Page 1
ACDEU
OM-06525-01
February 10, 2012
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
WITH PARTS LIST
PA SERIES PUMP
MODEL
PAV3A60C‐B
THE GORMAN‐RUPP COMPANY MANSFIELD, OHIO
www.grpumps.com
GORMAN‐RUPP OF CANADA LIMITED ST. THOMAS, ONTARIO, CANADA Printed in U.S.A.
2012 The Gorman‐Rupp Company
Page 2
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:
Page 3
TABLE OF CONTENTS
INTRODUCTION PAGE I - 1.................................................
SAFETY ‐ SECTION A PAGE A - 1............................................
INSTALLATION - SECTION B PAGE B - 1....................................
Pump Dimensions PAGE B - 1.....................................................
PREINSTALLATION INSPECTION PAGE B - 2............................................
POSITIONING PUMP PAGE B - 2.......................................................
Lifting PAGE B - 2.................................................................
Mounting PAGE B - 2.............................................................
SUCTION AND DISCHARGE PIPING PAGE B - 3.........................................
Materials PAGE B - 3..............................................................
Line Configuration PAGE B - 3......................................................
Connections to Pump PAGE B - 3..................................................
Gauges PAGE B - 3...............................................................
SUCTION LINES PAGE B - 3...........................................................
Fittings PAGE B - 3...............................................................
Strainers PAGE B - 3..............................................................
Sealing PAGE B - 4...............................................................
Suction Lines In Sumps PAGE B - 4.................................................
Suction Line Positioning PAGE B - 4................................................
DISCHARGE LINES PAGE B - 5........................................................
Siphoning PAGE B - 5.............................................................
Valves PAGE B - 5................................................................
ELECTRICAL CONNECTIONS PAGE B - 5...............................................
Grouding Methods PAGE B - 6.....................................................
Field Wiring Connections (Incoming Power) PAGE B - 6...............................
Voltage Imbalance PAGE B - 7.....................................................
Power Cable Connections PAGE B - 7...............................................
Control Box Adjustment PAGE B - 7.................................................
ALIGNMENT PAGE B - 7..............................................................
AUTO‐START PAGE B - 8.............................................................
Float Switch Installation PAGE B - 8.................................................
Submersible Transducer Installation PAGE B - 9......................................
OPERATION - SECTION C PAGE C - 1......................................
STARTING AND OPERATION PAGE C - 1...............................................
Control Box Function PAGE C - 1...................................................
Component Function PAGE C - 1...................................................
Rotation PAGE C - 2..............................................................
Priming PAGE C - 2...............................................................
Leakage PAGE C - 2..............................................................
Pump Vacuum Check PAGE C - 3..................................................
Priming Chamber Discharge Line PAGE C - 3........................................
Liquid Temperature And Overheating PAGE C - 3.....................................
Strainer Check PAGE C - 3.........................................................
STOPPING PAGE C - 3................................................................
Manual Stopping PAGE C - 3.......................................................
i
Page 4
TABLE OF CONTENTS
(continued)
Automatic Stopping PAGE C - 3....................................................
PERIODIC CHECKS PAGE C - 3.......................................................
Seal Cavity and Bearing Lubrication PAGE C - 3......................................
Bearing Temperature Check PAGE C - 3.............................................
Air Compressor Drive Belt PAGE C - 4...............................................
COLD WEATHER PRESERVATION PAGE C - 4...........................................
TROUBLESHOOTING - SECTION D PAGE D - 1..............................
PREVENTIVE MAINTENANCE PAGE D - 3...............................................
PUMP MAINTENANCE AND REPAIR ‐ SECTION E PAGE E - 1.................
STANDARD PERFORMANCE CURVE PAGE E - 1........................................
PARTS LISTS:
Pump Model PAGE E - 3..........................................................
Pump End Assembly PAGE E - 5...................................................
Repair Rotating Assembly PAGE E - 9...............................................
Priming Chamber Kit PAGE E - 10...................................................
Priming Chamber Assembly PAGE E - 11.............................................
Air Compressor Assembly PAGE E - 12...............................................
PUMP AND SEAL DISASSEMBLY AND REASSEMBLY PAGE E - 13.........................
Priming Chamber Removal And Disassembly PAGE C - 14..............................
Discharge Check Valve Removal and Disassembly PAGE C - 14.........................
Back Cover Plate and Wear Plate Removal PAGE C - 14................................
Separating Pump And Drive Assembly From Engine PAGE C - 14........................
Draining Oil From Seal Cavity PAGE C - 15............................................
Loosening Impeller PAGE C - 15.....................................................
Pump Casing Removal PAGE C - 15.................................................
Impeller Removal PAGE C - 16......................................................
Seal Removal PAGE C - 16..........................................................
Shaft and Bearing Removal and Disassembly PAGE C - 16.............................
Shaft and Bearing Reassembly and Installation PAGE C - 17............................
Seal Reassembly and Installation PAGE C - 18........................................
Impeller Installation And Adjustment PAGE C - 20......................................
Pump Casing Installation PAGE C - 20................................................
Securing Pump End To Power Source PAGE C - 20....................................
Wear Plate and Back Cover Installation And Adjustment PAGE C - 20....................
Discharge Check Valve Reassembly And Installation PAGE C - 21.......................
Priming Chamber Assembly And Installation PAGE C - 22...............................
LUBRICATION PAGE C - 22.............................................................
Seal Assembly PAGE C - 22.........................................................
Bearings PAGE C - 22..............................................................
ii
Page 5
PA SERIES OM-06525
INTRODUCTION
Thank You for purchasing a Gorman‐Rupp pump.
Read this manual carefully to learn how to safely
install and operate your pump. Failure to do so
could result in personal injury or damage to the
pump.
This pump is a PA Series, priming‐assisted centrif
ugal model. The unit is designed for handling non‐
volatile, non‐flammable liquids containing speci
fied entrained solids. The basic material of con
struction is ductile iron, with stainless steel shaft
and ductile iron wearing parts.
This manual will alert personnel to known proce
dures which require special attention, to those
which could damage equipment, and to those
which could be dangerous to personnel. However,
this manual cannot possibly anticipate and provide
detailed precautions for every situation that might
occur during maintenance of the unit. Therefore, it
is the responsibility of the owner/maintenance per
sonnel to ensure that only safe, established main
tenance procedures are used, and that any proce
dures not addressed in this manual are performed
only after establishing that neither personal safety
nor pump integrity are compromised by such prac
tices.
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.
For information or technical assistance on the
power source, contact the power source manufac
turer's local dealer or representative.
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: (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 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.
PAGE I - 1INTRODUCTION
Page 6
PA SERIES OM-06525
SAFETY - SECTION A
This information applies to PA 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 be
gin operation.
This manual will alert personnel to
known procedures which require spe
cial attention, to those which could
damage equipment, and to those which
could be dangerous to personnel. How
ever, this manual cannot possibly antici
pate and provide detailed instructions
and precautions for every situation that
might occur during maintenance of the
unit. Therefore, it is the responsibility of
the owner/maintenance personnel to
ensure that only safe, established main
tenance procedures are used, and that
any procedures not addressed in this
manual are performed only after estab
lishing that neither personal safety nor
pump integrity are compromised by
such practices.
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 which may
damage the pump or endanger person
nel as a result of pump failure.
After the pump has been positioned,
make certain that the pump and all pip
ing connections are tight, properly sup
ported and secure before operation.
