Page 1
ACDEU
OM-06469-01
February 21, 2012
Rev. A 03‐28‐13
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
WITH PARTS LIST
PAH SERIES PUMP
MODEL
PAH3A60-6068H
THE GORMAN‐RUPP COMPANY MANSFIELD, OHIO
GORMAN‐RUPP OF CANADA LIMITED ST. THOMAS, ONTARIO, CANADA Printed in U.S.A
www.grpumps.com.
2012 The Gorman‐Rupp Company
Page 2
Register your new
Gorman‐Rupp pump online at
www.grpumps.com
Valid serial number and e‐mail address required.
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:
Page 3
TABLE OF CONTENTS
INTRODUCTION PAGE I - 1.................................................
SAFETY ‐ SECTION A PAGE A - 1............................................
INSTALLATION - SECTION B PAGE B - 1....................................
Pump Dimensions PAGE B - 1.....................................................
PREINSTALLATION INSPECTION PAGE B - 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.....................................................
Priming PAGE C - 2...............................................................
ROUTINE OPERATION PAGE C - 3.....................................................
OPERATION IN EXTREME HEAT PAGE C - 3............................................
OPERATIONAL CHECKS PAGE C - 3...................................................
Leakage PAGE C - 3..............................................................
Pump Vacuum Check PAGE C - 3..................................................
Liquid Temperature And Overheating PAGE C - 3.....................................
Strainer Check PAGE C - 4.........................................................
STOPPING PAGE C - 4................................................................
Manual Stopping PAGE C - 4.......................................................
Automatic Stopping PAGE C - 4....................................................
Safety Shutdown System PAGE C - 4...............................................
i
Page 4
TABLE OF CONTENTS
(continued)
PERIODIC CHECKS PAGE C - 5.......................................................
Seal Cavity and Bearing Lubrication PAGE C - 5......................................
Bearing Temperature Check PAGE C - 5.............................................
Engine Fuel Filter PAGE C - 5......................................................
Engine Oil PAGE C - 5.............................................................
Air Compressor PAGE C - 5........................................................
Air Compressor Drive Belt PAGE C - 5...............................................
COLD WEATHER PRESERVATION PAGE C - 5...........................................
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..........................................................
Power Unit Kit PAGE E - 5.........................................................
Pump End Assembly PAGE E - 9...................................................
Pump End Assembly PAGE E - 11...................................................
Repair Rotating Assembly PAGE E - 13...............................................
Priming Chamber Kit PAGE E - 14...................................................
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 E - 18..............................
Discharge Check Valve Removal and Disassembly PAGE E - 18.........................
Suction Head and Wear Ring Removal PAGE E - 18....................................
Pump Casing Removal PAGE E - 19.................................................
Draining Oil From Seal Cavity PAGE E - 19............................................
Impeller Removal PAGE E - 19......................................................
Seal Removal PAGE E - 19..........................................................
Separating Pump And Drive Assembly From Engine PAGE E - 19........................
Shaft and Bearing Removal and Disassembly PAGE E - 20.............................
Shaft and Bearing Reassembly and Installation PAGE E - 21............................
Securing Pedestal And Drive Assembly To Engine PAGE E - 22..........................
Seal Reassembly and Installation PAGE E - 23........................................
Impeller Installation And Adjustment PAGE E - 24......................................
Pump Casing Installation PAGE E - 24................................................
Suction Head and Wear Ring Installation PAGE E - 24..................................
Discharge Check Valve Reassembly And Installation PAGE E - 24.......................
Priming Chamber Assembly And Installation PAGE E - 24...............................
LUBRICATION PAGE E - 25.............................................................
Seal Assembly PAGE E - 25.........................................................
Bearings PAGE E - 25..............................................................
Engine PAGE E - 25................................................................
ii
Page 5
INTRODUCTION
OM-06469PAH 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 PAH Series, priming‐assisted cen
trifugal model. The unit is designed for handling
non‐volatile, non‐flammable liquids containing
specified entrained solids. The basic material of
construction is ductile iron, with alloy steel shaft
and ductile iron wear ring.
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: (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 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.
For information or technical assistance on the en
gine, contact the engine manufacturer's local
dealer or representative.
PAGE I - 1INTRODUCTION
Page 6
PAH SERIES
SAFETY ‐ SECTION A
This information applies to Prime Aire
Series pumps. Refer to the manual ac
companying the engine before attempt
ing to begin operation.
Because pump installations are seldom
identical, this manual cannot possibly
provide detailed instructions and pre
cautions for each specific application.
Therefore, it is the owner/installer's re
sponsibility to ensure that applications
not addressed in this manual are per
formed only after establishing that nei
ther operator safety nor pump integrity
are compromised by the installation.
r
forming any maintenance. 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.
OM-06469
Before attempting to open or service the
pump:
1. Familiarize yourself with this man
ual.
2. Shut down the engine and discon
nect 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 open
ing any covers, plates, or plugs.
5. Close the suction and discharge
valves.
6. Vent the pump slowly and cau
tiously.
7. Drain the pump.
This pump is equipped with an automat
ic starting system, and is subject to au
tomatic restart. Keep hands and cloth
ing away from the unit to prevent injury
during automatic operation. Disconnect
the positive battery cable before per
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.
Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam
age to equipment. Attach lifting equip
ment 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 pip
ing must be removed from the pump be
fore lifting.
After the pump has been installed, make
certain that the pump and all piping or
PAGE A - 1SAFETY
Page 7
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
ture or explode. Momentary closure of a
discharge valve is acceptable only
when required for startup or shutdown
procedures.
PAH SERIESOM-06469
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.
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.
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.
This pump may be used to handle mate
rials which could cause illness through
direct exposure or emitted fumes. Wear
adequate protective clothing when
working on the pump or piping.
Fuel used by internal combustion en
gines presents an extreme explosion
and fire hazard. Make certain that all
fuel lines are securely connected and
free of leaks. Never refuel a hot or run
ning engine. Avoid overfilling the fuel
tank. Always use the correct type of fuel.
Never tamper with the governor to gain
more power. The governor establishes
safe operating limits that should not be
exceeded. Refer to the performance
curve on page E-1 for the maximum
continuous operating speed for this
pump.
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.
PAGE A - 2 SAFETY
The engine used on this unit is equipped
with an exhaust filter which reduces the
amount of nitrogen oxide produced while
burning away particulate matter that would
Page 8
PAH SERIES
OM-06469
otherwise be expelled into the atmo
sphere. The resultant soot and ash are
trapped in the filter. The Engine Control
Unit (ECU) will cause the filter to perform a
self‐cleaning function (regeneration) peri
odically to keep the soot collected by the
filter at manageable levels.
Because the operator can choose to post
pone the regeneration process, the ECU
could eventually force a regeneration, re
sulting in loss of performance or even a to
tal shut down of the engine. Refer to the
manual accompanying the engine for a de
tailed explanation of the regeneration pro
cess and the indicator symbols that will
display on the Engine Control Unit. Follow
all of the instructions in the engine manual
to ensure uninterrupted operation of the
engine.
PAGE A - 3SAFETY
Page 9
PAH SERIES OM-06469
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
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 dimen
sions of this pump.
Figure 1. Pump Model PAH3A60-6068H
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.
PAGE B - 1INSTALLATION
Page 10
OM-06469 PAH 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 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.
d. Check levels and lubricate as necessary. Re
fer to LUBRICATION in the Maintenance and
Repair Manual and perform duties as in
structed.
e. If the pump has been stored for more than 12
months, some of the components or lubri
cants may have exceeded their maximum
shelf life. These must be inspected or re
placed to ensure maximum pump service.
