GORMAN-RUPP PUMPS 80 Series Application guide

OM-03939-01
June 8, 1993
Rev. D - 08/14/19
GORMAN‐RUPP PUMPS
www.grpumps.com
1993 Gorman‐Rupp Pumps Printed in U.S.A.
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
WITH PARTS LIST
80 SERIES PUMPS
MODELS
84A2-(SAE 4/8)
84A2-(SAE 4/10)

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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:
The engine exhaust from this
product contains chemicals
known to the State of California to
cause cancer, birth defects or
other reproductive harm.

TABLE OF CONTENTS
i
INTRODUCTION PAGE I - 1...................................................
SAFETY - SECTION A PAGE A - 1............................................
INSTALLATION - SECTION B PAGE B - 1.....................................
PREINSTALLATION INSPECTION PAGE B - 1...............................................
POSITIONING PUMP PAGE B - 1..........................................................
Lifting PAGE B - 1....................................................................
Alignment PAGE B - 1................................................................
Mounting PAGE B - 1................................................................
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 - 2..................................................................
SUCTION LINES PAGE B - 2..............................................................
Fittings PAGE B - 2..................................................................
Strainers PAGE B - 2.................................................................
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.............................................................
OPERATION - SECTION C PAGE C - 1.......................................
PRIMING PAGE C - 1....................................................................
STARTING PAGE C - 1...................................................................
OPERATION PAGE C - 1.................................................................
Lines With a Bypass PAGE C - 1.......................................................
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 - 2...................................................................
Cold Weather Preservation PAGE C - 3.................................................
BEARING TEMPERATURE CHECK PAGE C - 3.............................................
TROUBLESHOOTING - SECTION D PAGE D - 1...............................
PUMP MAINTENANCE AND REPAIR - SECTION E PAGE E - 1.................
PARTS LISTS:
Pump End Assemblies PAGE E - 3.....................................................
SAE 4/8 Drive Assembly PAGE E - 5...................................................

TABLE OF CONTENTS
(continued)
ii
SAE 4/10 Drive Assembly PAGE E - 7..................................................
PUMP AND SEAL DISASSEMBLY AND REASSEMBLY PAGE E - 8............................
Suction Check Valve Removal PAGE E - 8..............................................
Pump Casing And Wear Plate Removal PAGE E - 8......................................
Impeller Removal PAGE E - 9.........................................................
Seal Removal and Disassembly PAGE E - 9.............................................
Separating Intermediate And Drive Assembly From Engine (SAE 4/8 Model) PAGE E - 9.....
Separating Intermediate/Drive Assembly From Engine (SAE 4/10 Model) PAGE E - 9........
Shaft and Bearing Removal and Disassembly PAGE E - 10...............................
Shaft and Bearing Reassembly and Installation PAGE E - 11..............................
Securing Intermediate And Drive Assembly To Engine (SAE 4/8 Model) PAGE E - 12.........
Securing Intermediate And Drive Assembly To Engine (SAE 4/10 Model) PAGE E - 12........
Seal Reassembly and Installation PAGE E - 13..........................................
Impeller Installation And Adjustment PAGE E - 15........................................
Pump Casing and Wear Plate Installation PAGE E - 15...................................
Suction Check Valve Installation PAGE E - 15...........................................
Final Pump Assembly PAGE E - 16....................................................
LUBRICATION PAGE E - 16...............................................................
Seal Assembly PAGE E - 16...........................................................
Bearings PAGE E - 16................................................................
Engine PAGE E - 17..................................................................

