Gorman-Rupp Pumps 81-1-4A3-B User Manual

ABCDE OM-00780-03

July 22, 1986

Rev. A 09-19-07

INSTALLATION, OPERATION,

AND MAINTENANCE MANUAL

WITH PARTS LIST

80 SERIES PUMP

MODEL

81 1/4A3-B

THE GORMAN-RUPP COMPANY D MANSFIELD, OHIO

www.grpumps.com

GORMAN-RUPP OF CANADA LIMITED D ST. THOMAS, ONTARIO, CANADA Printed in U.S.A.

eCopyright by 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 − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

POSITIONING PUMP PAGE B − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lifting PAGE B − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mounting PAGE B − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SUCTION AND DISCHARGE PIPING PAGE B − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Materials PAGE B − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Line Configuration PAGE B − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Connections to Pump PAGE B − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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 − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Suction Line Positioning PAGE B − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DISCHARGE LINES PAGE B − 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Siphoning PAGE B − 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Valves PAGE B − 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bypass Lines PAGE B − 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ALIGNMENT PAGE B − 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Coupled Drives PAGE B − 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

V-Belt Drives PAGE B − 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

GROUNDING PAGE B − 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OPERATION − SECTION C PAGE C − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PRIMING PAGE C − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

STARTING PAGE C − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rotation PAGE C − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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 − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pump Vacuum Check PAGE C − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

STOPPING PAGE C − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cold Weather Preservation PAGE C − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

BEARING TEMPERATURE CHECK 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 LIST:

Pump Model PAGE E − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Pump Casing and Vane Plate Removal PAGE E − 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Impeller Removal PAGE E − 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Seal Removal PAGE E − 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shaft And Bearing Removal And Disassembly PAGE E − 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shaft And Bearing Reassembly And Installation PAGE E − 6. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Seal Reassembly and Installation PAGE E − 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Impeller Installation PAGE E − 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Vane Plate and Pump Casing Installation PAGE E − 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Final Pump Assembly PAGE E − 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

LUBRICATION PAGE E − 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Seal Assembly PAGE E − 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bearings PAGE E − 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Source PAGE E − 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ii

80 SERIES

OM−00780

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 Installation, Operation, and Mainte­nance manual is designed to help you achieve the
best performance and longest life from your Gor­man-Rupp pump.

This pump is an 80 Series, semi-open impeller, self­priming centrifugal model with a suction check
valve. The pump is designed for straight-in suction
where the medium being pumped enters directly
into the impeller eye. It is designed for handling
most non-volatile, non-flammable liquids contain­ing specified entrained solids. The basic material
of construction for wetted parts is gray iron and
bronze. The pump may be approved or modified
for handling volatile, flammable liquids only by the
Gorman-Rupp Company or an authorized distribu­tor.

Because pump installations are seldom identical,
this manual cannot possibly provide detailed in­structions and precautions for every aspect of
each specific application. Therefore, it is the re­sponsibility 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 com­promised by the installation. Pumps and related
equipment must be installed and operated ac­cording to all national, local and industry stan­dards.

The following are used to alert maintenance per­sonnel to procedures which require special atten­tion, to those which could damage equipment, and
to those which could be dangerous to personnel:

Immediate hazards which WILL result in
severe personal injury or death. These
instructions describe the procedure re­quired 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.

If there are any questions regarding the pump or
its application which are not covered in this man­ual or in other literature accompanying this unit,
please contact your Gorman-Rupp distributor, or
write:

The Gorman-Rupp Company

P.O. Box 1217

Mansfield, Ohio 44901−1217

Phone: (419) 755−1011

or:

Gorman-Rupp of Canada Limited

70 Burwell Road

St. Thomas, Ontario N5P 3R7

Phone: (519) 631−2870

Hazards or unsafe practices which COULD
result in minor personal injury or product
or property damage. These instructions
describe the requirements and the possi­ble damage which could result from failure
to follow the procedure.

NOTE

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

PAGE I − 1INTRODUCTION

80 SERIES

OM−00780

SAFETY - SECTION A

This information applies to 80 Series ba­sic pumps. Gorman-Rupp has no con­trol over or particular knowledge of the
power source which will be used. Refer
to the manual accompanying the power
source before attempting to begin oper­ation.

Because pump installations are seldom
identical, this manual cannot possibly
provide detailed instructions and pre­cautions for each specific application.
Therefore, it is the owner/installer’s re­sponsibility to ensure that applications
not addressed in this manual are per­formed only after establishing that nei­ther operator safety nor pump integrity
are compromised by the installation.

