Gorman-Rupp Pumps PA10A60-4045H User Manual

ACDEU

OM−06344−01

April 15, 2010

INSTALLATION, OPERATION,

AND MAINTENANCE MANUAL

WITH PARTS LIST

PA SERIES PUMP

MODEL

PA10A60−4045H

THE GORMAN-RUPP COMPANY  MANSFIELD, OHIO

www.grpumps.com

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

2010 The Gorman-Rupp Company

Register your new
Gorman-Rupp pump online at
www.grpumps.com/register.

Valid serial number and e-mail address required.

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

RECORD YOUR PUMP MODEL AND SERIAL NUMBER

Please record your pump model and serial number in the
spaces provided below. Your Gorman-Rupp distributor
needs this information when you require parts or service.

Pump Model:

Serial Number:

TABLE OF CONTENTS

INTRODUCTION PAGE I − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SAFETY - SECTION A PAGE A − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INSTALLATION − SECTION B PAGE B − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pump Dimensions PAGE B − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PREINSTALLATION INSPECTION PAGE B − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Battery Installation 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

AUTO-START PAGE B − 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Float Switch Installation PAGE B − 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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

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

STARTING PAGE C − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Manual Starting PAGE C − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Automatic Starting PAGE C − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OPERATION PAGE C − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Leakage PAGE C − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pump Vacuum Check PAGE C − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Liquid Temperature And Overheating PAGE C − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Strainer Check PAGE C − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

BEARING TEMPERATURE CHECK PAGE C − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

i

TABLE OF CONTENTS

(continued)

PARTS LISTS:

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

Pump End Assembly PAGE E − 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pump Assembly PAGE E − 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Repair Rotating Assembly PAGE E − 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Priming Chamber Kit PAGE E − 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Priming Chamber Assembly PAGE E − 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Drive Assembly PAGE E − 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PUMP AND SEAL DISASSEMBLY AND REASSEMBLY PAGE E − 17. . . . . . . . . . . . . . . . . . . . . . . . .

Priming Chamber Removal And Disassembly PAGE C − 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Discharge Check Valve Removal and Disassembly PAGE C − 18. . . . . . . . . . . . . . . . . . . . . . . . .

Suction Spool and Wear Plate Removal PAGE C − 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Separating Pump And Drive Assembly From Engine PAGE C − 19. . . . . . . . . . . . . . . . . . . . . . . .

Draining Oil From Seal Cavity PAGE C − 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Loosening Impeller PAGE C − 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pump Casing Removal PAGE C − 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Impeller Removal PAGE C − 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Seal Removal PAGE C − 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shaft and Bearing Removal and Disassembly PAGE C − 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shaft and Bearing Reassembly and Installation PAGE C − 21. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Seal Reassembly and Installation PAGE C − 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Impeller Installation And Adjustment PAGE C − 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Suction Spool And Wear Plate Installation PAGE C − 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pump Casing Installation PAGE C − 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Securing Pump And Drive Assembly To Engine PAGE C − 25. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Priming Chamber Assembly And Installation PAGE C − 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Discharge Check Valve Reassembly And Installation PAGE C − 26. . . . . . . . . . . . . . . . . . . . . . .

Wear Plate Adjustment PAGE C − 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

LUBRICATION PAGE C − 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Seal Assembly PAGE C − 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bearings PAGE C − 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Engine PAGE C − 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ii

INTRODUCTION

OM−06344PA SERIES

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 centrif­ugal model. The unit is designed for handling non­volatile, non-flammable liquids containing speci­fied entrained solids. The basic material of con­struction is gray iron, with ductile iron impeller,
stainless steel shaft and ductile iron wear ring.

Because pump installations are seldom identical,
this manual cannot possibly provide detailed in­structions and precautions for every aspect of
each specific application. Therefore, it is the re­sponsibility of the owner/installer of the pump to
ensure that applications not addressed in this
manual are performed only after establishing that
neither operator safety nor pump integrity are com­promised by the installation. Pumps and related
equipment must be installed and operated ac­cording to all national, local and industry stan­dards.

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

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

Immediate hazards which WILL result in
severe personal injury or death. These
instructions describe the procedure re­quired and the injury which will result
from failure to follow the procedure.

Hazards or unsafe practices which
COULD result in severe personal injury
or death. These instructions describe
the procedure required and the injury
which could result from failure to follow
the procedure.

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

NOTE

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

For information or technical assistance on the en­gine, contact the engine manufacturer’s local
dealer or representative.

PAGE I − 1INTRODUCTION

PA SERIES

SAFETY - SECTION A

This information applies to Prime Aire
Series pumps. Refer to the manual ac­companying the engine or power
source before attempting to begin oper­ation.

r

damage the pump or endanger person­nel as a result of pump failure.

OM−06344

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

Before attempting to open or service the
pump:

1. Familiarize yourself with this man­ual.

2. Shut down the engine and discon­nect the positive battery cable to
ensure that the pump will remain
inoperative.

3. Allow the pump to completely cool
if overheated.

4. Check the temperature and make
sure the pump is cool before open­ing any covers, plates, or plugs.

5. Close the suction and discharge
valves.

6. Vent the pump slowly and cau­tiously.

7. Drain the pump.

Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam­age to equipment. Attach lifting equip­ment to the lifting device fitted to the
pump. If chains or cable are wrapped
around the pump to lift it, make certain
that they are positioned so as not to
damage the pump, and so that the load
will be balanced. The bail is intended for
use in lifting the pump assembly only.
Suction and discharge hoses and pip­ing must be removed from the pump be­fore lifting.

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

Do not operate the pump 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 pres­sure, and cause the pump casing to rup­ture or explode. Momentary closure of a
discharge valve is acceptable only
when required for startup or shutdown
procedures.

This pump is designed to handle most
non-volatile, non-flammable liquids
containing specified entrained solids.
Do not attempt to pump volatile, corro­sive, or flammable liquids which may

Do not remove plates, covers, gauges,
pipe plugs, or fittings from an over-

PAGE A − 1SAFETY

heated pump. Vapor pressure within the
pump can cause parts being disen­gaged to be ejected with great force. Al­low the pump to cool completely before
servicing.

This pump may be used to handle mate­rials which could cause illness through
direct exposure or emitted fumes. Wear
adequate protective clothing when
working on the pump or piping.

Do not operate the pump without guards
in place over the rotating parts. Ex­posed rotating parts can catch clothing,
fingers or tools, causing severe injury to
personnel.

PA SERIESOM−06344

Do not operate an internal combustion
engine in an explosive atmosphere.
When operating an internal combustion
engine in an enclosed area, make sure
exhaust fumes are piped to the outside.
These fumes contain carbon monoxide,
a deadly gas that is colorless, tasteless
and odorless.