Do not operate the pump without the
guards in place over the rotating parts.
Exposed rotating parts can catch cloth
ing, fingers, or tools, causing severe in
jury to personnel.
Before attempting to open or service the
pump:
1. Familiarize yourself with this man
ual.
2. Disconnect or lock out 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 cau
tiously.
7. Drain the pump.
Do not remove plates, covers, gauges,
pipe plugs, or fittings from an over
heated pump. Vapor pressure within the
pump can cause parts being disen
gaged to be ejected with great force. Al
low the pump to cool before servicing.
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
PAGE A - 1SAFETY
Page 7
PA SERIESOM-06525
to a boil, build pressure, and cause the
pump casing to rupture or explode.
Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam
age to equipment. Suction and dis
charge hoses and piping must be re
moved from the pump before lifting.
Do not attempt to disengage any part of
an overheated pump unit. Vapor pres
sure within the pump casing can eject
these parts with great force when they
are disengaged. Allow the pump to
completely cool before servicing it.
rials which could cause illness through
direct exposure or emitted fumes. Wear
adequate protective clothing when
working on the pump or piping.
This pump may be equipped with an op
tional automatic starting system, and
therefore subject to automatic restart.
Keep hands and clothing away from the
unit to prevent injury during automatic
operation. Disconnect the positive bat
tery cable before performing any main
tenance. Failure to do so may result in
serious personal injury.
This pump may be used to handle mate
Pumps and related equipment must be in
stalled and operated according to all na
tional, local and industry standards.
PAGE A - 2 SAFETY
Page 8
INSTALLATION - SECTION B
OM-06525PA SERIES
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
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.
For further assistance, contact your Gorman‐Rupp
distributor or the Gorman‐Rupp Company.
Pump Dimensions
See Figure 1 for the approximate physical dimen
sions of this pump.
Figure 1. Pump Model PAV3A60C-B
PAGE B - 1INSTALLATION
Page 9
OM-06525 PA SERIES
PREINSTALLATION INSPECTION
The pump assembly was inspected and tested be
fore shipment from the factory. Before installation,
inspect the pump for damage which may have oc
curred during shipment. Check as follows:
a. Inspect the pump 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. Note the di
rection of rotation indicated on the pump.
Check that the pump shaft rotates counter
clockwise when facing the impeller.
POSITIONING PUMP
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.
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
Only operate this pump in the direction in
dicated by the arrow on the pump body or
on the accompanying decal. Refer to RO
TATION 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 per
form duties as instructed.
e. If the pump and power source have been
stored for more than 12 months, some of the
components or lubricants may have ex
ceeded their maximum shelf life. These must
be inspected or replaced to ensure maxi
mum 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.
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.
SUCTION AND DISCHARGE PIPING
Pump performance is adversely effected by in
creased suction lift, discharge elevation, and fric
tion losses. See the performance curve and oper
ating range shown on Page E‐1 to be sure your
overall application allows pump to operate within
the safe operation range.
Materials
Either pipe or hose maybe used for suction and
discharge lines; however, the materials must be
compatible with the liquid being pumped. If hose is
used in suction lines, it must be the rigid‐wall, rein
forced type to prevent collapse under suction. Us
ing piping couplings in suction lines is not recom
mended.
PAGE B - 2 INSTALLATION
Page 10
OM-06525PA SERIES
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.
to avoid creating air pockets. Valves are not nor
mally used in suction lines, but if a valve is used,
install it with the stem horizontal to avoid air pock
ets.
Strainers
If a strainer is furnished with the pump, be certain
to use it; any spherical solids which pass through a
strainer furnished with the pump will also pass
through the pump itself.
If a strainer is not furnished with the pump, but is
installed by the pump user, make certain that the
total area of the openings in the strainer is at least
three or four times the cross section of the suction
line, and that the openings will not permit passage
of solids larger than the solids handling capability
of the pump.
This pump is designed to handle up to 3 inch (76,2
mm) diameter spherical solids.
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
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.
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
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
PAGE B - 3INSTALLATION
Page 11
OM-06525 PA SERIES
air to escape from the liquid before it is drawn into
the suction inlet.
If two suction lines are installed in a single sump,
the flow paths may interact, reducing the efficiency
of one or both pumps. To avoid this, position the
suction inlets so that they are separated by a dis
tance equal to at least 3 times the diameter of the
suction pipe.
Suction Line Positioning
The depth of submergence of the suction line is
critical to efficient pump operation.
recommended minimum submergence vs. veloc
ity.
Figure 2 shows
NOTE
The pipe submergence required may be reduced
by installing a standard pipe increaser fitting at the
end of the suction line. The larger opening size will
reduce the inlet velocity. Calculate the required
submergence using the following formula based
on the increased opening size (area or diameter).
Figure 2. Recommended Minimum Suction Line Submergence vs. Velocity
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.
PAGE B - 4 INSTALLATION
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.
If the application involves a high discharge
Page 12
OM-06525PA SERIES
head, gradually close the discharge
throttling valve before stopping the pump.
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 opera
tion.
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. Misalign
ment 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.
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
of the outer ends of the coupling hub every 90.
The coupling is in alignment when the hub ends
are the same distance apart at all points (see Fig
ure 3).
Figure 3. 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 direc
tion. 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
Figure 4. Aligning Non‐Spider Type Couplings
Align non‐spider type couplings by using a feeler
gauge or taper gauge between the coupling halves
every 90. The coupling is in alignment when the
hubs are the same distance apart at all points (see
Figure 4).
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 misalign
ment.
Drive Belts
When using drive belts, the power source and the
pump must be parallel. Use a straightedge along
PAGE B - 5INSTALLATION
Page 13
OM-06525 PA SERIES
the sides of the pulleys to ensure that the pulleys
are properly aligned (see Figure 5). In drive sys
tems using two or more belts, make certain that the
belts are a matched set; unmatched sets will cause
accelerated belt wear.
Do not operate the pump without the
guard in place over the rotating parts.
exposed rotating parts can catch cloth
ing, fingers, or tools, causing severe in
jury to personnel.
DRIVE BELT TENSIONING
General Rules of Tensioning
For new drive belts, check the tension after 5, 20
and 50 hours of operation and re‐tension as re
MISALIGNED:
SHAFTS
NOT PARALLEL
MISALIGNED:
SHAFTS
NOT IN LINE
ALIGNED: SHAFTS
PARALLEL AND
SHEAVES IN LINE
Figure 5. Alignment of V‐Belt Driven Pumps
quired (see the following procedure for measuring
belt tension). Thereafter, check and re‐tension if re
quired monthly or at 500 hour intervals, whichever
comes first.
Tighten the belts in accordance with the belt manu
facturer'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 ra
tio; overspeeding the pump may damage both
pump and power source.
Ideal drive belt tension is the lowest tension at
which the belt will not slip under peak load condi
tions. Do not over‐tension drive belts. Over‐ten
sioning will shorten both drive belt and bearing life.
Under‐tensioning will cause belt slippage. Always
keep belts free from dirt, grease, oil and other for
eign material which may cause slippage.
PAGE B - 6 INSTALLATION
Page 14
PA SERIES
OM-06525
OPERATION - SECTION C
Review all SAFETY information in Section A.
Follow the instructions on all tags, labels and de
cals attached to the pump.
This pump is designed to handle most
non‐volatile, non‐flammable liquids
containing specified entrained solids.