Before attempting to open or service the
pump:

1. Familiarize yourself with this man­ual.

2. Lock out or disconnect the power
source to ensure that the pump will
remain inoperative.

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 cau­tiously.

7. Drain the pump.

authorized Gorman-Rupp distributor
may modify a pump or approve its use
for handling volatile, flammable liquids.
If the pump is used for handling volatile,
flammable liquids, all drivers and/or
controls must meet industry standards
and codes for use in an explosive atmo­sphere. Do not attempt to pump liquids
for which the pump, driver and/or con­trols have not been approved, or which
may damage the pump or endanger per­sonnel as a result of pump failure.

If this pump has been approved for use
with volatile and/or flammable liquids,
be certain proper safety practices are
followed before operating or servicing
the pump. Provide adequate ventilation,
prohibit smoking, wear static-resistant
clothing and shoes. Clean up all fuel
spills immediately after occurrence.

Do not install and operate a non-explo­sion proof motor in an explosive atmo­sphere. Install, connect, and operate
the motor in accordance with the Na­tional Electric Code and all local codes.
If there is a conflict between the instruc­tions in the manual accompanying the
unit and the National Electric Code or
the applicable local code, the National
or local code shall take precedence.

This pump is designed to handle most
non-volatile, non-flammable liquids
containing specified entrained solids.
Only the Gorman-Rupp Company or an

If this pump is used with volatile and/or
flammable liquids, overheating may
produce dangerous fumes. Take pre­cautions to ensure the area surrounding
the pump is adequately ventilated. Al-

PAGE A − 1SAFETY

80 SERIESOM−00780

low the pump to cool and use extreme
caution when venting the pump, or
when removing covers, plates, plugs, or
fittings.

Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam­age to equipment. Suction and dis­charge hoses and piping must be re­moved from the pump before lifting.

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.

Do not operate the pump without the
shields and/or guards in place over the
drive shaft, belts, and/or couplings, or
other rotating parts. Exposed rotating
parts can catch clothing, fingers, or
tools, causing severe injury to person­nel.

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 cau­tiously.

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

Do not remove plates, covers, gauges,
pipe plugs, or fittings from an over­heated pump. Vapor pressure within the
pump can cause parts being disen­gaged to be ejected with great force. Al­low the pump to completely cool before
servicing.

Never run this pump backwards. Be cer­tain that rotation is correct before fully
engaging the pump.

Do not operate the pump against a
closed discharge valve for long periods
of time. If operated against a closed dis­charge valve, pump components will
deteriorate, and the liquid could come

PAGE A − 2 SAFETY

Pumps and related equipment must be in­stalled and operated according to all na­tional, local and industry standards.

80 SERIES OM−00780

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 ar­range 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 Sec­tion 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 dimen­sions of this pump.

Figure 1. Pump Model 81 1/4A3−B

PREINSTALLATION INSPECTION

The pump assembly was inspected and tested be­fore shipment from the factory. Before installation,
inspect the pump for damage which may have oc­curred during shipment. Check as follows:

a. Inspect the pump for cracks, dents, damaged

threads, and other obvious damage.

b. Check for and tighten loose attaching hard-

ware. Since gaskets tend to shrink after dry­ing, check for loose hardware at mating sur­faces.

c. Carefully read all tags, decals, and markings

on the pump assembly, and perform all duties
indicated.

PAGE B − 1INSTALLATION

OM−00780 80 SERIES

Only operate this pump in the direction in­dicated by the arrow on the pump body
and on the accompanying decal. Other­wise, the impeller could become loosened
from the shaft and seriously damage the
pump. Refer to Rotation in OPERATION,
Section C.

d. Check levels and lubricate as necessary. Re-

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

e. If the pump has been stored for more than 12

months, some of the components or lubri­cants may have exceeded their maximum
shelf life. These must be inspected or re-
placed to ensure maximum pump service.

If the maximum shelf life has been exceeded, or if
anything appears to be abnormal, contact your
Gorman-Rupp distributor or the factory to deter­mine the repair or updating policy. Do not put the
pump into service until appropriate action has
been taken.

The pump assembly can be seriously
damaged if the cables or chains used to lift
and move the unit are improperly wrapped
around the pump.

Mounting

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

The pump may have to be supported or shimmed
to provide for level operation or to eliminate vibra­tion.

SUCTION AND DISCHARGE PIPING

Pump performance is adversely effected by in­creased suction lift, discharge elevation, and fric­tion losses. See the performance curve on Page
E−1 to be sure your overall application allows
pump to operate within the safe operation range.

POSITIONING PUMP

Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam­age to equipment. Suction and dis­charge hoses and piping must be re­moved from the pump before lifting.