Fuel used by internal combustion en­gines presents an extreme explosion
and fire hazard. Make certain that all
fuel lines are securely connected and
free of leaks. Never refuel a hot or run­ning engine. Avoid overfilling the fuel
tank. Always use the correct type of fuel.

Make sure the pump is level. Lower jack
stands and chock the wheels, if so
equipped. Use caution when positioning
the skid-mounted unit to prevent damage
to the fuel tank.

Never tamper with the governor to gain
more power. The governor establishes
safe operating limits that should not be
exceeded. The maximum continuous
operating speed for this pump is 1950
RPM.

PAGE A − 2 SAFETY

PA SERIES OM−06344

INSTALLATION − SECTION B

Review all SAFETY information in Section A.

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

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

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

OUTLINE DRAWING

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 dimen­sions of this pump.

Figure 1. Pump Model PA10A60−4045H

PREINSTALLATION INSPECTION

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

a. Inspect the pump for cracks, dents, damaged

threads, and other obvious damage.

b. Check for and tighten loose attaching hard-

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

PAGE B − 1INSTALLATION

OM−06344 PA SERIES

c. Carefully read all tags, decals, and markings

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

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

d. Check levels and lubricate as necessary. Re-

fer to LUBRICATION in the Maintenance and
Repair Manual and perform duties as in­structed.

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

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

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

POSITIONING PUMP

Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam­age to equipment. Attach lifting equip­ment to the lifting device fitted to the
pump. If chains or cable are wrapped
around the pump to lift it, make certain
that they are positioned so as not to
damage the pump, and so that the load
will be balanced. The bail is intended for
use in lifting the pump assembly only.
Suction and discharge hoses and pip­ing must

be removed from the pump be-

fore lifting.

Lifting

Pump unit weights will vary depending on the
mounting and drive provided. Check the shipping
tag on the unit packaging for the actual weight, and
use lifting equipment with appropriate capacity.
Drain the pump and remove all customer-installed
equipment such as suction and discharge hoses
or piping before attempting to lift existing, installed
units.

Battery Installation

Unless otherwise specified on the pump order, the
engine battery is not included with engine driven
units.

Refer to the information accompanying the battery
and/or electrolyte solution for activation and charg­ing instructions.

Before installing the battery, clean the positive and
negative cable connectors, and the battery termi­nals. Secure the battery by tightening the
holddown brackets. The terminals and clamps
may be coated with petroleum jelly to retard corro­sion. Connect and tighten the positive cable first,
then the negative cable.

PAGE B − 2 INSTALLATION

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 mount­ing is essential for proper operation. The pump
may have to be supported or shimmed to provide
for level operation and eliminate vibration.

For engine driven units, the pump must be posi-
tioned as level as possible to ensure sufficient lubri­cation and fuel supply to the engine.

If the pump has been mounted on a moveable
base, make certain the base is stationary by setting

PA SERIES OM−06344

the brake and blocking the wheels before attempt­ing to operate the pump.

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 in­creased suction lift, discharge elevation, and fric­tion losses. See the performance curve and oper­ating 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, rein­forced type to prevent collapse under suction. Us­ing piping couplings in suction lines is not recom­mended.

Line Configuration

Keep suction and discharge lines as straight as
possible to minimize friction losses. Make mini­mum use of elbows and fittings, which substan­tially increase friction loss. If elbows are necessary,
use the long-radius type to minimize friction loss.

Connections to Pump

Before tightening a connecting flange, align it ex­actly with the pump port. Never pull a pipe line into
place by tightening the flange bolts and/or cou­plings.

Lines near the pump must be independently sup­ported to avoid strain on the pump which could
cause excessive vibration, decreased bearing life,
and increased shaft and seal wear. If hose-type

lines are used, they should have adequate support
to secure them when filled with liquid and under
pressure.

Gauges

The pump is drilled and tapped for installing dis­charge 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 prim­ing, the suction line must be as short and direct as
possible. When operation involves a suction lift, the
line must always slope upward to the pump from
the source of the liquid being pumped; if the line
slopes down to the pump at any point along the
suction run, air pockets will be created.

Fittings

Suction lines should be the same size as the pump
inlet. If reducers are used in suction lines, they
should be the eccentric type, and should be in­stalled with the flat part of the reducers uppermost
to avoid creating air pockets. Valves are not nor­mally used in suction lines, but if a valve is used,
install it with the stem horizontal to avoid air pock­ets.

Strainers

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.

PAGE B − 3INSTALLATION

OM−06344 PA SERIES

Sealing

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

Suction Lines In Sumps

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

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

If it is necessary to position inflow close to the suc­tion inlet, install a baffle between the inflow and the
suction inlet at a distance 1-1/2 times the diameter
of the suction pipe. The baffle will allow entrained

air to escape from the liquid before it is drawn into
the suction inlet.

If two suction lines are installed in a single sump,
the flow paths may interact, reducing the efficiency
of one or both pumps. To avoid this, position the
suction inlets so that they are separated by a dis­tance equal to at least 3 times the diameter of the
suction pipe.

Suction Line Positioning

The depth of submergence of the suction line is
critical to efficient pump operation. Figure 2
shows recommended minimum submergence vs.
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).

PAGE B − 4 INSTALLATION

PA SERIES OM−06344

Figure 2. Recommended Minimum Suction Line Submergence vs. Velocity

DISCHARGE LINES

Siphoning

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

Valves

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 pres­sure and reverse rotation when it is stopped.

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

ALIGNMENT

The alignment of the pump, air compressor and
engine is critical for trouble-free mechanical opera­tion. See Section E, Securing Intermediate And

Drive Assembly To Engine in MAINTENANCE
AND REPAIR, for details.

AUTO-START

The standard pump is equipped with an 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 installa­tion details for the liquid level sensing system pro­vided with your pump.

PAGE B − 5INSTALLATION

OM−06344 PA SERIES

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 ob­structed or drawn into the suction line. If a flex­ible 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 bot­tom. 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 approxi­mate desired liquid level.

b. In a single float system, the cable can be teth-

ered to the suction line or standpipe approxi­mately 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 approxi­mately 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 3 for additional float switch

data.

ENGINE

CONTROL

BOX

CABLE

TETHER

POINT

1.25" Pipe
(Not Furnished)

ON

(Emptying)

OFF

(Filling)

OPERATING

RANGE

(See Table Below)

OFF

(Emptying)

ON

(Filling)

Figure 3. Float Switch Data

3.0

(0.9)

2.5

(.76)

2.0

(0.6)

1.5

(.46)

1.0

(0.3)

0.5

(.15)

1.0

(0.3)

APPROXIMATE FREE CORD LENGTH IN FT. (M)

2.0

(0.6)

3.0

(0.9)

4.0

(1.2)

PAGE B − 6 INSTALLATION

PA SERIES

OM−06344

OPERATION − SECTION C

Review all SAFETY information in Section A.

