GORMAN-RUPP PUMPS T6A65S-F4L Application guide

OM‐06190‐01
August 29, 2008
Rev. B 10‐24‐12
ACDEU
THE GORMAN‐RUPP COMPANY DMANSFIELD, OHIO
www.grpumps.com
GORMAN‐RUPP OF CANADA LIMITED DST. THOMAS, ONTARIO, CANADA Printed in U.S.A.
e2008 The Gorman‐Rupp Company
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
WITH PARTS LIST
SUPER T SERIES PUMP
MODEL
T6A65S‐F4L

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Gorman‐Rupp pump online at
www.grpumps.com
Valid serial number and e‐mail address required.
RECORD YOUR PUMP MODEL AND SERIAL NUMBER
Please record your pump model and serial number in the
spaces provided below. Your Gorman‐Rupp distributor
needs this information when you require parts or service.
Pump Model:
Serial Number:
The engine exhaust from this
product contains chemicals
known to the State of California to
cause cancer, birth defects or
other reproductive harm.

TABLE OF CONTENTS
i
INTRODUCTION PAGE I - 1.................................................
SAFETY ‐ SECTION A PAGE A - 1............................................
INSTALLATION - SECTION B PAGE B - 1....................................
Pump Dimensions PAGE B - 1.....................................................
PREINSTALLATION INSPECTION PAGE B - 2............................................
Battery Specifications And Installation PAGE B - 2....................................
POSITIONING PUMP PAGE B - 2.......................................................
Lifting PAGE B - 2.................................................................
Mounting PAGE B - 3.............................................................
Clearance PAGE B - 3.............................................................
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 - 4..............................................................
Sealing PAGE B - 4...............................................................
Suction Lines In Sumps PAGE B - 4.................................................
Suction Line Positioning PAGE B - 4................................................
FLOAT SWITCHES PAGE B - 5.........................................................
Installation PAGE B - 5............................................................
OPTIONAL SUBMERSIBLE TRANSDUCER PAGE B - 6...................................
DISCHARGE LINES PAGE B - 7........................................................
Siphoning PAGE B - 7.............................................................
Valves PAGE B - 7................................................................
Bypass Lines PAGE B - 7..........................................................
AUTOMATIC AIR RELEASE VALVE PAGE B - 8...........................................
Theory of Operation PAGE B - 8....................................................
Air Release Valve Installation PAGE B - 9............................................
ALIGNMENT PAGE B - 10..............................................................
OPERATION - SECTION C PAGE C - 1......................................
PRIMING PAGE C - 1.................................................................
STARTING PAGE C - 2................................................................
Manual Starting PAGE C - 2........................................................
Automatic Starting PAGE C - 2.....................................................
OPTIONAL EPS CONTROL PAGE C - 3.................................................
Features PAGE C - 3..............................................................
Functional Description PAGE C - 3..................................................
EPS Functions PAGE C - 4.........................................................
EPS Calibration PAGE C - 4........................................................
Zero Adjustment PAGE C - 4.......................................................
Span Adjustment PAGE C - 5......................................................
Level Adjustment PAGE C - 5......................................................

TABLE OF CONTENTS
(continued)
ii
Horn Delay PAGE C - 5............................................................
OPERATION PAGE C - 5..............................................................
Lines With a Bypass PAGE C - 5....................................................
Lines Without a Bypass PAGE C - 5.................................................
Leakage PAGE C - 5..............................................................
Liquid Temperature And Overheating PAGE C - 6.....................................
Strainer Check PAGE C - 6.........................................................
Pump Vacuum Check PAGE C - 6..................................................
STOPPING PAGE C - 6................................................................
Manual Stopping PAGE C - 6.......................................................
Automatic Stopping PAGE C - 6....................................................
Safety Shutdown System PAGE C - 7...............................................
OPERATION IN EXTREME HEAT PAGE C - 7............................................
Cold Weather Preservation PAGE C - 7..............................................
BEARING TEMPERATURE CHECK PAGE C - 8..........................................
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 Assy PAGE E - 7........................................................
Repair Rotating Assy PAGE E - 9...................................................
Drive Assy PAGE E - 10............................................................
PUMP AND SEAL DISASSEMBLY AND REASSEMBLY PAGE E - 11.........................
Back Cover And Wear Plate Removal PAGE E - 11.....................................
Suction Check Valve Removal PAGE E - 12...........................................
Separating Intermediate And Drive Assembly From Engine PAGE E - 12..................
Loosening Impeller PAGE E - 12.....................................................
Rotating Assembly Removal PAGE E - 13.............................................
Impeller Removal PAGE E - 13......................................................
Seal Removal PAGE E - 13..........................................................
Shaft and Bearing Removal and Disassembly PAGE E - 14.............................
Shaft and Bearing Reassembly and Installation PAGE E - 15............................
Seal Installation PAGE E - 16........................................................
Impeller Installation PAGE E - 19.....................................................
Rotating Assembly Installation PAGE E - 19...........................................
Suction Check Valve Installation PAGE E - 19.........................................
Back Cover Installation And Adjustment PAGE E - 19..................................
Securing Pump End To Engine PAGE E - 20..........................................
PRESSURE RELIEF VALVE MAINTENANCE PAGE E - 21..................................
Final Pump Assembly PAGE E - 22..................................................
LUBRICATION PAGE E - 22.............................................................
Seal Assembly PAGE E - 22.........................................................
Bearings PAGE E - 22..............................................................
Engine PAGE E - 22................................................................