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.

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, rein­forced type to prevent collapse under suction. Us­ing piping couplings in suction lines is not recom­mended.

Line Configuration

Keep suction and discharge lines as straight as
possible to minimize friction losses. Make mini­mum use of elbows and fittings, which substan­tially 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 ex­actly with the pump port. Never pull a pipe line into
place by tightening the flange bolts and/or cou­plings.

PAGE B − 2 INSTALLATION

80 SERIES OM−00780

Lines near the pump must be independently sup­ported 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.

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.
Installation closer to the pump may result in erratic
readings.

SUCTION LINES

To avoid air pockets which could affect pump prim­ing, 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

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 1/4 inch (6,4
mm) diameter spherical solids.

Sealing

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 air­tight seal. Follow the sealant manufacturer’s rec­ommendations when selecting and applying the
pipe dope. The pipe dope should be compatible
with the liquid being pumped.

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 diame­ter 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 suc­tion inlet because the inflow will carry air down into
the sump, and air entering the suction line will re­duce pump efficiency.

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 in­stalled with the flat part of the reducers uppermost
to avoid creating air pockets. Valves are not nor­mally used in suction lines, but if a valve is used,
install it with the stem horizontal to avoid air pock­ets.

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

If it is necessary to position inflow close to the suc­tion 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 dis­tance 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. Figure 2 shows
recommended minimum submergence vs. veloc-

ity.

PAGE B − 3INSTALLATION

OM−00780 80 SERIES

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

DISCHARGE LINES

Siphoning

Do not terminate the discharge line at a level lower
than that of the liquid being pumped unless a si­phon breaker is used in the line. Otherwise, a si­phoning 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.

With high discharge heads, it is recommended that
a throttling valve and a system check valve be in­stalled in the discharge line to protect the pump

from excessive shock pressure and reverse rota­tion when it is stopped.

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 dis­charge head, it may be necessary to vent trapped
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 pre­vent clogging, but not so large as to affect pump
discharge capacity.

PAGE B − 4 INSTALLATION

80 SERIES OM−00780

ALIGNMENT

The alignment of the pump and its power source is
critical for trouble-free mechanical operation. In
either a flexible coupling or V-belt driven system,
the driver and pump must be mounted so that their
shafts are aligned with and parallel to each other. It
is imperative that alignment be checked after the
pump and piping are installed, and before opera­tion.

NOTE

Check Rotation, Section C, before final alignment
of the pump.

When mounted at the Gorman-Rupp factory, driver
and pump are aligned before shipment. Misalign­ment will occur in transit and handling. Pumps
must be checked and realigned before operation.
Before checking alignment, tighten the foundation
bolts. The pump casing feet and/or pedestal feet,
and the driver mounting bolts should also be tightly
secured.

of the outer ends of the coupling hub every 90 de­grees. The coupling is in alignment when the hub
ends are the same distance apart at all points (see
Figure 3A).

Figure 3A. Aligning Spider Type Couplings

When checking alignment, disconnect
the power source to ensure that the
pump will remain inoperative.

Adjusting the alignment in one direction
may alter the alignment in another direc­tion. check each procedure after altering
alignment.

Coupled Drives

When using couplings, the axis of the power
source must be aligned to the axis of the pump
shaft in both the horizontal and vertical planes.
Most couplings require a specific gap or clearance
between the driving and the driven shafts. Refer to
the coupling manufacturer’s service literature.

Align spider insert type couplings by using calipers
to measure the dimensions on the circumference

Figure 3B. Aligning Non-Spider Type

Couplings

Align non-spider type couplings by using a feeler
gauge or taper gauge between the coupling halves
every 90 degrees. The coupling is in alignment
when the hubs are the same distance apart at all
points (see Figure 3B).

Check parallel adjustment by laying a straightedge
across both coupling rims at the top, bottom, and
side. When the straightedge rests evenly on both
halves of the coupling, the coupling is in horizontal
parallel alignment. If the coupling is misaligned,
use a feeler gauge between the coupling and the
straightedge to measure the amount of misalign­ment.

V-Belt Drives

When using V-belt drives, the power source and
the pump must be parallel. Use a straightedge
along the sides of the pulleys to ensure that the pul­leys are properly aligned (see Figure 3C). In drive
systems using two or more belts, make certain that

PAGE B − 5INSTALLATION

OM−00780 80 SERIES

the belts are a matched set; unmatched sets will
cause accelerated belt wear.

Do not operate the pump without the
shields and/or guards in place over the
drive shaft, belts, and/or couplings, or
other rotating parts. Exposed rotating
parts can catch clothing, fingers, or
tools, causing severe injury to person­nel.

