GORMAN-RUPP PUMPS PA Series Manual

OM-06531-02
April 20, 2020
GORMAN‐RUPP PUMPS
www.grpumps.com
2020 Gorman‐Rupp Pumps Printed in U.S.A.
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
WITH PARTS LIST
PA SERIES PUMPS
MODELS
PA6C60C‐B‐E50 460/575/3
PA6C60C-B-(E50)

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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:

TABLE OF CONTENTS
i
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.......................................................

TABLE OF CONTENTS
(continued)
ii
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...................................................
Pump End Assembly PAGE E - 7...................................................
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................................
Draining Oil From Seal Cavity PAGE C - 15............................................
Separating Pump And Drive Assembly From Engine PAGE C - 15........................
Loosening Impeller PAGE C - 15.....................................................
Pump Casing Removal PAGE C - 16.................................................
Impeller Removal PAGE C - 16......................................................
Seal Removal PAGE C - 17..........................................................
Shaft and Bearing Removal and Disassembly PAGE C - 17.............................
Shaft and Bearing Reassembly and Installation PAGE C - 17............................
Seal Reassembly and Installation PAGE C - 19........................................
Impeller Installation And Adjustment PAGE C - 21......................................
Pump Casing Installation PAGE C - 21................................................
Securing Pump End To Power Source PAGE C - 21....................................
Wear Plate and Back Cover Installation And Adjustment PAGE C - 22....................
Discharge Check Valve Reassembly And Installation PAGE C - 23.......................
Priming Chamber Assembly And Installation PAGE C - 23...............................
LUBRICATION PAGE C - 23.............................................................
Seal Assembly PAGE C - 23.........................................................
Bearings PAGE C - 24..............................................................

OM-06531PA SERIES
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.
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.
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
which are not covered in this manual or in other lit
erature accompanying the 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.
The following are used to alert personnel to proce
dures which require special attention, to those
which could damage equipment, and to those
which could be dangerous to personnel:
Immediate hazards which WILL result in
severe personal injury or death. These
instructions describe the procedure 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 de
scribe the requirements and the possible
damage which could result from failure to
follow the procedure.
NOTE
Instructions to aid in installation, operation, and
maintenance or which clarify a procedure.

PA SERIES OM-06531
PAGE A - 1SAFETY
SAFETY ‐ SECTION A
This information applies to Prime Airr
Series pumps. Refer to the manual ac
companying the power source before
attempting to begin operation.
This manual will alert personnel to
known procedures which require spe
cial attention, to those which could
damage equipment, and to those which
could be dangerous to personnel. How
ever, this manual cannot possibly antici
pate and provide detailed instructions
and precautions for every situation that
might occur during maintenance of the
unit. Therefore, it is the responsibility of
the owner/maintenance personnel to
ensure that only safe, established main
tenance procedures are used, and that
any procedures not addressed in this
manual are performed only after estab
lishing that neither personal safety nor
pump integrity are compromised by
such practices.
Before attempting to install, operate, or
wire the pump control box, familiarize
yourself with this manual, and with all
other literature shipped with the control
box. Unfamiliarity with all aspects of
control operation covered in this manu
al could lead to destruction of equip
ment, injury, or death to personnel.
Before connecting any cable to the con
trol box, be sure to ground the control
box. See Section B for suggested
grounding methods.
The control box provides overload pro
tection and power control. Do not con
nect the pump motor directly to the in
coming power lines. If the power circuit
breaker or overload relay is tripped dur
ing operation, correct the problem be
fore resetting or replacing.
The electrical power used to operate the
pump control box is high enough to
cause injury or death. Obtain the ser
vices of a qualified electrician to make
all electrical connections. Make certain
that the enclosure is properly
grounded; never use gas pipe as an
electrical ground. Be sure that the in
coming power matches the voltage and
phase of the control before connecting
the power source. Do not make electri
cal connections if the voltage is not
within the limits. If the overload unit is
tripped during operation, correct the
problem before restarting.
The electrical power used to operate the
pump control box is high enough to
cause injury or death. Make certain that
the control handle on the control box is
in the OFF position and locked out be
fore attempting to service the pump. Be
fore attempting to open or service the
control box, disconnect and/or lock out
the power supply to the control box. Tag
electrical circuits to prevent accidental
start‐up.

