Pentair Aurora 3341 Operating instructions

NOTE! To the installer: Please make sure you provide this manual to the owner of the equipment or to the responsible
party who maintains the system.
MODELS 3341 AND 3344
END SUCTION PUMPS
INSTRUCTION, INSTALLATION, MAINTENANCE AND REPAIR MANUAL
Part # A-03-278 | © 2012 Pentair Ltd. | 12/01/12

CALIFORNIA PROPOSITION 65 WARNING:
Warning: This product and related accessories
contain chemicals known to the State of California to
cause cancer, birth defects or other reproductive harm.
INSTRUCTION, INSTALLATION, MAINTENANCE AND REPAIR MANUAL
MODELS 3341 AND 3344
END SUCTION PUMPS 6
SECTION 6ITEM 3340
DATED JULY 2005
SUPERSEDES SECTION 6ITEM 3340
DATED JANUARY 2004
IMPORTANT NOTE TO INSTALLER:
This manual contains important information about the
installation, operation and safe use of this product. This
information should be given to the owner/operator of this
equipment.
APPLICATIONS:
The 3340 Series pumps are frame mounted or close coupled.
They feature high efficiency, rugged construction, foot mounted
volutes with back pullout power frames, center drop out spacer
coupling (optional) and re-greaseable ball bearings. The pump’s
bronze fitted construction is suitable for unheated domestic and
fresh water, condensate, boiler feed water, pressure boosting
and hydronic coiling and/or heating.
ATTENTION: SAFETY WARNINGS:
Read and understand all warnings before installation or servic-
ing pump.
OPERATIONAL LIMITS: *
Maximum Operating Pressure: 175 psi at Temperatures
to 150OF (65.6°C)
Maximum Operating Temperature: 225°F (107°C)
* See ASTM A126/ANSI B16.1 for pressure/temperature rat-
ings of flanges.
ELECTRICAL SAFETY:
HIGH TEMPERATURE SAFETY:
HIGH PRESSURE SAFETY:
INSTALLATION
Read and understand all safety warnings at the beginning of
the manual before beginning installation or any repair
work.
PUMP LOCATION. You probably have spent considerable
time planning where your pump will be located. However you
may have overlooked some factor that may affect pump opera-
tion or efficiency.
The pump should be located as close to the liquid source as pos-
sible so that the suction line can be short and direct. It should be
located in a clean, open area, where it is easily accessible for
inspection, disassembly and repair. Pumps installed in dark, dirty
areas or in cramped locations are often neglected which can
Warning: Electrical Shock Hazard
All electrical connections are to be made by a qualified elec-
trician in accordance with all codes and ordinances. Failure
to follow these instructions could result in serious personal
injury, death or property damage.
Warning: Electrical Overload Hazard
Insure all motors have properly sized overload protection.
Failure to follow these instructions could result in serious
personal injury, death or property damage.
Warning: Sudden Start-Up Hazard
Disconnect and lockout power source before servicing.
Failure to follow these instructions could result in serious
personal injury, death or property damage.
Warning: Hot Surface Hazard
If pumping hot water, insure guards or proper insulation is
installed to protect against skin contact with hot piping or
pump components. Failure to follow these instructions could
result in serious personal injury, death or property damage.
Warning: Spraying Water Hazard
When servicing pump replace all gaskets and seals. Do not
re-use old gaskets or seals. Failure to follow these instruc-
tions could result in serious personal injury, death or proper-
ty damage.
Warning: High Pressure Hazard
The pump is rated at a maximum of 175 psi at 150°F. Do
not exceed this pressure. Install properly sized pressure
relief valves in system. Failure to follow these instructions
could result in serious personal injury, death or property
damage.
Warning: Expansion Hazard
Water expands when heated. Install properly sized thermal
expansion tanks and relief valves. Failure to follow these
instructions could result in serious personal injury, death or
property damage.