GROUNDING

If the pump has been approved to pump volatile or
flammable liquids, the unit must be grounded by

MISALIGNED:

SHAFTS

NOT PARALLEL

Figure 3C. Alignment of V-Belt Driven Pumps

MISALIGNED:

SHAFTS

NOT IN LINE

ALIGNED: SHAFTS

PARALLEL AND

SHEAVES IN LINE

attaching the ground wire assembly to a ground
rod in order to eliminate electrostatic build-up by
the liquid being pumped. Install the ground rod in
accordance with the National Electrical Codes and
all local codes. Be sure the fastening device makes
a tight electrical connection with the rod and the
pump.

Tighten the belts in accordance with the belt manu­facturer’s instructions. If the belts are too loose,
they will slip; if the belts are too tight, there will be
excessive power loss and possible bearing failure.
Select pulleys that will match the proper speed ra­tio; overspeeding the pump may damage both
pump and power source.

Inspect and test the ground wire assembly
for conductivity. replace broken or frayed
wire before resuming operation.

PAGE B − 6 INSTALLATION

80 SERIES

OM−00780

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.
Only the Gorman-Rupp Company or an
authorized Gorman-Rupp distributor
may modify a pump or approve its use
for handling volatile, flammable liquids.
If the pump is used for handling volatile,
flammable liquids, all drivers and/or
controls must meet industry standards
and codes for use in an explosive atmo­sphere. Do not attempt to pump liquids
for which the pump, driver and/or con­trols have not been approved, or which
may damage the pump or endanger per­sonnel as a result of pump failure.

PRIMING

Install the pump and piping as described in IN­STALLATION. Make sure that the piping connec-

tions are tight, and that the pump is securely
mounted. Check that the pump is properly lubri­cated (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.

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.

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 consider­able length of time.

3. The liquid in the pump casing has evapo­rated.

Once the pump casing has been filled, the pump

If this pump has been approved for use

will prime and reprime as necessary.

with volatile and/or flammable liquids,
be certain proper safety practices are
followed before operating or servicing
the pump. Provide adequate ventilation,
prohibit smoking, wear static-resistant
clothing and shoes. Clean up all fuel
spills immediately after occurrence.

After filling the pump casing, reinstall
and tighten the fill plug. Do not attempt
to operate the pump unless all connect­ing piping is securely installed. Other­wise, liquid in the pump forced out un­der pressure could cause injury to per­sonnel.

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

OPERATION PAGE C − 1

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.

OM−00780

80 SERIES

STARTING

Consult the operations manual furnished with the
power source.

If the pump has been approved for use with petro­leum products, be sure the pump unit is properly
grounded before operation. See GROUNDING,
Section B.

Rotation

The correct direction of pump rotation is counter­clockwise when facing the impeller. If the pump is
operated in the wrong direction, the impeller could
become loosened from the shaft and seriously
damage the pump.

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.

Lines Without a Bypass

Open all valves in the discharge line and start the
engine. Priming is indicated by a positive reading
on the discharge pressure gauge or by a quieter
operation. The pump may not prime immediately
because 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.

Only operate this pump in the direction in­dicated by the arrow on the pump body
and on the accompanying decal. Other­wise, the impeller could become loosened
from the shaft and seriously damage the
pump.

Consult the operating manual furnished with the
power source before attempting to start the power
source.

If an electric motor is used to drive the pump, re­move V-belts, couplings, or otherwise disconnect
the pump from the motor before checking motor
rotation. Operate the motor independently while
observing the direction of the motor shaft, or cool­ing fan.

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 lit­erature supplied with the motor for specific instruc­tions.

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 pres­sure 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 sur­faces, or at pump connections or fittings. Keep all
line connections and fittings tight to maintain maxi­mum pump efficiency.

Liquid Temperature And Overheating

The maximum liquid temperature for this pump is
160_ F (71_C). Do not apply it at a higher operating
temperature.

Overheating can occur if operated with the valves
in the suction or discharge lines closed. Operating
against closed valves could bring the liquid to a

OPERATIONPAGE C − 2

80 SERIES

OM−00780

boil, build pressure, and cause the pump to rup­ture 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 over­heated pump. Vapor pressure within the
pump can cause parts being disen­gaged to be ejected with great force. Al­low the pump to completely cool before
servicing.

Strainer Check

If a suction strainer has been shipped with the
pump or installed by the user, check the strainer
regularly, and clean it as necessary. The strainer
should also be checked if pump flow rate begins to
drop. If a vacuum suction gauge has been in­stalled, 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 neces­sary, 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

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, lock out or disconnect
the power source 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 rotat­ing parts. If the pump will be idle for more than a
few hours, or if it has been pumping liquids con­taining 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 pre­venting 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.