If the maximum shelf life has been exceeded, or if
anything appears to be abnormal, contact your
Gorman‐Rupp distributor or the factory to deter
mine the repair or updating policy. Do not put the
pump into service until appropriate action has
been taken.
POSITIONING PUMP
Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam
age to equipment. Attach lifting equip
ment 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 pip
ing 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 charg
ing instructions.
Before installing the battery, clean the positive and
negative cable connectors, and the battery termi
nals. Secure the battery by tightening the
holddown brackets. The terminals and clamps
may be coated with petroleum jelly to retard corro
sion. 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 mount
ing 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 lubri
cation and fuel supply to the engine.
If the pump has been mounted on a moveable
base, make certain the base is stationary by setting
Page 11
PAH SERIES OM-06469
the brake and blocking the wheels before attempt
ing to operate the pump.
If the pump has been mounted on a mov
able 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 1/2 inch
(12,7 mm) diameter spherical solids.
PAGE B - 3INSTALLATION
Page 12
OM-06469 PAH 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 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).
PAGE B - 4 INSTALLATION
Page 13
PAH SERIES OM-06469
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.
ALIGNMENT
The alignment of the pump, air compressor and
engine is critical for trouble‐free mechanical opera
tion. 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 installa
tion details for the liquid level sensing system pro
vided with your pump.
PAGE B - 5INSTALLATION
Page 14
OM-06469 PAH 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 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 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
Page 15
PAH SERIES
OM-06469
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 educ
tor 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 endan
ger personnel as a result of pump fail
ure.
Pump speed and operating condition
points must be within the continuous per
formance range shown on the perfor
mance curve in Section E on page E-1.
PRIMING
Install the pump and piping as described in IN
STALLATION. Make sure that the piping connec
tions are tight, and that the pump is securely
mounted. Check that the pump is properly lubri
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. Dis
connect the positive battery cable be
fore performing any maintenance. Fail
ure to do so may result in serious per
sonal injury.
Consult the engine operations manual before at
tempting to start the unit.
Manual Starting
On initial start‐up, set the engine speed at the half‐
throttle position. Turn the key switch on the control
OPERATION PAGE C - 1
Page 16
OM-06469 PAH SERIES
box to the “MANUAL” position, then press and hold
the “ENTER” button until the engine starts.
Pump speed and operating condition
points must be within the continuous per
formance range shown on the curve on
Page E‐1.
Automatic Starting
With the float system installed, follow the proce
dures outlined for manual starting and adjust the
throttle to the desired flow rate. Turn the key switch
to “OFF”, then move it to the “AUTO” position.
The pump will start automatically when the liquid
level in the sump or wet well increases and the
float(s) rise to the “on” position. An alarm will sound
and the control box will begin a countdown display
before the unit starts. When the liquid is sufficiently
pumped down, the unit will automatically shut
down.
If full priming is not achieved, the discharge check
valve may be malfunctioning. If this occurs, shut
down the pump and consult the separate Mainte
nance and Repair manual for further details.
Routine Operation
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.
Adjust the engine speed to achieve the desired
output. Do not exceed the factory set engine speed
and system operating pressure. Do not operate
below the recommended operating speed (if appli
cable).
The unit can be stopped while in the “AUTO” mode
by moving the key switch to the “OFF” position.
NOTE
If the key switch is moved to the “OFF” position
while in the “AUTO” mode, the engine will stop.
However, the auto‐start process will continue as
soon as the key switch is moved back to the “AUTO”
position.
The control panel is equipped with high oil temper
ature, low oil pressure, engine overspeed and en
gine overcrank safety shutdowns. If any of these
problems occur, the engine will not start. When the
problem is corrected, turn the key switch to the
“OFF” position to reset the control.
Priming
The pump will begin to prime upon startup. The air
in the suction line will be discharged from the educ
tor discharge line. Complete priming is indicated
by a positive discharge pressure reading.
Never tamper with the governor to gain
more power. The governor establishes
safe operating limits that should not be
exceeded. The maximum continuous
operating speed for this pump is 2100
RPM.
The engine used on this unit is equipped
with an exhaust filter which reduces the
amount of nitrogen oxide produced while
burning away particulate matter that would
otherwise be expelled into the atmo
sphere. The resultant soot and ash are
trapped in the filter. The Engine Control
Unit (ECU) will cause the filter to perform a
self‐cleaning function (regeneration) peri
odically to keep the soot collected by the
filter at manageable levels.
Because the operator can choose to post
pone the regeneration process, the ECU
OPERATIONPAGE C - 2
Page 17
PAH SERIES
OM-06469
could eventually force a regeneration, re
sulting in loss of performance or even a to
tal shut down of the engine. Refer to the
manual accompanying the engine for a de
tailed explanation of the regeneration pro
cess and the indicator symbols that will
display on the Engine Control Unit. Follow
all of the instructions in the engine manual
to ensure uninterrupted operation of the
engine.
Operation In Extreme Heat
The safety shutdown system will automatically
stop the unit if engine operating temperature ex
ceeds design limits. If engine over‐temperature
shutdown occurs, allow the unit to cool before re
starting.
If engine overheating continues, check the engine
lubricant level and viscosity. Consult the engine
operation manual for the recommended lubricant
for operation in extreme heat.
If the unit is being operated in the automatic mode,
adjust the float(s) to allow shorter run and longer
cooling periods, if possible.
Pump Vacuum Check
Read the vacuum gauge with the pump primed
and at operation speed. Shut off the pump. The
vacuum gauge reading will immediately drop pro
portionate to static suction lift, and should then sta
bilize. If the vacuum reading falls off rapidly after
stabilization, an air leak exists. Before checking for
the source of the leak, check the point of installa
tion of the vacuum gauge.
Liquid Temperature And Overheating
The maximum liquid temperature for this pump is
160F (71C). Do not apply it at a higher operating
temperature.
Overheating can occur if operated with the valves
in the suction or discharge lines closed. Operating
against closed valves could bring the liquid to a
boil, build pressure, and cause the pump to rup
ture or explode. If overheating occurs, stop the
pump immediately and allow it to completely cool
before servicing it. Approach any over‐heated
pump cautiously.
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. Dis
connect the battery before performing
any maintenance. Failure to do so may
result in serious personal injury.
OPERATIONAL CHECKS
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 effi
ciency.
Allow an over‐heated pump to com
pletely cool before servicing. Do not re
move plates, covers, gauges, or fittings
from an overheated pump. Liquid within
the pump can reach boiling tempera
tures, and vapor pressure within the
pump can cause parts being disen
gaged to be ejected with great force. Af
ter the pump 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.
Strainer Check
Check the strainer regularly, and clean it as neces
sary. The strainer should also be checked if pump
flow rate begins to drop. Monitor and record the
vacuum suction gauge readings regularly to detect
strainer blockage.
OPERATION PAGE C - 3
Page 18
OM-06469 PAH SERIES
Never introduce air or steam pressure into the
pump casing or piping to remove a blockage. This
could result in personal injury or damage to the
equipment. If backflushing is absolutely neces
sary, liquid pressure must be limited to 50% of the
maximum permissible operating pressure shown
on the pump performance curve.
STOPPING
Manual 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.
In the manual mode, reduce the throttle speed
slowly, and allow the engine to idle briefly before
switching the engine key switch to `OFF'.
2. If the engine oil pressure drops below design
limits.
3. If the engine fails to start within a pre‐set peri
od of time.
4. If the engine speed exceeds the safe operat
ing range.