INSTRUCTION, INSTALLATION, MAINTENANCE AND REPAIR MANUAL
MODELS 3341 AND 3344
END SUCTION PUMPS 6
SECTION 6ITEM 3340
DATED JULY 2005
SUPERSEDES SECTION 6ITEM 3340
DATED JANUARY 2004
IMPORTANT NOTE TO INSTALLER:
This manual contains important information about the
installation, operation and safe use of this product. This
information should be given to the owner/operator of this
equipment.
APPLICATIONS:
The 3340 Series pumps are frame mounted or close coupled.
They feature high efficiency, rugged construction, foot mounted
volutes with back pullout power frames, center drop out spacer
coupling (optional) and re-greaseable ball bearings. The pump’s
bronze fitted construction is suitable for unheated domestic and
fresh water, condensate, boiler feed water, pressure boosting
and hydronic coiling and/or heating.
ATTENTION: SAFETY WARNINGS:
Read and understand all warnings before installation or servic-
ing pump.
OPERATIONAL LIMITS: *
Maximum Operating Pressure: 175 psi at Temperatures
to 150OF (65.6°C)
Maximum Operating Temperature: 225°F (107°C)
* See ASTM A126/ANSI B16.1 for pressure/temperature rat-
ings of flanges.
ELECTRICAL SAFETY:
HIGH TEMPERATURE SAFETY:
HIGH PRESSURE SAFETY:
INSTALLATION
Read and understand all safety warnings at the beginning of
the manual before beginning installation or any repair
work.
PUMP LOCATION. You probably have spent considerable
time planning where your pump will be located. However you
may have overlooked some factor that may affect pump opera-
tion or efficiency.
The pump should be located as close to the liquid source as pos-
sible so that the suction line can be short and direct. It should be
located in a clean, open area, where it is easily accessible for
inspection, disassembly and repair. Pumps installed in dark, dirty
areas or in cramped locations are often neglected which can
Warning: Electrical Shock Hazard
All electrical connections are to be made by a qualified elec-
trician in accordance with all codes and ordinances. Failure
to follow these instructions could result in serious personal
injury, death or property damage.
Warning: Electrical Overload Hazard
Insure all motors have properly sized overload protection.
Failure to follow these instructions could result in serious
personal injury, death or property damage.
Warning: Sudden Start-Up Hazard
Disconnect and lockout power source before servicing.
Failure to follow these instructions could result in serious
personal injury, death or property damage.
Warning: Hot Surface Hazard
If pumping hot water, insure guards or proper insulation is
installed to protect against skin contact with hot piping or
pump components. Failure to follow these instructions could
result in serious personal injury, death or property damage.
Warning: Spraying Water Hazard
When servicing pump replace all gaskets and seals. Do not
re-use old gaskets or seals. Failure to follow these instruc-
tions could result in serious personal injury, death or proper-
ty damage.
Warning: High Pressure Hazard
The pump is rated at a maximum of 175 psi at 150°F. Do
not exceed this pressure. Install properly sized pressure
relief valves in system. Failure to follow these instructions
could result in serious personal injury, death or property
damage.
Warning: Expansion Hazard
Water expands when heated. Install properly sized thermal
expansion tanks and relief valves. Failure to follow these
instructions could result in serious personal injury, death or
property damage.
INSTRUCTION, INSTALLATION, MAINTENANCE AND REPAIR MANUAL
MODELS 3341 AND 3344
END SUCTION PUMPS 6
SECTION 6ITEM 3340
DATED JULY 2005
SUPERSEDES SECTION 6ITEM 3340
DATED JANUARY 2004
IMPORTANT NOTE TO INSTALLER:
This manual contains important information about the
installation, operation and safe use of this product. This
information should be given to the owner/operator of this
equipment.
APPLICATIONS:
The 3340 Series pumps are frame mounted or close coupled.
They feature high efficiency, rugged construction, foot mounted
volutes with back pullout power frames, center drop out spacer
coupling (optional) and re-greaseable ball bearings. The pump’s
bronze fitted construction is suitable for unheated domestic and
fresh water, condensate, boiler feed water, pressure boosting
and hydronic coiling and/or heating.
ATTENTION: SAFETY WARNINGS:
Read and understand all warnings before installation or servic-
ing pump.