Do not attempt to pump volatile, corro
sive, or flammable liquids which may
damage the pump or endanger person
nel as a result of pump failure.
Pump speed and operating conditions
must be within the performance range
shown on page E‐1.
STARTING
If an electric motor is used to drive the pump, re
move 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 cool
ing 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 liter
ature supplied with the motor for specific instruc
tions.
PRIMING
The pump will begin to prime upon startup. The air
in the suction line will be discharged from the prim
ing chamber discharge line. Complete priming is
indicated by a positive discharge pressure read
ing.
If full priming is not achieved, the discharge check
valve may be malfunctioning. If this occurs, shut
down the pump and consult the Maintenance and
Repair section of this manual for further details.
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).
Consult the operations manual furnished with the
power source.
Rotation
The correct direction of pump rotation is counter
clockwise when facing the impeller. The pump
could be damaged and performance adversely af
fected by incorrect rotation. If pump performance
is not within the specified limits (see the curve on
page E‐1), check the direction of power source ro
tation before further troubleshooting.
OPERATION PAGE C - 1
OPERATION
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
160F (71C). 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
Page 15
PA SERIESOM-06525
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.
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
removing the plug to prevent injury to
personnel from hot liquid.
As a safeguard against rupture or explosion due to
heat, this pump is equipped with a pressure relief
valve which will open if vapor pressure within the
pump casing reaches a critical point. If overheating
does occur, stop the pump immediately and allow
it to cool before servicing it. Approach any over
heated pump cautiously. It is recommended that
the pressure relief valve assembly be replaced at
each overhaul, or any time the pump casing over
heats and activates the valve. Never replace this
valve with a substitute which has not been speci
fied or provided by the Gorman‐Rupp Company.
Never introduce air or steam pressure into the
pump casing or piping to remove a blockage. This
could result in personal injury or damage to the
equipment. If backflushing is absolutely neces
sary, liquid pressure must be limited to 50% of the
maximum permissible operating pressure shown
on the pump performance curve.
Pump Vacuum Check
Read the vacuum gauge with the pump primed
and at operation speed. Shut off the pump. The
vacuum gauge reading will immediately drop pro
portionate to static suction lift, and should then sta
bilize. 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 installa
tion of the vacuum gauge.
Priming Chamber Discharge Line
Check the priming chamber discharge line for liq
uid bypass. If bypass occurrs, shut down the
pump. Refer to the Maintenance and Repair sec
tion of this manual and disassemble and clean the
float and valve assembly inside the priming cham
ber.
STOPPING
Consult the operations manual furnished with the
power source.
After stopping the pump, lock out or disconnect
the power source to ensure that the pump will re
main inoperative.
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.
Do not operate the pump against a
closed discharge throttling valve for
long periods of time. If operated against
a closed discharge throttling valve,
pump components will deteriorate, and
the liquid could come to a boil, build
pressure, and cause the pump casing to
rupture or explode.
OPERATIONPAGE C - 2
Page 16
PA SERIES
OM-06525
PERIODIC CHECKS
Seal And Bearing Cavity Lubrication
Both the seal and bearing cavities were fully lubri
cated at the factory. Check the lubrication levels
before startup, and regularly thereafter as indi
cated in the Maintenance and Repair section of
this manual. When lubrication is required, use only
SAE No. 30 non‐detergent oil.
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 160F (71C) are considered
normal for bearings and they can operate safely to
at least 180F (82C).
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 temperature 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 MAINTENANCE
AND REPAIR). Bearing overheating can also be
caused by shaft misalignment and/or excessive vi
bration.
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.
OPERATION PAGE C - 3
Page 17
PA SERIES
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 open
ing any covers, plates, or plugs.
5. Close the suction and discharge
valves.
6. Vent the pump slowly and cautiously.
7. Drain the pump.
OM-06502
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PUMP FAILS TO
PRIME
PUMP STOPS OR
FAILS TO DELIVER
RATED FLOW OR
PRESSURE
Discharge check valve contami
nated, damaged, or unable to seat.
Air leak in suction line. Correct leak.
Lining of suction hose collapsed. Replace suction hose.
Leaking or worn seal or pump gasket. Check pump vacuum. Replace
Suction lift or discharge head too high. Check piping installation and install
Air compressor damaged/belts broken. Check and repair/replace.
Strainer clogged. Check strainer and clean if neces
Eductor clogged. Check and clean eductor.
Air leak in suction line. Correct leak.
Lining of suction hose collapsed. Replace suction hose.
Leaking or worn seal or pump gasket. Check pump vacuum. Replace
Clean or replace check valve.
leaking or worn seal or gasket.
bypass line if needed. See INSTAL
LATION.
sary.
leaking or worn seal or gasket.
TROUBLESHOOTING PAGE D - 1
Page 18
OM-06502
Pump Troubleshooting (Cont'd)
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PA SERIES
PUMP STOPS OR
FAILS TO DELIVER
RATED FLOW OR
PRESSURE (cont.)
PUMP REQUIRES
TOO MUCH
POWER
Strainer clogged.
Discharge check valve clogged.
Suction intake not submerged at
proper level or sump too small.
Impeller or other wearing parts worn
or damaged.
Discharge head too high.
Suction lift too high.
Pump speed too slow. Check driver output; consult driver
Belt or flexible coupling broken. Check and replace as necessary.
Pump speed too high. Check driver output; check that
Check strainer and clean if neces
sary.
Check and clean check valve.
Check installation and correct
submergence as needed.
Replace worn or damaged parts.
Check that impeller is properly
centered and rotates freely.
Free impeller of debris.Impeller clogged.
Install bypass line.
Measure lift w/vacuum gauge. Re
duce lift and/or friction losses in
suction line.
operation manual.
sheaves or couplings are correctly
sized.
PUMP CLOGS
FREQUENTLY
EXCESSIVE NOISE
Extreme ambient temperature. Reduce pump output.
Discharge head too low.
Bearing(s) frozen. Disassemble, check and replace
Discharge flow too slow.
Suction check valve or foot valve
clogged or binding.
Liquid solution too thick.
Cavitation in pump. Reduce suction lift and/or friction
Pumping entrained air.
Adjust discharge valve.
Dilute if possible.Liquid solution too thick.
bearing(s) as required..
Open discharge valve fully to in
crease flow rate, and run power
source at maximum speed.
Clean valve.
Dilute if possible.
losses in suction line. Record vac
uum and pressure gauge readings
and consult local representative or
factory.
Locate and eliminate source of air
bubble.
Secure mounting hardware.Pump or drive not securely mounted.
Impeller clogged or damaged.
Clean out debris; replace damaged
parts.
TROUBLESHOOTINGPAGE D - 2
Page 19
PA SERIES
Pump Troubleshooting (Cont'd)
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
OM-06502
BEARINGS RUN
TOO HOT
Bearing temperature is high, but
within limits.
Low or incorrect lubricant.
Suction and discharge lines not prop
erly supported.
Excessive tension on drive belt.
PUMP 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
Check bearing temperature regu
larly to monitor any increase.
Check for proper type and level of
lubricant.
Check piping installation for proper
support.
Align drive properly.Drive misaligned.
Check belt tension. Adjust as
required.
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.
TROUBLESHOOTING PAGE D - 3
Page 20
OM-06502
PA SERIES
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.