PA SERIESOM-06531
PAGE A - 2 SAFETY
Obtain the services of a qualified elec
trician to troubleshoot, test and/or ser
vice the electrical components of the
control box.
Before attempting to open or service the
pump:
1. Familiarize yourself with this man
ual.
2. Turn the control box selector
switch to `OFF' and lock it out to en
sure that the pump will remain in
operative.
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 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.
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.
This pump is designed to handle most
non‐volatile, non‐flammable liquids
containing specified entrained solids.
Do not attempt to pump volatile, corro
sive, or flammable liquids which may
damage the pump or endanger person
nel as a result of pump failure.
Death or serious personal injury and
damage to the pump or components
can occur if proper lifting procedures
are not observed. Make certain that
hoists, chains, slings or cables are in
good working condition and of suffi
cient capacity and that they are posi
tioned so that loads will be balanced
and the pump or components will not be
damaged when lifting. Suction and dis
charge hoses and piping must be re
moved from the pump before lifting. Lift
the pump or component only as high as
necessary and keep personnel away
from suspended objects.
After the pump has been installed, make
certain that the pump and all piping or
hose connections are tight, properly
supported and secure before operation.
Do not operate the pump against a
closed discharge valve. If operated
against a closed discharge valve, pump
components will deteriorate, and the
liquid could come to a boil, build pres
sure, and cause the pump casing to rup

PA SERIES OM-06531
PAGE A - 3SAFETY
ture or explode. Momentary closure of a
discharge valve is acceptable only
when required for startup or shutdown
procedures.
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 completely before
servicing.
Do not operate the pump without guards
in place over the rotating parts. Ex
posed rotating parts can catch clothing,
fingers or tools, causing severe injury to
personnel.
Pumps and related equipment must be in
stalled and operated according to all na
tional, local and industry standards.
Make sure the pump is level. Lower jack
stands and chock the wheels, if so
equipped.

PA SERIES OM-06531
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 positioned
above the free level of liquid to be pumped.
If installed in a flooded suction application where
the liquid is supplied to the pump under pressure,
some of the information such as mounting, line
configuration, and priming must be tailored to the
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.
OUTLINE DRAWING
6.00 ANSI
BLIND FLANGE
(ALTERNATE SUC
TION)
SUCTION:
6.00 NOMINAL WITH 8 HOLES
TAPPED .750-10 UNC-2B X .88/[22,4] DEEP
EQUALLY SPACED ON A 9.50/[241,3] DIA BC
DISCHARGE:
6.00 NOMINAL WITH 8 HOLES
.88/[22,4] DIA EQUALLY SPACED
ON A 9.50/[241,3] DIA BC
12.00/[304,8] X 4.00/[101,6]
OPENING THRU
2 PLACES
POWERED BY: 50 HP, 1800 RPM, 326T FRAME MOTOR
.81/[20,6] DIA
4 HOLES
DIMENSIONS:
INCHES
[MILLIMETERS]
20.75
[ 527,1 ]
10.00
[ 254,0 ]
19.12
[ 485,8 ]
23.50
[ 596,9 ]
48.41
[ 1229,6 ]
BASE
L
C
47.00
[ 1193,8 ]
93.12
[ 2365,4 ]
32.00
[ 812,8 ]
30.56
[ 776,3 ]
10.22
[ 259,6 ]
14.00
[ 355,7 ]
55.69
[ 1414,5 ]
14.25
[ 362,0 ]
22.54
[ 572,5 ]
64.62
[ 1641,3 ]
Figure 1. Pump Model PA6C60C-B-E50 460/575/3