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

Do not operate an internal combustion
engine in an explosive atmosphere.
When operating an internal combustion
engine in an enclosed area, make sure
exhaust fumes are piped to the outside.
These fumes contain carbon monoxide,
a deadly gas that is colorless, tasteless
and odorless.

OPERATION

cated (see LUBRICATION in MAINTENANCE
AND REPAIR).

The pump will begin to prime upon startup. The air
in the suction line will be discharged from the educ­tor discharge line. Complete priming is indicated
by a positive discharge pressure reading.

If full priming is not achieved, the discharge check
valve may be malfunctioning. If this occurs, shut
down the pump and consult Maintenance and

Repair, Section E for further details.

STARTING

Check the fuel level and oil levels in the engine, air
compressor, pump bearings and seal housing.

Make sure the pump is level. Lower the jack stands
and chock the wheels, if so equipped.

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 endan­ger personnel as a result of pump fail­ure.

Pump speed and operating condition
points must be within the continuous per­formance range shown on the perfor­mance curve in Section E on page E−1.

PRIMING

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

tions are tight, and that the pump is securely
mounted. Check that the pump is properly lubri-

Make sure the pump is level. Lower jack
stands and chock the wheels, if so
equipped. Use caution when positioning
the skid-mounted unit to prevent damage
to the fuel tank.

This pump is equipped with automatic
liquid level controls, and is subject to
automatic restart. Keep hands and
clothing away from the unit to prevent
injury during automatic operation. Dis­connect the positive battery cable be­fore performing any maintenance. Fail­ure to do so may result in serious per­sonal injury.

Consult the engine operations manual before at­tempting to start the unit.

Manual Starting

On initial start-up, set the engine speed at in the
half-throttle position. Turn the keyswitch to ‘MANU-

OPERATION PAGE C − 1

OM−06344 PA SERIES

AL’. After the engine starts and the unit is fully
primed, adjust the engine RPM until the desired
flow rate is achieved.

Pump speed and operating condition
points must be within the continuous per­formance range shown on the curve on
Page E-1.

Automatic Starting

With the float system installed, follow the proce­dures outlined for manual starting and throttle ad­justment. Switch the keyswitch to ‘OFF’ until the
water level rises above the on point for the float sys­tem, then turn the keyswitch to the ‘AUTO’ setting.
The unit will run until the float signals the control
that the water in the wet well is at the float off point,
at which time the unit will shut down automatically.
When the float signals the control that the water in
the wet well is at the float on point, the unit will re­start automatically, repeating the cycle.

OPERATION

Liquid Temperature And Overheating

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

Overheating can occur if operated with the valves
in the suction or discharge lines closed. Operating
against closed valves could bring the liquid to a
boil, build pressure, and cause the pump to rup­ture or explode. If overheating occurs, stop the
pump immediately and allow it to completely cool
before servicing it. Approach any over-heated

pump cautiously.

Allow an over-heated pump to com­pletely cool before servicing. Do not re­move plates, covers, gauges, or fittings
from an overheated pump. Liquid within
the pump can reach boiling tempera­tures, and vapor pressure within the
pump can cause parts being disen­gaged to be ejected with great force. Af­ter the pump 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.

Leakage

Once the pump is fully primed, no leakage should
be visible at pump mating surfaces, or at pump
connections or fittings. Keep all line connections
and fittings tight to maintain maximum pump effi­ciency.

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 pro­portionate to static suction lift, and should then sta­bilize. If the vacuum reading falls off rapidly after
stabilization, an air leak exists. Before checking for
the source of the leak, check the point of installa­tion of the vacuum gauge.

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 over-heat­ing 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 specified or provided by the Gorman-Rupp
Company.

Strainer Check

Check the strainer regularly, and clean it as neces­sary. The strainer should also be checked if pump
flow rate begins to drop. Monitor and record the

OPERATIONPAGE C − 2

PA SERIES

OM−06344

vacuum suction gauge readings regularly to detect
strainer blockage.

Never introduce air or steam pressure into the
pump casing or piping to remove a blockage. This
could result in personal injury or damage to the
equipment. If backflushing is absolutely neces­sary, liquid pressure must be limited to 50% of the
maximum permissible operating pressure shown
on the pump performance curve.

STOPPING

Never halt the flow of liquid suddenly. If the liquid
being pumped is stopped abruptly, damaging
shock waves can be transmitted to the pump and
piping system. Close all connecting valves slowly.

Reduce the throttle speed slowly and allow the en­gine to idle briefly before stopping.

normal for bearings, and they can operate safely to
at least 180F (82C).

Checking bearing temperatures by hand is inaccu­rate. Bearing temperatures can be measured ac­curately by placing a contact-type thermometer
against the housing. Record this temperature for
future reference.

A sudden increase in bearing temperatures is a
warning that the bearings are at the point of failing
to operate properly. Make certain that the bearing
lubricant is of the proper viscosity and at the cor­rect level (see LUBRICATION in the Maintenance
and Repair Manual). Bearing overheating can also
be caused by shaft misalignment and/or excessive
vibration.

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

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

After stopping the pump, switch off the engine igni­tion and remove the key to ensure that the pump
will remain inoperative.

BEARING TEMPERATURE CHECK

Bearings normally run at higher than ambient tem­peratures because of heat generated by friction.
Temperatures up to 160F (71C) are considered

Cold Weather Preservation

In below freezing conditions, drain the pump to
prevent damage from freezing. Also, clean out any
solids by flushing with a hose. Operate the pump
for approximately one minute; this will remove any
remaining liquid that could freeze the pump rotat­ing parts. If the pump will be idle for more than a
few hours, or if it has been pumping liquids con­taining a large amount of solids, drain the pump,
and flush it thoroughly with clean water. To prevent
large solids from clogging the drain port and pre­venting the pump from completely draining, insert
a rod or stiff wire in the drain port, and agitate the
liquid during the draining process. Clean out any
remaining solids by flushing with a hose.

OPERATION PAGE C − 3

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. Shut down the engine and discon­nect the positive battery cable to en­sure that the pump will remain inop­erative.

3. Allow the pump to completely cool if
overheated.

4. Check the temperature and make
sure pump is cool before opening
any covers, plates, or plugs.

5. Close the suction and discharge
valves.

6. Vent the pump slowly and cautiously.

7. Drain the pump.

OM−06344

TROUBLE POSSIBLE CAUSE PROBABLE REMEDY

PUMP FAILS TO
PRIME

PUMP STOPS OR
FAILS TO DELIVER
RATED FLOW OR
PRESSURE

Discharge check valve contami­nated, damaged, or unable to seat.

Air compressor head 180 out. Consult factory.

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 or belts bro­ken.

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.

Check and repair/replace.

sary.

leaking or worn seal or gasket.

TROUBLESHOOTING PAGE D − 1

OM−06344

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 engine output; consult en-

Belt or flexible coupling broken. Check and replace as necessary.

Pump speed too high. Check engine output.

