personnel to
known procedures which require spe
cial attention, to those which could
damage equipment, and to those which
could be dangerous to personnel. How
ever, this manual cannot possibly antici
pate and provide detailed instructions
and precautions for every situation that
might occur during maintenance of the
unit. Therefore, it is the responsibility of
the owner/maintenance personnel to
ensure that only safe, established main
tenance procedures are used, and that
any procedures not addressed in this
manual are performed only after estab
lishing that neither personal safety nor
pump integrity are compromised by
such practices.

Before attempting to open or service the
pump:

1. Familiarize yourself with this man
ual.

2. Disconnect the incoming power to
the motor and lock it out to ensure
that the pump will remain inopera
tive.

3. Allow the pump to completely cool
if overheated.

4. Check the temperature before
opening any covers, plates, or
plugs.

5. Close the suction and discharge
valves.

6. Vent the pump slowly and cau
tiously.

7. Drain 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.

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. Suction and dis
charge hoses and piping must be re
moved from the pump before lifting. Lift
the pump or component only as high as
necessary and keep personnel away
from suspended objects.

After the pump has been installed, make
certain that the pump and all piping or
hose connections are tight, properly
supported and secure before operation.

PAGE A - 1SAFETY

10 SERIESOM-04829

Do not operate the pump against a
closed discharge valve for long periods
of time. If operated against a closed dis
charge valve, pump components will
deteriorate, and the liquid could come
to a boil, build pressure, and cause the
pump casing to rupture or explode.

Overheated pumps can cause severe
burns and injuries. If overheating of the
pump occurs:

1. Stop the pump immediately.

2. Ventilate the area.

3. Allow the pump to completely cool.

4. Check the temperature before
opening any covers, plates,
gauges, or plugs.

5. Vent the pump slowly and cau
tiously.

6. Refer to instructions in this manual
before restarting the pump.

Do not install and operate a non‐explo
sion proof motor in an explosive atmo
sphere. Install, connect, and operate
the motor in accordance with the Na
tional Electric Code and all local codes.
If there is a conflict between the instruc
tions in the manual accompanying the
unit and the National Electric Code or
the applicable local code, the National
or local code shall take precedence.

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 troubleshoot, test
and/or service the electrical compo
nents of this pump.

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.

Never run this pump backwards. Be cer
tain that rotation is correct before fully
engaging the pump.

Pumps and related equipment must be in
stalled and operated according to all na
tional, local and industry standards.

PAGE A - 2 SAFETY

10 SERIES OM-04829

INSTALLATION - SECTION B

Review all SAFETY information in Section A.

Since pump installations are seldom identical, this
section offers only general recommendations and
practices required to inspect, position, and ar
range the pump and piping.

Most of the information pertains to a standard
static lift application where the pump is positioned
above the free level of liquid to be pumped.

If installed in a flooded suction application where
the liquid is supplied to the pump under pressure,
some of the information such as mounting, line
configuration, and priming must be tailored to the

OUTLINE DRAWING

specific application. Since the pressure supplied
to the pump is critical to performance and safety,
be sure to limit the incoming pressure to 50% of the
maximum permissible operating pressure as
shown on the pump performance curve (see Sec
tion E, Page 1).

For further assistance, contact your Gorman‐Rupp
distributor or the Gorman‐Rupp Company.

Pump Dimensions

See Figure 1 for the approximate physical dimen
sions of this pump.

Figure 1. Pump Model 11 1/2A52-E2 1P and 11 1/2A52-E2 3P

PAGE B - 1INSTALLATION

OM-04829 10 SERIES

PREINSTALLATION INSPECTION

The pump assembly was inspected and tested be
fore shipment from the factory. Before installation,
inspect the pump for damage which may have oc
curred during shipment. Check as follows:

a. Inspect the pump and motor for cracks,

dents, damaged threads, and other obvious
damage.

b. Check for and tighten loose attaching hard

ware. Since gaskets tend to shrink after dry
ing, check for loose hardware at mating sur
faces.

c. Carefully read all tags, decals, and markings

on the pump assembly, and perform all duties
indicated. Note that the pump shaft rotates in
the required direction.

The impeller of the pump is threaded onto
the pump shaft. Reverse rotation of the
shaft can cause the impeller to unscrew
and break the suction head or casing. Dis
connect the power before checking for
proper direction of rotation.

d. Check levels and lubricate as necessary. Re

fer to LUBRICATION in the MAINTENANCE
AND REPAIR section of this manual and per
form duties as instructed.

e. If the pump and motor 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.

POSITIONING 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. Suction and dis
charge hoses and piping must be re
moved from the pump before lifting. Lift
the pump or component only as high as
necessary and keep personnel away
from suspended objects.

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.

Mounting

Locate the pump in an accessible place as close as
practical to the liquid being pumped. Level mount
ing is essential for proper operation.