BEARING TEMPERATURE CHECK

inches (508,0 mm) or more of mercury. If it does
not, check for air leaks in the seal, gasket, or dis­charge valve.

Open the suction line, and read the vacuum gauge
with the pump primed and at operation speed.
Shut off the pump. The vacuum gauge reading will
immediately drop proportionate to static suction

OPERATION PAGE C − 3

Bearings normally run at higher than ambient tem­peratures because of heat generated by friction.
Temperatures up to 160_F (71_C) are considered
normal for bearings, and they can operate safely to
at least 180_F (82_C).

Checking bearing temperatures by hand is inaccu­rate. Bearing temperatures can be measured ac-

OM−00780

80 SERIES

curately by placing a contact-type thermometer
against the housing. Record this temperature for
future reference.

A sudden increase in bearing temperatures is a
warning that the bearings are at the point of failing
to operate properly. Make certain that the bearing
lubricant is of the proper viscosity and at the cor-

rect level (see LUBRICATION in Section E). Bear­ing overheating can also be caused by shaft
misalignment and/or excessive vibration.

When pumps are first started, the bearings may
seem to run at temperatures above normal. Con­tinued operation should bring the temperatures
down to normal levels.

OPERATIONPAGE C − 4

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. Lock out or disconnect the power
source to ensure that the pump
will remain inoperative.

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 cau­tiously.

7. Drain the pump.

OM−0078080 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.

Lining of suction hose collapsed.

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

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

Strainer clogged. Check strainer and clean if neces-

Air leak in suction line.

Lining of suction hose collapsed.

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

Strainer clogged. Check strainer and clean if neces-

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

Clean or replace check valve.

Correct leak.

Replace suction hose.

leaking or worn seal or gasket.

stall bypass line if needed. See
INSTALLATION.

sary.

Correct leak.

Replace suction hose.

leaking or worn seal or gasket.

sary.

Check installation and correct sub­mergence as needed.

TROUBLESHOOTING PAGE D − 1

OM−00780 80 SERIES

TROUBLE POSSIBLE CAUSE PROBABLE REMEDY

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

PUMP REQUIRES
TOO MUCH
POWER

PUMP
CLOGS FRE­QUENTLY

Impeller or other wearing parts worn
or damaged.

Impeller clogged. Free impeller of debris.

Pump speed too slow. Check driver output; check belts

Discharge head too high. Install bypass line.

Suction lift too high. Measure lift w/vacuum gauge. Re-

Pump speed too high. Check driver output; check that

Discharge head too low. Adjust discharge valve.

Liquid solution too thick. Dilute if possible.

Bearing(s) frozen. Disassemble pump and check

Liquid solution too thick. Dilute if possible.

Discharge flow too slow. Open discharge valve fully to in-

Suction check valve or foot valve
clogged or binding.

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

or couplings for slippage.

duce lift and/or friction losses in
suction line.

sheaves or couplings are cor­rectly sized.

bearing(s).

crease flow rate, and run power
source at maximum governed
speed.

Clean valve.

EXCESSIVE NOISE Cavitation in pump.

Pumping entrained air.

Pump or drive not securely mounted.

Impeller clogged or damaged.

BEARINGS
RUN TOO HOT

Bearing temperature is high, but
within limits.

Low or incorrect lubricant. Check for proper type and level of

Suction and discharge lines not
properly supported.

Drive misaligned. Align drive properly.

Reduce suction lift and/or friction
losses in suction line. Record vac­uum and pressure gauge readings
and consult local representative or
factory.
Locate and eliminate source of air
bubble.
Secure mounting hardware.

Clean out debris; replace dam­aged parts.

Check bearing temperature regu­larly to monitor any increase.

lubricant.

Check piping installation for
proper support.

TROUBLESHOOTINGPAGE D − 2

OM−0078080 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 pre­ventive maintenance schedule will help assure
trouble-free performance and long life from your
Gorman-Rupp pump. For specific questions con­cerning your application, contact your Gorman­Rupp 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 inspec­tions can indicate problems that can be corrected
before system damage or catastrophic failure oc­curs. 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 inspec­tions 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

OM−00780

80 SERIES

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 81 1/4A3−B

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 dif­ference due to such factors as viscosity, specific
gravity, elevation, temperature, and impeller trim.

Contact the Gorman-Rupp Company to verify per­formance 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 per­formance range shown on the curve.