Extreme ambient temperature. Reduce pump output.

Discharge head too low.
Fuel filter clogged. Check & replace often in extreme

Check strainer and clean if neces­sary.

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. Re­duce lift and/or friction losses in
suction line.

gine operation manual.

Adjust discharge valve.

operating conditions.

PUMP CLOGS
FREQUENTLY

EXCESSIVE NOISE

Dilute if possible.Liquid solution too thick.

Check and replace as required.Fuel contaminated.

Pump or jack shaft bearing(s) frozen. Disassemble, check and replace

bearing(s) as required..

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.

Impeller clogged or damaged.

Open discharge valve fully to in­crease flow rate, and run engine at
maximum governed speed.

Clean valve.

Dilute if possible.

losses in suction line. Record vac­uum and pressure gauge readings
and consult local representative or
factory.

Locate and eliminate source of air
bubble.

Secure mounting hardware.Pump or drive not securely mounted.

Clean out debris; replace damaged
parts.

TROUBLESHOOTINGPAGE D − 2

PA SERIES

TROUBLE POSSIBLE CAUSE PROBABLE REMEDY

OM−06344

BEARINGS RUN
TOO HOT

Bearing temperature is high, but
within limits.

Low or incorrect lubricant.

Suction and discharge lines not prop­erly supported.

Excessive tension on drive belt.

PREVENTIVE MAINTENANCE

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

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

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

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

TROUBLESHOOTING PAGE D − 3

OM−06344

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

PA SERIES

OM−06344

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 PA10A60−4045H

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

Contact the Gorman-Rupp Company to verify per­formance or part numbers.

Pump speed and operating condition

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

MAINTENANCE & REPAIR PAGE E − 1

points must be within the continuous per­formance range shown on the curve.

OM−06344 PA SERIES

PARTS PAGE

ILLUSTRATION

Figure 1. Pump Model PA10A60−4045H

MAINTENANCE & REPAIRPAGE E − 2

PA SERIES

OM−06344

PARTS LIST

Pump Model PA10A60−4045H

(From S/N 1452219 Up)

ITEM
NO.

1 PUMP END ASSEMBLY PA10A60−(SAE 3/11.5) 1
2 J.D. POWER UNIT 46143−098 −−− 1
3 PUMP MOUNTING KIT 48157−047 −−− 1
4 HEX HD CAPSCREW B1211 15991 2
5 FLAT WASHER K12 15991 4
6 LOCK WASHER J12 15991 2
7 HEX NUT D12 15991 2
8 BATTERY SEE OPTIONS REF
9 PRIME AIRE DECAL 38812−078 −−− 2

10 G-R DECAL GR−06 −−− 2

NOT SHOWN:

PART NAME

INSTRUCTION TAG 38817−085 −−− 1
CAUTION DECAL 2613FJ −−− 1
WARNING DECAL 2613FE −−− 2
NAME PLATE 38817−127 13000 1
DRIVE SCREW BM#04−03 17000 4
LUBE DECAL 38816−079 −−− 1
OIL LEVEL DECAL 38816−123 −−− 1

PART
NUMBER

MAT’L
CODE

QTY

MAINTENANCE & REPAIR PAGE E − 3

OM−06344 PA SERIES

ILLUSTRATION

Figure 2. 46143−020 Power Unit Kit

MAINTENANCE & REPAIRPAGE E − 4

PA SERIES

ITEM

PART NAME PART

NO.

NUMBER

PARTS LIST

46143−098 Power Unit Kit

MAT’L
CODE

QTY ITEM

NO.

PART NAME PART

NUMBER

OM−06344

MAT’L
CODE

QTY

1 J.D. ENGINE 29224−305 −−− 1
2 BASE/FUEL TANK 41553−020 24150 1
3 LIFTING BAIL KIT 48274−805 −−− 1
4 MALE ELBOW 26351−131 −−− 1
5 CONNECTOR S1447 −−− 1
6 HOSE ASSY 46341−789 −−− 1
7 BATTERY BOX ASSY 42432−005 −−− 1
8 OIL DRAIN ASSY 46342−013 −−− 1

9 POS BATT CABLE ASSY 47311−117 −−− 1
10 FUEL GAUGE 29332−135 −−− 1
11 FUEL PICKUP 29332−145 −−− 2
12 HOSE BARB FITTING 26523−386 −−− 2
13 3/16" ID x 30" LG. HOSE 11308M −−− 1
14 HOSE CLAMP 26518−641 −−− 2
15 HEX HD CAPSCREW B1007 15991 4
16 HEX NUT D10 15991 4
17 LOCK WASHER J10 15991 4
18 FLAT WASHER 21161−442 −−− 8
19 PIPE ELBOW AG08 11999 2
20 VENTURI 26817−002 −−− 1
21 PIPE COUPLING AE08 15079 1

22 CHECK VALVE 26641−092 −−− 1
23 HOSE BARB FITTING 26523−061 −−− 1
24 RED PIPE BUSHING AP0806 15079 1
25 PIPE UNION AH08 11999 1
26 PIPE TEE U08 11999 1
27 CONNECTOR 26351−065 −−− 2
28 HOSE ASSY 46341−426 −−− 1
29 PRESS RELIEF VALVE 26662−−028 −−− 1
30 CONNECTOR S1598 −−− 1
31 HOSE BARB FITTING 26523−047 −−− 1
32 1/2" ID x 60" LG. HOSE 18513−113 −−− 1
33 NEG BATT CABLE ASSY 47311−134 −−− 1
34 CONT PANEL INST KIT 48122−544 −−− 1
35 PIPE NIPPLE T0806 15070 1

NOT SHOWN:

ENGINE STARTUP TAG 38816−269 −−− 1
WARNING DECAL 38816−203 −−− 4
WARNING DECAL 38816−345 −−− 2
INSTRUCTION DECAL 38818−144 −−− 1
WARNING DECAL 38816−132 −−− 2
FLOAT SWITCH KIT 48312−980 −−− 1

MAINTENANCE & REPAIR PAGE E − 5

OM−06344 PA SERIES

ILLUSTRATION

Figure 3. PA10A60−(SAE 3/11.5) Pump Assembly

MAINTENANCE & REPAIRPAGE E − 6

PA SERIES

OM−06344

PARTS LIST

PA10A60−(SAE 3/11.5) Pump Assembly

ITEM
NO.