5. If the engine fan belt breaks.
Lights on the control panel will indicate which of the
safety features has caused the engine to shut
down.
Should any of the safety features cause the engine
to shut down, the cause must be determined and
corrected before putting the unit back into service.
The engine will not restart until the key switch has
been returned to the `OFF' position for at least 10
seconds.
All safety shutdown features are pre‐set at the fac
tory for optimum performance and safety; do not
attempt to adjust these settings.
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 igni
tion and remove the key to ensure that the pump
will remain inoperative.
Automatic Stopping
In the automatic mode, the pump will stop when
the liquid in the wet well or sump lowers and acti
vates the “Off” float switch(s). The pump will restart
automatically when the liquid rises and activates
the “On” float switch(s).
Safety Shutdown System
The unit is equipped with a safety system to auto
matically shut down the engine under certain con
ditions. The engine will automatically shut down:
1. If the engine exceeds its safe operating tem
perature.
Never disconnect any of the safety shut
down features; this will void the warran
ty and could result in serious damage to
the unit and/or injury to personnel. Safe
ty shutdown features are pre‐set at the
factory; do not attempt to adjust any of
the settings. Determine the cause of
shutdown before putting the unit back
into service. Consult the factory for ad
ditional information.
PERIODIC CHECKS
Seal Cavity And Bearing Lubrication
Both the seal and bearing cavities were fully lubri
cated at the factory. Check the lubrication levels
before startup, and regularly thereafter as indi
cated in Section E, Maintenance and Repair.
When lubrication is required, use only SAE No. 30
non‐detergent oil.
OPERATIONPAGE C - 4
Page 19
PAH SERIES
OM-06469
Bearing Temperature Check
Bearings normally run at higher than ambient tem
peratures because of heat generated by friction.
Temperatures up to 160F (71C) are considered
normal for bearings, and they can operate safely to
at least 180F (82C).
Checking bearing temperatures by hand is inaccu
rate. Bearing temperatures can be measured ac
curately by placing a contact‐type thermometer
against the housing. Record this temperature for
future reference.
A sudden increase in bearing temperatures is a
warning that the bearings are at the point of failing
to operate properly. Make certain that the bearing
lubricant is of the proper viscosity and at the cor
rect level (see LUBRICATION in Section E, Main
tenance and Repair). Bearing overheating can
also be caused by shaft misalignment and/or ex
cessive vibration.
Engine Oil
The engine was lubricated for test at the factory.
However, always check the lubrication level before
startup.
Consult the manual accompanying the engine,
and change the oil filter periodically as indicated. If
operated under extremely dusty conditions,
change the filter more frequently.
Air Compressor
The air compressor was lubricated for test at the
factory. However, always check the lubrication lev
el before startup.
Consult the manual accompanying the air com
pressor and preform all duties and checks as indi
cated.
COLD WEATHER PRESERVATION
When pumps are first started, the bearings may
seem to run at temperatures above normal. Con
tinued operation should bring the temperatures
down to normal levels.
Engine Fuel Filter
Consult the manual accompanying the engine,
and change the fuel filter periodically as indicated.
If operated under extremely dusty and/or humid
conditions, change the filter more frequently. Irreg
ular performance and loss of power usually indi
cate a dirty fuel filter.
In below freezing conditions, drain the pump to
prevent damage from freezing. Also, clean out any
solids by flushing with a hose. Operate the pump
for approximately one minute; this will remove any
remaining liquid that could freeze the pump rotat
ing parts. If the pump will be idle for more than a
few hours, or if it has been pumping liquids con
taining a large amount of solids, drain the pump,
and flush it thoroughly with clean water. To prevent
large solids from clogging the drain port and pre
venting the pump from completely draining, insert
a rod or stiff wire in the drain port, and agitate the
liquid during the draining process. Clean out any
remaining solids by flushing with a hose.
OPERATION PAGE C - 5
Page 20
PAH SERIES
OM-06469
TROUBLESHOOTING - SECTION D
Review all SAFETY information in Section A.
Before attempting to open or service the
pump:
1. Familiarize yourself with this man
ual.
2. Shut down the engine and discon
nect the positive battery cable to
ensure that the pump will remain
inoperative.
3. Allow the pump to completely cool
if overheated.
4. Check the temperature before
opening any covers, plates, or
plugs.
5. Close the suction and discharge
valves.
6. Vent the pump slowly and cau
tiously.
7. Drain the pump.
This pump is equipped with an automat
ic starting system, and is subject to au
tomatic restart. Keep hands and cloth
ing away from the unit to prevent injury
during automatic operation. Disconnect
the positive battery cable before per
forming any maintenance. Failure to do
so may result in serious personal injury.
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PUMP FAILS TO
PRIME
PUMP STOPS OR
FAILS TO DELIVER
RATED FLOW OR
PRESSURE
Discharge check valve contami
nated, damaged, or unable to seat.
Air leak in suction line. Correct leak.
Lining of suction hose collapsed. Replace suction hose.
Leaking or worn seal or pump gasket. Check pump vacuum. Replace
Suction lift or discharge head too high. Check piping installation and install
Air compressor damaged or belts bro
ken.
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
Page 21
OM-06469
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PAH 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 neces
sary.
Check and clean check valve.
Check installation and correct
submergence as needed.
Replace worn or damaged parts.
Check that impeller is properly
centered and rotates freely.
Free impeller of debris.Impeller clogged.
Install bypass line.
Measure lift w/vacuum gauge. Re
duce lift and/or friction losses in
suction line.
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 in
crease flow rate, and run engine at
maximum governed speed.
Clean valve.
Dilute if possible.
losses in suction line. Record vac
uum and pressure gauge readings
and consult local representative or
factory.
Locate and eliminate source of air
bubble.
Secure mounting hardware.Pump or drive not securely mounted.
Clean out debris; replace damaged
parts.
TROUBLESHOOTINGPAGE D - 2
Page 22
PAH SERIES
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
OM-06469
BEARINGS RUN
TOO HOT
Bearing temperature is high, but
within limits.
Low or incorrect lubricant.
Suction and discharge lines not prop
erly supported.
Excessive tension on drive belt.
PREVENTIVE MAINTENANCE
Since pump applications are seldom identical, and
pump wear is directly affected by such things as
the abrasive qualities, pressure and temperature
of the liquid being pumped, this section is intended
only to provide general recommendations and
practices for preventive maintenance. Regardless
of the application however, following a routine pre
ventive maintenance schedule will help assure
trouble‐free performance and long life from your
Gorman‐Rupp pump. For specific questions con
cerning your application, contact your Gorman‐
Rupp distributor or the Gorman‐Rupp Company.
Record keeping is an essential component of a
good preventive maintenance program. Changes
in suction and discharge gauge readings (if so
Check bearing temperature regu
larly to monitor any increase.
Check for proper type and level of
lubricant.
Check piping installation for proper
support.
Align drive properly.Drive misaligned.
Check belt tension. Adjust as
required.
equipped) between regularly scheduled inspec
tions can indicate problems that can be corrected
before system damage or catastrophic failure oc
curs. The appearance of wearing parts should also
be documented at each inspection for comparison
as well. Also, if records indicate that a certain part
(such as the seal) fails at approximately the same
duty cycle, the part can be checked and replaced
before failure occurs, reducing unscheduled down
time.
For new applications, a first inspection of wearing
parts at 250 hours will give insight into the wear rate
for your particular application. Subsequent inspec
tions should be performed at the intervals shown
on the chart below. Critical applications should be
inspected more frequently.