The pump may have to be supported or shimmed
to provide for level operation or to eliminate vibra
tion.

Clearance

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 troubleshoot, test
and/or service the electrical compo
nents of this pump.

PAGE B - 2 INSTALLATION

It is recommended that 18 inches (457 mm) of
clearance be provided in front of the back cover to
permit removal of the cover and easy access to the
pump interior. A minimum clearance of 6 inches
(152,4 mm) must be maintained to permit removal
of the cover.

10 SERIES OM-04829

SUCTION AND DISCHARGE PIPING

Pump performance is adversely effected by in
creased suction lift, discharge elevation, and fric
tion losses. See the performance curve on Page
E‐1 to be sure your overall application allows pump
to operate within the safe operation range.

Materials

Either pipe or hose maybe used for suction and
discharge lines; however, the materials must be
compatible with the liquid being pumped. If hose is
used in suction lines, it must be the rigid‐wall, rein
forced type to prevent collapse under suction. Us
ing piping couplings in suction lines is not recom
mended.

Line Configuration

Keep suction and discharge lines as straight as
possible to minimize friction losses. Make mini
mum use of elbows and fittings, which substan
tially increase friction loss. If elbows are necessary,
use the long‐radius type to minimize friction loss.

Connections to Pump

Before tightening a connecting flange, align it ex
actly with the pump port. Never pull a pipe line into
place by tightening the flange bolts and/or cou
plings.

Lines near the pump must be independently sup
ported to avoid strain on the pump which could
cause excessive vibration, decreased bearing life,
and increased shaft and seal wear. If hose‐type
lines are used, they should have adequate support
to secure them when filled with liquid and under
pressure.

Installation closer to the pump may result in erratic
readings.

SUCTION LINES

To avoid air pockets which could affect pump prim
ing, the suction line must be as short and direct as
possible. When operation involves a suction lift, the
line must always slope upward to the pump from
the source of the liquid being pumped; if the line
slopes down to the pump at any point along the
suction run, air pockets will be created.

Fittings

Suction lines should be the same size as the pump
inlet. If reducers are used in suction lines, they
should be the eccentric type, and should be in
stalled with the flat part of the reducers uppermost
to avoid creating air pockets. Valves are not nor
mally used in suction lines, but if a valve is used,
install it with the stem horizontal to avoid air pock
ets.

Strainers

If a strainer is furnished with the pump, be certain
to use it; any spherical solids which pass through a
strainer furnished with the pump will also pass
through the pump itself.

If a strainer is not furnished with the pump, but is
installed by the pump user, make certain that the
total area of the openings in the strainer is at least
three or four times the cross section of the suction
line, and that the openings will not permit passage
of solids larger than the solids handling capability
of the pump.

This pump is designed to handle up to 1 inch (25,4
mm) diameter spherical solids.

Sealing

Gauges

Most pumps are drilled and tapped for installing
discharge pressure and vacuum suction gauges. If
these gauges are desired for pumps that are not
tapped, drill and tap the suction and discharge
lines not less than 18 inches (457,2 mm) from the
suction and discharge ports and install the lines.

Since even a slight leak will affect priming, head,
and capacity, especially when operating with a
high suction lift, all connections in the suction line
should be sealed with pipe dope to ensure an air
tight seal. Follow the sealant manufacturer's rec
ommendations when selecting and applying the
pipe dope. The pipe dope should be compatible
with the liquid being pumped.

PAGE B - 3INSTALLATION

OM-04829 10 SERIES

Suction Lines In Sumps

If a single suction line is installed in a sump, it
should be positioned away from the wall of the
sump at a distance equal to 1‐1/2 times the diame
ter of the suction line

If there is a liquid flow from an open pipe into the
sump, the flow should be kept away from the suc
tion inlet because the inflow will carry air down into
the sump, and air entering the suction line will re
duce pump efficiency.

If it is necessary to position inflow close to the suc
tion inlet, install a baffle between the inflow and the
suction inlet at a distance 1‐1/2 times the diameter
of the suction pipe. The baffle will allow entrained
air to escape from the liquid before it is drawn into
the suction inlet.

If two suction lines are installed in a single sump,
the flow paths may interact, reducing the efficiency

of one or both pumps. To avoid this, position the
suction inlets so that they are separated by a dis
tance equal to at least 3 times the diameter of the
suction pipe.

Suction Line Positioning

The depth of submergence of the suction line is

critical to efficient pump operation.
recommended minimum submergence vs. veloc
ity.

Figure 2 shows

NOTE

The pipe submergence required may be reduced
by installing a standard pipe increaser fitting at the
end of the suction line. The larger opening size will
reduce the inlet velocity. Calculate the required
submergence using the following formula based
on the increased opening size (area or diameter).