TROUBLESHOOTINGPAGE D - 4
Page 21
PA SERIES
OM-06525
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 PAV3A60C‐B
Based on 70F (21C) clear water at sea level
with minimum suction lift. Since pump installations
are seldom identical, your performance may be dif
ferent due to such factors as viscosity, specific
gravity, elevation, temperature, and impeller trim.
Contact the Gorman‐Rupp Company to verify per
formance or part numbers.
Pump speed and operating condition
If your pump serial number is followed by an “N”,
your pump is NOT a standard production model.
MAINTENANCE & REPAIR PAGE E - 1
points must be within the continuous per
formance range shown on the curve.
Page 22
OM-06525 PA SERIES
PARTS PAGE
ILLUSTRATION
SEE FIGURE 2
Figure 1. Pump Model PAV3A60C-B
MAINTENANCE & REPAIRPAGE E - 2
Page 23
PA SERIES
OM-06525
PARTS LIST
Pump Model PAV3A60C-B
(From S/N 1511107 Up)
If your pump serial number is followed by an “N”, your pump is NOT a standard production model. Contact
the Gorman‐Rupp Company to verify part numbers.
ITEM
PART NAME PART
NO.
NUMBER
MAT'L
CODE
QTY ITEM
NO.
PART NAME PART
NUMBER
MAT'L
CODE
QTY
1 PUMP CASING 38224-517 10000 1
2 REPAIR ROTATING ASSY 44163-534 --- 1
3 PIPE PLUG P12 15079 3
4 GASKET 25113-033 --- 2
5 LOCK WASHER 21171-514 --- 8
6 STUD MC1670 15991 4
7 SUCTION SPOOL 38642-013 10000 1
8 STRAINER SCREEN 38661-205 17040 1
9 HOPPER GASKET 38687-581 18000 1
10 LOCK WASHER 21171-511 --- 12
11 HEX HEAD CAP SCREW 22645-166 --- 4
12 HOPPER CAP 33282-033 15080 1
13 CLOSE PIPE NIPPLE T16 15079 1
14 PRIMING VALVE 26664-009 --- 1
15 SUCTION FLANGE 11412 10010 1
16 CHECK VALVE PIN 11557A 17010 1
17 BALL VALVE 26631-052 --- 1
18 FLAP VALVE ASSY 46411-060 --- 1
19 CONNECTOR S1598 --- 1
20 HOSE BARB FTG 26523-047 --- 1
21 SUCT FLANGE GASKET 11412G 19370 1
22 1/2” I.D. X 18” LG HOSE 18513-113 --- 1
23 DISCHARGE ELBOW 38647-641 10000 1
24 PIPE PLUG P04 15079 1
25 STUD 22641-023 --- 4
26 AIR COMPRESSOR ASSY 46181-908 --- 1
27 BELT 24186-011 --- 1
28 FAN GUARD 42381-510 2415X 1
29 SOCKET HD CAP SCREW 22644-215 --- 4
INDICATES PARTS RECOMMENDED FOR STOCK
30 HEX HEAD CAP SCREW 22645-168 --- 4
31 U‐BOLT 21751-019 --- 1
32 LOCK WASHER J04 15991 2
33 HEX NUT D04 15991 2
34 LOCK WASHER 21171-512 --- 4
35 HEX HEAD CAP SCREW 22644-224 --- 4
36 O‐RING S1874 --- 1
37 HEX NUT 22647-012 --- 8
38 PIPE PLUG P16 10009 1
39 STREET ELBOW RS08 11999 1
40 DRIVE SCREW BM#04-03 17000 4
41 NAMEPLATE 38818-155 13000 1
42 SPACER 31131-098 15000 4
43 SPROCKET 24271-118 --- 1
44 BUSHING 24131-211 --- 1
45 KEY N0404 15990 REF
46 COVER PLT ASSY 42111-344 --- 1
47 CLAMP BAR 38111-004 11010 1
48 MACHINE BOLT A1012 15991 2
49 HEX HD CAPSCREW B1010S 15991 1
50 FLANGE SUPPORT 34265-054 15080 1
51 SUCTION SUPPORT 34265-055 15080 1
52 G‐R DECAL GR-03 --- 1
53 DISCHARGE STICKER 6588BJ --- 1
54 SUCTION STICKER 6588AG --- 1
55 OIL LEVEL DECAL 38816-123 --- 1
56 LUBRICATION DECAL 38816-074 --- 1
57 GUARD WARNING DECAL 38816-063 --- 1
58 INSTRUCTION TAG 38817-085 --- 1
MAINTENANCE & REPAIR PAGE E - 3
Page 24
OM-06525 PA SERIES
ILLUSTRATION
Figure 2. Pump Model PAV3C60C-B (Cont'd)
MAINTENANCE & REPAIRPAGE E - 4
Page 25
PA SERIES
OM-06525
PARTS LIST
Pump Model Pump Model PAV3C60C-B (Cont'd)
(From S/N Up)
If your pump serial number is followed by an “N”, your pump is NOT a standard production model. Contact
the Gorman‐Rupp Company to verify part numbers.
ITEM
PART NAME PART
NO.
NUMBER
MAT'L
CODE
QTY ITEM
NO.
PART NAME PART
NUMBER
MAT'L
CODE
QTY
1 PUMP CASING 38224-517 10000 1
2 REPAIR ROTATING ASSY 44163-534 --- 1
3 PIPE PLUG P12 15079 3
4 GASKET 25113-033 --- 2
5 LOCK WASHER 21171-514 --- 8
6 STUD MC1670 15991 4
7 SUCTION SPOOL 38642-013 10000 1
8 STRAINER SCREEN 38661-205 17040 1
9 HOPPER GASKET 38687-581 18000 1
10 LOCK WASHER 21171-511 --- 12
11 HEX HEAD CAP SCREW 22645-166 --- 4
12 HOPPER CAP 33282-033 15080 1
13 CLOSE PIPE NIPPLE T16 15079 1
14 PRIMING VALVE 26664-009 --- 1
15 SUCTION FLANGE 11412 10010 1
16 CHECK VALVE PIN 11557A 17010 1
17 BALL VALVE 26631-052 --- 1
18 FLAP VALVE ASSY 46411-060 --- 1
19 CONNECTOR S1598 --- 1
20 HOSE BARB FTG 26523-047 --- 1
21 SUCT FLANGE GASKET 11412G 19370 1
22 1/2” I.D. X 18” LG HOSE 18513-113 --- 1
23 DISCHARGE ELBOW 38647-641 10000 1
24 PIPE PLUG P04 15079 1
25 STUD 22641-023 --- 4
26 AIR COMPRESSOR ASSY 46181-908 --- 1
27 BELT 24186-011 --- 1
28 FAN GUARD 42381-510 2415X 1
29 SOCKET HD CAP SCREW 22644-215 --- 4
INDICATES PARTS RECOMMENDED FOR STOCK
30 HEX HEAD CAP SCREW 22645-168 --- 4
31 U‐BOLT 21751-019 --- 1
32 LOCK WASHER J04 15991 2
33 HEX NUT D04 15991 2
34 LOCK WASHER 21171-512 --- 4
35 HEX HEAD CAP SCREW 22644-224 --- 4
36 O‐RING S1874 --- 1
37 HEX NUT 22647-012 --- 8
38 PIPE PLUG P16 10009 1
39 STREET ELBOW RS08 11999 1
40 DRIVE SCREW BM#04-03 17000 4
41 NAMEPLATE 38818-155 13000 1
42 SPACER 31131-098 15000 4
43 SPROCKET 24271-118 --- 1
44 BUSHING 24131-211 --- 1
45 KEY N0404 15990 REF
46 COVER PLT ASSY 42111-344 --- 1
47 CLAMP BAR 38111-004 11010 1
48 MACHINE BOLT A1012 15991 2
49 HEX HD CAPSCREW B1010S 15991 1
50 FLANGE SUPPORT 34265-054 15080 1
51 SUCTION SUPPORT 34265-055 15080 1
52 G‐R DECAL GR-03 --- 1
53 DISCHARGE STICKER 6588BJ --- 1
54 SUCTION STICKER 6588AG --- 1
55 OIL LEVEL DECAL 38816-123 --- 1
56 LUBRICATION DECAL 38816-074 --- 1
57 GUARD WARNING DECAL 38816-063 --- 1
58 INSTRUCTION TAG 38817-085 --- 1
MAINTENANCE & REPAIR PAGE E - 5
Page 26
OM-06525 PA SERIES
ILLUSTRATION
Figure 3. 44163-534 Repair Rotating Assembly
MAINTENANCE & REPAIRPAGE E - 6
Page 27
PA SERIES
OM-06525
PARTS LIST
44163-534 Repair Rotating Assembly
ITEM
NO.