SUPER T SERIES OM-06190
PAGE I - 1INTRODUCTION
INTRODUCTION
Thank You for purchasing a Gorman‐Rupp pump.
Read this manual carefully to learn how to safely
install and operate your pump. Failure to do so
could result in personal injury or damage to the
pump.
This pump is a Super T Series, semi‐open impeller,
self‐priming centrifugal model with a suction check
valve. The pump also is designed with external
shimless adjusters for setting the wear plate to im
peller clearance. The pump is close coupled to a
Deutz F4L diesel engine, and is designed for han
dling dirty water containing specified entrained sol
ids and slurries. The basic material of construction
is type CD4MCu stainless steel.
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.
For information or technical assistance on the en
gine, contact the engine manufacturer's local
dealer or representative.
If there are any questions regarding the pump or
its application which are not covered in this man
ual or in other literature accompanying this unit,
please contact your Gorman‐Rupp distributor, or
write:
The Gorman‐Rupp Company
P.O. Box 1217
Mansfield, Ohio 44901-1217
Phone: [phone]
or:
Gorman‐Rupp of Canada Limited
70 Burwell Road
St. Thomas, Ontario N5P 3R7
Phone: [phone]
The following are used to alert maintenance per
sonnel to procedures which require special atten
tion, to those which could damage equipment, and
to those which could be dangerous to personnel:
Immediate hazards which WILL result in
severe personal injury or death. These
instructions describe the procedure re
quired and the injury which will result
from failure to follow the procedure.
Hazards or unsafe practices which
COULD result in severe personal injury
or death. These instructions describe
the procedure required and the injury
which could result from failure to follow
the procedure.
Hazards or unsafe practices which COULD
result in minor personal injury or product
or property damage. These instructions
describe the requirements and the possi
ble damage which could result from failure
to follow the procedure.
NOTE
Instructions to aid in installation, operation, and
maintenance or which clarify a procedure.

SUPER T SERIES OM-06190
PAGE A - 1SAFETY
SAFETY ‐ SECTION A
This information applies to Super T Se
ries engine driven pumps. Refer to the
manual accompanying the engine be
fore attempting to begin operation.
Because pump installations are seldom
identical, this manual cannot possibly
provide detailed instructions and pre
cautions for each specific application.
Therefore, it is the owner/installer's re
sponsibility to ensure that applications
not addressed in this manual are per
formed only after establishing that nei
ther operator safety nor pump integrity
are compromised by the installation.
Before attempting to open or service the
pump:
1. Familiarize yourself with this man
ual.
2. Set the HAND‐OFF‐AUTO switch to
`OFF', and disconnect the positive
battery cable to ensure that the
pump will remain inoperative.
3. Allow the pump to completely cool
if overheated.
4. Check the temperature before
opening any covers, plates, or
plugs.
5. Close the suction and discharge
valves.
6. Vent the pump slowly and cau
tiously.
7. Drain the pump.
This pump is 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.
This pump is designed to handle mild
industrial corrosives, residues or slur
ries containing specified entrained sol
ids. Do not attempt to pump volatile,
corrosive, or flammable materials which
may damage the pump or endanger per
sonnel 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. 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 unit 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 for long periods
of time. If operated against a closed dis
charge valve, pump components will
deteriorate, and the liquid could come