80 SERIES OM-03939
PAGE I - 1INTRODUCTION
INTRODUCTION
Thank You for purchasing a Gorman‐Rupp pump.
Read this manual carefully to learn how to safely
install and operate your pump. Failure to do so
could result in personal injury or damage to the
pump.
Because pump installations are seldom identical,
this manual cannot possibly provide detailed in
structions and precautions for every aspect of
each specific application. Therefore, it is the re
sponsibility of the owner/installer of the pump to
ensure that applications not addressed in this
manual are performed only after establishing that
neither operator safety nor pump integrity are com
promised by the installation. Pumps and related
equipment must be installed and operated ac
cording to all national, local and industry stan
dards.
If there are any questions regarding the pump or
its application which are not covered in this man
ual or in other literature accompanying this unit,
please contact your Gorman‐Rupp distributor, or
The Gorman‐Rupp Company:
The Gorman‐Rupp Company
P.O. Box 1217
Mansfield, Ohio 44901-1217
Phone: [phone]
or:
Gorman‐Rupp of Canada Limited
70 Burwell Road
St. Thomas, Ontario N5P 3R7
Phone: [phone]
For information or technical assistance on the
power source, contact the power source manufac
turer's local dealer or representative.
HAZARD AND INSTRUCTION
DEFINITIONS
The following are used to alert maintenance per
sonnel to procedures which require special atten
tion, to those which could damage equipment, and
to those which could be dangerous to personnel:
Immediate hazards which WILL result in
severe personal injury or death. These
instructions describe the procedure re
quired and the injury which will result
from failure to follow the procedure.
Hazards or unsafe practices which
COULD result in severe personal injury
or death. These instructions describe
the procedure required and the injury
which could result from failure to follow
the procedure.
Hazards or unsafe practices which COULD
result in minor personal injury or product
or property damage. These instructions
describe the requirements and the possi
ble damage which could result from failure
to follow the procedure.
NOTE
Instructions to aid in installation, operation, and
maintenance or which clarify a procedure.

80 SERIES OM-03939
PAGE A - 1SAFETY
SAFETY - SECTION A
This information applies to 80 Series en
gine driven pumps. Refer to the manual
accompanying the engine before at
tempting to begin operation.
Because pump installations are seldom
identical, this manual cannot possibly
provide detailed instructions and pre
cautions for each specific application.
Therefore, it is the owner/installer's re
sponsibility to ensure that applications
not addressed in this manual are per
formed only after establishing that nei
ther operator safety nor pump integrity
are compromised by the installation.
Before attempting to open or service the
pump:
1. Familiarize yourself with this man
ual.
2. Switch off the engine ignition and
disconnect the positive battery
cable 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 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 materials, or any liq
uids which may damage the pump or en
danger personnel 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 positioned,
make certain that the pump and all pip
ing or hose connections are tight, prop
erly supported and secure before oper
ation.
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.
Do not remove plates, covers, gauges,
pipe plugs, or fittings from an over

80 SERIESOM-06752
PAGE A - 2 SAFETY
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.
Do not operate an internal combustion
engine in an explosive atmosphere.
When operating internal combustion
engines in an enclosed area, make cer
tain that exhaust fumes are piped to the
outside. These fumes contain carbon
monoxide, a deadly gas that is color
less, tasteless, and odorless.
Never tamper with the governor to gain
more power. The governor establishes
safe operating limits that should not be
exceeded. The maximum continuous
operating speed for this pump is 2100
RPM.
Pumps and related equipment must be in
stalled and operated according to all na
tional, local and industry standards.
Allow an over‐heated pump to com
pletely cool before servicing. Do not re
move plates, covers, gauges, or fittings
from an over‐heated pump. Liquid with
in the pump can reach boiling tempera
tures, and vapor pressure within the
pump can cause parts being disen
gaged to be ejected with great force. Af
ter the pump completely cools, drain the
liquid from the pump by removing the
casing drain plug. Use caution when re
moving the plug to prevent injury to per
sonnel from hot liquid.
Fuel used by internal combustion en
gines presents an extreme explosion
and fire hazard. Make certain that all
fuel lines are securely connected and
free of leaks. Never refuel a hot or run
ning engine. Avoid overfilling the fuel
tank. Always use the correct type of fuel.