1 BEARING HOUSING 38251-426 10000 1
2 BALL BEARING 23287-009 --- 1
3 IMPELLER SHAFT 38514-842 16000 1
4 SEAL PLATE 38272-425 11010 1
5 RETAINING RING S442 --- 1
6 OIL SEAL S1452 --- 1
6A OIL SEAL S1452 --- 1
7 LIP SEAL HOLDER 38242-709 11010 1
8 LOCK WASHER 21171-511 --- 16
9 GASKET 38683-480 18000 1
10 MOUNTING FLANGE 38545-014 10000 1
11 HEX HEAD CAP SCREW 22645-382 --- 8
12 SOCKET HEAD CAP SCREW 22644-216 --- 4
13 BEARING CAVITY SIGHT GAUGE S1471 --- 1
13A SEAL CAVITY SIGHT GAUGE S1471 --- 1
14 REDUCER PIPE BUSHING AP0802 15079 1
15 AIR VENT S1530 --- 1
16 PIPE PLUG P08 15079 1
16A BEARING CAVITY DRAIN PLUG P08 15079 1
16B SEAL CAVITY DRAIN PLUG P08 15079 1
17 VENTED PIPE PLUG 4823A 15079 1
18 PIPE PLUG P12 15079 2
19 CART SEAL ASSEMBLY 46513-151 --- 1
20 ADJ SHIM SET 2X 17090 REF
21 IMPELLER 38614-749 11010 1
22 FLAT HEAD CAP SCREW 22644-166 --- 2
23 IMPELLER WASHER 31514-016 17000 1
24 SOCKET HEAD CAP SCREW 22644-217 --- 1
25 O‐RING 25152-265 --- 1
26 GASKET 38687-582 18000 1
27 COVER 33659-062 15080 1
28 HEX HEAD CAP SCREW 22645-162 --- 4
29 O‐RING 25154-151 --- 1
30 O‐RING 25154-148 --- 1
31 KEY 24113-601 --- 1
32 STREET ELBOW RS12 11999 1
33 BALL BEARING S1080 --- 1
34 SHAFT KEY N0607 15990 1
35 SHAFT KEY N0607 15990 1
36 SHAFT SLEEVE O‐RING 25154-022 --- REF
37 SHIPPING PLUG 11495B 15079 2
38 O‐RING S1874 --- 1
39 OIL SEAL 25227-485 --- 1
NOT SHOWN:
PART NAME
INSTRUCTION TAG 6588U --- 1
PART
NUMBER
MAT'L
CODE
QTY
INDICATES PARTS RECOMMENDED FOR STOCK
MAINTENANCE & REPAIR PAGE E - 7
Page 28
OM-06525 PA SERIES
ILLUSTRATION
Figure 4. 46181-908 Air Compressor Assembly
MAINTENANCE & REPAIRPAGE E - 8
Page 29
PA SERIES
OM-06525
PARTS LIST
46181-908 Air Compressor Assembly
ITEM
NO.
1 AIR COMPRESSOR 26813-113 --- 1
2 PIPE PLUG P04 15079 1
3 STREET ELBOW RS04 11999 1
4 TUBE 31962-001 14090 1
5 COMPRESSION FITTING 26311-067 --- 1
6 PRESSURE RELIEF VALVE 26662-028 --- 1
7 HOSE BARB FITTING 26523-446 --- 1
8 CHECK VALVE 26641-092 --- 1
9 PIPE TEE U08 11999 1
10 PIPE COUPLING AE08 15079 1
11 REDUCER PIPE BUSHING AP0804 15079 1
12 VENTURI 26817-003 --- 1
13 ADAPTER HUB 31531-023 16000 1
14 KEY N0604 15990 1
15 SOCKET HEAD CAP SCREW 22644-211 --- 1
16 FAN 26813-951 --- 1
17 MACHINE SCREW X#10-01-1/2 15991 5
18 SPROCKET 24271-117 --- 1
19 BUSHING 24131-039 --- 1
20 HYD HOSE ADAPTER 26813-952 --- 1
INDICATES PARTS RECOMMENDED FOR STOCK
PART NAME
PART
NUMBER
MAT'L
CODE
QTY
MAINTENANCE & REPAIR PAGE E - 9
Page 30
PA SERIESOM-06525
PUMP AND SEAL DISASSEMBLY AND REASSEMBLY
Review all SAFETY information in Section A.
Follow the instructions on all tags, label and de
cals attached to the pump.
This pump requires little service due to its rugged,
minimum‐maintenance design. However, if it be
comes necessary to inspect or replace the wearing
parts, follow these instructions which are keyed to
the illustrations (see Figures 1 through 4) and the
corresponding Parts Lists. Maintenance and repair
instructions for the air compressor are covered
separately in specific literature available from the
manufacturer.
Before attempting to service the pump, lock out
and tag out incoming power to the control box and
take precautions to ensure that it will remain inop
erative. Close all valves in the suction and dis
charge lines and drain the pump casing by remov
ing the casing drain plug (3, Figure 1). Clean and
reinstall the drain plug.
pump integrity are compromised by
such practices.
Before attempting to open or service the
pump:
1. Familiarize yourself with this man
ual.
2. Disconnect or lock out the power
source to ensure that the pump will
remain inoperative.
3. Allow the pump to completely cool
if overheated.
4. Check the temperature and make
sure it is cool before opening any
covers, plates, gauges, or plugs.
5. Close the suction and discharge
valves.
6. Vent the pump slowly and cau
tiously.
7. Drain the pump.
This manual will alert personnel to
known procedures which require spe
cial attention, to those which could
damage equipment, and to those which
could be dangerous to personnel. How
ever, this manual cannot possibly antici
pate and provide detailed instructions
and precautions for every situation that
might occur during maintenance of the
unit. Therefore, it is the responsibility of
the owner/maintenance personnel to
ensure that only safe, established main
tenance procedures are used, and that
any procedures not addressed in this
manual are performed only after estab
lishing that neither personal safety nor
This pump may be equipped with an op
tional automatic starting system, and
therefore subject to automatic restart.
Keep hands and clothing away from the
unit to prevent injury during automatic
operation. Lock out the power from the
control box to ensure that the pump will
remain inoperative. Failure to do so
may result in serious personal injury.