Figure 2. Recommended Minimum Suction Line Submergence vs. Velocity

PAGE B - 4 INSTALLATION

10 SERIES OM-04829

DISCHARGE LINES

Siphoning

Do not terminate the discharge line at a level lower
than that of the liquid being pumped unless a si
phon breaker is used in the line. Otherwise, a si
phoning action causing damage to the pump
could result.

Valves

If a throttling valve is desired in the discharge line,
use a valve as large as the largest pipe to minimize
friction losses. Never install a throttling valve in a
suction line.

A check valve in the discharge line is normally rec
ommended, but it is not necessary in low dis
charge head applications.

With high discharge heads, it is recommended that
a throttling valve and a system check valve be in
stalled in the discharge line to protect the pump
from excessive shock pressure and reverse rota
tion when it is stopped.

air from the top of the pump during the priming
process. This may be accomplished by installing a
bypass line from the top of the pump, back to the
source of liquid. The end of the bypass line must be
submerged. The line must be large enough to pre
vent clogging, but not so large as to affect pump
discharge capacity.

AUTOMATIC AIR RELEASE VALVE

When properly installed, a Gorman‐Rupp Auto
matic Air Release Valve will permit air to escape
through the bypass line and then close automati
cally when the pump is fully primed and pumping
at full capacity.

Some leakage (1 to 5 gallons [3.8 to 19
liters] per minute) will occur when the
valve is fully closed. Be sure the bypass
line is directed back to the wet well or
tank to prevent hazardous spills.

Consult the manual accompanying the Air Release
Valve for additional information on valve installation
and performance.

If the application involves a high discharge
head, gradually close the discharge
throttling valve before stopping the pump.

Bypass Lines

If a system check valve is used due to high dis
charge head, it may be necessary to vent trapped

Air Release Valve Installation

The Automatic Air Release Valve must be inde
pendently mounted in a horizontal position be
tween the pump discharge port and the inlet side of
the discharge check valve (see Figure 3). The inlet
opening in the Air Release Valve is equipped with
standard 1‐inch NPT pipe threads.

PAGE B - 5INSTALLATION

OM-04829 10 SERIES

INSTALL AIR RELEASE VALVE
IN HORIZONTAL POSITION

90 LONG

RADIUS
ELBOW

BLEED LINE 1”
(25,4 MM) DIA. MIN.
(CUSTOMER FUR
NISHED) DO NOT EX
TEND BELOW PUMP
OFF LIQUID LEVEL

SUPPORT
BRACKET

CLEAN‐OUT
COVER

SUCTION
LINE

WET WELL
OR SUMP

DISCHARGE PIPE

DISCHARGE
CHECK VALVE

PUMP DISCHARGE

SELF‐PRIMING
CENTRIFUGAL

PUMP

Figure 3. Typical Automatic Air Release Valve Installation

Connect the valve outlet to a bleed line which
slopes back to the wet well or sump. The bleed line
must be the same size as the outlet opening or
larger, depending on which Air Release Valve is be
ing used. If piping is used for the bleed line, avoid
the use of elbows whenever possible.

NOTE

For multiple pump installations, it is recommended

that each Air Release Valve be fitted with an inde
pendent bleeder line directed back to the wet well.
If multiple Air Release Valves are installed in a sys
tem, do not direct bleeder lines to a common mani
fold pipe. Contact your Gorman‐Rupp distributor or
the Gorman‐Rupp Company for information about
installation of an Automatic Air Release Valve for
your specific application.

PAGE B - 6 INSTALLATION

10 SERIES OM-04829

ELECTRICAL CONNECTIONS

Before connecting the motor to the incoming
power, check that the electrical service available
matches the pump motor requirements stamped
on the motor nameplate.

Do not install and operate a non‐explo
sion proof motor in an explosive atmo
sphere. Install, connect, and operate
the motor in accordance with The Na
tional Electric Code and all local codes.
If there is a conflict between the instruc
tions in the manual accompanying the

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.

VOLTAGE PHASE HP Hz RPM THERMAL

unit and The National Electric Code or
the applicable local code, The National
or local code shall take precedence.

Refer to the following motor data before making
electrical connections.

OVERLOAD

115/230

230/460

1

3

2

2

60

60

3450

3450

20 AMPS

N/A

PAGE B - 7INSTALLATION

10 SERIES

OM-04829

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.

Pump speed and operating condition
points must be within the continuous per
formance range shown on the curve (see
Section E, Page 1).

Add liquid to the pump casing when:

1. The pump is being put into service for the
first time.

2. The pump has not been used for a consider
able length of time.

3. The liquid in the pump casing has evapo
rated.

Once the pump casing has been filled, the pump
will prime and reprime as necessary.

After filling the pump casing, reinstall
and tighten the fill plug. Do not attempt
to operate the pump unless all connect
ing piping is securely installed. Other
wise, liquid in the pump forced out un
der pressure could cause injury to per
sonnel.