TROUBLESHOOTING PAGE D - 3
Page 23
OM-06469
PAH SERIES
Preventive Maintenance Schedule
Service Interval*
Item
General Condition (Temperature, Unusual
Noises or Vibrations, Cracks, Leaks,
Loose Hardware, Etc.) I
Pump Performance (Gauges, Speed, Flow) I
Bearing Lubrication I R
Seal Lubrication (And Packing Adjustment,
If So Equipped) I R
V‐Belts (If So Equipped) I
Air Release Valve Plunger Rod (If So Equipped) I C
Front Impeller Clearance (Wear Plate) I
Rear Impeller Clearance (Seal Plate) I
Check Valve I
Pressure Relief Valve (If So Equipped) C
Pump and Driver Alignment I
Shaft Deflection I
Bearings I
Bearing Housing I
Piping I
Driver Lubrication - See Mfgr's Literature
Daily Weekly Monthly Semi‐
Annually
Annually
Legend:
I = Inspect, Clean, Adjust, Repair or Replace as Necessary
C = Clean
R = Replace
* Service interval based on an intermittent duty cycle equal to approximately 4000 hours annually.
Adjust schedule as required for lower or higher duty cycles or extreme operating conditions.
TROUBLESHOOTINGPAGE D - 4
Page 24
PAH SERIES
OM-06469
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 PAH3A60-6068H
Based on 70F (21C) clear water at sea level
with minimum suction lift. Since pump installations
are seldom identical, your performance may be dif
ferent due to such factors as viscosity, specific
gravity, elevation, temperature, and impeller trim.
Contact the Gorman‐Rupp Company to verify per
formance or part numbers.
Pump speed and operating condition
If your pump serial number is followed by an “N”,
your pump is NOT a standard production model.
MAINTENANCE & REPAIR PAGE E - 1
points must be within the continuous per
formance range shown on the curve.
Page 25
OM-06469 PAH SERIES
PARTS PAGE
ILLUSTRATION
Figure 1. Pump Model PAH3A60-6068H
MAINTENANCE & REPAIRPAGE E - 2
Page 26
PAH SERIES
OM-06469
Pump Model PAH3A60-6068H
PARTS LIST
(From S/N 1522805 Up)
ITEM
NO.
1 POWER UNIT 46143-131 --- 1
2 PAH3A60-( SAE 3/11.5 ) 46133-338 --- 1
3 PUMP MOUNTING KIT 48157-055 --- 1
4 BATTERY SEE OPTIONS --- REF
NOT SHOWN:
OPTIONAL:
PART NAME
G‐R DECAL GR-06 --- 4
PRIME AIRE PLUS DECAL 38812-098 --- 2
PRIME AIRE PLUS DECAL 38812-099 --- 2
INSTRUCTION TAG 38817-085 --- 1
CAUTION DECAL 2613FJ --- 1
BATTERY 29331-506 --- 1
PART
NUMBER
MAT'L
CODE
QTY
MAINTENANCE & REPAIR PAGE E - 3
Page 27
OM-06469 PAH SERIES
ILLUSTRATION
Figure 2. 46143-131 Power Unit Kit
MAINTENANCE & REPAIRPAGE E - 4
Page 28
PAH SERIES
PARTS LIST
46143-131 Power Unit Kit
ITEM
PART NAME PART
NO.
1 J.D. 6068H ENGINE 29224-336 --- 1
2 LIFTING BAIL KIT 48274-805 --- 1
3 FUEL PICKUP 29332-145 --- 2
4 HOSE BARB FITTING 26523-386 --- 2
5 3/8” ID X 36” LG HOSE 18513-302 --- 1
6 FUEL GAUGE 29332-135 --- 1
7 3/8” ID X 28” LG HOSE 18513-302 --- 1
8 BASE/FUEL TANK ASSY 41553-008 24150 1
9 BATTERY BOX ASSY 42432-003 --- 1
10 NEG BATT CABLE ASSY 47311-215 --- 1
11 POS BATT CABLE ASSY 47311-214 --- 1
12 CONNECTOR S1598 --- 1
13 HOSE BARB FTG 26523-047 --- 1
14 1/2” ID X 60” LG HOSE 18513-113 --- 1
15 LOCK WASHER J10 15991 4
16 HEX NUT D10 15991 4
17 HEX HEAD CAP SCREW B1007 15991 4
18 HOSE BARB FITTING 26523-383 --- 1
19 HOSE CLAMP 26518-641 --- 3
20 MALE ELBOW S1707 --- 1
NUMBER
MAT'L
CODE
QTY ITEM
NO.
21 HOSE BARB FTG 26523-015 --- 1
22 HOSE BARB FITTING 26523-446 --- 1
23 CHECK VALVE 26641-092 --- 1
24 PIPE ELBOW R16 15079 1
25 RED COUPLING AE1608 15079 1
26 VENTURI 26817-001 --- 1
27 PIPE UNION AH12 11999 1
28 REDUCER PIPE BUSHING AP1208 15079 1
29 VENTURI MTG BRACKET 41888-201 24150 1
30 PIPE TEE U08 11999 1
31 PRESSURE RELIEF VALVE 26662-028 --- 1
32 CONNECTOR 26351-065 --- 1
33 HOSE ASSEMBLY 46341-426 --- 1
34 CONTROL PANEL KIT 48122-544 --- 1
NOT SHOWN:
OM-06469
PART NAME PART
NUMBER
ENGINE START UP TAG 38816-269 --- 1
WARNING DECAL 38816-203 --- 4
INSTRUCTION DECAL 38818-144 --- 1
WARNING DECAL 38816-132 --- 2
FLOAT SWITCH KIT 48312-980 --- 1
MAT'L
CODE
QTY
MAINTENANCE & REPAIR PAGE E - 5
Page 29
OM-06469 PAH SERIES
ILLUSTRATION
Figure 3. 46133-338 Pump End Assembly
MAINTENANCE & REPAIRPAGE E - 6
Page 30
PAH SERIES
OM-06469
46133-338 Pump End Assembly
PARTS LIST
ITEM
NO.
1 CHECK VALVE KIT 48274-002 --- 1
2 63P60-(SAE 3/11.5) 46133-337 --- 1
3 STUD C1213 15991 8
4 GASKET 25113-036 --- 1
5 PRIMING CHAMBER KIT 48275-005 --- 1
6 6” SUCTION SPOOL 38644-814 10000 1
7 GASKET 25113-034 --- 1
8 4” BLIND FLANGE ASSEMBLY 42111-358 --- 1
9 LOCK WASHER J10 15991 8
10 HEX HEAD CAP SCREW B1007 15991 8
11 HEX NUT D12 15991 8
12 LOCK WASHER J12 15991 8
13 PIPE PLUG P04 15079 1
NOT SHOWN:
PART NAME
-CHECK VALVE 26642-123 --- 1
-COVER GASKET 26688-012 --- 1
-FLAPPER 26688-011 --- 1
-FLANGE GASKET 25113-033 --- 1
SUCTION STICKER 6588AG --- 1
DISCHARGE STICKER 6588BJ --- 1
WARNING DECAL 2613FE --- 1
G‐R DECAL GR-06 --- 1
LUBRICATION DECAL 11421A --- 1
OIL LEVEL DECAL 38816-123 --- 1
PRIME AIRE PLUS DECAL 38812-099 --- 1
6” STRAINER 7823A 24000 1
DRIVE ASSEMBLY 44162-165 --- 1
NAME PLATE 38818-156 13000 1
DRIVE SCREW BM#04-03 17000 4
PART
NUMBER
MAT'L
CODE
QTY
INDICATES PARTS RECOMMENDED FOR STOCK
MAINTENANCE & REPAIR PAGE E - 7
Page 31
OM-06469 PAH SERIES
ILLUSTRATION
Figure 4. 46133-337 Pump End Assembly
MAINTENANCE & REPAIRPAGE E - 8
Page 32
PAH SERIES
OM-06469
PARTS LIST
46133-337 Pump End Assembly
ITEM
NO.