Use only replacement parts provided or
approved by Gorman‐Rupp. Use of non‐
authorized parts may result in damage to
the equipment and/or injury to personnel
and will invalidate the warranty.
MAINTENANCE & REPAIRPAGE E - 10
Page 31
PA SERIES
OM-06525
Priming Valve Removal And Disassembly
(Figure 1)
Liquid within the priming hopper may be
pressurized. When draining liquid from the
priming hopper, use caution to avoid con
tact with the liquid. Otherwise, injury to ser
vice personnel may occur.
Disconnect the air discharge hose (22) from the
priming valve (14). Liquid will remain in the priming
valve. To drain the liquid, slowly remove the pipe
plug (not shown) in the valve body.
Gasket
Float
Arm
Orifice
Button
Figure 5. Priming Valve
If excessive liquid continues to bypass through the
priming valve after the pump is fully primed, the ori
fice button may require replacement. Remove the
old orifice button from the hole in float arm and
install a new one.
Cover
Float
Body
If draining is slow or difficult, the orifice in the valve
may be clogged (valve requires service).
Remove the hardware (10 and 11) and separate
the priming valve and hopper cap (12) from the
suction spool (7). Remove the gasket (9) and
strainer (8) from the suction spool and clean the
strainer as necessary.
It is not necessary to separate the priming valve
from the hopper cap unless complete replacement
of the priming valve is required. If replacement is
required, unscrew the priming valve from the nip
ple (13).
(Figure 5)
Remove the hardware securing the priming valve
cover to the priming valve body. Carefully lift the
valve cover and components from the priming
valve. Remove the priming valve gasket and clean
the mating surfaces.
Flap Valve Removal
(Figure 1)
Remove the discharge piping from the discharge
elbow (23).
Disengage the hardware (5 and 37) and remove
the discharge elbow (it may be necessary to tap on
the flange (15) with a soft‐faced mallet in order to
separate the discharge elbow from the flange).
With the discharge elbow removed, remove the
gasket (21). Unscrew the pin (16) from the flange.
Lift the flap valve assembly (18) out of the flange.
NOTE
Further disassembly of the flap valve is not required
since it must be replaced as a complete unit. Indi
vidual parts are not sold separately.
Remove the flange if the gasket (4) requires re
placement.
Pump Casing Removal
(Figures 1 and 2)
Support the pump casing using a suitable hoist
If the priming valve float is stuck, it can usually be
cleaned without further disassembly.
MAINTENANCE & REPAIR PAGE E - 11
and sling. Use caution to not to damage the pump
casing.
Page 32
Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam
age to equipment. If slings or chains are
used to move the pump or components,
make sure that the load is balanced;
otherwise serious personal injury or
death could result. Suction and dis
charge hoses and piping must be re
moved from the pump before lifting.
Disengage the hardware (34 and 35, Figure 2) se
curing the pump casing (1, Figure 1) to the rotating
assembly (2, Figure 2). Separate the pump casing
from the rotating assembly by pulling the casing
straight away. Use a soft‐faced mallet to tap on the
pump casing as necessary to separate the compo
nents. Remove and discard the O‐ring (36).
PA SERIESOM-06525
until the impeller comes free of the shaft. Retain the
impeller key (31).
Remove the impeller adjusting shims (20); tie and
tag the shims, or measure and record their thick
ness for ease of reassembly.
Seal Removal
(Figure 3)
Slide the integral shaft sleeve and rotating portion
of the seal off the shaft as a unit.
Use a pair of stiff wires with hooked ends to remove
the stationary element and seat.
An alternate method of removing the stationary
seal components is to remove the flat head caps
crews (22) and slide the seal plate off the shaft (3).
Remove the O‐ring (38) from the seal plate shoul
der.
Draining Oil From Seal Cavity
(Figure 3)
If any further disassembly is to be performed on the
pump, the seal oil cavity must be drained to pre
vent the oil in the seal cavity from escaping as the
impeller is removed.
Position a large, clean container under the seal
cavity drain plug (16B). Remove the plug and drain
the oil from the seal cavity into the container. For
shorter drain time, remove the vented plug (17).
Clean and reinstall the drain plug and vent plug. In
spect the oil for water, dirt or a cloudy condition
which could indicate seal failure.
Impeller Removal
(Figure 3)
Immobilize the impeller (21) with a strap wrench
and use an impact wrench to remove the impeller
screw and washer (23 and 24). Use caution not to
damage the impeller with the strap wrench.
Position two wedges opposite each other behind
the impeller, and tap the wedges carefully in turn
Position the seal plate on a flat surface with the im
peller side Use a wooden dowel or other suitable
tool to press on the back side of the stationary seat
until the seat, O‐rings, and stationary element can
be removed.
Remove the shaft sleeve O‐ring (36).
If no further disassembly is required, refer to Seal
Installation.
Removing Air Compressor Assembly
(Figure 2)
Further pump disassembly requires removal of the
air compressor assembly (26). Disengage the
hardware (10 and 29) and remove the guard (28).
Remove the hardware (10 and 30) and use a pry
bar to raise the air compressor high enough to re
move the spacers (42). Remove the belt (27) from
the air compressor drive pulley (18, Figure 4).
Disengage the hardware (32 and 33) and remove
the U‐bolt (31).
Disconnect all hoses and fittings from the air com
pressor and use a suitable hoist and sling to re
move the air compressor assembly.
MAINTENANCE & REPAIRPAGE E - 12
Page 33
PA SERIES
OM-06525
Separating Rotating Assembly From Driver
(Figures 1, 2 and 3)
The rotating assembly must be separated from the
driver before further disassembly.
Support the rotating assembly using a hoist and
sling. Disengage the coupling from the driver and
remove the coupling components and drive key
from the impeller shaft.
See Figure 2 and remove the air compressor drive
belt (27). Remove the hardware securing the drive
flange (10, Figure 3) to the flange support (50, Fig
ure 1) and move the rotating assembly to a clean,
well equipped shop area for further disassembly.
Loosen the setscrews in the bushing (44) and slide
the sprocket (43), bushing and key (45) off the
shaft.
Place a block of wood against the impeller end of
the shaft (3) and tap the shaft and assembled bear
ings (5 and 33) from the bearing housing.
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 compo
nent parts (except the bearings) with a soft cloth
soaked in cleaning solvent. Inspect the parts for
wear or damage and replace as necessary.
Shaft and Bearing Removal and Disassembly
(Figure 5)
When the pump is properly operated and main
tained, the bearing housing should not require dis
assembly. Disassemble the shaft and bearings
only when there is evidence of wear or damage.
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 bearing housing drain plug (16A) and
drain the lubricant. Clean and reinstall the drain
plug.
Disengage the hardware (8 and 11) and remove
the mounting flange (20), gasket (9) and oil seal
(6B). Press the oil seal from the mounting flange.
Disengage the hardware (8 and 12) and pull the lip
seal holder (7) out of the bearing housing (1). Re
move the O‐rings (29 and 30) from the shoulders
on the seal holder. Pry or press the oil seals (6 and
6A) from the seal holder.
Most cleaning solvents are toxic and
flammable. Use them only in a well ven
tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain
ers.
Clean the bearings thoroughly in fresh cleaning
solvent. Dry the bearings with filtered compressed
air and coat with light oil.
Bearings must be kept free of all dirt and
foreign material. Failure to do so will great
ly shorten bearing life. Do not spin dry
bearings. This may scratch the balls or
races and cause premature bearing fail
ure.