SUPER T SERIESOM-06190
PAGE A - 2 SAFETY
to a boil, build pressure, and cause the
pump casing to rupture or explode.
This pump is designed to handle materi
als which could cause illness or injury
through direct exposure or emitted
fumes. Wear adequate protective cloth
ing when working on the pump or pip
ing.
Do not remove plates, covers, gauges,
pipe plugs, or fittings from an over
heated pump. Vapor pressure within the
pump can cause parts being disen
gaged to be ejected with great force. Al
low the pump to completely cool before
servicing.
Do not operate an internal combustion
engine in an explosive atmosphere.
When operating internal combustion
engines in an enclosed area, make cer
tain that exhaust fumes are piped to the
outside. These fumes contain carbon
monoxide, a deadly gas that is color
less, tasteless, and odorless.
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. The maximum continuous
operating speed for this pump is 1700
RPM.
Pumps and related equipment must be in
stalled and operated according to all na
tional, local and industry standards.

SUPER T SERIES OM-06190
PAGE B - 1INSTALLATION
INSTALLATION - SECTION B
Review all SAFETY information in Section A.
Since pump installations are seldom identical, this
section offers only general recommendations and
practices required to inspect, position, and ar
range the pump and piping.
Most of the information pertains to a standard
static lift application where the pump is positioned
above the free level of liquid to be pumped.
If installed in a flooded suction application where
the liquid is supplied to the pump under pressure,
some of the information such as mounting, line
configuration, and priming must be tailored to the
specific application. Since the pressure supplied
to the pump is critical to performance and safety,
be sure to limit the incoming pressure to 50% of the
maximum permissible operating pressure as
shown on the pump performance curve.
For further assistance, contact your Gorman‐Rupp
distributor or the Gorman‐Rupp Company.
Pump Dimensions
See Figure 1 for the approximate physical dimen
sions of this pump.
OUTLINE DRAWING
Figure 1. Pump Model T6A65S-F4L

OM-06190 SUPER T SERIES
PAGE B - 2 INSTALLATION
PREINSTALLATION INSPECTION
The pump assembly was inspected and tested be
fore shipment from the factory. Before installation,
inspect the pump for damage which may have oc
curred during shipment. Check as follows:
a. Inspect the pump assembly for cracks, dents,
damaged threads, and other obvious dam
age.
b. Check for and tighten loose attaching hard
ware. Since gaskets tend to shrink after dry
ing, check for loose hardware at mating sur
faces.
c. Carefully read all tags, decals, and markings
on the pump assembly, and perform all duties
indicated.
d. Check levels and lubricate as necessary. Re
fer to LUBRICATION in the MAINTENANCE
AND REPAIR section of this manual and per
form duties as instructed.
e. If the pump and engine have been stored for
more than 12 months, some of the compo
nents or lubricants may have exceeded their
maximum shelf life. These must be inspected
or replaced to ensure maximum pump serv
ice.
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.
Battery Specifications And Installation
Unless otherwise specified on the pump order, the
engine battery was not included with the unit. Re
fer to the following specifications when selecting a
battery.
Table 1. Battery Specifications
Crank
@ 0_F
Reserve
Capacity
(Minutes)
@ 80_F
Overall
Dims.
(Inches)
850 120
10.25L
Cold
Amps
Approx.
Amp/
Hr.
Rating
75 6.75W
8.88H
x
x
Voltage
12 Volts
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.
POSITIONING PUMP
Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam
age 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.
Lifting
Pump unit weights will vary depending on the
mounting and drive provided. Check the shipping
tag on the unit packaging for the actual weight, and
use lifting equipment with appropriate capacity.
Drain the pump and remove all customer‐installed
equipment such as suction and discharge hoses
or piping before attempting to lift existing, installed
units.
The pump assembly can be seriously