1 HEX NUT D12 15991 8
1A HEX NUT D12 15991 8
2 LOCK WASHER J12 15991 8
2A LOCK WASHER J12 15991 8
3 SUCTION HEAD 38246-615 11010 1
4 WEAR RING 38691-369 11010 1
5 SUCTION HEAD O‐RING 25152-384 --- 1
5A PUMP CASING O‐RING 25152-384 --- 1
6 STUD C1211 15991 8
6A STUD C1211 15991 8
7 PUMP CASING SEE NOTE BELOW 1
8 PIPE PLUG P08 15079 3
9 PIPE PLUG P04 15079 1
10 REPAIR ROTATING ASSY 44163-520 --- 1
INCLUDED W/REPAIR PUMP CASING ASSY 46474-907 --- 1
INDICATES PARTS RECOMMENDED FOR STOCK
PART NAME
PART
NUMBER
MAT'L
CODE
QTY
MAINTENANCE & REPAIR PAGE E - 9
Page 33
OM-06469 PAH SERIES
ILLUSTRATION
Figure 5. 44163-520 Repair Rotating Assembly
MAINTENANCE & REPAIRPAGE E - 10
Page 34
PAH SERIES
OM-06469
PARTS LIST
44163-520 Repair Rotating Assembly
ITEM
NO.
1 SOCKET HEAD CAP SCREW BD1006 15991 1
2 IMPELLER WASHER 31177-007 17000 1
3 ROLL PIN S2197 --- 1
4 IMPELLER 38623-532 11010 1
5 IMP ADJ SHIM SET 8499 17000 1
6 MECH SEAL 25285-816 --- 1
7 SHAFT SLEEVE 31441-033 17000 1
8 O‐RING 25152-034 --- 1
9 SEAL CAVITY SIGHT GAUGE S1471 --- 2
9A BEARING CAVITY SIGHT GAUGE S1471 --- 2
10 SEAL PLATE 38272-534 10000 1
11 REDUCER PIPE BUSHING AP1202 15079 1
12 SEAL CAVTIY AIR VENT S1530 --- 1
12A BEARING CAVITY AIR VENT S1530 --- 1
13 OIL SEAL 25227-772 --- 1
13A OIL SEAL 25227-772 --- 1
14 GASKET 38683-665 18000 1
15 BEARING CAVITY FILL PLUG P12 15079 2
15A BEARING CAVITY DRAIN PLUG P12 15079 2
15B SEAL CAVITY DRAIN PLUG P12 15079 1
16 LOCK WASHER J10 15991 8
16A LOCK WASHER J10 15991 8
17 HEX HEAD CAP SCREW B1007 15991 6
17A HEX HEAD CAP SCREW B1007 15991 6
18 PEDESTAL 38257-210 10000 1
19 OIL SEAL 25258-845 --- 1
20 DRIVE FLANGE 38545-018 10000 1
21 GASKET 38683-664 18000 1
22 BEARING LOCKNUT 23962-015 --- 1
23 BEARING LOCK WASHER 23962-515 --- 1
24 BEARING 23422-417 --- 1
25 IMPELLER SHAFT 38512-534 16000 1
26 IMPELLER KEY N0606 15990 1
27 BALL BEARING S1217 --- 1
28 SHAFT KEY N1020 15990 1
PART NAME
PART
NUMBER
MAT'L
CODE
QTY
NOT SHOWN:
PUMP CASING O‐RING 25152-384 --- 1
SHIPPING PLUG 11495B 15079 2
INSTRUCTION TAG 6588U --- 1
INDICATES PARTS RECOMMENDED FOR STOCK
MAINTENANCE & REPAIR PAGE E - 11
Page 35
OM-06469 PAH SERIES
ILLUSTRATION
Figure 6. 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 - 12
QTY
Page 36
PAH SERIES
OM-06469
ILLUSTRATION
Figure 7. 46112-709 Priming Chamber Assembly
PARTS LIST
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 - 13
PART NAME
-ORIFICE BUTTON 26688-021 --- 1
PART
NUMBER
MAT'L
CODE
QTY
Page 37
OM-06469 PAH SERIES
ILLUSTRATION
Figure 8. 44162-165 Drive Assembly
ITEM
NO.
1 COUPLING KIT 48112-009 --- 1
2 -BUSHING 24131-375 --- 1
3 -COUPLING ASSEMBLY 24391-107 --- 1
4 LOCKWASHER 21171-536 --- 8
5 SOCKET HEAD CAPSCREW B0612 15991 8
5 SOCKET HEAD CAPSCREW 22645-174 --- 8
6 HEX HEAD CAPSCREW B0606 15991 10
6 HEX HEAD CAPSCREW 22645-166 --- 10
7 LOCKWASHER J06 15991 12
7 LOCKWASHER 21171-511 --- 12
8 STUD C0606 15991 2
8 STUD 26821-879 15991 2
9 HEX NUT D06 15991 2
9 HEX NUT 26821-932 --- 2
PART NAME
USE FOR SAE APPLICATIONS
USE FOR METRIC APPLICATIONS
PART
NUMBER
MAT'L
CODE
QTY
MAINTENANCE & REPAIRPAGE E - 14
Page 38
PAH SERIES
PUMP AND SEAL DISASSEMBLY AND REASSEMBLY
Review all SAFETY information in Section A.
Follow the instructions on all tags, label and de
cals attached to the pump.
This pump requires little service due to its rugged,
minimum‐maintenance design. However, if it be
comes necessary to inspect or replace the wearing
parts, follow these instructions which are keyed to
the illustrations (see Figures 1 through 8) and the
corresponding Parts Lists. Maintenance and repair
instructions for the engine are covered separately
in specific literature available from the manufactur
er.
This manual will alert personnel to known proce
dures which require special attention, to those
which could damage equipment, and to those
which could be dangerous to personnel. However,
this manual cannot possibly anticipate and provide
detailed precautions for every situation that might
occur during maintenance of the unit. Therefore, it
is the responsibility of the owner/maintenance per
sonnel to ensure that only safe, established main
tenance procedures are used, and that any proce
dures not addressed in this manual are performed
only after establishing that neither personal safety
nor pump integrity are compromised by such prac
tices.
Some pump service functions may be performed
without separating the pump end assembly from
the engine. However, the priming chamber (5, Fig
ure 3) and discharge check valve assembly (1, Fig
ure 3) 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 suc
tion and discharge lines and drain the pump cas
ing by removing the lowermost pipe plug (8, Figure
4). Clean and reinstall the plug.
OM-06469
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 open or service the
pump:
1. Familiarize yourself with this man
ual.
2. Shut down the engine and discon
nect 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 cau
tiously.
7. Drain the pump.
Use lifting and moving equipment in
good repair and with adequate capacity
MAINTENANCE & REPAIR PAGE E - 15
Page 39
PAH SERIESOM-06469
to prevent injuries to personnel or dam
age to equipment. If slings or chains are
used to move the pump or components,
make sure that the load is balanced;
otherwise serious personal injury or
death could result. Suction and dis
charge hoses and piping must be re
moved from the pump before lifting.
Use only replacement parts provided or
approved by Gorman‐Rupp. Use of non‐
authorized parts may result in damage to
the equipment and/or injury to personnel
and will invalidate the warranty.