Rotate the bearings by hand to check for rough
ness or binding and inspect the bearing balls. If ro
tation is rough or the bearing balls are discolored,
replace the bearings.
The bearing tolerances provide a tight press fit
onto the shaft and a snug slip fit into the bearing
MAINTENANCE & REPAIR PAGE E - 13
Page 34
PA SERIESOM-06525
housing. Replace the bearings, shaft, or bearing
housing if the proper bearing fit is not achieved.
If bearing replacement is required, remove the
snap ring (5) and use a bearing puller to remove
the inboard and outboard bearings from the shaft.
Shaft and Bearing Reassembly and Installation
(Figure 5)
Inspect the shaft (29) for distortion, nicks or
scratches, or for thread damage on the impeller
end. Dress small nicks and burrs with a fine file or
emery cloth. Replace the shaft if defective.
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 bear
ings are removed.
The bearings may be heated to ease installation.
An induction heater, hot oil bath, electric oven, or
hot plate may be used to heat the bearings. Bear
ings should never be heated with a direct flame or
directly on a hot plate.
done quickly, in one continuous motion, to prevent
the bearings from cooling and sticking on the shaft.
After the bearings have been installed and allowed
to cool, check to ensure that they have not moved
away from the shaft shoulders in shrinking. If
movement has occurred, use a suitably sized
sleeve and a press to reposition the bearings
against the shaft shoulders.
If heating the bearings is not practical, use a suit
ably sized sleeve and an arbor (or hydraulic) press
to install the bearings on the shaft.
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.
Secure the outboard bearing to the shaft with the
snap ring (5)
When installing the shaft and bearings into
the bearing bore, push against the outer
race. Never hit the balls or ball cage.
Slide the shaft and assembled bearings into the
bearing housing until the retaining ring on the out
board bearing seats against the bearing housing.
NOTE
If a hot oil bath is used to heat the bearings, both the
oil and the container must be absolutely clean. If
the oil has been previously used, it must be thor
oughly filtered.
NOTE
Position the outboard bearing (35) on the shaft with
the retaining ring on the bearing O.D. toward the
drive end of the shaft.
Heat the bearings to a uniform temperature no
higher than 250F (120C) and slide the bearings
onto the shaft, one at a time, until they are fully
seated against the shaft shoulders. This should be
Apply a light coating of oil to the lip of the oil seal
(6B) and press it into the mounting flange (10) with
the lip positioned as shown in Figure 3. The face of
the oil seal should be flush with the chamfer on the
mounting flange bore.
Install the mounting flange gasket (9) and secure
the mounting flange to the bearing housing with
the hardware (8 and 11). Be careful not to damage
the lip of the oil seal on the shaft keyway. Torque the
capscrews (11) to 41 ft. lbs. (5,6 m. kg.).
Apply a light coating of oil to the lip of the oil seals (6
and 6A) and press them into the lip seal holder (7)
with the lips positioned as shown in Figure 3.
Slide the assembled lip seal holder and lip seals
over the shaft, using caution not to roll the lip of the
MAINTENANCE & REPAIRPAGE E - 14
Page 35
PA SERIES
OM-06525
inboard oil seal on the shaft shoulder. Secure the
lip seal holder to the bearing housing with the hard
ware (8 and 12).
Lubricate the bearings as indicated in LUBRICA
TION at the end of this section.
Securing Rotating Assembly to Driver
(Figures 1, 2 and 3)
See Figure 3 and install the key (34) in the shaft
keyway, making sure to leave room in the keyway
for the drive key (35). Install the sprocket (43, Fig
ure 2) and bushing (44, Figure 2) on the shaft to the
dimension shown in Figure 6.
(25, Figure 3). Slide the belt (27) over the air com
pressor sprocket (43). Use a pry bar to raise the
compressor high enough to install the spacers (42)
between the compressor and the mounting flange.
Secure the compressor to the mounting flange
with the hardware (10 and 30).
Reinstall the U‐bolt and hardware (31, 32 and 33).
Install the coupling guard (28) and secure it with
the previously removed hardware (10 and 29).
Seal and Impeller Installation
(Figures 3, 7, 8 and 9)
Figure 6. Drive Sprocket Positioning
Secure the bushing and sprocket to the shaft by
torqueing the bushing screws to (55 in. lbs. or 6,3
m. kg.). Install the belt (27) over the sprocket and
up through the slot in the mounting flange (25, Fig
ure 3).
Install the drive key (35, Figure 3) in the shaft key
way.
Using a suitable lifting device, position the rotating
assembly on the base and secure the flange to the
support (50, Figure 1) with the previously removed
hardware. Reinstall and align the coupling.
Installing Air Compressor Assembly
Most cleaning solvents are toxic and
flammable. Use them only in a well ven
tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain
ers.
Clean the seal cavity and shaft with a cloth soaked
in fresh cleaning solvent. Inspect the stationary
seat bore in the seal plate for dirt, nicks and burrs,
and remove any that exist. The stationary seat bore
must be completely clean before installing the
seal.
A new seal assembly should be installed
any time the old seal is removed from the
pump. Wear patterns on the finished faces
cannot be realigned during reassembly.
Reusing an old seal could result in prema
ture failure.
(Figure 2)
Use a suitable hoist and sling to position the air
compressor assembly (26) on the mounting flange
MAINTENANCE & REPAIR PAGE E - 15
To ease installation of the seal, lubricate the shaft
sleeve O‐ring and the external stationary seat O‐
ring with a very small amount of light lubricating oil.
See Figure 7 for seal part identification.
Page 36
PA SERIESOM-06525
SPRING
IMPELLER
IMPELLER
SHIMS
IMPELLER
SHAFT
BELLOWS
SPRING
CENTERING
WASHER
RETAINER
ROTATING
ELEMENT
STATIONARY
ELEMENT
SEAL PLATE
O‐RINGS
SLEEVE
O‐RING
INTEGRAL
SHAFT
SLEEVE
SHEAR
RING
(SHEARED)
STATIONARY
SEAT
Figure 7. Cartridge Seal Assembly
This seal is not designed for operation at
temperatures above 160F (71C). Do not
use at higher operating temperatures.
If the seal plate (4) was removed, install the seal
plate O‐ring (25) and lubricate it with oil. Position
the seal plate over the shaft and secure it to the
bearing housing with the flat head capscrews (22).
To prevent damaging the shaft sleeve O‐ring (36)
on the shaft threads, cover the threads with electri
cal or duct tape. Slide the O‐ring over the shaft until
it seats against the shaft shoulder. Remove the
tape covering the threads. Check to ensure that
the shaft threads are free of any tape residue and
clean as required before proceeding with seal
installation.
Lubricate the external stationary seat O‐ring with
light oil. Slide the seal assembly onto the shaft until
the external stationary seat O‐ring engages the
bore in the seal plate.
Inspect the impeller, and replace it if cracked or
badly worn. Inspect the impeller screw (24) and
shaft threads for dirt or damage, and clean or dress
the threads as required.
Install the set of impeller shims (20) provided with
the seal and install the impeller key (31) in the shaft
keyway. Position the impeller keyway over the im
peller key and press the impeller onto the shaft until
it is seated against the seal (see Figure 8).