80 SERIES OM−00780

SECTION DRAWING

PARTS PAGE

Figure 1. Pump Model 81 1/4A3−B

MAINTENANCE & REPAIRPAGE E − 2

OM−00780

80 SERIES

PARTS LIST

Pump Model 81 1/4A3-B

(From S/N 859498 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
NO.

1 PUMP CASING 8709 10010 1
2 IMPELLER 6030 14010 1
3 SEAL ASSEMBLY 25271−821 −−− 1
4 DISCHARGE STICKER 6588BJ −−− 1
5 FILL PLUG ASSEMBLY 48271−060 −−− 1
6 RD HD MACHINE SCREW X#10−02 14990 2
7 LOCK WASHER J#10 15991 2
8 INTERMEDIATE PEDESTAL 5711 10010 1

9 STUD C0605 15991 4
10 HEX NUT D06 15991 4
11 ROTATION DECAL 2613M −−− 1
12 BEARING HOUSING 10671 10010 1
13 SLINGER RING 31131−062 19120 1
14 INBOARD BEARING S528 −−− 1

14A OUTBOARD BEARING S528 −−− 1

15 RETAINING RING S494 −−− 1
16 BEARING ADJ SHIM SET 2X 17090 1
17 SHAFT KEY N0303−1/2 15990 1
18 IMPELLER SHAFT 10673A 15010 1
19 HEX HD CAPSCREW B0605 15991 4
20 HEX NUT D06 15991 4
21 LOCK WASHER J06 15991 4
22 CASING GASKET 5709G 18000 1
23 VANE PLATE 38632−515 10010 1
24 VANE PLATE O-RING S461 −−− 1
25 CASING DRAIN PLUG P04 15079 1
26 NAME PLATE 38812−041 13990 1
27 DRIVE SCREW BM#04−03 17000 4
28 SUCTION STICKER 6588AG −−− 1
29 IMPELLER ADJ SHIM SET 5889 170001 1
30 SEAL WASHER 6087 14110 1

NOT SHOWN:

PART NAME

G-R DECAL GR−02 −−− 1
INSTRUCTION TAG 38817−011 −−− 1
INSTRUCTION TAG 38817−056 −−− 1
PRIMING STICKER 6588AH −−− 1

PART
NUMBER

MAT’L
CODE

QTY

INDICATES PARTS RECOMMENDED FOR STOCK

MAINTENANCE & REPAIR PAGE E − 3

80 SERIESOM−00780

PUMP AND SEAL DISASSEMBLY AND REASSEMBLY

Review all SAFETY information in Section A.

Follow the instructions on all tags, label and de­cals attached to the pump.

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

This manual will alert personnel to known proce­dures 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 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 establishing that neither personal safety
nor pump integrity are compromised by such prac­tices.

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

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

5. Close the suction and discharge
valves.

6. Vent the pump slowly and cau­tiously.

7. Drain the pump.

If this pump has been approved for use
with volatile and/or flammable liquids,
be certain proper safety practices are
followed before operating or servicing
the pump. Provide adequate ventilation,
prohibit smoking, wear static-resistant
clothing and shoes. Clean up all fuel
spills immediately after occurrence.

Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam­age to equipment. Suction and dis­charge hoses and piping must be re­moved from the pump before lifting.

For power source disassembly and repair, consult
the literature supplied with the power source, or
contact your local power source representative.

Before attempting to open or service the
pump:

1. Familiarize yourself with this man­ual.

2. Lock out or disconnect the power
source to ensure that the pump will
remain inoperative.

3. Allow the pump to completely cool
if overheated.

Pump Casing and Vane Plate Removal

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 impeller (2), vane plate (23) or seal
assembly (3), disconnect the suction and dis­charge piping.

Remove the nuts (10) securing the pump casing
(1) to the intermediate (8). Remove the pump cas­ing by pulling straight away.

Remove the casing gasket (22) and vane plate O­ring (24).

To remove the vane plate, disengage the hardware
(6 and 7).

MAINTENANCE & REPAIRPAGE E − 4

OM−0078080 SERIES

Impeller Removal

Immobilize the impeller by wedging a block of
wood or a brass rod between the vanes.

Install the shaft key (17). Install a lathe dog on the
drive end of the shaft (18) with the V" notch posi­tioned over the shaft key.

With the impeller rotation still blocked, see Figure 2
and use a long piece of heavy bar stock to pry
against the arm of the lathe dog in a counterclock­wise direction (when facing the drive end of the
shaft). Use caution not to damage the shaft or key­way. When the impeller breaks loose, remove the
lathe dog, key and wood block. Unscrew the im­peller in a counterclockwise direction.