Priming Chamber Removal And Disassembly
(Figure 6)
Remove the hex nut and lock washer securing the
orifice button to the linkage bar and unscrew the
orifice button from the linkage bar.
Discharge Check Valve Removal and
Disassembly
(Figure 3)
Remove the hardware (not shown) securing the
discharge check valve bracket to the base.
Support the discharge check valve assembly (1)
using a sling and a suitable lifting device. Remove
the hardware (not shown) and separate the dis
charge check valve assembly and gasket (not
shown) from the pump assembly (2).
The flapper and cover O‐ring are the only service
able parts of the check valve. If the flapper requires
replacement, remove the hardware securing the
cover. Separate the cover and O‐ring and remove
the flapper.
Disconnect both the suction piping and the air dis
charge tubing from the priming chamber assembly
(5, Figure 3). Support the priming chamber assem
bly using a sling and a suitable lifting device. Re
move the hardware (6 and 7) and separate the
priming chamber assembly, gasket (8) and baffle
(9) from the spool (6, Figure 3).
(Figure 7)
Remove the hardware (2 and 3) securing the prim
ing valve (1) to the priming chamber (5). Carefully
lift the valve components from the priming cham
ber. 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 by
pass through the priming chamber after adjusting
the orifice button (see Priming Chamber Reas
sembly and Installation for adjustment), the but
ton 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 piv
ot pin. This will allow the linkage to be raised high
enough to access the orifice button.
Suction Head and Wear Ring Removal
(Figure 4)
The wear ring (4) is easily accessible and may be
serviced by removing the suction head (3). Before
attempting to service the pump, remove the lower
most pipe plug (8) from the pump casing (7) and
drain the pump. Clean and reinstall the drain plug.
It is not necessary to remove the suction spool (7,
Figure 3) from the suction head unless replace
ment of the spool, gasket (4, Figure 3) or suction
head is required. To remove the suction spool, dis
engage the hardware (11 and 12, Figure 3) secur
ing it to the pump casing.
Remove the hardware (1 and 2) and securing the
suction head to the pump casing. Install two
5/8-11 UNC‐2B capscrews (not supplied) in the
tapped holes in the suction head and use the caps
crews to press the suction head out of the pump
casing. Remove the capscrews from the suction
head.
Remove and discard the O‐ring (5).
Inspect the wear ring and, if replacement is re
quired, install two 3/4-10 UNC‐2B capscrews (not
supplied) in the tapped holes in the suction head
and use the screws to press the wear ring out of the
MAINTENANCE & REPAIRPAGE E - 16
Page 40
PAH SERIES
OM-06469
suction head. Remove the capscrews from the
suction head.
Pump Casing Removal
(Figure 4)
Remove the uppermost pipe plug (8) from the
pump casing and install a lifting eye in the hole. Be
sure to screw the lifting eye tightly into the hole as
far as it will go. Attach a sling and suitable lifting de
vice to the lifting eye and support the pump casing.
Remove the hardware (1A and 2A) and use the lift
ing device to pull the pump casing straight away
from the rotating assembly (10).
Remove and discard the pump casing O‐ring (5A).
Draining Oil From Seal Cavity
(Figure 5)
If any further disassembly is to be performed on the
pump, the seal oil cavity must be drained to pre
vent the oil in the seal cavity from escaping as the
impeller is removed.
Position a clean container under the seal cavity
drain plug (15B). Remove the plug and drain the oil
from the seal cavity into the container. For shorter
drain time, remove the air vent (12). Clean and rein
stall the drain plug and air vent. Inspect the oil for
water, dirt or a cloudy condition which could indi
cate seal failure.
an alternating pattern to “walk” the impeller off the
shaft.
Remove the impeller adjusting shims (5); tie and
tag the shims, or measure and record their thick
ness for ease of reassembly.
Inspect the impeller and replace if cracked or badly
worn.
Seal Removal
(Figures 5 and 9)
Remove the spring centering washer and seal
spring. Slide the shaft sleeve (7) and rotating por
tion of the seal off the shaft as a unit.
Apply oil to the shaft sleeve and work it up under
the rubber bellows. Slide the rotating portion of the
seal off the shaft sleeve. Remove the shaft sleeve
O‐ring (8).
Use a pair of stiff wires with hooked ends to remove
the stationary element from the seal plate bore.
An alternate method of removing the stationary
seal components is to remove the hardware (16
and 17) and separate the seal plate and gasket
(14) from the pedestal (18). 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 element until the ele
ment and its O‐ring can be removed.
Impeller Removal
(Figure 5)
With the pump casing removed, use an impact
wrench with a hex key to loosen the impeller caps
crew (1). Remove the capscrew, impeller washer
(2) and roll pin (3).
Use a suitable three‐jawed puller to remove the im
peller (4) and key (26) from the shaft (25). Use cau
tion when removing the impeller; tension on the
shaft seal spring will be released as the impeller is
removed.
NOTE
An alternate method of removing the impeller is to
insert a pair of wedges 180_ apart between the im
peller and seal plate (10). Tap the wedges evenly in
MAINTENANCE & REPAIR PAGE E - 17
If no further disassembly is required, refer to Seal
Installation.
Separating Pedestal and Drive Assembly
From Engine
(Figure 8)
Support the pedestal using a hoist and sling, and
remove the hardware remove the hardware (6, 7
and 9) securing the drive flange (20, Figure 5) to
the engine bellhousing. Separate the assemblies
by pulling the pedestal straight away from the en
gine.
As the assemblies separate, the flexible portion of
the coupling assembly (3) will remain on the shaft.
To remove the coupling from the shaft, unscrew the
two allen head setscrews from the bushing (2).
Page 41
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 (28, Figure 5).
It is not necessary to remove the outer ring of the
coupling from the engine flywheel unless the cou
pling must be replaced. To remove the ring, disen
gage the hardware (4 and 5) securing it to the fly
wheel.
Move the pump end to a clean, well equipped shop
area for further disassembly.
Shaft and Bearing Removal and Disassembly
(Figure 5)
PAH SERIESOM-06469
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 pedestal, shaft and all component parts
(except the bearings) with a soft cloth soaked in
cleaning solvent. Inspect the parts for wear or dam
age and replace as necessary.
When the pump is properly operated and main
tained, the pedestal (18) should not require disas
sembly. 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 pedestal drain plug (15A) and drain
the lubricant. Clean and reinstall the drain plug. For
shorter drain time, remove the air vent (12A). Clean
and reinstall the drain plug and air vent after drain
ing.
If not removed with the seal assembly, remove the
hardware (16 and 17) and separate the seal plate
and gasket from the pedestal.
Disengage the hardware (16A and 17A) and re
move the drive flange (20), gasket (21) and oil seal
(19). Press the oil seal from the drive flange.
Place a block of wood against the impeller end of
the shaft (25) and tap the shaft and assembled
bearings (24 and 27) from the pedestal.
Most cleaning solvents are toxic and
flammable. Use them only in a well ven
tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain
ers.
Clean the bearings thoroughly in fresh cleaning
solvent. Dry the bearings with filtered compressed
air and coat with light oil.
Bearings must be kept free of all dirt and
foreign material. Failure to do so will great
ly shorten bearing life. Do not spin dry
bearings. This may scratch the balls or
races and cause premature bearing fail
ure.
Rotate the bearings by hand to check for rough
ness or binding and inspect the bearing rollers and
balls. If rotation is rough or the rollers or 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 pedestal.
Replace the bearings, shaft, or pedestal if the
proper bearing fit is not achieved.