To fill the pump, remove the pump casing fill cover
or fill plug in the top of the casing, and add clean
liquid until the casing is filled. Replace the fill cover
or fill plug before operating the pump.

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 pump is self‐priming, but the pump should
never be operated unless there is liquid in the
pump casing.

STARTING

Consult the operations manual furnished with the
motor.

Rotation

The correct direction of pump rotation is indicated
by an arrow on the pump body or accompanying
decals. If the pump is operated in the wrong direc
tion, the impeller could become loosened from the
shaft and seriously damage the pump.

The pump must operate in the direction in
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.

OPERATION PAGE C - 1

dicated by the arrow on the pump, or ac

companying decals. Reverse rotation

could loosen the impeller and seriously

damage the pump.

OM-04829 10 SERIES

Consult the operating manual furnished with the
pump motor before attempting to start the motor.

If rotation is incorrect on a three‐phase motor, have
a qualified electrician interchange any two of the
three phase wires to change direction. If rotation is
incorrect on a single‐phase motor, consult the lit
erature supplied with the motor for specific instruc
tions.

OPERATION

Lines With a Bypass

Close the discharge throttling valve (if so
equipped) so that the pump will not have to prime
against the weight of the liquid in the discharge
line. Air from the suction line will be discharged
through the bypass line back to the wet well during
the priming cycle. When the pump is fully primed
and liquid is flowing steadily from the bypass line,
open the discharge throttling valve. Liquid will then
continue to circulate through the bypass line while
the pump is in operation.

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 completely cool before servic

ing it. Refill the pump casing with cool liquid.

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.

Strainer Check

Lines Without a Bypass

Open all valves in the discharge line and start the
motor. Priming is indicated by a positive reading on
the discharge pressure gauge or by a quieter op
eration. The pump may not prime immediately be
cause the suction line must first fill with liquid. If the
pump fails to prime within five minutes, stop it and
check the suction line for leaks.

After the pump has been primed, partially close the
discharge line throttling valve in order to fill the line
slowly and guard against excessive shock pres
sure which could damage pipe ends, gaskets,
sprinkler heads, and any other fixtures connected
to the line. When the discharge line is completely
filled, adjust the throttling valve to the required flow
rate.

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.

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

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 (508 mm) or more of mercury. If it does not,

check for air leaks in the seal, gasket, or discharge

valve.

OPERATIONPAGE C - 2

10 SERIES

OM-04829

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 incoming

power to the motor and lock it out to ensure that the

pump will remain inoperative.

Cold Weather Preservation

In below freezing conditions, drain the pump to

prevent damage from freezing. Also, clean out any

solids by flushing with a hose. Operate the pump

for approximately one minute; this will remove any

remaining liquid that could freeze the pump rotat

ing parts. If the pump will be idle for more than a

few hours, or if it has been pumping liquids con

taining a large amount of solids, drain the pump,

and flush it thoroughly with clean water. To prevent

large solids from clogging the drain port and pre

venting the pump from completely draining, insert

a rod or stiff wire in the drain port, and agitate the

liquid during the draining process. Clean out any

remaining solids by flushing with a hose.

OPERATION PAGE C - 3

TROUBLESHOOTING - SECTION D

Review all SAFETY information in Section A.

Before attempting to open or service the
pump:

1. Familiarize yourself with this manual.

2. Disconnect the incoming power to
the motor and lock it out to ensure
that the pump will remain inoperative.

3. Allow the pump to completely cool if
overheated.

4. Check the temperature before open
ing any covers, plates, or plugs.

5. Close the suction and discharge
valves.

6. Vent the pump slowly and cautiously.

7. Drain the pump.

OM-0482910 SERIES

TROUBLE POSSIBLE CAUSE PROBABLE REMEDY

PUMP FAILS TO
PRIME

PUMP STOPS OR
FAILS TO DELIVER
RATED FLOW OR
PRESSURE

Not enough liquid in casing. Add liquid to casing. See

PRIMING.

Suction check valve contaminated or
damaged.

Air leak in suction line. Correct leak.

Lining of suction hose collapsed. Replace suction hose.

Leaking or worn seal or pump gasket. Check pump vacuum. Replace

Suction lift or discharge head too high. Check piping installation and install

Strainer clogged. Check strainer and clean if neces

Air leak in suction line. Correct leak.

Lining of suction hose collapsed. Replace suction hose.

Suction intake not submerged at
proper level or sump too small.

Impeller or other wearing parts worn
or damaged.

Clean or replace check valve.

leaking or worn seal or gasket.

bypass line if needed. See INSTAL
LATION.

sary.

Check installation and correct
submergence as needed.

Replace worn or damaged parts.
Check that impeller is properly
centered and rotates freely.

TROUBLESHOOTING PAGE D - 1

OM-04829 10 SERIES

TROUBLE POSSIBLE CAUSE PROBABLE REMEDY

PUMP STOPS OR
FAILS TO DELIVER
RATED FLOW OR
PRESSURE (cont.)