OM-0393980 SERIES
PAGE B - 1INSTALLATION
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 posi
tioned 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
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.
Since this pump is fitted with a Gorman‐Rupp dou
ble grease lubricated seal, the maximum incoming
pressure must be reduced to 10 p.s.i.
For further assistance, contact your Gorman‐Rupp
distributor or the Gorman‐Rupp Company.
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 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 warnings and cautions con
tained in this manual or affixed to the pump,
and perform all duties indicated.
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 has been stored for more than 12
months, some of the components or lubri
cants 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 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.
Alignment
The alignment of the pump end and engine are crit
ical for trouble‐free performance. During initial in

OM-03939 80 SERIES
PAGE B - 2 INSTALLATION
stallation or repair of the pump end, refer to Secur
ing Intermediate And Drive Assembly To Engine
in MAINTENANCE AND REPAIR, Section E for
details.
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.
If the pump has been mounted on a movable base,
make certain the base is stationary by setting the
brake and blocking the wheels before attempting
to operate the pump.
To ensure sufficient lubrication and fuel supply to
the engine, do not position the pump and engine
more than 15off horizontal for continuous opera
tion. The pump and engine may be positioned up
to 30off horizontal for intermittent operation
only; however, the engine manufacturer should be
consulted for continuous operation at angles
greater than 15.
SUCTION AND DISCHARGE PIPING
Pump performance is adversely effected by in
creased suction lift, discharge elevation, and fric
tion losses. Contact the factory to be sure your
overall application allows the 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.
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 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

OM-0393980 SERIES
PAGE B - 3INSTALLATION
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 1/8 inch
(28,6 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 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.
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. Figure 1 shows
recommended minimum submergence vs. veloc
ity.
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

OM-03939 80 SERIES
PAGE B - 4 INSTALLATION
on the increased opening size (area or diameter).
Figure 1. 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 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.
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.
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 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.

OM-03939
80 SERIES
OPERATION PAGE C - 1
OPERATION - SECTION C
Review all SAFETY information in Section A.
Follow the instructions on all tags, labels and
decals attached to the pump.
This pump is designed to handle dirty
water containing specified entrained
solids. Do not attempt to pump volatile,
corrosive, or flammable materials, or
any liquids which may damage the
pump or endanger personnel as a result
of pump failure.
PRIMING
Install the pump and piping as described in IN
STALLATION. Make sure that the piping connec
tions are tight, and that the pump is securely
mounted. Check that the pump is properly lubri
cated (see LUBRICATION in MAINTENANCE
AND REPAIR).
This 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 consider
able length of time.
3. The liquid in the pump casing has evapo
rated.
When installed in a flooded suction application,
simply open the system valves and permit the in
coming liquid to evacuate the air. After the pump
and piping system have completely filled, evacu
ate any remaining air pockets in the pump or suc
tion line by loosening pipe plug or opening bleeder
valves.
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.
STARTING
Consult the operations manual furnished with the
engine.
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.

OM-03939 80 SERIES
OPERATIONPAGE C - 2
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.
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.
Liquid Temperature And Overheating
The maximum liquid temperature for this pump is
110F (43C). Do not apply it at a higher operating
temperature.
Overheating can occur if operated with the valves
in the suction or discharge lines closed. Operating
against closed valves could bring the liquid to a
boil, build pressure, and cause the pump to rup
ture or explode. If overheating occurs, stop the
pump and allow it to cool before servicing it. Refill
the pump casing with cool liquid.
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
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. Since
this pump is fitted with a Gorman‐Rupp double
grease lubricated seal, the maximum incoming
pressure must be reduced to 10 p.s.i.
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 (508,0 mm) or more of mercury. If it does
not, check for air leaks in the seal, gasket, or dis
charge valve.
Open the suction line, and read the vacuum gauge
with the pump primed and at operation speed.
Shut off the pump. The vacuum gauge reading will
immediately drop proportionate to static suction
lift, and should then stabilize. If the vacuum reading
falls off rapidly after stabilization, an air leak exists.
Before checking for the source of the leak, check
the point of installation of the vacuum gauge.
STOPPING
Never halt the flow of liquid suddenly. If the liquid
being pumped is stopped abruptly, damaging
shock waves can be transmitted to the pump and
piping system. Close all connecting valves slowly.
On engine driven pumps, reduce the throttle
speed slowly and allow the engine to idle briefly be
fore stopping.
If the application involves a high discharge

OM-03939
80 SERIES
OPERATION PAGE C - 3
head, gradually close the discharge
throttling valve before stopping the pump.
After stopping the pump, take other precautions 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.
BEARING TEMPERATURE CHECK
Bearings normally run at higher than ambient tem
peratures 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 inaccu
rate. Bearing temperatures can be measured ac
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). Bear
ing 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. Con
tinued operation should bring the temperatures
down to normal levels.