Press the oil seals (13) from the pedestal.
After removing the shaft and bearings, clean and
inspect the bearings in place as follows.
If bearing replacement is required, straighten the
tab on the bearing lock washer (23). Use a spanner
wrench to remove the bearing lock nut (22). Re
move the bearing lock washer.
MAINTENANCE & REPAIRPAGE E - 18
Page 42
PAH SERIES
OM-06469
Use a bearing puller to remove the inboard and
outboard bearings from the shaft.
Shaft and Bearing Reassembly and Installation
(Figure 5)
Inspect the shaft (25) for distortion, nicks or
scratches, or for thread damage on the impeller
end. Dress small nicks and burrs with a fine file or
emery cloth. Replace the shaft if defective.
Clean and inspect the bearings as indicated in
Shaft And Bearing Removal And Disassembly.
To prevent damage during removal from
the shaft, it is recommended that bearings
be cleaned and inspected in place. It is
strongly recommended that the bearings
be replaced any time the shaft and bear
ings are removed.
The bearings may be heated to ease installation.
An induction heater, hot oil bath, electric oven, or
hot plate may be used to heat the bearings. Bear
ings should never be heated with a direct flame or
directly on a hot plate.
NOTE
If a hot oil bath is used to heat the bearings, both the
oil and the container must be absolutely clean. If
the oil has been previously used, it must be thor
oughly filtered.
NOTE
Position the outboard bearing (24) on the shaft with
the retaining ring on the bearing O.D. toward the
drive end of the shaft. The inboard bearing (27) is
equipped with a flange ring that is shipped loose
with the bearing. Install the flange ring on the shaft
prior to heating and installing the bearings.
Heat the bearings to a uniform temperature no
higher than 250F (120C), and slide the bearings
onto the shaft, one at a time, until they are fully
seated against the shaft shoulders. This should be
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
during cooling. If movement has occurred, use a
suitably sized sleeve and a press to reposition the
bearings against the shaft shoulders.
If heating the bearings is not practical, use a suit
ably sized sleeve and an arbor (or hydraulic) press
to install the bearings on the shaft.
When installing the bearings onto the
shaft, never press or hit against the outer
race, balls, rollers or cage. Press only on
the inner race.
It is recommended that a new bearing lock
washer (23) be installed any time the shaft
and bearings are disassembled. Re‐use of
an old lock washer may create a pre‐load
condition on the bearing, resulting in pre
mature bearing failure.
Install the bearing lockwasher (23) and screw the
bearing locknut (22) onto the shaft until tight.
Torque the bearing lock nut to (150 ft. lbs. (20,8 m.
kg.). After torquing, locate the tab on the lockwash
er that aligns with a slot in the lock nut and bend the
tab over into the slot.
Apply a light coating of oil to the lip of the inboard oil
seal (13) and press it into the pedestal bore with the
lip positioned as shown in Figure 6. Press the oil
seal into the pedestal until the face is just flush
with the machined surface on the pedestal.
It is recommended that a sleeve be positioned
against the inboard oil seal to prevent the lip of the
oil seal from rolling as the shaft and bearings are
installed in the pedestal. The O.D. of the sleeve
should be just smaller than the pedestal bore,
while the I.D. of the sleeve should be just larger
than the O.D. of the oil seal area of the shaft.
With the oil seal sleeve in place, lubricate the oil
seal area of the shaft and slide the shaft and as
sembled bearings into the pedestal until the retain
ing ring on the outboard bearing seats against the
pedestal. Remove the oil seal sleeve.
MAINTENANCE & REPAIR PAGE E - 19
Page 43
PAH SERIESOM-06469
When installing the shaft and bearings into
the bearing bore, push against the outer
race. Never hit the balls, rollers or cages.
Apply a light coating of oil to the lip of the outboard
oil seal (13) and press it into the pedestal with the
lip positioned as shown in Figure 5. The face of the
oil seal should be just flush with the outer face of
the pedestal.
Apply a light coating of oil to the lip of the oil seal
(19) and press it into the drive flange (20) with the
lip positioned as shown in Figure 5. The oil seal
should be centered in the flange bore.
Install the gasket (21) and slide the assembled
drive flange and oil seal over the impeller shaft. Use
caution not to cut or roll the lip of the oil seal (19) on
the shaft keyway. Secure the drive flange to the
pedestal with the hardware (16A and 17A). Torque
the capscrews (17A) to 41 ft. lbs. (5,7 m. kg.).
Make certain that the flexible portion of the
coupling is mounted as shown in Figure 9.
This is critical. If the coupling is not prop
erly positioned on the shaft, the coupling
parts may not fully engage, or a pre‐load
condition can cause premature bearing
failure.
The end of the shaft must be extend 0.44
inch (11 mm) from the face of the bush
ing. This will allow the two portions of the
coupling to fully engage when the engine
bracket is secured to the engine bellhous
ing without pre‐loading 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. (430 in. lbs. or 0,31 m.
kg.).
Lubricate the bearings as indicated in LUBRICA
TION at the end of this section.
Securing Pedestal And Drive Assembly To
Engine
(Figure 8)
Install the shaft key (28, Figure 5) in the shaft key
way. Position the flexible portion of the coupling as
sembly (3) on the shaft as shown in Figure 8.
NOTE
The flexible portion of the coupling must be proper
ly positioned on the shaft. The heads of the caps
crews in the center of the coupling must be posi
tioned away from the pump.
Align the keyway in the bushing (2) with the shaft
key, and slide it onto the shaft until the face of the
bushing is just flush with the end of the shaft. Ro
tate the flexible portion of the coupling until the
tapped holes for the two setscrews align with those
in the bushing, and install the setscrews.
If the complete coupling assembly is being re
placed, apply `Loctite Retaining Compound No.
242' or equivalent to the threads of the hardware (4
and 5) and secure the outer ring of the coupling to
the engine flywheel by torquing the hardware to 45
ft. lbs. (6,2 m. kg.).
Using a suitable lifting device, position the as
sembled drive and rotating assembly so the flex
ible portion of the coupling seats inside the outer
ring attached to the engine flywheel.
NOTE
To ease installation, lightly lubricate the rubber por
tion of the coupling with a non‐petroleum based
lubricant such as vegetable oil or glycerin, or a sili
con‐based lubricant such as “WD40” or equivalent.
Do not use petroleum‐based lubricants, or any oth
er substance which may soften or otherwise dam
age the rubber.
Secure the drive flange (20, Figure 5) to the engine
bellhousing with the previously removed hardware
(6, 7 and 9).
MAINTENANCE & REPAIRPAGE E - 20
Page 44
PAH SERIES
OM-06469
Seal Reassembly and Installation
(Figures 5 and 9)
Most cleaning solvents are toxic and
flammable. Use them only in a well ven
tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain
ers.
Clean the seal cavity and shaft with a cloth soaked
in fresh cleaning solvent. Inspect the stationary
seat bore in the seal plate for dirt, nicks and burrs,
and remove any that exist. The stationary seat bore
RETAINER
SPRING
IMPELLER
must be completely clean before installing the
seal.
A new seal assembly should be installed
any time the old seal is removed from the
pump. Wear patterns on the finished faces
cannot be realigned during reassembly.
Reusing an old seal could result in prema
ture failure.
To ease installation of the seal, lubricate the shaft
sleeve O‐ring and the stationary element O‐ring
with a very small amount of light lubricating oil.
See Figure 9 for seal part identification.