PUMP REQUIRES
TOO MUCH
POWER

Leaking or worn seal or pump gasket. Check pump vacuum. Replace

leaking or worn seal or gasket.

Free impeller of debris.Impeller clogged.

Low or incorrect voltage. Measure control box voltage, both

when pump is running and when
shut off.

No voltage at line side of circuit
breaker.

Pump running back
wards.

Suction lift or discharge head too high. Check piping installation and install

Motor shaft or bearings defective. Disassemble pump and check mo

Discharge head too low.

Check power source for blown fuse,
open circuit breaker or control box,
broken lead, or loose connection.

Check direction of rotation and
correct by interchanging any two
motor leads at control box. (See
Pump Rotation, Section C).

bypass line if needed. See INSTAL
LATION.

tor and bearings.

Adjust discharge valve.

Dilute if possible.Liquid solution too thick.

PUMP CLOGS
FREQUENTLY

EXCESSIVE NOISE Cavitation in pump. Reduce suction lift and/or friction

Discharge flow too slow.

Suction check valve or foot valve
clogged or binding.

Pumping entrained air.

Impeller clogged or damaged. Clean out debris; replace damaged

Open discharge valve fully to in
crease flow rate, and run motor at
maximum governed speed.

Clean valve.

losses in suction line. Record vac
uum and pressure gauge readings
and consult local representative or
factory.

Locate and eliminate source of air
bubble.

Secure mounting hardware.Pump or drive not securely mounted.

parts.

TROUBLESHOOTINGPAGE D - 2

OM-0482910 SERIES

PREVENTIVE MAINTENANCE

Since pump applications are seldom identical, and
pump wear is directly affected by such things as
the abrasive qualities, pressure and temperature
of the liquid being pumped, this section is intended
only to provide general recommendations and
practices for preventive maintenance. Regardless
of the application however, following a routine pre
ventive maintenance schedule will help assure
trouble‐free performance and long life from your
Gorman‐Rupp pump. For specific questions con
cerning your application, contact your Gorman‐
Rupp distributor or the Gorman‐Rupp Company.

Record keeping is an essential component of a
good preventive maintenance program. Changes
in suction and discharge gauge readings (if so

equipped) between regularly scheduled inspec
tions can indicate problems that can be corrected
before system damage or catastrophic failure oc
curs. The appearance of wearing parts should also
be documented at each inspection for comparison
as well. Also, if records indicate that a certain part
(such as the seal) fails at approximately the same
duty cycle, the part can be checked and replaced
before failure occurs, reducing unscheduled down
time.

For new applications, a first inspection of wearing
parts at 250 hours will give insight into the wear rate
for your particular application. Subsequent inspec
tions should be performed at the intervals shown
on the chart below. Critical applications should be
inspected more frequently.

Preventive Maintenance Schedule

Service Interval*

Item

General Condition (Temperature, Unusual

Noises or Vibrations, Cracks, Leaks,

Loose Hardware, Etc.) I
Pump Performance (Gauges, Speed, Flow) I
Bearing Lubrication I R
Seal Lubrication (And Packing Adjustment,

If So Equipped) I R
V‐Belts (If So Equipped) I
Air Release Valve Plunger Rod (If So Equipped) I C
Front Impeller Clearance (Wear Plate) I
Rear Impeller Clearance (Seal Plate) I
Check Valve I
Pressure Relief Valve (If So Equipped) C
Pump and Driver Alignment I
Shaft Deflection I
Bearings I
Bearing Housing I
Piping I
Driver Lubrication - See Mfgr's Literature

Daily Weekly Monthly Semi‐

Annually

Annually

Legend:
I = Inspect, Clean, Adjust, Repair or Replace as Necessary
C = Clean
R = Replace

* Service interval based on an intermittent duty cycle equal to approximately 4000 hours annually.

Adjust schedule as required for lower or higher duty cycles or extreme operating conditions.

TROUBLESHOOTING PAGE D - 3

10 SERIES OM-04829

PUMP MAINTENANCE AND REPAIR ‐ SECTION E

MAINTENANCE AND REPAIR OF THE WEARING PARTS OF THE PUMP WILL MAINTAIN PEAK
OPERATING PERFORMANCE.

STANDARD PERFORMANCE FOR PUMP MODEL 11 1/2A52-E2 1P AND 11 1/2A52-E2 3P

Based on 70F (21C) clear water at sea level
with minimum suction lift. Since pump installations
are seldom identical, your performance may be dif
ferent due to such factors as viscosity, specific
gravity, elevation, temperature, and impeller trim.

Contact the Gorman‐Rupp Company to verify per
formance or part numbers.

Pump speed and operating condition

If your pump serial number is followed by an “N”,
your pump is NOT a standard production model.