OM-06531 PA SERIES
PAGE B - 2 INSTALLATION
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. Compare the amperes, phase, voltage and
hertz indicated on the pump motor nameplate
to the ratings indicated for the control box.
d. Carefully read all tags, decals, and markings
on the pump assembly, and perform all duties
indicated. Note that the pump shaft rotates in
the required direction.
Only operate this pump in the direction in
dicated by the arrow on the pump body
and on the accompanying decal. Other
wise, the impeller could become loosened
from the shaft and seriously damage the
pump.
e. Check levels and lubricate as necessary. Re
fer to LUBRICATION in the Maintenance and
Repair Manual and perform duties as in
structed.
f. 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.
The pump assembly can be seriously
damaged if the chains or cables used to lift
and move the unit are improperly wrapped
around the pump.
Mounting
Locate the pump in an accessible place as close as
practical to the liquid being pumped. Level 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.

PA SERIES OM-06531
PAGE B - 3INSTALLATION
If the pump has been mounted on a
movable base, do not attempt to operate
the pump unless the unit is level. Be
sure the leveling stands are positioned
on a solid surface, and the wheels are
chocked.
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.
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
The pump is drilled and tapped for installing dis
charge pressure and vacuum suction gauges. It is
recommended that gauges be installed to monitor
pump performance. Seal the gauge threads with
pipe dope to ensure an airtight seal. Follow the
sealant manufacturer's recommendations when
selecting and applying the pipe dope. The pipe
dope should be compatible with the liquid being
pumped.
SUCTION LINES
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
Be certain to use the strainer furnished with the
pump; any spherical solids which pass through the
strainer will also pass through the pump itself.
If a strainer not furnished with the pump 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.

OM-06531 PA SERIES
PAGE B - 4 INSTALLATION
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 2
shows recommended minimum submergence vs.
velocity.
Although not recommended, the vacuum assisted
priming feature allows the pump to be operated
temporarily in a “slurping” application with varying
water levels.
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).

PA SERIES OM-06531
PAGE B - 5INSTALLATION
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.
Valves
This pump is designed with a check valve in the
discharge line.
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 be installed in the discharge line
to protect the pump from excessive shock pres
sure and reverse rotation when it is stopped.
If the application involves a high discharge
head, gradually close the discharge
throttling valve before stopping the pump.
ELECTRICAL CONNECTIONS
Obtain the services of a qualified elec
trician to make all electrical connec
tions and to service the control box.
The electrical power used in this control
box is high enough to cause injury or
death. Make certain that the control box
is properly grounded after installation.
Make certain that the power source
phase and voltage matches the data on