SUPER T SERIES OM-06190
PAGE B - 3INSTALLATION
damaged if the cables or chains used to lift
and move the unit are improperly wrapped
around the pump.
Mounting
Locate the pump in an accessible place as close as
practical to the liquid being pumped. Level mount
ing is essential for proper operation.
The pump may have to be supported or shimmed
to provide for level operation or to eliminate vibra
tion.
If the pump has been mounted on a moveable
base, make certain the base is stationary by setting
the brake and blocking the wheels before attempt
ing to operate the pump.
To ensure sufficient lubrication and fuel supply to
the engine, do not position the pump and engine
more than 15_off horizontal for continuous opera
tion. The pump and engine may be positioned up
to 30_off horizontal for intermittent operation
only; however, the engine manufacturer should be
consulted for continuous operation at angles
greater than 15_.
Clearance
When positioning the pump, allow a minimum
clearance of 18 inches (457,2 mm) in front of the
back cover to permit removal of the cover and easy
access to the pump interior.
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 notes
on Page E‐1 to be sure your overall application al
lows pump to operate within the safe operation
range.
Materials
Either pipe or hose maybe used for suction and
discharge lines; however, the materials must be
compatible with the liquid being pumped. If hose is
used in suction lines, it must be the rigid‐wall, rein
forced type to prevent collapse under suction. Us
ing piping couplings in suction lines is not recom
mended.
Line Configuration
Keep suction and discharge lines as straight as
possible to minimize friction losses. Make mini
mum use of elbows and fittings, which substan
tially increase friction loss. If elbows are necessary,
use the long‐radius type to minimize friction loss.
Connections to Pump
Before tightening a connecting flange, align it ex
actly with the pump port. Never pull a pipe line into
place by tightening the flange bolts and/or cou
plings.
Lines near the pump must be independently sup
ported to avoid strain on the pump which could
cause excessive vibration, decreased bearing life,
and increased shaft and seal wear. If hose‐type
lines are used, they should have adequate support
to secure them when filled with liquid and under
pressure.
Gauges
Most pumps are drilled and tapped for installing
discharge pressure and vacuum suction gauges.
If these gauges are desired for pumps that are not
tapped, drill and tap the suction and discharge
lines not less than 18 inches (457,2 mm) from the
suction and discharge ports and install the lines.
Installation closer to the pump may result in erratic
readings.
SUCTION LINES
To avoid air pockets which could affect pump prim
ing, the suction line must be as short and direct as
possible. When operation involves a suction lift, the
line must always slope upward to the pump from
the source of the liquid being pumped; if the line
slopes down to the pump at any point along the
suction run, air pockets will be created.
Fittings
Suction lines should be the same size as the pump
inlet. If reducers are used in suction lines, they
should be the eccentric type, and should be in

OM-06190 SUPER T SERIES
PAGE B - 4 INSTALLATION
stalled with the flat part of the reducers uppermost
to avoid creating air pockets. Valves are not nor
mally used in suction lines, but if a valve is used,
install it with the stem horizontal to avoid air pock
ets.
Strainers
If a strainer is furnished with the pump, be certain
to use it; any spherical solids which pass through a
strainer furnished with the pump will also pass
through the pump itself.
If a strainer is not furnished with the pump, but is
installed by the pump user, make certain that the
total area of the openings in the strainer is at least
three or four times the cross section of the suction
line, and that the openings will not permit passage
of solids larger than the solids handling capability
of the pump.
This pump is designed to handle up to 3‐inch (76,2
mm) diameter spherical solids.
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. veloc
ity.
NOTE
The pipe submergence required may be reduced
by installing a standard pipe increaser fitting at the
end of the suction line. The larger opening size will
reduce the inlet velocity. Calculate the required
submergence using the following formula based
on the increased opening size (area or diameter).

SUPER T SERIES OM-06190
PAGE B - 5INSTALLATION
Figure 2. Recommended Minimum Suction Line Submergence vs. Velocity
FLOAT SWITCHES
Installation
The standard pump is equipped with an auto‐start
control system, and can be conformed to start and
stop as the liquid level in the wet well or sump rises
and falls. The autostart unit employs either a single
or double float switch system, where a bulb raises
or lowers (floats) with the liquid level, thus activat
ing 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.