OPERATIONAL LIMITS: *
Maximum Operating Pressure: 175 psi at Temperatures
to 150OF (65.6°C)
Maximum Operating Temperature: 225°F (107°C)
* See ASTM A126/ANSI B16.1 for pressure/temperature rat-
ings of flanges.
ELECTRICAL SAFETY:
HIGH TEMPERATURE SAFETY:
HIGH PRESSURE SAFETY:
INSTALLATION
Read and understand all safety warnings at the beginning of
the manual before beginning installation or any repair
work.
PUMP LOCATION. You probably have spent considerable
time planning where your pump will be located. However you
may have overlooked some factor that may affect pump opera-
tion or efficiency.
The pump should be located as close to the liquid source as pos-
sible so that the suction line can be short and direct. It should be
located in a clean, open area, where it is easily accessible for
inspection, disassembly and repair. Pumps installed in dark, dirty
areas or in cramped locations are often neglected which can
Warning: Electrical Shock Hazard
All electrical connections are to be made by a qualified elec-
trician in accordance with all codes and ordinances. Failure
to follow these instructions could result in serious personal
injury, death or property damage.
Warning: Electrical Overload Hazard
Insure all motors have properly sized overload protection.
Failure to follow these instructions could result in serious
personal injury, death or property damage.
Warning: Sudden Start-Up Hazard
Disconnect and lockout power source before servicing.
Failure to follow these instructions could result in serious
personal injury, death or property damage.
Warning: Hot Surface Hazard
If pumping hot water, insure guards or proper insulation is
installed to protect against skin contact with hot piping or
pump components. Failure to follow these instructions could
result in serious personal injury, death or property damage.
Warning: Spraying Water Hazard
When servicing pump replace all gaskets and seals. Do not
re-use old gaskets or seals. Failure to follow these instruc-
tions could result in serious personal injury, death or proper-
ty damage.
Warning: High Pressure Hazard
The pump is rated at a maximum of 175 psi at 150°F. Do
not exceed this pressure. Install properly sized pressure
relief valves in system. Failure to follow these instructions
could result in serious personal injury, death or property
damage.
Warning: Expansion Hazard
Water expands when heated. Install properly sized thermal
expansion tanks and relief valves. Failure to follow these
instructions could result in serious personal injury, death or
property damage.
1

MODELS 3341-3344
2
result in premature failure of both the pump and the driver.
The Aurora 3340 pump must be installed horizontally. Install
isolating valves on each side of pump so pump maintenance can
be performed without draining the system. Special mounting
requirements may be required if the pump is to be mounted near
a noise or vibration sensitive area.
The installation must be evaluated to ensure that the net positive
suction head available (NPSHA) meets or exceeds the net posi-
tive suction head required (NPSHR), as stated by the pump per-
formance curve.
FOUNDATION. The foundation for your pump must be suffi-
ciently rigid to absorb any vibration and stress encountered dur-
ing pump operation. A raised foundation of concrete is prefer-
able for most floor mounted pumps. The raised foundation
assures a satisfactory base, protects against flooding, simplifies
moisture drainage, and facilitates keeping the area clean.
Your pump should be firmly bolted to the foundation, whether it
is a raised concrete base, steelwork wall, or structural member.
The mounting bolts or lag-screws should be accurately located
per the applicable Aurora dimension sheet. Refer Fig. 1.
LEVELING THE PUMP. Leveling the pump will require
enough shims to support the base plate near the foundation
bolts, and at any points of the base plate carrying a substantial
weight load. The shims should be large enough to allow a gap
of 3/4" to 1-1/2"' between the base plate and foundation for
grouting.
IMPORTANT:The pump base must be set level to avoid any
mechanical difficulties with the pump or motor. The 3340 pump
was properly aligned, if supplied with a motor, at the factory.
However, since the pump base is flexible, it my spring and twist
during shipment. Do not pipe the pump until it is realigned .
Realign the base, after piping is completed and after the pump is
grouted in and bolted down. NOTE: It may be necessary to
readjust the alignment from time to time while the unit and
foundation are new. Realignment will prevent premature bear-
ing failure, excessive vibration or shaft failure.