MAINTENANCE & REPAIR PAGE E - 1

points must be within the continuous per
formance range shown on the curve.

PARTS PAGE

10 SERIESOM-04829

SECTION DRAWING

Figure 1. Pump Model 11 1/2A52-E2 1P And 11 1/2A52-E2 3P

MAINTENANCE & REPAIRPAGE E - 2

10 SERIES OM-04829

PARTS LIST

Pump Model 11 1/2A52-E2 1P And 11 1/2A52-E2 3P

(From S/N 1235018 Up)

If your pump serial number is followed by an “N”, your pump is NOT a standard production model. Contact
the Gorman‐Rupp Company to verify part numbers.

ITEM

PART NAME PART

NO.

NUMBER

MAT'L
CODE

QTY ITEM

NO.

PART NAME PART

NUMBER

MAT'L
CODE

QTY

 1 PUMP CASING SEE NOTE BELOW

2 IMPELLER 12368A 10010 1
3 SEAL ASSY 25285-853 --- 1

4 SUCTION FLANGE 8599 10010 1

 5 PIPE PLUG P04 15079 1
 6 FILL PLUG ASSY 48271-067 --- 1

7 NAME PLATE 38818-021 13990 1
8 DRIVE SCREW BM#04-03 17000 4

 9 WARNING PLATE 2613EV 13990 1
10 DRIVE SCREW BM#04-03 17000 4

11 SPRING RETAINER 31161-041 17000 1
12 IMP ADJUSTING SHIMS 513A 17090 1

13 STUD C0605 1/2 15991 4

14 HEX NUT D06 15991 4
15 ROTATION DECAL 2613M --- 1
16 SHAFT SLEEVE 2353 17020 1

17 SLINGER RING 14049 19140 1
18 ELECTRIC MOTOR

-2 HP 1P 28156-550 --- 1

-2 HP 3P 28196-550 --- 1
19 WARNING DECAL 2613FF --- 1
20 HEX HD CAPSCREW B0503S 15991 4
21 LOCKWASHER J05 15991 4
22 INTERMEDIATE 6732A 10010 1

23 CASING GASKET SET 504G 18000 1
24 WEAR PLATE ASSY 2643 15990 1

25 CASING DRAIN PLUG P06 15079 1

26 BACK COVER GSKT 12369G 20000 1
27 BACK COVER PLATE 12369 10010 1

28 HEX HD CAPSCREW B0808 15991 2

29 CLAMP BAR SCREW 8618 24000 1
30 CLAMP BAR 12370 11010 1
31 HEX NUT D04 15991 2
32 LOCKWASHER J04 15991 2
33 CHECK VALVE ASSY 1352 --- 1

34 -CHECK VALVE 1352G 19070 1
35 -SM VALVE WEIGHT 1354 15160 1
36 -RD HD MACH SCREW X0403 17090 1
37 -LOCKWASHER J04 17090 1
38 -LG VALVE WEIGHT 1353 10010 1

39 STUD C0606 15991 4

40 HEX NUT D06 15991 4

NOT SHOWN:

1P WARNING DECAL 2613FE --- 1
STRAINER 12383 24000 1
SUCTION STICKER 6588AG --- 1
PRIMING STICKER 6588AH --- 1
DISCHARGE STICKER 6588BJ --- 1
INSTRUCTION DECAL 2613DK --- 1
INSTRUCTION TAG 38817-013 --- 1
G‐R DECAL GR-03 --- 1

INDICATES PARTS RECOMMENDED FOR STOCK

 INCLUDED WITH 46471-556 --- 1

REPAIR PUMP CASING ASSY

MAINTENANCE & REPAIR PAGE E - 3

10 SERIESOM-04829

PUMP AND SEAL DISASSEMBLY AND REASSEMBLY

Review all SAFETY information in Section A.

Follow the instructions on all tags, label and de
cals attached to the pump.

This pump requires little service due to its rugged,
minimum‐maintenance design. However, if it be
comes necessary to inspect or replace the wearing
parts, follow these instructions which are keyed to
the sectional view (see Figure 1) and the accompa
nying parts list.

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.

that the pump will remain inopera
tive.

3. Allow the pump to completely cool
if overheated.

4. Check the temperature before
opening any covers, plates, or
plugs.

5. Close the suction and discharge
valves.

6. Vent the pump slowly and cau
tiously.

7. Drain the pump.

Suction Check Valve Removal and Disassembly

Before attempting to service the pump, remove the
pump casing drain plug (25) and drain the pump.
Clean and reinstall the drain plug.

To service the suction check valve assembly (33),
remove the suction piping. Remove the nuts (40)
securing the suction flange (4) to the pump casing
(1). Pull the check valve assembly from the suction
port.

Inspect the check valve parts for wear or damage.
If replacement is required, remove the hardware
(36 and 37), and separate the check valve gasket
(34) and weights (35 and 38).