OM-06190 SUPER T SERIES
PAGE B - 6 INSTALLATION
OPERATING
RANGE
(See Table Below)
CABLE
TETHER
POINT
OFF
(Emptying)
ON
(Filling)
ON
(Emptying)
OFF
(Filling)
1.25” Pipe
(Not Furnished)
ENGINE
CONTROL
BOX
1.0
(0.3)
APPROXIMATE FREE CORD LENGTH IN FT. (M)
0.5
(.15)
1.0
(0.3)
1.5
(.46)
2.0
(0.6)
2.5
(.76)
3.0
(0.9)
2.0
(0.6)
3.0
(0.9)
4.0
(1.2)
Figure 3. Float Switch Data
OPTIONAL SUBMERSIBLE
TRANSDUCER
This unit may be equipped with an optional Elec
tronic Pressure Switch (EPS) that works in con
junction with a submersible transducer. The sub
mersible transducer converts pressure to an elec
trical signal proportional to liquid level. This electri
cal signal is distributed to the digital display on the
EPS through a scaling circuit which converts the
electrical signal to “feet of water”.
When installing the submersible transducer, note
the following:
a. Handle the signal cable and transducer with
care during installation. Carefully lower the
transducer into the wet well or sump; do not
drop it to the bottom. To avoid clogging, sus
pend the transducer off the bottom.
b. Be sure to provide sufficient room in the wet
well or sump so that the transducer does not
get drawn into the suction line. To prevent this,
a flexible suction hose may be extended to lay
along the bottom of the wet well or sump. The
transducer can then be attached to the hose
above the point where it bends along the bot
tom. See Figure B-4 for a typical installation.
c. The wet well or sump must be vented to atmo
sphere.
d. The EPS is scaled in feet of water column. If
the measured medium is other than 1.0 spe
cific gravity, the reading on the EPS should be
divided by the specific gravity of the mea
sured medium to obtain the actual level.
e. Thoroughly clean the transducer after each
use to prevent clogging.
Do not disassemble the transducer or
loosen the compression nut at the signal
cable entry. This will void warranty. There
are no user‐serviceable parts inside. Do
not nick or cut the jacket of the signal
cable; this will cause leakage and void
warranty.

SUPER T SERIES OM-06190
PAGE B - 7INSTALLATION
FLOW
DISCHARGE
LINE
SUCTION
LINE
SIGNAL CABLE
(ATTACH TO
SUCTION LINE)
SUBMERSIBLE
TRANSDUCER
(DOWNSTREAM
FROM SUCTION)
SUCTION
STRAINER
Figure 4. Typical Submersible Transducer Installation
DISCHARGE LINES
Siphoning
Do not terminate the discharge line at a level lower
than that of the liquid being pumped unless a si
phon breaker is used in the line. Otherwise, a si
phoning action causing damage to the pump
could result.
Valves
If a throttling valve is desired in the discharge line,
use a valve as large as the largest pipe to minimize
friction losses. Never install a throttling valve in a
suction line.
With high discharge heads, it is recommended that
a throttling valve and a system check valve be in
stalled in the discharge line to protect the pump
from excessive shock pressure and reverse rota
tion when it is stopped.
If the application involves a high discharge
head, gradually close the discharge
throttling valve before stopping the pump.
Bypass Lines
Self‐priming pumps are not air compressors. Dur
ing the priming cycle, air from the suction line must
be vented to atmosphere on the discharge side. If
the discharge line is open, this air will be vented
through the discharge. However, if a check valve
has been installed in the discharge line, the dis
charge side of the pump must be opened to atmos
pheric pressure through a bypass line installed be
tween the pump discharge and the check valve. A
self‐priming centrifugal pump will not prime if
there is sufficient static liquid head to hold the dis
charge check valve closed.
NOTE
The bypass line should be sized so that it does not