Insure that proper hydronic accessories such as pressure relief
valves, thermal expansion tanks and flow/pressure control
devices are installed in the system. Consult the responsible
party for your system to insure these devises are installed and of
the proper size.
GROUTING THE INSTALLATION. Grouting the base plate
prevents lateral movement of the base plate, and improves the
vibration absorbing characteristics of the foundation by increas-
ing its mass. A wooden dam should be constructed around the
base plate to contain the grout while it is being poured. The dam
can be built tight against the base plate, or slightly removed
from it as desired. Refer Fig. 2.
The entire base plate should be completely filled with non-
shrinkable type grout. The grout should be puddled frequently
to remove any air bubbles from the grout.
ROTATION: Pump rotation is clockwise when viewed from the
SHIMS
SHIMS
FOUNDATION BOLT GROUTING CLEARANCE
PIPE
DRIVER
FLEXIBLE COUPLING
POWER FRAME
PUMP
BASE PLATE
CONCRETE
FOUNDATION
Figure 1. Foundation for Frame Mounted Pumps.
STRAIGHT EDGE
PARALLEL MISALIGNMENT ANGULAR MISALIGNMENT
WEDGE OR
THICKNESS GAUGE
PERFECT ALIGNMENT
Figure 3. Flexible Coupling Alignment.
Warning: Sudden Start-Up Hazard
Disconnect and lockout power source before servicing.
Failure to follow these instructions could result in serious
personal injury, death or property damage.
SHIMS TO LEVEL BASEPLATE
WOODEN DAM
ON BOTH ENDS
TWISTED TENSION WIRE
ROLLED STEEL BASE
FOUNDATION BOLTS
SOUPY GROUT
Figure 2. Grouting the Base for Frame Mounted Pumps.
2

MODELS 3341-3444
3
back of the motor. An arrow is also located on the pump to
show the direction of rotation.
INITIAL ALIGNMENT OF THE FLEXIBLE COUPLING.
The pump and driver were accurately aligned at the factory.
However, it is impossible to maintain this alignment during
shipping and handling. Therefore it will be necessary for you to
realign the pump and driver. Flexible couplings are not univer-
sal joints. They should not be used to compensate for misalign-
ment of the pump and motor shafts. Their function is to transmit
power from the driver to the pump while compensating for ther-
mal expansion and shaft end movement. The coupling faces
should be far enough apart so that they do not make contact
when the motor shaft is forced to the limit of the bearing clear-
ance toward the pump shaft.
In order to properly align the coupling, you will need a taper
gauge or set of feeler gauges, and a straight edge.
There are two types of misalignment encountered with flexible
couplings: angular misalignment, in which the shafts are not
parallel, and parallel misalignment where the shafts are parallel
but not on the same axis.
To check angular alignment, insert a feeler gauge or taper gage
at any four places 90° apart around the coupling halves. Insert
shims under the driver feet until the same reading is obtained at
all four check points. The pump and driver will then be in angu-
lar alignment.
To check parallel alignment, a straight edge should be held
against the edges of the coupling halves at any four places 90°
apart around the coupling. The straight edge should be parallel
to the pump and driver shafts at all times. Insert shims until the
straight edge lies flat against both coupling halves at all four
checkpoints. The pump and driver will then be in proper paral-
lel alignment. Refer Fig. 3.
For fine alignment, 3500 RPM operation, for all other cou-
pler types.
A dial indicator should be used when greater alignment accura-
cy is required. Use the following alignment tolerances unless
specified otherwise by the coupling manufacturer. On sleeve
type couplings make sure there is at least 1/8” end clearance
between the sleeve and the two coupling halves.
To check angular misalignments, mount the dial indicator base
to the coupling half, and position the dial indicator button on the
front or rear face of the opposite coupling half. Set the dial to
zero, rotate both coupling halves together, making sure the indi-
cator button always indicates off the same spot. Misalignment
values within 0.004 inches TIR per inch of coupler radius is
permissible.