1 PUMP END ASSEMBLY 610N60−(SAE 3/11.5) 1
2 PRIMING CHAMBER ASSEMBLY 46112−705 −−− 1
3 CHECK VALVE KIT 48274−007 −−− 1

4 GASKET 25113−040 −−− 1
5 HEX HD CAPSCREW B1414 15991 12
6 LOCK WASHER J14 15991 12
7 HEX NUT D14 15991 12
8 SUCTION SPOOL 38644−807 10000 1

9 BLIND FLANGE ASSY 42111−358 −−− 1
10 GASKET 25113−034 −−− 1
11 HEX HD CAPSCREW B1007 15991 8
12 LOCK WASHER J10 15991 8

NOT SHOWN:

PART NAME

−CHECK VALVE 26642−127 −−− 1

−FLAPPER 26688−007 −−− 1

−COVER GASKET 26688−008 −−− 1

−GASKET 25113−040 −−− 1

STRAINER 46641−011 24150 1

PART
NUMBER

MAT’L
CODE

QTY

INDICATES PARTS RECOMMENDED FOR STOCK

MAINTENANCE & REPAIR PAGE E − 7

OM−06344 PA SERIES

ILLUSTRATION

Figure 4. 610N60−(SAE 3/11.5) Pump End Assembly

MAINTENANCE & REPAIRPAGE E − 8

PA SERIES

ITEM

PART NAME PART

NO.

PARTS LIST

610N60−(SAE 3/11.5) Pump End Assembly

NUMBER

MAT’L
CODE

QTY ITEM

NO.

PART NAME PART

NUMBER

OM−06344

MAT’L
CODE

QTY

1 PUMP CASING 3197 10010 1

2 IMPELLER 38615−091 11010 1

3 MECH SEAL ASSY 46512−048 −−− 1
4 IMP ADJ SHIM SET 5091 17090 REF
5 PIPE PLUG P04 15079 1
6 SEAL PLATE 38272−716 10000 1

7 O-RING 25152−276 −−− 2
8 STUD C0810 15991 12

9 HEX NUT D08 15991 24
10 LOCK WASHER J08 15991 24
11 VENTED PIPE PLUG 4823A 15079 1
12 RED PIPE BUSHING AP0802 15079 1
13 AIR VENT S1530 −−− 1
14 INTERMEDIATE 38264−705 10000 1
15 HEX HD CAPSCREW B0605 15991 10
16 LOCK WASHER J06 15991 10
17 BEARING COVER 38322−432 10000 1

18 BALL BEAINRG 23422−413 −−− 1

19 SHAFT KEY N0610 15990 1

20 IMPELLER SHAFT 38512−524 1706H 1
21 RETAINING RING 24124−052 −−− 1

22 LIP SEAL 25258−725 −−− 1

22A LIP SEAL 25258−725 −−− 1

22B LIP SEAL 25258−725 −−− 1

23 THRUST WASHER 31134−114 15000 1

24 BRG COVER GASKET 38683−475 18000 1
25 SEAL CVTY SIGHT GAGE S1471 −−− 1

25A BRG CVTY SIGHT GAGE S1471 −−− 1

26 PIPE PLUG P12 15079 2
27 BRG CVTY DRAIN PLUG P08 15079 2

27A SEAL CVTY DRAIN PLUG P08 15079 2

28 BALL BEARING S1911 −−− 1

29 CASING GASKET 3200G 18000 1
30 PIPE PLUG P16 10009 5

31 SUCT HEAD O-RING 25152−277 −−− 1
32 HEX HD CAPSCREW B0604 15991 4
33 JAM NUT AT06 15991 4
34 SUCTION HEAD 38248−506 10000 1

35 WEAR RING 38691−634 11010 1
36 PIPE PLUG P06 15079 1
37 STUD C0811 15991 12

NOT SHOWN:

LUBE DECAL 11421A −−− 1
SUCTION STICKER 6588AG −−− 1
DISCHARGE STICKER 6588BJ −−− 1
INTERMEDIATE GUARD 42381−031 −−− 2
DRIVE ASSY 44162−157 −−− 1
HEX HD CAPSCREW B0604 15991 2

INDICATES PARTS RECOMMENDED FOR STOCK

MAINTENANCE & REPAIR PAGE E − 9

OM−06344 PA SERIES

ILLUSTRATION

Figure 5. 48275−005 Priming Chamber Kit

ITEM
NO.

1 PRIMING CHAMBER ASSY 46112−709 −−− 1
2 PIPE BUSHING AP1608 11999 1
3 STREET ELBOW RS08 11999 1
4 BALL VALVE 26631−052 −−− 1
5 STUD C0809 15991 4
6 HEX NUT D08 15991 4
7 LOCK WASHER J08 15991 4
8 GASKET 38687−053 19060 1
9 BAFFLE 31113−011 17000 1

INDICATES PARTS RECOMMENDED FOR STOCK

PART NAME

PART
NUMBER

MAT’L
CODE

MAINTENANCE & REPAIRPAGE E − 10

QTY

PA SERIES

OM−06344

ILLUSTRATION

Figure 6. 46112−709 Priming Chamber Assembly

ITEM
NO.

1 PRIMING VALVE 26664−007 −−− 1

2 HEX HD CAPSCREW B0806 15991 8
3 LOCKWASHER J08 15991 8
4 PRIMING VALVE GASKET 38683−657 19060 1
5 PRIMING CHAMBER 38343−020 10000 1
6 STRAINER ASSY 46641−222 17000 1

INDICATES PARTS RECOMMENDED FOR STOCK

MAINTENANCE & REPAIR PAGE E − 11

PART NAME

−ORIFICE BUTTON 26688−021 −−− 1

PART
NUMBER

MAT’L
CODE

QTY

OM−06344 PA SERIES

ILLUSTRATION

Figure 7. 44162−157 Drive Assembly

ITEM
NO.

1 COUPLING 24391−102 −−− 1
2 BUSHING 24131−497 −−− 1
3  SOCKET HEAD CAPSCREW BD0606 15990 8

4  LOCK WASHER J06 15991 8

5  HEX HEAD CAPSCREW B0605 15991 12

6  LOCK WASHER J06 15991 12

PART NAME

 SOCKET HEAD CAPSCREW 22644−220 −−− 8

 LOCK WASHER 21171−511 −−− 8

 HEX HEAD CAPSCREW 22645−164 −−− 12

 LOCK WASHER 21171−511 −−− 12

 USE FOR SAE APPLICATIONS
 USE FOR METRIC APPLICATIONS

PART
NUMBER

MAT’L
CODE

MAINTENANCE & REPAIRPAGE E − 12

QTY

PA SERIES

OM−06344

PUMP AND SEAL DISASSEMBLY AND REASSEMBLY

Review all SAFETY information in Section A.

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

This pump requires little service due to its rugged,
minimum-maintenance design. However, if it be­comes necessary to inspect or replace the wearing
parts, follow these instructions which are keyed to
the illustrations (see Figures 1 through 7) and the
corresponding Parts Lists. Maintenance and repair
instructions for the engine is covered separately in
the specific literature supplied by the manufactur­er.

Many pump service functions may be performed
without separating the pump end assembly from
the engine. However, the priming chamber assem­bly and discharge piping must be removed to ser­vice most pump components. The following in­structions assume complete disassembly of the
pump is required.