OM-06190 SUPER T SERIES
PAGE B - 8 INSTALLATION
affect pump discharge capacity; however, the by
pass line should be at least 1 inch (25,4 mm) in di
ameter to minimize the chance of plugging.
In low discharge head applications (less than 30
feet (9,1 m)), it is recommended that the bypass
line be run back to the wet well, and located 6
inches below the water level or cut‐off point of the
low level pump. In some installations, this bypass
outline may be terminated with a six‐to‐eight foot
(1,8 to 2,4 m) length of 1‐1/4 inch (31,8 mm) I.D.
smooth‐bore hose; air and liquid vented during
the priming process will then agitate the hose and
break up any solids, grease, or other substances
likely to cause clogging.
A bypass line that is returned to a wet well
must be secured against being drawn into
the pump suction inlet.
It is also recommended that pipe unions be in
stalled at each 90_elbow in a bypass line to ease
disassembly and maintenance.
In high discharge head applications (more than
30 feet (9,1 m), an excessive amount of liquid may
be bypassed and forced back to the wet well under
the full working pressure of the pump; this will re
duce overall pumping efficiency. Therefore, it is
recommended that a Gorman‐Rupp Automatic
Air Release Valve be installed in the bypass line.
Gorman‐Rupp Automatic Air Release Valves are
reliable, and require minimum maintenance. See
Automatic Air Release Valves in this section for
installation and theory of operation of the Auto
matic Air Release Valve. Consult your Gorman‐
Rupp distributor, or contact the Gorman‐Rupp
Company for selection of an Automatic Air Release
Valve to fit your application.
Except in certain specific applications (to
prevent flooding during service of an auto
matic air release valve in a below‐ground
lift station), if a manual shut‐off valve is in
stalled anywhere in a bypass line, it must
be a full‐opening, ball‐type valve to pre
vent plugging by solids.
A manual shut‐off valve should not be
installed in any bypass line. A manual
shut‐off valve may inadvertently be left
closed during operation. A pump which
has lost prime may continue to operate
without reaching prime, causing dan
gerous overheating and possible explo
sive rupture of the pump casing. Per
sonnel could be severely injured.
Allow an over‐heated pump to com
pletely cool before servicing. Do not re
move plates, covers, gauges, or fittings
from an over‐heated pump. Liquid with
in the pump can reach boiling tempera
tures, and vapor pressure within the
pump can cause parts being disen
gaged to be ejected with great force. Af
ter the pump completely cools, drain the
liquid from the pump by removing the
casing drain plug. Use caution when re
moving the plug to prevent injury to per
sonnel from hot liquid.
AUTOMATIC AIR RELEASE VALVE
When properly installed and correctly adjusted to
the specific hydraulic operating conditions of the
application, the Gorman‐Rupp Automatic Air Re
lease Valve will permit air to escape through the by
pass line, and then close automatically when the
pump is fully primed and pumping at full capacity.
Theory of Operation
Figures 5 and 6 show a cross‐sectional view of the
Automatic Air Release Valve, and a corresponding
description of operation.

SUPER T SERIES OM-06190
PAGE B - 9INSTALLATION
É
É
É
Figure 5. Valve in Open Position
During the priming cycle, air from the pump casing
flows through the bypass line, and passes through
the Air Release Valve to the wet well (Figure 5).
É
É
É
É
Figure 6. Valve in Closed Position
When the pump is fully primed, pressure resulting
from flow against the valve diaphragm com
presses the spring and closes the valve (Figure 6).
The valve will remain closed, reducing the bypass
of liquid to 1 to 5 gallons per minute, until the pump
loses its prime or stops.
Some leakage (1 to 5 gallons (3,8 to 18,9
Liters) per minute) will occur when the
valve is fully closed. Be sure the bypass
line is directed back to the wet well or
tank to prevent hazardous spills.
When the pump shuts down, the spring returns the
diaphragm to its original position. Any solids that
may have accumulated in the diaphragm chamber
settle to the bottom and are flushed out during the
next priming cycle.
NOTE
The valve will remain open if the pump does not
reach its designed capacity or head. Valve closing
pressure is dependent upon the discharge head of
the pump at full capacity. The range of the valve
closing pressure is established by the tension rate
of the spring as ordered from the factory. Valve clos
ing pressure can be further adjusted to the exact
system requirements by moving the spring retain
ing pin up or down the plunger rod to increase or
decrease tension on the spring. Contact your Gor
man‐Rupp distributor or the Gorman‐Rupp Com
pany for information about an Automatic Air Re
lease Valve for your specific application.
Air Release Valve Installation
The Automatic Air Release Valve must be inde
pendently mounted in a horizontal position and
connected to the discharge line of the self‐priming
centrifugal pump (see Figure 7).
NOTE
If the Air Release Valve is to be installed on a staged
pump application, contact the factory for specific
installation instructions.