SEAL PLATE
O‐RING
SHAFT
KEY
IMPELLER
SHAFT
SPRING
CENTERING
WASHER
IMPELLER
SHIMS
BELLOWS
Figure 9. Seal Assembly
If the seal plate was removed, install the seal plate
gasket (14). Position the seal plate over the shaft
and secure it to the pedestal with the hardware (16
and 17).
ROTATING
ELEMENT
SLEEVE
O‐RING
SHAFT
SLEEVE
STATIONARY
ELEMENT
This seal is not designed for operation at
temperatures above 160F (71C). Do not
use at higher operating temperatures.
MAINTENANCE & REPAIR PAGE E - 21
Press the stationary element and its O‐ring into the
seal plate until fully seated in the seal plate bore. A
push tube cut from a length of plastic pipe would
Page 45
PAH SERIESOM-06469
aid this process. The I.D. of the tube should be
slightly larger than the O.D. of the shaft sleeve (7).
Install the shaft sleeve O‐ring (8) in the groove in
the I.D. of the sleeve. Lubricate the O‐ring and the
O.D. of the shaft sleeve with “P-80
Emulsion” or
water. Do not use oil or any substitute lubricant
other than water.
Slide the rotating subassembly (consisting of the
rotating element, retainer and bellows) onto the
sleeve until the rotating element is just flush with
the chamfered end of the sleeve. Slide the shaft
sleeve and rotating subassembly onto the shaft
until the seal faces contact and the shaft sleeve
seats against the shoulder on the impeller shaft.
Install the seal spring and spring centering washer.
Lubricate the seal assembly as indicated in
LUBRICATION, after the impeller has been in
stalled.
Impeller Installation And Adjustment
(Figure 5)
Pump Casing Installation
(Figure 4)
Lubricate the O‐ring (5A) with light grease and in
stall it in the groove in the O.D. of the seal plate.
Install a lifting eye in the uppermost hole in the
pump casing (1) for the pipe plug (8). Be sure to
screw the lifting eye tightly into the hole as far as it
will go. Attach a sling and suitable lifting device to
the lifting eye and use the lifting device to position
the pump casing over the rotating assembly. Install
the hardware (1 and 2) on the studs (6A) and use
the hardware to fully seat the pump casing against
the seal plate.
See Figure 3. If the suction spool (6) was removed,
install a new gasket (4) and secure the spool to the
pump casing with the previously removed hard
ware (11 and 12).
Suction Head and Wear Ring Installation
(Figure 4)
If the wear ring (4) was removed, position the re
placement wear ring in the suction head (3) and
use an arbor (or hydraulic) press to press it into the
suction head until fully seated.
Inspect the impeller (4) and replace it if cracked or
badly worn.
Install the same thickness of adjusting shims (5) as
previously installed. Install the impeller key (26) in
the shaft keyway. Align the keyway in the impeller
with the shaft key and press the impeller onto the
shaft until fully seated.
A clearance of .025 to .040 inch (0,64 to 1,02 mm)
between the impeller and the seal plate is neces
sary for maximum pump efficiency. Measure this
clearance and add or remove impeller adjusting
shims as required.
Apply `Loctite Retaining Compound No. 242' or
equivalent to the threads of the impeller capscrew
(2). Install the roll pin (4) in the hole in the impeller.
Position the impeller washer over the end of the im
peller shaft so the hole in the washer aligns with the
roll pin. Use a strap wrench to block impeller rota
tion and torque the impeller capscrew to 180 ft. lbs.
(24,9 m. kg.).
Install the O‐ring (5) in the groove in the O.D. of the
suction head and lubricate it with light grease.
Position the suction head over the studs (6) and se
cure with the hardware (1 and 2).
Discharge Check Valve Reassembly And
Installation
(Figure 3)
If the discharge check valve (1) was disassembled
to replace the flapper or cover O‐ring, position the
flapper in the valve body and check to ensure free
movement.
Install the valve cover O‐ring and secure the cover
to the body with the previously removed hardware.
Apply a small amount of light grease to the dis
charge flange gasket to hold it in place and posi
tion it against the pump casing flange. Support the
discharge check valve assembly using a sling and
a suitable lifting device. Using the previously re
moved hardware, secure the discharge check
valve assembly and flange gasket to the pump as
sembly (2). Secure the discharge check valve to its
MAINTENANCE & REPAIRPAGE E - 22
Page 46
PAH SERIES
OM-06469
support bracket using the previously removed
hardware.
Priming Chamber Assembly And Installation
(Figure 7)
Clean and inspect the components of the priming
valve (1). Inspect the linkage and ensure the orifice
button (not shown) squarely engages the valve
seat. Replace the orifice button if required (see
Priming Chamber Removal and Disassembly
for orifice button removal).
If the orifice button was removed, screw the new
orifice button into the linkage bar until fully seated.
Align the hole in the linkage bar with the holes in the
bracket and reinstall the pivot pin. Secure the pivot
pin with the previously removed “e‐clip”.
Adjust the orifice button seating as necessary by
screwing the orifice button into or out of the linkage
bar. Proper adjustment is achieved when the ori
fice button fully seats against the orifice before the
linkage bar on the float bottoms against the
threads on the orifice button. When adjustment is
complete, install and tighten the lock washer and
hex nut securing the orifice button.
approximately 170 ounces (5 liters) of SAE No. 30
non‐detergent oil to the center of the sight
gauge(s) (9). Clean and reinstall the air vent and
bushing. Check the oil level regularly and maintain
it at the middle of the sight gauge.
Bearings
(Figure 5)
The pedestal was fully lubricated when shipped
from the factory. Check the oil level regularly
through the sight gauge(s) (9A) and maintain it at
the midpoint of the gauge(s). When lubrication is
required, remove one of the pipe plugs (15) and
add SAE No. 30 non‐detergent oil through the
opening. When lubricating a dry (overhauled) ped
estal, fill the pedestal with approximately 50
ounces (1,5 liters). Clean and reinstall the fill plug.
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 gauge must be posi
tioned horizontally to provide proper drainage.
Install the strainer (6) and priming valve gasket (4).
Lower the float into the priming chamber (5) and
secure the priming valve with the previously re
moved hardware (2 and 3).
(Figure 6)
Install the baffle and gasket (8 and 9) and use a
sling and suitable lifting device to position the prim
ing chamber assembly on the pump suction spool
(7, Figure 3). Secure the priming chamber assem
bly with the hardware (6 and 7).
Reconnect both the suction piping and the air dis
charge tubing to the priming chamber assembly.
LUBRICATION
Seal Assembly
(Figure 5)
Under normal conditions, drain the pedestal once
each year and refill with clean oil. Change the oil
more frequently if the pump is operated continu
ously or installed in an environment with rapid tem
perature change.
Monitor the condition of the bearing lubri
cant regularly for evidence of rust or mois
ture condensation. This is especially im
portant in areas where variable hot and
cold temperatures are common.
For cold weather operation, consult the factory or a
lubricant supplier for the recommended grade of
oil.
Engine
Before starting the pump, remove the air vent and
bushing (11 and 12) and fill the seal cavity with
MAINTENANCE & REPAIR PAGE E - 23
Consult the literature supplied with the engine, or
contact your local engine representative.
Page 47
For U.S. and International Warranty Information,
Please Visit www.grpumps.com/warranty
or call:
U.S.: 419-755-1280
International: +1-419-755-1352
For Canadian Warranty Information,
Please Visit www.grcanada.com/warranty
or call:
519-631-2870
THE GORMAN‐RUPP COMPANY MANSFIELD, OHIO
GORMAN‐RUPP OF CANADA LIMITED ST. THOMAS, ONTARIO, CANADA
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