MAINTENANCE & REPAIRPAGE E - 16
Page 37
PA SERIES
OM-06525
O‐RING ENGAGED
WITH SEAL PLATE
BORE
SHEAR RING
(UNSHEARED)
Figure 8. Seal Partially Installed
Immobilize the impeller shaft by wedging a block of
wood between one of the impeller vanes and the
ground.
STATIONARY SEAT
FULLY SEATED IN
SEAL PLATE BORE
SHEAR RING
(SHEARED)
Figure 9. Seal Fully Installed
A clearance of .025 to .040 inch (0,64 to 1,02 mm)
between the impeller and the seal plate is recom
mended for maximum pump efficiency. Measure
this clearance and add or remove impeller adjust
ing shims as required.
Torque the impeller screw to 90 ft. lbs. (12,4 m.
kg.).
Install the impeller washer (23). Apply a small
amount of `Never‐Seez' or equivalent anti‐lock
compound on the threads of the impeller screw
(23) and use the impeller screw to press the impel
ler onto the shaft. This action will press the station
ary seat into the seal plate bore.
NOTE
A firm resistance will be felt as the impeller presses
the stationary seat into the seal plate bore.
As the stationary seat becomes fully seated, the
seal spring compresses, and the shaft sleeve will
break the nylon shear ring. This allows the sleeve
to slide down the shaft until seated against the
shaft shoulder. Continue to use the impeller screw
to press the impeller onto the shaft until the impel
ler, shims and sleeve are fully seated against the
shaft shoulder (see Figure 9).
Remove the wood block used to prevent shaft rota
tion.
If necessary to reuse an old seal in an emer
gency, carefully separate the rotating and station
ary seal faces from the bellows retainer and sta
tionary seat.
A new seal assembly should be installed
any time the old seal is removed from the
pump. Wear patterns on the finished faces
cannot be realigned during reassembly.
Reusing an old seal could result in prema
ture failure.
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.
Carefully wash all metallic parts in fresh cleaning
solvent and allow to dry thoroughly.
MAINTENANCE & REPAIR PAGE E - 17
Page 38
Flap Valve Installation
(Figure 1)
PA SERIESOM-06525
Do not attempt to separate the rotating
portion of the seal from the shaft sleeve
when reusing an old seal. The rubber bel
lows will adhere to the sleeve during use,
and attempting to separate them could
damage the bellows.
Inspect the seal components for wear, scoring,
grooves, and other damage that might cause leak
age. Inspect the integral shaft sleeve for nicks or
cuts on either end. If any components are worn, or
the sleeve is damaged, replace the complete seal;
never mix old and new seal parts.
Install the stationary seal element in the stationary
seat. Press this stationary subassembly into the
seal plate bore until it seats squarely against the
bore shoulder. A push tube made from a piece of
plastic pipe would aid this installation. The I.D. of
the pipe should be slightly larger than the O.D. of
the shaft sleeve.
Slide the rotating portion of the seal (consisting of
the integral shaft sleeve, spring centering washer,
spring, bellows and retainer, and rotating element)
onto the shaft until the seal faces contact.
Install the impeller as previously described, then
proceed with Pump Casing Installation.
Pump Casing Installation
(Figures 1 and 2)
Inspect the flap valve assembly (18) and replace it
if badly worn.
NOTE
The flap valve assembly must be replaced as a
complete unit. Individual parts are not sold sepa
rately.
If the gasket (4) was removed, clean the mating
surfaces of the casing (1) and flange (15). Install
the new gasket and the flange against the pump
casing.
Position the flap valve adaptor in the mounting slot
in the flange and secure the assembly with the
check valve pin (16).
Install a new flange gasket (21). Apply “Loctite No.
242 Threadlocker” or equivalent compound on the
threads of the the studs (25) in the discharge el
bow. Lower the discharge elbow over the flange
and pump casing and slide the studs down
through the holes. Secure the parts with the hard
ware (5 and 37).
Priming Valve Reassembly And Installation
(Figures 1 and 5)
Clean and inspect the components of the priming
valve. Inspect the linkage and ensure the orifice
button squarely engages the valve seat. Replace
the orifice button if required (see Priming Valve
Removal and Disassembly for orifice button re
moval).
Lubricate the O‐ring (36, Figure 2) with light grease
and install it over the shoulder on the seal plate (4,
Figure 3). Use a suitable lifting device to position
the pump casing against the seal plate. Be careful
not to damage the O‐ring.
Secure the pump casing to the rotating assembly
with the hardware (34 and 35, Figure 1).
See Figurre 1. If the suction spool (7) was removed,
replace the gasket (4) and position the spool
against the pump casing. Secure the spool to the
pump casing and suction support (51) with the
hardware (3 and 57).
Gorman‐Rupp provides replacement parts for the
cover gasket and the orifice button. If any of the
other priming valve components are worn or dam
aged, they must be replaced before reinstalling the
priming valve. For additional parts and service in
structions for the valve, Contact the Val‐Matic
Valve and Manufacturing Corporation, or go to
www.valmatic.com on the World Wide Web. Ref
erence Val‐Matic Model Number 25.5.
After servicing the priming valve components, rein
stall the priming valve cover gasket and secure the
cover to the valve body with the previously re
moved hardware.
MAINTENANCE & REPAIRPAGE E - 18
Page 39
PA SERIES
OM-06525
If the complete priming valve is being replaced,
screw the replacement valve onto the nipple (13) in
the priming hopper cap (12).
Clean the strainer screen (8) and install it in the
suction spool. Install the priming hopper gasket (9)
and secure the priming valve and priming hopper
cap to the suction spool with the previously remove
hardware (10 and 11).
Reconnect the air discharge tubing to the priming
chamber assembly.
LUBRICATION
(Figure 3)
Seal Assembly
Before starting the pump, remove the vented plug
(17) and fill the seal cavity with approximately 36
ounces (1 liter) of SAE No. 30 non‐detergent oil or
to the center of the sight gauge (13A). Clean and
reinstall the vented plug. Maintain the oil level at the
middle of the sight gauge.
larly through the sight gauge (13)
the midpoint of the gauge. When lubrication is re
quired, remove the pipe plug (18) from the elbow
(32) and add SAE No. 30 non‐detergent oil through
the opening. When lubricating a dry (overhauled)
bearing housing, fill the bearing cavity with approx
imately 15 ounces (0,44 liter) of oil, or to the middle
of the sight gaute (13). Clean and reinstall the pipe
plug. Do not over‐lubricate the bearing housing.
Over‐lubrication can cause the bearings to over‐
heat, resulting in premature bearing failure.
and maintain it at
NOTE
The white reflector in the sight gauge must be posi
tioned horizontally to provide proper drainage.
Under normal conditions, drain the bearing hous
ing once each year and refill with clean oil. Change
the oil more frequently if the pump is operated con
tinuously or installed in an environment with rapid
temperature change.
NOTE
The white reflector in the sight gauge must be posi
tioned horizontally to provide proper drainage.
Bearings
(Figure 3)
The bearing housing was fully lubricated when
shipped from the factory. Check the oil level regu
Monitor the condition of the bearing lubri
cant regularly for evidence of rust or mois
ture condensation. This is especially im
portant in areas where variable hot and
cold temperatures are common.
For cold weather operation, consult the factory or a
lubricant supplier for the recommended grade of
oil.
MAINTENANCE & REPAIR PAGE E - 19
Page 40
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 MANSFIELD, OHIO
GORMAN‐RUPP OF CANADA LIMITED ST. THOMAS, ONTARIO, CANADA
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