OM-06190 SUPER T SERIES
PAGE B - 10 INSTALLATION
DISCHARGE PIPE
DISCHARGE
CHECK VALVE
PUMP DISCHARGE
SELF‐PRIMING
CENTRIFUGAL
PUMP
SUCTION
LINE
SUPPORT
BRACKET
CLEAN‐OUT
COVER
INSTALL AIR RELEASE VALVE
IN HORIZONTAL POSITION
90_LONG
RADIUS
ELBOW
WET WELL
OR SUMP
BLEED LINE 1”
(25,4 MM) DIA. MIN.
(CUSTOMER FUR
NISHED) EXTEND 6”
(152 MM) BELOW
PUMP OFF LIQUID
LEVEL
Figure 7. Typical Automatic Air Release Valve Installation
The valve inlet line must be installed between the
pump discharge port and the non‐pressurized side
of the discharge check valve. The valve inlet is at
the large end of the valve body, and is provided
with standard 1 inch NPT pipe threads.
The valve outlet is located at the opposite end of
the valve, and is also equipped with standard 1
inch NPT pipe threads. The outlet should be con
nected to a bleed line which slopes back to the wet
well or sump. The bleed line must be the same size
as the inlet piping, or larger. If piping is used for the
bleed line, avoid the use of elbows whenever pos
sible.
NOTE
It is recommended that each Air Release Valve be
fitted with an independent bleeder line directed
back to the wet well. If multiple Air Release Valves
are installed in a system, they must be fitted with in
dependent bleeder lines; never use a common
manifold pipe. Contact your Gorman‐Rupp distrib
utor or the Gorman‐Rupp Company for information
about installation of an Automatic Air Release Valve
for your specific application.
ALIGNMENT
The alignment of the pump and the engine is criti
cal for trouble‐free mechanical operation. See Sec
tion E, Securing Intermediate And Drive Assem
bly To Engine for detailed information.

OM-06190
SUPER T SERIES
OPERATION PAGE C - 1
OPERATION - SECTION C
Review all SAFETY information in Section A.
Follow the instructions on all tags, labels and
decals attached to the pump.
Do not operate an internal combustion
engine in an explosive atmosphere.
When operating internal combustion
engines in an enclosed area, make cer
tain that exhaust fumes are piped to the
outside. These fumes contain carbon
monoxide, a deadly gas that is color
less, tasteless, and odorless.
This pump is designed to handle mild
industrial corrosives, residues or slur
ries containing specified entrained sol
ids. Do not attempt to pump volatile,
corrosive, or flammable materials which
may damage the pump or endanger per
sonnel as a result of pump failure.
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 1700
RPM.
PRIMING
Install the pump and piping as described in IN
STALLATION. Make sure that the piping connec
tions are tight, and that the pump is securely
mounted. Check that the pump is properly lubri
cated (see LUBRICATION in MAINTENANCE
AND REPAIR).
This pump is self‐priming, but the pump should
never be operated unless there is liquid in the
pump casing.
Never operate this pump unless there is
liquid in the pump casing. The pump will
not prime when dry. Extended operation of
a dry pump will destroy the seal assembly.
Add liquid to the pump casing when:
1. The pump is being put into service for the
first time.
2. The pump has not been used for a consider
able length of time.
3. The liquid in the pump casing has evapo
rated.
Once the pump casing has been filled, the pump
will prime and reprime as necessary.
After filling the pump casing, reinstall
and tighten the fill plug. Do not attempt
to operate the pump unless all connect
ing piping is securely installed. Other
wise, liquid in the pump forced out un
der pressure could cause injury to per
sonnel.
To fill the pump, remove the pump casing fill cover
or fill plug in the top of the casing, and add clean
liquid until the casing is filled. Replace the fill cover
or fill plug before operating the pump.
NOTE
If the suction or discharge piping is open, a hose
can be used to fill the casing through the piping.