Turn

Counterclockwise

intermediate and rotating portion of the seal as­sembly off the shaft.

Position the intermediate on a flat surface with the
impeller side down. Use a suitably sized dowel to
press the seal stationary seat and element out of
the intermediate from the back side.

If no further disassembly is required, see Seal

Reassembly and Installation.

Shaft And Bearing Removal And Disassembly

When the pump is properly operated and main­tained, the bearing housing should not require dis­assembly. Disassemble the shaft and bearings

only when there is evidence of wear or damage.

Lathe Dog Arm

V" Notch

Heavy

Bar Stock

Figure 2. Loosening Impeller

Inspect the impeller and replace it if cracked or
badly worn. Slide the impeller adjusting shims (29)
off the impeller shaft. Tie and tag the shims, or
measure and record their thickness for ease of
reassembly.

Seal Removal

(Figures 1 and 3)

Remove the seal washer (30), spring centering
washer and seal spring.

Shaft Key

Impeller Shaft

Lathe Dog

Setscrew

Shaft and bearing disassembly in the field
is not recommended. These operations
should be performed only in a properly
equipped shop by qualified personnel.

Remove the slinger ring (13) from the shaft. Re­move the bearing housing mounting hardware
from the base. Tie and tag any shims used under
the mounting feet for leveling.

Use snap ring pliers to remove the bearing retain­ing ring (15) from the bearing housing bore. Re­move the bearing shim set (16); tie and tag the
shims, or measure and record their thickness for
ease of reassembly.

Place a block of wood against the impeller end of
the shaft, and tap the shaft and assembled bear­ings (14 and 14A) out of the bearing housing.

Apply oil to the seal area of the shaft. Remove the
hardware (19, 20 and 21) securing the intermedi­ate to the bearing housing (12). Carefully slide the

MAINTENANCE & REPAIR PAGE E − 5

After removing the shaft and bearings, clean and
inspect the bearings in place as follows.

To prevent damage during removal from
the shaft, it is recommended that bearings
be cleaned and inspected in place. It is
strongly recommended that the bearings
be replaced any time the shaft and bear-
ings are removed.

Clean the bearing housing, shaft and all compo­nent parts (except the bearings) with a soft cloth
soaked in cleaning solvent. Inspect the parts for
wear or damage and replace as necessary.

Most cleaning solvents are toxic and
flammable. Use them only in a well-ven­tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain­ers.

Inspect the shaft for distortion, nicks or scratches
or thread damage on the impeller end. Dress small
nicks and burrs with a fine file or emery cloth. Re­place the shaft if defective.

Clean the bearings thoroughly in fresh cleaning
solvent. Dry the bearings with filtered compressed
air and coat with light oil.

80 SERIESOM−00780

If bearing replacement is required, use a bearing
puller or an arbor (or hydraulic) press to remove
the bearings from the impeller shaft.

Shaft And Bearing Reassembly And
Installation

Clean and inspect the bearings as indicated in
Shaft and Bearing Removal and Disassembly.

To prevent damage during removal from
the shaft, it is recommended that bearings
be cleaned and inspected in place. It is
strongly recommended that the bearings
be replaced any time the shaft and and
bearings are removed.

The bearings (14 and 14A) may be heated to ease
installation. An induction heater, electric oven, or
hot plate may be used to heat the bearings. Bear­ings should never be heated with a direct flame or
directly on a hot plate.

Heat the bearings to a uniform temperature no
higher than 250_F (120_C), and slide the bearings
onto the shaft, one at a time, until they are fully
seated. This should be done quickly, in one con­tinuous motion, to prevent the bearings from cool­ing and sticking on the shaft.

Bearings must be kept free of all dirt and
foreign material. Failure to do so will great­ly shorten bearing life.

Rotate the bearings by hand to check for rough­ness or binding. If rotation is rough, replace the
bearings.

The bearing tolerances provide a tight press fit
onto the shaft and a snug slip fit into the bearing
housing. Replace the bearings, shaft, or bearing
housing if the proper bearing fit is not achieved.

Use caution when handling hot bear­ings to prevent burns.

After the bearings have been installed and allowed
to cool, check to ensure that they have not moved
out of position in shrinking. If movement has oc­curred, use a suitably sized sleeve and a press to
reposition the bearings.

If heating the bearings is not practical, use a suit­ably sized sleeve and an arbor (or hydraulic) press
to install the bearings on the shaft.

MAINTENANCE & REPAIRPAGE E − 6

OM−0078080 SERIES

When installing the bearings onto the
shaft, never press or hit against the outer
race, balls, or ball cage. Press only on the
inner race.