Before attempting to service the pump, shut down
the engine and take precautions to ensure that it
will remain inoperative. Close all valves in the suc­tion and discharge lines and drain the pump cas­ing by removing the lowermost pipe plug (10, Fig­ure 4) from the pump casing. Clean and reinstall
the drain plug.

This manual will alert personnel to
known procedures which require spe­cial attention, to those which could
damage equipment, and to those which
could be dangerous to personnel. How­ever, this manual cannot possibly antici­pate and provide detailed 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 main­tenance procedures are used, and that
any procedures not addressed in this

manual are performed only after estab­lishing that neither personal safety nor
pump integrity are compromised by
such practices.

Before attempting to open or service the
pump:

1. Familiarize yourself with this man­ual.

2. Shut down the engine and discon­nect the positive battery cable to
ensure that the pump will remain
inoperative.

3. Allow the pump to completely cool
if overheated.

4. Check the temperature 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 cau­tiously.

7. Drain the pump.

This pump is designed to handle materi­al which could cause illness through di­rect exposure or emitted fumes. Wear
adequate protective clothing when
working on the pump or piping.

Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam­age to equipment. The bail is intended
for use in lifting the pump assembly
only. Suction and discharge hoses and
piping must be removed from the pump
before lifting. If chains or cables are
used to lift pump components, make
certain that they are positioned so as

MAINTENANCE & REPAIR PAGE E − 13

PA SERIESOM−06344

not to damage the pump, and so that the
load will be balanced.

Use only replacement parts provided or
approved by Gorman-Rupp. Use of non­authorized parts may result in damage to
the equipment and/or injury to personnel
and will invalidate the warranty.

Priming Chamber Removal And Disassembly

(Figure 5)

Disconnect the air discharge tubing from the prim­ing chamber assembly (1). Support the priming
chamber assembly using a sling and a suitable lift­ing device. Remove the hardware (6 and 7) and
separate the priming chamber assembly, gasket
(8) and baffle (9) from the spool (8, Figure 3).

Discharge Check Valve Removal and
Disassembly

(Figure 3)

Support the discharge check valve assembly us­ing a sling and a suitable lifting device. Remove the
hardware securing the discharge check valve as­sembly and gasket to the piping.

The flapper and cover gasket are the only service­able parts of the check valve. If the flapper requires
replacement, remove the hardware securing the
cover and gasket. Separate the cover and remove
the flapper.

Suction Spool Flange Removal

(Figure 3)

Before attempting to disassemble the pump, re­move the lowermost pipe plug (30, Figure 4) from
the pump casing and drain the pump. Clean and
reinstall the pipe plug.

Disconnect the suction piping from the suction
spool flange (8).

(Figure 6)

Remove the hardware (2 and 3) securing the prim­ing valve (1) to the priming chamber (5). Carefully
lift the valve components from the priming cham­ber. Remove the gasket (4) and clean the mating
surfaces.

If the priming valve float is stuck or the strainer (6) is
clogged, it can usually be cleaned without further
disassembly.

The only serviceable part of the priming valve is the
orifice button (not shown). If liquid continues to by­pass through the priming chamber after adjusting
the orifice button (see Priming Chamber Reas-
sembly and Installation for adjustment), the but­ton may require replacement. To replace the orifice
button, remove one of the e-clips" from the pivot
pin closest to the orifice button and remove the piv­ot pin. This will allow the linkage to be raised high
enough to access the orifice button.

Support the suction spool flange using a suitable
hoist and sling. Disengage the hardware (not
shown) securing the suction spool flange to the
base.

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

Remove the hardware (5) and separate the suction
spool flange and gasket (4) from the pump.

Suction Head And Wear Ring Removal

Remove the hex nut and lockwasher securing the
orifice button to the linkage bar and unscrew the
orifice button from the linkage bar.

(Figure 4)

Support the suction head (34) using a suitable
hoist and sling.

MAINTENANCE & REPAIRPAGE E − 14

PA SERIES

OM−06344

Remove the hardware (9 and 10). Use a pair of pry
bars or large screwdrivers to pry the suction head
and wear ring (35) from the pump casing (1).

Inspect the wear ring. If replacement is required, or
if the O-rings (7 and 31) require replacement, re­move the hardware (15 and 16) securing the suc­tion head to the wear ring.

Use a set of pry bars or large screwdrivers to pry
the suction head and wear plate out of the volute
casing.

Remove the adjusting screws and jam nuts (32
and 33). Remove the jam nuts from the adjusting
screws and reinstall the adjusting screws. Use the
adjusting screws to push the wear ring out of the
suction head.

Remove the adjusting screws, install the jam nuts,
and reinstall the adjusting screws in the suction
head.

must be replaced. To remove the ring, disengage
the hardware (3 and 4) securing it to the flywheel.

Move the pump end to a clean, well equipped shop
area for further disassembly.

Draining Oil From Seal Cavity

(Figure 4)

If any further disassembly is to be performed on the
pump, the seal oil cavity must be drained to pre­vent the oil in the seal cavity from escaping as the
pump casing is removed.

Position a clean container (1 gallon [4 liter] mini­mum), under the seal cavity drain plug (27A). Re­move the drain plug and drain the oil from the seal
cavity into the container. Clean and reinstall the
drain plug. Inspect the oil for water, dirt or a cloudy
condition which could indicate seal failure.

Separating Intermediate And Drive Assembly
From Engine

(Figure 7)

Further disassembly of the pump requires separat­ing the pump end and drive assembly from the en­gine. Disconnect the discharge piping from the
pump casing.

Remove the hardware (5 and 6) securing the inter­mediate to the bellhousing. Separate the assem­blies by pulling the pump end straight away from
the engine.

As the assemblies separate, the flexible portion of
the coupling assembly (1) will remain on the shaft.
To remove the coupling from the shaft, unscrew the
two allen head setscrews from the bushing (2).
Screw one of the setscrews into the puller hole on
the circumference of the bushing. As the coupling
and bushing separate, remove the bushing, and
slide the coupling off the shaft. Remove the shaft
key (19, Figure 4).

It is not necessary to remove the outer ring of the
coupling from the flywheel unless the coupling

Loosening Impeller

(Figures 4 and 8)

With the pump end separated from the power sour­ce, position the pump end on a flat surface with the
drive end facing up. Insert a block of wood through
the pump discharge and wedge it between the
vanes of the impeller and the pump casing to pre­vent rotation.

Install the shaft key (19) in the shaft keyway. Install
a lathe dog on the drive end of the shaft (20) with
the V" notch positioned over the shaft key.

With the impeller rotation still blocked, see Figure 8
and use a long piece of heavy bar stock to pry
against the arm of the lathe dog in a counterclock­wise direction (when facing the drive end of the
shaft). Use caution not to damage the shaft or key­way. When the impeller breaks loose, remove the
lathe dog, key and wood block.

NOTE

Do not remove the impeller until the rotating assem­bly has been removed from the pump casing.