To check parallel misalignment, mount the dial indicator base to
one coupling half, or shaft and position the dial indicator button
on the outside diameter of the opposite coupling half. Set the
dial to zero. Rotate both coupling halves together, making sure
the indicator button always indicates off the same spot.
Misalignment withing 0.004 inches TIR is permissible.
PIPING:
SUCTION PIPING. The suction piping should be short, but no
less than ten pipe diameters in length, and direct with as few
elbows and fittings as possible to keep head loss, from friction,
at a minimum. However, the suction pipe should provide a min-
imum uninterrupted length, equal to ten pipe diameters, to the
pump suction flange. A horizontal suction line should have a
gradual rise to the pump, and pass under any interfering piping.
The suction pipe diameter should be at least the same diameter
as the suction nozzle on the pump, and preferably larger. Use of
a smaller diameter pipe will result in loss of head due to fric-
tion. All joints must be tight to maintain prime on the pump.
REDUCERS. Eccentric reducers should be installed directly at
the suction nozzle, with the taper at the bottom to prevent air
pockets from forming. Straight taper reducers should never be
used in a horizontal suction line because of the air pocket that is
formed at the leg of the reducer and the pipe. Refer Fig. 4.
DISCHARGE PIPING. Discharge piping should also be short
and direct as possible, with few elbows and fittings, to reduce
head loss from friction.
PIPE. The discharge pipe diameter should be the same as, or
larger than, the discharge nozzle diameter.
DISCHARGE VALVES. The discharge piping should include a
check valve and a gate valve. The check valve should be located
between the gate valve and the pump. If an increaser is used in
the discharge piping, the increaser should be installed between
the pump nozzle and the check valve. The check valve protects
against a reverse flow of the liquid if the driver fails.
Refer Fig. 5.
The gate valve is used in the priming operation, as a throttling
valve to control pump volume, and to shut down the pump for
inspection and maintenance
CORRECT
DISCHARGE
SUCTION
DISCHARGE
SUCTION
INCORRECT
ECCENTRIC
TAPERED
REDUCER AIR
POCKET
ELBOW
ECCENTRIC
TAPERED
REDUCER
Figure 4. Installation of Tapered Reducers.
SUCTION
CHECK
VAL
VE
DISCHARGE
PIPING
GATE
VALVE
Figure 5. Gate Valve and Check Valve.
3

LUBRICATION:
In dry locations, each bearing will need lubrication at least after
every 4,000 hours of running time or 6 to 12 months, whichever
is more frequent. In wet locations (exposed to dripping water, to
the weather or to heavy condensation found in unheated or
poorly ventilated underground locations) every 2,000 hours or
every 3 to 6 months, whichever is more frequent.
Use Chevron SRI, NLGI2.
Lubricate motor per motor manufacturer’s instructions.
GENERAL INSTRUCTIONS:
1. Keep this pump and motor properly lubricated.
2. When there is a danger of freezing, drain the pump.
3. Inspect the pump regularly for leaky seals of gaskets and
loose or damaged components. Replace or repair as required.
ELECTRICAL WIRING. Normally, your pump will be sup-
plied with an attached drive motor. The motor should be wired
in accordance with the wiring diagram found on the motor
nameplate. Be sure the voltage, frequency, and phase of your
power supply corresponds with the name plate data. It is advis-
able to provide a separate switch and overload protection for
your pump motor to protect against power failure in some other
area. Conversely, if the pump motor develops electrical prob-
lems, it will be isolated from other equipment.
PRESTARTING INSTRUCTION. The coupling halves should be
connected. Prior to connection however, the drive motor should
be started to make sure the direction of rotation is the same as the
direction indicated by the arrow on the pump casing.
PUMP DISASSEMBLY: For frame mounted pumps, model
3344.
Read and understand all safety warnings at the beginning of
the manual before beginning installation or any repair
work.
1. Insure the electrical power is locked out, the system pressure
has been lowered to 0 psi and temperature of the unit is at a
safe level before beginning any disassembly of the pump.