80 SERIES OM-03939
TROUBLESHOOTING PAGE D - 1
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. Shut down the engine and take other
precautions 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.
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PUMP FAILS TO
PRIME Suction check valve contaminated or
damaged.
Clean or replace check valve.
Air leak in suction line.
Lining of suction hose collapsed.
Correct leak.
Replace suction hose.
Leaking or worn seal or pump gasket. Check pump vacuum. Replace
leaking or worn seal or gasket.
Suction lift or discharge head too high. Check piping installation and in
stall bypass line if needed. See
INSTALLATION.
Strainer clogged. Check strainer and clean if neces
sary.
Not enough liquid in casing. Add liquid to casing. See PRIMING.
Suction check valve or foot valve
clogged or binding.
Clean valve
PUMP STOPS OR
FAILS TO DELIVER
RATED FLOW OR
PRESSURE
Air leak in suction line.
Lining of suction hose collapsed.
Correct leak.
Replace suction hose.
Leaking or worn seal or pump gasket. Check pump vacuum. Replace
leaking or worn seal or gasket.
Strainer clogged. Check strainer and clean if neces
sary.

OM-03939 80 SERIES
TROUBLESHOOTINGPAGE D - 2
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PUMP REQUIRES
TOO MUCH
POWER
PUMP CLOGS
FREQUENTLY
Impeller or other wearing parts worn
or damaged.
Replace worn or damaged parts.
Check that impeller is properly
centered and rotates freely.
Impeller clogged. Free impeller of debris.
Pump speed too slow. Check engine output; consult en
gine operation manual.
Discharge head too low. Adjust discharge valve.
Liquid solution too thick. Dilute if possible.
Bearing(s) frozen. Disassemble pump and check
bearing(s).
Liquid solution too thick. Dilute if possible.
Discharge flow too slow. Open discharge valve fully to in
crease flow rate, and run power
source at maximum governed
speed.
Suction check valve or foot valve
clogged or binding.
Clean valve.
Suction intake not submerged at
proper level or sump too small.
Check installation and correct sub
mergence as needed.
Suction lift or discharge head too
high.
Check piping installation and in
stall bypass line if needed. See
INSTALLATION.
Pump speed too high. Check engine output.
PUMP STOPS OR
FAILS TO DELIVER
RATED FLOW OR
PRESSURE
(CONT'D)
Discharge line clogged or restricted;
hose kinked.
Check discharge lines; straighten
hose.
EXCESSIVE NOISE Cavitation in pump.
Impeller clogged or damaged.
Pump or drive not securely mounted.
Pumping entrained air.
Reduce suction lift and/or friction
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.
Clean out debris; replace dam
aged parts.
BEARINGS RUN
TOO HOT
Bearing temperature is high, but
within limits.
Check bearing temperature regu
larly to monitor any increase.
Low or incorrect lubricant. Check for proper type and level of
lubricant.
Suction and discharge lines not
properly supported.
Check piping installation for
proper support.
Drive misaligned. Align drive properly.

80 SERIES OM-03939
TROUBLESHOOTING PAGE D - 3
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.
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
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.
Preventive Maintenance Schedule
Item Daily Weekly Monthly Semi‐
Annually
Annually
Service Interval*

OM-03939
80 SERIES
MAINTENANCE & REPAIR PAGE E - 1
PUMP MAINTENANCE AND REPAIR - SECTION E
Maintenance and repair of the wearing parts of
the pump will maintain peak operating perform
ance.
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.
The following are used to alert maintenance per
sonnel to procedures which require special atten
tion, to those which could damage equipment, and
to those which could be dangerous to personnel:
Immediate hazards which WILL result in
severe personal injury or death. These
instructions describe the procedure re
quired and the injury which will result
from failure to follow the procedure.
Hazards or unsafe practices which
COULD result in severe personal injury
or death. These instructions describe
the procedure required and the injury
which could result from failure to follow
the procedure.
Hazards or unsafe practices which COULD
result in minor personal injury or product
or property damage. These instructions
describe the requirements and the possi
ble damage which could result from failure
to follow the procedure.
NOTE
Instructions to aid in installation, operation, and
maintenance or which clarify a procedure.