OM-06190 SUPER T SERIES
OPERATIONPAGE C - 2
STARTING
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.
Consult the operations manual furnished with the
engine.
Manual Starting
On initial start‐up, set the engine speed at the half‐
throttle position. Turn the keyswitch on the control
box to the “START” position until the engine starts.
Release the key and the switch will return to the
“RUN” position.
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 per
formance range shown on the curve on
page E‐1.
Automatic Starting
Install the float(s) or submersible transducer as de
scribed in INSTALLATION, Section B.
Follow the procedures outlined for manual starting
and throttle adjustment, then turn the key to the
“AUTO START” position.
NOTE
For security purposes, the key can be removed with
the switch in the “AUTO START” position.
Press and hold the white “AUTO” button on the
control panel until the red “AUTO” light illuminates.
The auto‐start system is now armed.
NOTE
The unit can continue to be started manually with
the keyswitch in the “AUTO START” position by
pressing the white “MAN” button on the control. The
“Single Lightning Bolt” light on the control will illu
minate in conjunction with an audible alarm before
the unit starts. The unit can then be stopped manu
ally by pressing the “OFF/SET” button.
In the auto‐start mode, the “Single Lightning Bolt”
light will illuminate in conjunction with an audible
alarm when the liquid level in the sump or wet well
rises and activates the float(s). The light will blink
and the alarm will sound for approximately 8 sec
onds before the unit starts.
When the liquid level in the sump or wet well is suffi
ciently pumped down, the unit will automatically
shut down.
NOTE
If the keyswitch is moved to the “OFF” position
while in the auto‐start mode, the engine will stop.
However, the auto‐start process will continue as
soon as the keyswitch is moved back to the “AUTO
START” position. To cancel the auto‐start process,
press the “OFF/SET” button.
The control panel is equipped with high oil temper
ature, low oil pressure, V‐belt and start failure (3 at
tempts) safety shutdowns. If any of these problems
occur, the red “Double Lightning Bolt” light will illu
minate to indicate a system fault. When the prob
lem is corrected, press the “OFF/SET” button to re
set the control.
NOTE
The “OFF/SET” button has dual functionality when
in program mode. If necessary, consult the factory
for details on programming functions.
The unit can be started manually with the key
switch in the “AUTO START” position by pressing
the white “MAN” button. The “Single Lightning
Bolt” light will illuminate in conjunction with an au
dible alarm before the unit starts.

OM-06190
SUPER T SERIES
OPERATION PAGE C - 3
Stop the unit manually by pressing the “OFF/SET”
button.
OPERATION
A Gorman‐Rupp automatic air release valve may
be installed in a bypass line, or the bypass line may
be left open.
A manual shut‐off valve should not be
installed in any bypass line. A manual
shut‐off valve may inadvertently be left
closed during operation. A pump which
has lost prime may continue to operate
without reaching prime, causing dan
gerous overheating and possible explo
sive rupture of the pump casing. Per
sonnel could be severely injured.
Lines With a Bypass
If a Gorman‐Rupp Automatic Air Release Valve has
been installed, the valve will automatically open to
allow the pump to prime, and automatically close
after priming is complete (see INSTALLATION for
Air Release Valve operation).
If the bypass line is open, air from the suction line
will be discharged through the bypass line back to
the wet well during the priming cycle. Liquid will
then continue to circulate through the bypass line
while the pump is in operation.
Lines Without a Bypass
Open all valves in the discharge line and start the
engine. Priming is indicated by a positive reading
on the discharge pressure gauge or by a quieter
operation. The pump may not prime immediately
because the suction line must first fill with liquid. If
the pump fails to prime within five minutes, stop it
and check the suction line for leaks.
After the pump has been primed, partially close the
discharge line throttling valve in order to fill the line
slowly and guard against excessive shock pres
sure which could damage pipe ends, gaskets,
sprinkler heads, and any other fixtures connected
to the line. When the discharge line is completely
filled, adjust the throttling valve to the required flow
rate.
Leakage
No leakage should be visible at pump mating sur
faces, or at pump connections or fittings. Keep all
line connections and fittings tight to maintain maxi
mum pump efficiency.
Liquid Temperature And Overheating
The maximum liquid temperature for this pump is
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 rup
ture or explode. If overheating occurs, stop the
pump and allow it to completely cool before servic
ing it. Refill the pump casing with cool liquid.
Allow an over‐heated pump to com
pletely cool before servicing. Do not re
move plates, covers, gauges, or fittings
from an over‐heated pump. Liquid with
in the pump can reach boiling tempera
tures, and vapor pressure within the
pump can cause parts being disen
gaged to be ejected with great force. Af
ter the pump completely cools, drain the
liquid from the pump by removing the
casing drain plug. Use caution when re
moving the plug to prevent injury to per
sonnel from hot liquid.
As a safeguard against rupture or explosion due to
heat, this pump is equipped with a pressure relief
valve which will open if vapor pressure within the
pump casing reaches a critical point. If over‐heat
ing does occur, stop the pump immediately and al
low it to cool before servicing it. Approach any
over‐heated pump cautiously. It is recom
mended that the pressure relief valve assembly be
replaced at each overhaul, or any time the pump