2. Isolate the pump from the system by closing the valves that
should be located on both the suction and discharge of the
pump. Loosen the drain plug at the bottom of the casing and
drain the pump.
Inspect removed parts at disassembly to determine if they can be
reused. Ball bearings that turn roughly or show wear should be
replaced. Cracked castings should never be reused. Scored or
worn pump shafts should be replaced. Gaskets should be replaced
at reassembly simply as a matter of economy. They are much less
expensive to replace routinely than to replace singly as the need
arises.
3. Remove the coupling guard.
4. Loosen the set screws in both coupling halves and slide each
half back, as far as possible on its shaft. Then, remove the
coupling sleeve.
5. Remove the two foot support capscrews. Loosen, but do not
remove the volute capscrews (5). Use capscrew in the jack
screw holes to loosen the pump assembly from the volute.
6. Now remove the volute capscrews (5) and remove the pump
assembly from the volute.
7. Remove the impeller capscrew (9), lockwasher (9A) and
impeller washer gasket (9B). Remove impeller (11).
8. Remove impeller key (12).
9. Remove the rotating portion of the mechanical seal (head).
10. Remove the seal insert along with the insert gasket and
retainer (if used).
11. Remove the shaft sleeve gasket (10).
12. Thoroughly clean the shaft sleeve and seal plate seal cavity.
Replace the shaft sleeve (25) or seal plate (35) if there is
evidence of surface damage like pitting, corrosion, nicks or
scratches.
13. Lubricate the shaft sleeve and seal plate with soap and water
or P-80 rubber emulsion. Do not use petroleum lubricant.
Install a new insert gasket and a new seal insert down into
the seal plate.
14. Slide a new rotating seal assembly (27) on to the shaft
sleeve. With a screwdriver, push the top of the compression
MODELS 3341-3344
4
Warning: Sudden Start-Up Hazard
Disconnect and lockout power source before servicing.
Failure to follow these instructions could result in serious
personal injury, death or property damage.
Warning: Hot Surface Hazard
If pumping hot water, insure guards or proper insulation is
installed to protect against skin contact with hot piping or
pump components. Failure to follow these instructions could
result in serious personal injury, death or property damage.
Warning: High Pressure Hazard
The pump is rated at a maximum of 175 psi at 150°F. Do
not exceed this pressure. Install properly sized pressure
relief valves in system. Failure to follow these instructions
could result in serious personal injury, death or property
damage.
Warning: Spraying Water Hazard
When servicing pump replace all gaskets and seals. Do not
re-use old gaskets or seals. Failure to follow these instruc-
tions could result in serious personal injury, death or proper-
ty damage.
Warning: High Pressure Hazard
Make certain that the internal pressure of the pump is
relieved before continuing. Failure to follow the instructions
could result in serious person injury, death, or property
damage.
4

ring until the seal is tight against the seal insert. Install seal
spring.
The mechanical seal (see Figure 6) (27) is a precision
product and must be treated as such. During installation,
great care must be taken to avoid dropping any part of
the seal. Take particular care not to scratch the lapped
faces on the washer or the sealing seat.
15. Install a new sleeve gasket (10).
16. Install a new impeller key (12).
17. Install impeller, impeller washer (9A), new impeller washer
gasket (9B), lock washer (9C), and capscrew (9). Tighten
capscrew per torque chart (see Table 1).
18. Install new casing gasket (8). Then install the pump assem-
bly into the volute.
19. Tighten volute capscrews (5) per torque chart (see Table 1).
20. Install foot support capscrews (62) and tighten per torque
chart (see Table 1).
21. Install coupling and align.
22. Install drain plugs, close drain valve.
23. Reinstall the coupling guard.
24. Open isolation valves and inspect pump for leaks.
25. Return pump to service.
POWER FRAME OR PUMP SHAFT
DISASSEMBLY/REPLACEMENT:
Read and understand all safety warnings at the beginning of
the manual before beginning installation or any repair
work.
1. Insure the electrical power is locked out, the system pressure
has been lowered to 0 psi and temperature of the unit is at a
safe level before beginning any disassembly of the pump.