80 SERIESOM-03939
MAINTENANCE & REPAIRPAGE E - 2
ILLUSTRATION
2
6
8
7
5
5
4
4
36
40
341
19
10
9
17
16
37
11 12
15
39
14
21
38
20
13
1
33
27
27
28
28
42
23
24
25
19
29
29
32
31
35
34
43
30
22
18
26
SEAL AREA DETAIL
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Figure 1. 84A2‐(SAE 4/8) and 84A2-(SAE 4/10) Pump End Assemblies

ITEM
NO.
PART NAME PART
NUMBER
QTY ITEM
NO.
PART NAME PART
NUMBER
QTY
OM-03939
80 SERIES
MAINTENANCE & REPAIR PAGE E - 3
PARTS LIST
84A2‐(SAE 4/8) and 84A2-(SAE 4/10) Pump End Assemblies
(From S/N 1027789 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.
1 PUMP CASING SEE NOTE BELOW 1
2 INTERMEDIATE 36 10010 1
3IMPELLER SHAFT 45 15010 1
4BEARING CONE S1087 2
5BEARING CUP S1086 2
6 BEARING CLOSURE 44 10010 1
7BEARING SHIM SET S114 1
8 BEARING CAP 43X 10010 1
9 LOCK WASHER J06 15991 4
10 HEX HEAD CAP SCREW B0604 15991 4
11 SEAL ASSEMBLY GS1250 1
12 SEAL PLATE ASSY 2546 10010 1
13 SEAL LINER 2205 14080 1
14 WASHER 3349 15990 1
15 ADJ SHIM SET 37J 17090 1
16 IMPELLER 2691D 10010 1
17 WEAR PLATE ASSY. 2612A 15990 1
18 LOCK WASHER J08 15991 2
19 HEX NUT D08 15991 10
20 STUD C0809 15991 8
21 GASKET SET 34GB 19370 1
22 STUD C1013 15991 8
23 GASKET 7336G 19370 1
24 FLAP VALVE ASSY 7340 1
-LG VALVE WEIGHT 7337 24000 1
-SM VALVE WEIGHT 7339 15990 1
-CHECK VALVE GASKET 7341 19000 1
-HEX HEAD CAPSCREW B0403 17000 2
-LOCK WASHER J04 17090 2
25 CHECK VALVE SEAT 7336 10010 1
26 MACHINE SCREW X0403 17090 2
27 GASKET 1676G 19480 2
28 4" NPT FLANGE 1756 10010 2
29 HEX NUT D10 15991 16
30 STUD C1010 15991 8
31 CLOSE PIPE NIPPLE T64 15070 1
32 PIPE ELBOW R64 11990 1
33 FILL PLUG ASSY W/ TAG 48271-067 1
34 PIPE PLUG P20 10009 1
35 PIPE PLUG P04 15079 1
36 GREASE CUP S35 1
37 HVY PIPE NIPPLE THA0416 15079 1
38 PIPE ELBOW AG04 11999 1
39 GREASE CUP S1509 1
40 INTERMEDIATE GUARD 42381-031 24152 2
41 SHAFT KEY N0607 15990 1
42 NAMEPLATE BLANK 38819-004 13000 1
43 DRIVE SCREW BM#04-03 17000 4
NOT SHOWN:
DISCHARGE STICKER 6588BJ 1
FILL TO PRIME STICKER 6588AH 1
GREASE CUP INSTR 6588BD 1
SUCTION STICKER 6588AG 1
INSTRUCTION TAG 38817-085 1
BEARING LUB DECAL 38816-075 1
G‐R DECAL GR-03 1
STRAINER ASSEMBLY 46641-027 24150 1
DRIVE ASSY SAE 3-4/10 44162-119 1
INDICATES PARTS RECOMMENDED FOR STOCK
INCLUDED WITH REPAIR 46472-313 1
PUMP CASING ASSY