MAINTENANCE & REPAIR PAGE E − 15

PA SERIESOM−06344

Turn

Counterclockwise

Lathe Dog Arm

Heavy

Bar Stock

Figure 8. Loosening Impeller

Pump Casing Removal

(Figure 4)

V" Notch

Shaft Key

Impeller Shaft

Lathe Dog

Setscrew

Seal Removal

(Figures 4 and 9)

Slide the impeller adjusting shims (4) off the impel­ler shaft. Tie and tag the shims or measure and re­cord their thickness for ease of reassembly.

Remove the seal spring. Lubricate the shaft in the
area adjacent to the seal with light oil and work it up
under the bellows. Slide the rotating portion of the
seal (consisting of the bellows, retainer, and rotat­ing element) off the shaft as a unit.

Slide the seal plate and stationary portion of the
seal off the shaft. Position the seal plate on a flat
surface with the impeller side down. Use a wooden
dowel or other suitable tool to press on the back
side of the stationary seat until the seat, element
and O-rings can be removed.

Remove the seal plate O-ring (7).

If no further disassembly is required, refer to Seal

Installation.

Shaft and Bearing Removal and Disassembly

With the pump end resting on a flat surface and the
drive end facing up, secure a suitable lifting device
to the bellhousing mounting holes in the intermedi­ate (14).

Remove the hardware (9 and 10). Apply tension on
the lifting device and use a pair of pry bars or large
screwdrivers to separate the pump casing at the
gasket (29).

Remove the rotating portion of the pump and place
it on a clean work surface. Discard the pump cas­ing gasket.

Impeller Removal

(Figure 4)

To remove the impeller (2), unscrew it in a counter­clockwise direction (when facing the impeller). Use
caution when removing the impeller; tension on
the shaft seal spring will be released as the impeller
is unscrewed. Inspect the impeller and replace it if
cracked or badly worn.

(Figure 4)

When the pump is properly operated and main­tained, the bearing housing should not require dis­assembly. Disassemble the shaft and bearings
only when there is evidence of wear or damage.

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 (27) and
drain the lubricant. Clean and reinstall the drain
plug.

Disengage the hardware (15 and 16) and remove
the bearing cover (17), gasket (24) and oil seal
(22). Use a suitably sized dowel to press the oil seal
from the bearing cover.

Place a block of wood against the impeller end of
the shaft (20) and tap the shaft and assembled
bearings (18 and 28) from the intermediate. Press

MAINTENANCE & REPAIRPAGE E − 16

PA SERIES

OM−06344

the inboard oil seals (22A and 22B) out of the inter­mediate.

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

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

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

housing. Replace the bearings, shaft, or bearing
housing if the proper bearing fit is not achieved.

If bearing replacement is required, remove the re­taining ring (21) and thrust washer (23). Use a
bearing puller to remove the inboard and outboard
bearings from the shaft.

Shaft and Bearing Reassembly and Installation

(Figure 4)

Inspect the shaft 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.

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

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 great­ly shorten bearing life. Do not spin dry
bearings. This may scratch the balls or
races and cause premature bearing fail­ure.

Rotate the bearings by hand to check for rough­ness or binding and inspect the bearing balls. If ro­tation 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

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. Bear­ings should never be heated with a direct flame or
directly on a hot plate.

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.

Heat the bearings to a uniform temperature no
higher than 250F (120C), and slide the bearings

onto the shaft, one at a time, until they are fully
seated. This should be done quickly, in one con­tinuous motion, to prevent the bearings from cool­ing and sticking on the shaft.

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

MAINTENANCE & REPAIR PAGE E − 17

PA SERIESOM−06344

sleeve and a press to reposition the bearings
against the shaft shoulders.

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

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.

Install the thrust washer (23) and secure the out­board bearing (18) to the shaft with the retaining
ring (21).

Apply a light coating of oil to the lips of the inboard
oil seals (22A and 22B) and press them into the in­termediate with the lips positioned as shown in Fig­ure 4. Press the oil seals into the housing until they
are centered in the intermediate bore.

Securing Intermediate And Drive Assembly To
Engine

(Figure 7)

Install the shaft key (19, Figure 4) in the shaft key­way. Position the flexible portion of the coupling as­sembly (1) on the shaft as shown in Figure 7.

NOTE

The flexible portion of the coupling must be proper­ly positioned on the shaft. The heads of the caps­crews in the center of the coupling must be posi-
tioned away from the pump end of the shaft.

Align the keyway in the bushing (2) with the shaft
key, and slide it onto the shaft to the dimension
shown in Figure 7. Rotate the flexible portion of the
coupling until the tapped holes for the two set­screws align with those in the bushing, and install
the setscrews.

Slide the shaft and assembled bearings into the in­termediate bore until the retaining ring on the out­board bearing (18) is fully seated against the inter­mediate. Use caution not to damage the lip seals
(22A and 22B) on the shaft threads.

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

Apply a light coating of oil to the lip of the outboard
oil seal (22) and press it into the bearing cover (17)
with the lip positioned as shown in Figure 4. The
face of the oil seal should be just flush with the
outer face of the bearing cover.

Install the bearing cover gasket (24) and secure
the bearing cover to the intermediate with the hard­ware (15 and 16). Be careful not to damage the lip
of the oil seal (22) on the shaft keyway.

Lubricate the bearings as indicated in LUBRICA-
TION at the end of this section.

Make certain that the flexible portion of the
coupling is mounted as shown in Figure 7.
This is critical. If the coupling is not prop­erly positioned on the shaft, the coupling
parts may not fully engage, or a pre-load
condition can cause premature bearing
failure.

The coupling must be positioned 0.54
inches (13,7 mm) from the end of the shaft.
This will allow the two portions of the cou­pling to fully engage when the drive flange
is secured to the bellhousing, without pre­loading the bearings.

With the flexible portion of the coupling and the
bushing properly positioned on the shaft, tighten
the two setscrews in an alternating sequence until
the bushing and coupling are fully secured. Torque
the setscrews to 23.3 ft. lbs. (280 in. lbs. or 3,2 m.
kg.).

If the complete coupling assembly is being re­placed, apply ‘Loctite Retaining Compound No.
242’ or equivalent to the threads of the hardware (3
and 4), and secure the outer ring of the coupling to
the flywheel by torquing the hardware to 45 ft. lbs.
(540 in. lbs. or 6,2 m. kg.).

MAINTENANCE & REPAIRPAGE E − 18

PA SERIES

OM−06344

Using a suitable lifting device, position the as­sembled rotating assembly and coupling so the
flexible portion of the coupling seats inside the out­er ring attached to the flywheel.

NOTE

To ease installation, lightly lubricate the rubber por­tion of the coupling with a non-petroleum based
lubricant such as vegetable oil or glycerin, or a sili­con-based lubricant such as WD40" or equivalent.
Do not use petroleum-based lubricants, or any oth­er substance which may soften or otherwise dam­age the rubber.