Before attempting to service the pump, disconnect
the incoming power to the motor and lock it out to
ensure that the pump will remain inoperative.
Close all valves in the suction and discharge lines.

For motor disassembly and repair, consult the lit
erature supplied with the motor, or contact your lo
cal motor representative.

Before attempting to open or service the
pump:

1. Familiarize yourself with this man
ual.

2. Disconnect the incoming power to
the motor and lock it out to ensure

If no further disassembly is required, see Suction
Check Valve Installation.

Back Cover Removal

The wear plate (24) is easily accessible and may be
serviced by removing the back cover plate (27).
Loosen the clamp bar screw (29) and remove the
clamp bar (30). Pull the back cover and wear plate
from the pump casing. Remove the back cover
gasket (26). Clean the mating surfaces of the back
cover plate and pump casing.

Inspect the wear plate (24) and replace it if badly
scored or worn. To remove the wear plate, disen
gage the hardware (31 and 32) securing it to the
back cover.

If no further disassembly is required, see Back

Cover Installation.

MAINTENANCE & REPAIRPAGE E - 4

OM-0482910 SERIES

Pump Casing Removal

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. Suction and dis
charge hoses and piping must be re
moved from the pump before lifting. Lift
the pump or component only as high as
necessary and keep personnel away
from suspended objects.

To service the impeller or seal assembly, discon
nect the discharge piping. Remove the hardware
securing the pump casing (1) to the base.

rotating portion of the seal off the shaft as a unit.
Apply oil to the sleeve and work it under the bel
lows. Slide the rotating portion of the seal off the
sleeve.

To remove the stationary seat, remove the hard
ware (20 and 21), and slide the stationary portion of
the seal and intermediate (22) off the shaft as a
unit. Position the intermediate on a flat surface with
the impeller side down. Use thumb pressure to
press the stationary seat from the intermediate.

Remove the slinger ring (17) from the shaft.

If no further disassembly is required, see Seal

Reassembly and Installation.

Seal Reassembly and Installation

Clean the seal cavity and shaft with a cloth soaked
in fresh cleaning solvent.

Tie and tag any leveling shims used under the cas
ing mounting feet to ease reassembly.

Remove the nuts (14), and separate the pump cas
ing and gasket set (23) from the intermediate (22).
Tie and tag the gaskets, or measure and record
their thickness for ease of reassembly.

Clean the mating surfaces of the intermediate and
pump casing.

Impeller Removal

To loosen the impeller (2), immobilize the motor
shaft, and tap the vanes of the impeller in a coun
terclockwise direction (when facing the impeller)
with a block of wood or a soft‐faced mallet. Be
careful not to damage the impeller vanes. Use
caution when removing the impeller; tension on
the seal spring will be released as the impeller is
unscrewed.

Inspect the impeller and replace it if cracked or
badly worn. Tie and tag the shims or measure and
record their thickness for ease of reassembly.

Seal Removal and Disassembly

Remove the impeller shims and spring retainer (11
and 12) and seal spring. Slide shaft sleeve (16) and

Most cleaning solvents are toxic and
flammable. Use them only in a well ven
tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain
ers.

Inspect the motor shaft for damage. Small
scratches or nicks may be removed with a fine file
or emery cloth. If excessive wear exists, the shaft
will have to be replaced (refer to the motor service
manual).

The seal is not normally reused because wear pat
terns on the finished faces cannot be realigned
during reassembly. This could result in premature
failure. If necessary to reuse an old seal in an emer
gency, carefully wash all metallic parts in fresh
cleaning solvent and allow to dry thoroughly.

Handle the seal parts with extreme care to prevent
damage. Be careful not to contaminate precision
finished faces; even fingerprints on the faces can
shorten seal life. If necessary, clean the faces with a
non‐oil based solvent and a clean, lint‐free tissue.
Wipe lightly in a concentric pattern to avoid
scratching the faces.

MAINTENANCE & REPAIR PAGE E - 5

10 SERIESOM-04829

Inspect the seal components for wear, scoring,
grooves, and other damage that might cause leak
age. Clean and polish the shaft sleeve, or replace it
if there are nicks or cuts on either end. If any com
ponents are worn, replace the complete seal;
never mix old and new seal parts.

If a replacement seal is being used, remove it from
the container and inspect the precision finished

RETAINER

SPRING

IMPELLER

IMPELLER

SHIMS

IMPELLER

SHAFT

BELLOWS

faces to ensure that they are free of any foreign
matter. Discard the spring centering washer in
cluded with the seal. It is not used in this applica
tion.

To ease installation of the seal, lubricate the shaft
sleeve with water or a very small amount of oil, and
apply a drop of light lubricating oil on the finished
faces. Assemble the seal as follows, (see Figure 2).