OM-06531 PA SERIES
PAGE B - 6 INSTALLATION
the control box. Complete all electrical
connections before connecting the
power supply to the control box. Make
certain to ground the appropriate lead
of the power source before connecting
power to the control. Make certain that
the control box is properly grounded af
ter installation.
Grounding Methods
Electrically ground the installation before connect
ing the field wiring to the control box. Install a
grounding terminal to the enclosure and connect it
to a properly embedded electrode.
The material used for the electrode must be an ex
cellent conductor of electricity, such as copper. If
iron or steel is used, it must be galvanized or other
wise metal plated to resist corrosion. Do not coat
the electrode with any material of poor conductiv
ity, such as paint or plastic.
The electrode must conform to the recommenda
tions of N.E.C. ARTICLE 250. Follow all installation
requirements of the N.E.C., and all applicable
codes. See Figure 3 for some suggested ground
ing methods.
ROCK
8 FEET
(2,4 M)
3/4 INCH (19,1
MM) NOMINAL
DIAMETER
(MINIMUM)
SOIL
SOIL
SOIL
1/4 INCH STEEL
PLATE 2 SQ. FEET
(1858,1 SQ. CM)
SURFACE AREA
(MINIMUM)
a) PLATE ELECTRODE b) DRIVEN ELECTRODE c) BURIED ELECTRODE
3/4 INCH (19,1 MM)
NOMINAL DIAMETER
(MINIMUM) 8 FEET
(2,4 M) LONG
Figure 3. Suggested Grounding Methods
a. Plate Electrode: An iron or steel plate, 1/4
inch (6,4 mm) thick, completely impeded in
the ground. The plate must present a surface
area of at least 2 square feet (1858,1 sq. cm).
b. Driven Electrode: A rod or pipe, 3/4 inch
(19,1 mm) in diameter minimum, 8 feet (2,4 m)
long, completely driven into the ground.
c. Buried electrode: If rock or stone prevents
embedding the full 8 foot (2,4 m) length of the
ground rod, bury it horizontally in a trench.
Space the ground rod or plates at least 6 feet
(1,8 m) from any other electrode or ground
rod, such as those used for signal circuits, ra
dio grounds, lightning rods, etc.
The earth surrounding the ground rod or plate
must contain enough moisture to make a
good electrical connection. In dry or sandy ar
eas, pour water around the rod, or consult
qualified personnel to devise a method of im
proving the connection.
Field Wiring Connections (Incoming Power)
The electrical power used to operate
this pump is high enough to cause inju
ry or death. Obtain the services of a qu
alified electrician to make all electrical
connections. Make certain that the
pump and enclosure are properly
grounded; never use gas pipe as an
electrical ground. Be sure that the in
coming power matches the voltage and
phase of the pump and control before
connecting the power source. Do not
run the pump if the voltage is not within
the limits.
The control is designed to regulate the power sup
ply. The field wiring must be properly sized to en
sure an adequate voltage supply. The voltage

PA SERIES OM-06531
PAGE B - 7INSTALLATION
available at the pump motor must be within the in
dicated range.
Table 1. Pump Motor Voltage Limits
Nominal
Voltage
Minimum
Voltage
Maximum
Voltage
Phase
460 3 414 506
575 3 517 632
If the voltage is not within the recommended limits,
obtain the services of a qualified electrician to de
termine the correct field wiring size and other de
tails to ensure an adequate voltage supply.
Make certain all connections are tight and that ca
ble entry points are rainproof. Support the cable
weight, if required, to prevent excessive strain on
cable clamps and cable.
NOTE
After the power cables have been connected to the
control box, make certain the connection is water
proof.
Voltage Imbalance
Each phase of the incoming three‐phase power
must be balanced with the other two as accurately
as a commercial voltmeter will read. If the phases
are out of balance, contact your power company
and request that they correct the condition.
Power Cable Connections
The electrical power used to operate the
control box is high enough to cause in
jury or death. Obtain the services of a
qualified electrician to make all electri
cal connections. Make certain that in
coming power to the control box is in the
off position and locked out, or that the
power supply to the control box has
been otherwise cut off and locked out,
before connecting power or accessory
cables.
When necessary to change or connect power
cables to the control box, make certain the incom
ing power is OFF and LOCKED OUT. Make certain
the control box is properly grounded and that the
electrical data on the control matches the pump
motor name plate data.
Connect the power cable to the control box as
shown in the wiring diagrams in this section or in
side the control box door. Use conduit or cable
clamps to secure the power and accessory cables
to the control box. Make certain that all connec
tions are tight and that cable entry points are
rainproof.
Control Box Adjustments
For control adjustments and settings, refer to the
information inside the control box door.
To maintain overcurrent, short circuit
and ground fault protection, the man
ufacturer's instructions for selection of
the heater pack and setting of the in
stantaneous trip circuit breaker (current
interrupter) or control interface module
must be followed. Failure to follow these
instructions can result in damage to the
pump and/or serious injury to person
nel.
ALIGNMENT
The alignment of the pump and motor is critical for
trouble‐free mechanical operation. In a flexible
coupling 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 in
stalled, and before operation.
NOTE
Check Rotation, Section C, before final alignment
of the pump.
When mounted at the Gorman‐Rupp factory, driver
and pump are aligned before shipment. Misalign
ment will occur in transit and handling. Pumps
must be checked and realigned before operation.