Secure the intermediate to the bellhousing with the
previously removed hardware (5 and 6). Make sure
the intermediate guards (not shown) are installed
over the openings in the intermediate.

Seal Reassembly and Installation

(Figures 4 and 9)

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

precautions printed on solvent contain­ers.

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

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

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

If a replacement seal is being used, remove it from
the container and inspect the precision finished
faces to ensure that they are free of any foreign
matter.

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

To ease installation of the seal, lubricate the O­rings and bellows with water or a very small
amount of oil, and apply a drop of light lubricating
oil on the finished faces. Assemble the seal as fol­lows, (see Figure 9).

MAINTENANCE & REPAIR PAGE E − 19

IMPELLER

SHIMS

IMPELLER

SHAFT

IMPELLER

SPRING

RETAINER

PA SERIESOM−06344

O-RING

STATIONARY

SEAT

STATIONARY

ELEMENT

ROTATING

ELEMENT

BELLOWS

Figure 9. Seal Assembly

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

Lubricate the stationary seat O-ring with water or
light oil. Press the stationary seat and element into
the seal plate (6) until fully seated.

Position the seal plate over the shaft and temporari­ly secure it to the intermediate (14) with four
1/2−UNC x 2-inch long capscrews and hex nuts
(not supplied). Be careful not to damage the sta­tionary portion of the seal on the shaft threads.

SEAL PLATE

Impeller Installation And Adjustment

(Figure 4)

Inspect the impeller (2) and replace it if cracked or
badly worn.

The shaft and impeller threads must be
completely clean before reinstalling the im­peller. Even the slightest amount of dirt on
the threads can cause the impeller to seize
to the shaft, making future removal difficult
or impossible without damage to the im­peller or shaft.

Lubricate the shaft with a small amount of light oil
and slide the rotating subassembly (consisting of
rotating element, bellows and retainer), onto the
shaft until the seal faces touch.

Install the seal spring. Lubricate the seal as indi­cated in LUBRICATION after the impeller is in­stalled.

Install the same thickness of impeller adjusting
shims (4) as previously removed and screw the im­peller assembly onto the shaft until tight, making
sure the seal spring seats squarely over the shoul­der on the back of the impeller.

NOTE

At the slightest sign of binding, immediately back

MAINTENANCE & REPAIRPAGE E − 20

PA SERIES

OM−06344

the impeller off, and check the threads for dirt. Do
not try to force the impeller onto the shaft.

A clearance of .025 to .040 inch (0,64 to 1,02 mm)
between the impeller and the seal plate is neces­sary for maximum pump efficiency. Measure this
clearance, and add or remove impeller adjusting
shims as required.

Pump Casing Installation

(Figure 4)

Remove the four capscrews and hex nuts (not sup­plied) securing the seal plate to the intermediate.
With the volute casing (1) resting on a flat surface
and the suction opening facing down, secure a
suitable lifting device to the bellhousing mounting
holes in the intermediate (14).

Install a new gasket (29) over the volute studs (8).
Use the lifting device to carefully lower the rotating
portion of the pump over the volute studs until fully
seated against the volute.

NOTE

Position the rotating portion of the pump over the
volute studs so the air vent (13) is properly oriented
with the volute casing.

the hardware can deform the wear ring, resulting in
uneven clearance with the impeller.

Slide the assembled suction head and wear ring
into the pump casing and secure the suction head
to the pump casing with the hardware (9 and 10).

Reach through the suction opening and use a feel­er gauge to measure the gap between the wear
ring and the impeller. This clearance should be be­tween .010 and .020 inch (to mm).

To adjust the clearance, loosen the hardware (15
and 16) securing the wear ring to the suction head.
Loosen the jam nuts (33) and turn the adjusting
screws (32) clockwise in an alternating pattern un­til the proper clearance is achieved. When the
clearance is correct, tighten the jam nuts and the
securing hardware.

Suction Spool Flange Installation

(Figure 3)

Apply a light coating of grease to one side of the
suction spool flange gasket (4) and use the grease
to secure the gasket to the pump casing flange.

Use a suitable lifting device to position the suction
spool flange (8) against the gasket and suction
head (34, Figure 4). Secure the flange to the pump
casing with the hardware (5, 6 and 7).

Secure the volute casing to the intermediate with
the hardware (9 and 10).

Suction Head And Wear Ring Installation And
Adjustment

(Figure 4)

Lubricate the O-rings (7 and 31) with grease and
install them in the grooves in the wear ring (35).

Make sure the adjusting screws (32) are fully re­tracted, and press the wear ring into the suction
head until fully seated and the mounting holes in
the wear ring align with the mounting holes in the
suction head. Secure the wear ring to the suction
head with the hardware (35 and 36). Do not over­tighten the mounting hardware. Over-tightening

MAINTENANCE & REPAIR PAGE E − 21

Secure the flange to the base with the previously
removed hardware (not shown).

Discharge Check Valve Assembly And
Installation

(Figure 3)

The flapper and cover gasket are the only service­able parts of the check valve. If the flapper requires
replacement, remove the hardware securing the
cover and gasket. Separate the valve cap and re­place the flapper.

Install the cover gasket and secure the cover with
the previously removed hardware.

Install the discharge check valve assembly in the
discharge piping.

PA SERIESOM−06344

LUBRICATION

Seal Assembly

(Figure 4)

Fill the seal cavity through the hole for the vented
plug (11) with SAE No. 30 non-detergent oil to the
line on the sight gauge (25). Check the oil level reg­ularly and refill as required. When lubricating a dry
seal cavity, add approximately approximately 112
U.S. ounces (3,3 liters) of oil to level indicated.

NOTE

The white reflector in the sight gauge must be posi­tioned horizontally to provide proper drainage.

Bearings

(Figure 4)

The bearing housing was fully lubricated when
shipped from the factory. Check the oil level regu­larly through the sight gauge (25A) and maintain it
at the midpoint of the gauge. When lubrication is
required, remove the air vent (13) and add SAE No.
30 non-detergent oil through the opening. When
lubricating a dry (overhauled) bearing housing, fill
the bearing cavity with approximately 18 ounces
(532 ml) of oil. Clean and reinstall the air vent. Do
not over-lubricate. Over-lubrication can cause the

bearings to over-heat, resulting in premature bear­ing failure.

NOTE

The white reflector in the sight gauges must be po­sitioned horizontally to provide proper drainage.

Under normal conditions, drain the bearing hous­ing once each year and refill with clean oil. Change
the oil more frequently if the pump is operated con­tinuously or installed in an environment with rapid
temperature change.

Monitor the condition of the bearing lubri­cant regularly for evidence of rust or mois­ture condensation. This is especially im­portant 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.

Engine

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

MAINTENANCE & REPAIRPAGE E − 22

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