INTERMEDIATE

SHAFT

SLEEVE

SPRING

RETAINER

ROTATING

ELEMENT

Figure 2. Seal Assembly

This seal is not designed for operation at
temperatures above 160F (71C). Do not
use at higher operating temperatures.

Slide the slinger ring (17) onto the shaft. Install the
stationary seat and press this stationary subas
sembly into the intermediate until fully seated. After
installation, wipe the sealing face lightly in a con
centric pattern with a clean, lint‐free tissue.

Position the intermediate (22) and stationary sub
assembly over the shaft and against the motor. Se

SLINGER

RING

STATIONARY

SEAT

cure the intermediate to the motor with the hard
ware (20 and 21).

Slide the rotating subassembly (consisting of the
element, bellows and retainer) over the lubricated
shaft sleeve until the rotating element is just flush
with the chamfered end of the sleeve. Slide the
sleeve over the shaft until the sealing faces con
tact. Continue to press the shaft sleeve through the
seal assembly until it seats squarely against the
shaft shoulder.

Install the seal spring and spring retainer (11 and

12).

MAINTENANCE & REPAIRPAGE E - 6

OM-0482910 SERIES

Impeller Installation and Adjustment

Inspect the impeller, and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (12) as previously removed, and screw the
impeller onto the shaft until tight.

A clearance of .010 to .012 inch (0,25 to 0,30 mm)
between the impeller and the intermediate is nec
essary for maximum pump efficiency. Measure this
clearance and add or remove impeller shims until
this clearance is reached.

Pump Casing Installation

Install the same thickness of pump casing gaskets
(23) as previously removed, and secure the pump
casing to the intermediate (22) with the nuts (14).

Do not fully tighten the nuts at this time.

NOTE

The back cover assembly must be in place to adjust
the impeller face clearance.

A clearance of .008 to .015 inch (0,20 to 0,38 mm)
between the impeller and the wear plate is also rec
ommended for maximum pump efficiency. Set this
clearance by adding or removing gaskets in the
pump casing gasket set (23) until the impeller
scrapes against the wear plate when the shaft is
turned. After the impeller binds, add approximately
.008 inch (0,20 mm) of gaskets.

After the face clearance has been set, tighten the
nuts (14) securing the pump casing to the interme
diate.

Clean any scales or debris from the contacting sur
faces on the pump casing that might prevent a
good seal with the back cover. Replace the back
cover gasket (26) and slide the back cover assem
bly into the pump casing. Be sure the wear plate
does not bind against the impeller.

NOTE

To ease future disassembly, apply a film of grease
or `Never‐Seez' on the back cover shoulder, or any
surface that contacts the pump casing. This action
will reduce rust and scale build‐up.

Secure the back cover assembly by installing the
clamp bar (30) and tightening the clamp bar screw
(29). Do not over‐tighten the clamp bar screw; it
should be just tight enough to seal the back cover
shoulder.

Suction Check Valve Installation

Inspect the check valve components and replace
as required. Subassemble the check valve weights
(35 and 38) and check valve (34) using the attach
ing hardware (36 and 37).

Position the check valve assembly (33) in the suc
tion port with the large weight toward the inside of
the pump casing. Install the suction flange (4), and
secure with the nuts (40). Check the operation of
the check valve to ensure proper seating and free
movement.

Final Pump Assembly

Be sure the pump and motor are securely

mounted to the base.

Secure the pump casing to the base with the pre
viously removed hardware. Be sure to reinstall any
leveling shims used under the casing mounting
feet.

Back Cover Installation

If the wear plate (24) was removed for replace
ment, secure it to the cover plate (27) using the at
taching hardware (31 and 32) at this time. The wear
plate must be concentric to prevent binding when
the back cover is installed.

MAINTENANCE & REPAIR PAGE E - 7

Install the suction and discharge lines and open all
valves. Make certain that all piping connections are
tight, properly supported and secure.

Be sure the pump and motor have been properly
lubricated, see LUBRICATION.

Remove the fill plug assembly (6) and fill the pump
casing with clean liquid. Reinstall the fill plug and
tighten it.

Refer to OPERATION, Section C, before putting
the pump back into service.

10 SERIESOM-04829

LUBRICATION

Seal Assembly

The seal assembly is lubricated by the medium be
ing pumped, and no additional lubrication is re
quired.

Motor

Consult the literature supplied with the motor, or
contact your local motor representative.

MAINTENANCE & REPAIRPAGE E - 8

For U.S. and International Warranty Information,

Please Visit www.grpumps.com/warranty

or call:

U.S.: 419-755-1280

International: [phone]

For Canadian Warranty Information,

Please Visit www.grcanada.com/warranty

or call:

519-631-2870

THE GORMAN‐RUPP COMPANY  MANSFIELD, OHIO

GORMAN‐RUPP OF CANADA LIMITED  ST. THOMAS, ONTARIO, CANADA