OM-06531 PA SERIES
PAGE B - 8 INSTALLATION
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.
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.
AUTO‐START
The pump may be equipped with an optional auto‐
start control system which allows the pump to start
and stop as the liquid level in the wet well or sump
rises and falls.
Refer to the information which follows for installa
tion details for the optional liquid level sensing sys
tem.
Float Switch Installation
The Float Switch autostart system employs either a
single or double float switch, where a bulb raises or
lowers (floats) with the liquid level, thus activating
an enclosed miniature switch. The floats are
equipped with a socket type connector that plugs
into a matching receptacle on the auto‐start control
box.
Standard floats are equipped with 50 feet (15,2 m)
of cable.
When installing the floats, note the following:
a. Be sure to provide sufficient room in the wet
well or sump so that floats do not get ob
structed or drawn into the suction line. If a flex
ible suction hose is used, it may be extended
to lay along the bottom of the wet well or sump
and the float can be attached to the hose
above the point where it bends along the bot
tom. Direct the suction line toward the flow,
and the float(s) away from the flow. If a stand
pipe is available, attach the float switch cable
to the standpipe in the sump at the approxi
mate desired liquid level.
b. In a single float system, the cable can be teth
ered to the suction line or standpipe approxi
mately 6 inches (152 mm) above the float.
This setting allows approximately 9 inches
(229 mm) of liquid rise between pump start/
stop. The start/stop interval may be increased
by extending the float end of the cable. The
liquid level in the sump will increase approxi
mately 8 inches (203 mm) between start/stop
intervals for every 6 inches (152 mm) of cable
increase.
c. If a double float switch system is used, posi
tion the “Start” float at the desired high water
level in the sump, and the “Stop” float at the
desired low water level in the pump.
d. Refer to Figure 4 for additional float switch
data.

PA SERIES OM-06531
PAGE B - 9INSTALLATION
OPERATING
RANGE
(See Table Below)
CABLE
TETHER
POINT
OFF
(Emptying)
ON
(Filling)
ON
(Emptying)
OFF
(Filling)
1.25” Pipe
(Not Furnished)
PUMP
CONTROL
BOX
1.0
(0.3)
APPROXIMATE FREE CORD LENGTH IN FT. (M)
0.5
(.15)
1.0
(0.3)
1.5
(.46)
2.0
(0.6)
2.5
(.76)
3.0
(0.9)
2.0
(0.6)
3.0
(0.9)
4.0
(1.2)
Figure 4. Float Switch Data
Submersible Transducer Installation
The Electronic Pressure Switch (EPS) autostart
system employs a submersible transducer level
sensor with 75 feet (22,9 m) of signal cable con
nected to the EPS.
The transducer sensor converts pressure to an
electrical signal proportional to liquid level. This
electrical signal is distributed to the digital display
on the EPS through a scaling circuit which con
verts the electrical signal to “feet of water”.
When installing the transducer sensor, note the fol
lowing:
a. Handle the signal cable and transducer sen
sor with care during installation. Carefully
lower the sensor into the wet well or sump; do
not drop it to the bottom. To avoid clogging,
suspend the sensor off the bottom.
b. Be sure to provide sufficient room in the wet
well or sump so that the sensor does not get
drawn into the suction line. To prevent this, a
flexible suction hose may be extended to lay
along the bottom of the wet well or sump. The
sensor can then be attached to the hose
above the point where it bends along the bot
tom. See Figure 5 for a typical installation.
c. Allow slack in the signal cable so that the sen
sor weight does not pull on the connection.
d. The wet well or sump must be vented to atmo
sphere.
e. The EPS is scaled in feet of water column. If
the measured medium is other than 1.0 spe
cific gravity, the reading on the EPS should be
divided by the specific gravity of the mea
sured medium to obtain the actual level.
f. Thoroughly clean the sensor after each use
to prevent clogging.
Do not disassemble the transducer sensor
or loosen the compression nut at the signal
cable entry. This will void warranty. There
are no user‐serviceable parts inside. Do
not nick or cut the jacket of the signal
cable; this will cause leakage and void
warranty. Connect the signal cable only to
the EPS terminals for this purpose and to
no other power source.