Slide the shaft and assembled bearings into the
bearing housing until the inboard bearing (14) is
fully seated against the bore shoulder.

When installing the shaft and bearings into
the bearing bore, push against the outer
race. Never hit the balls or ball cage.

Install the same thickness of bearing adjusting
shims (16) as previously removed. Reinstall the re­taining ring (15) and check shaft endplay.

NOTE

Shaft endplay should be .002 to .010 inch (0,05 to
0,25 mm). Add or remove bearing adjusting shims
to obtain this endplay.

Install the slinger ring (13). Install any leveling
shims used under the bearing housing feet. Se­cure the bearing housing to the base using the pre­viously removed mounting hardware.

Seal Reassembly and Installation

(Figures 1 and 3)

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

Most cleaning solvents are toxic and
flammable. Use them only in a well-ven­tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain­ers.

The seal is not normally reused because wear pat­terns on the finished faces cannot be realigned
during reassembly. This could result in premature
failure. If necessary to reuse an old seal in an emer­gency, 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.

Inspect the seal components for wear, scoring,
grooves, and other damage that might cause leak­age. Clean and polish the seal area of the shaft.
Small nicks and burrs can be removed using a fine
file or emery cloth. If any components 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
faces to ensure that they are free of any foreign
matter.

To ease installation of the seal, lubricate the seal
area of the shaft 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 3).

MAINTENANCE & REPAIR PAGE E − 7

80 SERIESOM−00780

BELLOWS

SEAL WASHER

IMPELLER

IMPELLER

NUT

IMPELLER

SHAFT

IMPELLER

SHIMS

SPRING

CENTERING

WASHER

SPRING

RETAINER

DRIVE BAND

SEAL PLATE

ROTATING

ELEMENT

STATIONARY

ELEMENT

STATIONARY

SEAT

Figure 3. Seal Assembly

This seal is not designed for operation at
temperatures above 160_F (71_C). Do not
use at higher operating temperatures.

Install the stationary seat element in the stationary
seat. Use your thumbs to press this subassembly
into the seal bore in the intermediate until fully and
squarely seated in the seal plate bore. After instal­lation, wipe the stationary element sealing face
lightly in a concentric pattern with a clean, lint-free
cloth to remove any dirt or fingerprints.

Carefully slide the assembled intermediate and
stationary portion of the seal over the impeller shaft
(18) and secure the intermediate to the bearing
housing with the hardware (19, 20 and 21).

Slide the rotating portion of the seal assembly onto
the shaft until the seal faces contact.

Impeller Installation

Inspect the impeller, and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (29) as previously removed. Apply ‘Loctite
Retaining Compound No. 242’ or equivalent com­pound on the shaft threads, and screw the impeller
onto the shaft until tight.

A clearance of .002 to .006 inch ( 0,05 to 0,15 mm)
between the impeller and the vane plate (23) is
necessary for maximum pump efficiency. Position
the vane plate over the impeller, and use a feeler
gauge to measure this clearance. Add or remove
impeller shims until the proper clearance is
achieved.

Vane Plate and Pump Casing Installation

Apply ‘3-M Adhesive EC-847’ or equivalent com­pound to the back of the vane plate, and secure the
vane plate to the intermediate with the hardware ( 6
and 7). Check impeller-to-vane plate clearance as
described in Impeller Installation.

Install the seal spring, spring centering washer and
seal washer (30).

Install the vane plate O-ring (24) and the pump cas­ing gasket (22). Carefully slide the pump casing

MAINTENANCE & REPAIRPAGE E − 8

OM−0078080 SERIES

over the vane plate, and secure it to the intermedi­ate with the nuts (10).

Install the shaft key (17).

Final Pump Assembly

Be sure the pump and power source are securely

mounted to the base. Reconnect the power source
to the pump.

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

Fill the pump casing with clean liquid. Reinstall the
fill plug (5) and tighten it.

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

LUBRICATION

Seal Assembly

The seal assembly is lubricated by the medium be­ing pumped. No additional lubrication is required.

Bearings

The bearings in this pump are lubricated from the
manufacturer and permanently sealed. No addi­tional lubrication is required.

Power Source

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

MAINTENANCE & REPAIR PAGE E − 9

For U.S. and International Warranty Information,

Please Visit www.grpumps.com/warranty

or call:

U.S.: 419−755−1280

International: +1−419−755−1352

For Canadian Warranty Information,

Please Visit www.grcanada.com/warranty

or call:

519−631−2870

THE GORMAN-RUPP COMPANY D MANSFIELD, OHIO

GORMAN-RUPP OF CANADA LIMITED D ST. THOMAS, ONTARIO, CANADA