OM-06531 PA SERIES
PAGE B - 10 INSTALLATION
FLOW
DISCHARGE
LINE
SUCTION
LINE
SIGNAL CABLE
(ATTACH TO
SUCTION LINE)
SUBMERSIBLE
TRANSDUCER
(DOWNSTREAM
FROM SUCTION)
SUCTION
STRAINER
Figure 5. Typical Submersible Transducer AutoStart Pump Installation

PA SERIES OM-06531
PAGE B - 11INSTALLATION
Transducer Connections
The submersible transducer sensor cable is facto
ry‐equipped with a female connector which mates
with a male connector on the back of the EPS con
trol. If removal or replacement of the female con
nector is required, reconnect the cable to the con
nector as shown in Figure 6.
Once the connections are made, simply plug the
female connector into the male connector on the
back of the EPS, and refer to Section C for opera
tional procedures.
SHD -V +VSIG
+ BATT
-BATT
SHIELD
-
MOTOR
RUN
+
+ TEMP
RELAY
A
RELAY
B
HORN
RELAY
TRANSDUCER
CAUTION-
THIS COVER PLATE MUST
BE INSTALLED FOR PROPER
CONTROL OPERATION
MALE
TRANSDUCER
CONNECTOR
FEMALE
TRANSDUCER
CONNECTOR
TRANSDUCER
SENSOR
CABLE
RED
WHITE
BLACK
SHIELD
Figure 6. Back Side of Transducer Showing Sensor Cable Connections

OM-06531
PA 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.
The electrical power used to operate
this control box is high enough to cause
injury or death. Make certain that the
control handle on the control box is in
the OFF position and locked out, or that
the power supply to the control box has
been otherwise cut off and locked out,
before attempting to open or service the
control box. Tag electrical circuits to
prevent accidental start‐up.
Obtain the services of a qualified elec
trician to make all electrical connec
tions, and to troubleshoot, test and/or
service the electrical components of the
control box.
This pump is designed to handle most
non‐volatile, non‐flammable liquids
containing specified entrained solids
and corrosives. Do not attempt to pump
volatile, corrosive, or flammable liquids
which may damage the pump or endan
ger personnel as a result of pump fail
ure.
Pump operating condition points must be
within the continuous performance range
shown on the Performance Curve in Sec
tion E.
STARTING AND OPERATION
Control Box Function
The control box provides overload pro
tection and power control. Do not con
nect the pump motor directly to the in
coming power lines.
The control box is provided to facilitate operation of
the pump. It contains controls for starting and stop
ping the pump, and provides overload protection
for the pump motor. The pump control also con
tains low voltage circuits for the optional automatic
liquid level sensing device.
Component Function
The control box contains the following hand‐oper
ated switches and controls:
The control handle operates the control
box circuit breakers. In the OFF position, the
control handle opens the circuit breakers to
interrupt incoming power through the con
trol box and prevent pump operation. In the
ON position, it closes the circuit breakers to
permit pump operation. The circuit breakers
will open or “trip” automatically in the event
of a short circuit overload current. When
tripped, move the control handle to OFF and
back to ON to reset the circuit breakers.
The selector switch controls the mode of
operation. In the OFF position, it prevents all
operation of the pump. In the HAND posi
tion, it allows the pump to run continuously.
When used in conjunction with the optional
liquid level controls, the AUTO position al
lows the pump to be controlled automatical
ly by the liquid level control system.
The reset pushbutton resets the motor over
load after it has been TRIPPED by an over
load. The overload relay will trip automatical
ly if the current drawn by the motor exceeds
design specifications. Allow 10 seconds for