2. Isolate the pump from the system by closing the valves that
should be located on both the suction and discharge of the
pump. Loosen the drain plug at the bottom of the casing and
drain the pump.
Inspect removed parts at disassembly to determine if they can
be reused. Ball bearings that turn roughly or show wear should
be replaced. Cracked casings should never be used. Scored or
worn pump shafts should be replaced. Gaskets should be
replaced at reassembly simply as a matter of economy. The are
much less expensive to replace routinely than to replace singley
as the need arises.
3. Remove coupling guard.
4. Loosen the setscrews in both coupler halves and slide each
half back as far as possible, on it’s shaft. Then remove the
coupler sleeve.
5. Remove the two foot support capscrews (62). Loosen, but
do not remove, the volute capscrews (5). Begin to remove
the pump assembly from the volute by placing jackscrews
in the jackscrew holes for leverage.
6. Now remove the volute capscrews (5) and remove the pump
assembly from the volute.
7. Remove the impeller capscrew (9), lockwasher (9A),
impeller washer gasket (9B). Remove impeller.
MODELS 3341-3344
5
Table 1. Torque Chart
Warning: Sudden Start-Up Hazard
Disconnect and lockout power source before servicing.
Failure to follow these instructions could result in serious
personal injury, death or property damage.
CAPSCREW TORQUE FOR COMMON BOLT DIAMETERS
CAPSCREW HEAD IN-POUNDS FOOT-POUNDS
TYPE MARKING 1/4” 5/16” 3/8” 7/16” 1/2” 5/8” 3/4”
SAE Grade 5 85 180 27 43 65 130 230
UNITS M4 M6 M8 M10 M12 M14 M16
DIN CLASS 8.8 KILOGRAM .57 1 2.5 5 8 13 20
(SAE Grade 5) METERS
FT-LBS 4 7 18 32 58 94 144
8.8
Warning: Hot Surface Hazard
If pumping hot water, insure guards or proper insulation is
installed to protect against skin contact to hot piping or
pump components. Failure to follow these instructions could
result in serious personal injury, death or property damage.
Warning: High Pressure Hazard
Make certain that the internal pressure of the pump is
relieved before continuing. Failure to follow the instructions
could result in serious person injury, death, or property
damage.
CAUTION
5

MODELS 3341-3344
6
8. Remove impeller key (12).
9. Remove the rotating portion of the mechanical seal (head).
10. Remove the seal insert along with the insert gasket and
retainer (if used).
11. Remove the shaft sleeve gasket (10) and shaft sleeve (25).
12. Remove the power frame capscrews and bearing/shaft
assembly from the seal plate. If the power frame assembly is
being replaced, skip to Step 24. If replacing the shaft, con-
tinue to Step 13.
13. Remove the grease fittings (43) from the power frame.
14. Remove the bearing capscrews (32) and remove the bearing
cap (49).
15. Remove the shaft/bearing assembly from the power frame,
and then remove snap ring from inboard bearing.
16. Press the ball bearings off the shaft by pressing the inner
race only. Normally, old bearings should be replaced, or at
least regreased. See Page 4 for lubrication instructions
before installing on the new shaft.
17. Press the new or regreased bearings (53,54) onto the shaft as
far as they can go.
18. Replace the snap ring (52) and reinstall the shaft/bearing
assembly into the power frame.
19. Remove any oil or dirt from the shaft sleeve. Replace the
shaft sleeve (25) if there is evidence of surface damage like
pitting, nicks or scratches.
20. Install the shaft sleeve (25) on to the shaft.
21. Install a new shaft sleeve gasket (10).
22. Reinstall the bearing cap (49). Refasten bearing capscrews
(28) and tighten per the torque chart (see Table 1).
23. Fasten the grease fittings into the power frame.
24. Assemble the power frame assembly onto the seal plate (if
required) and tighten the power frame bolts per torque chart
(see Table 1).
25. Thoroughly clean the seal plate seal cavity. Inspect for sur-
face damage like pitting, corrosion, nicks or scratches.
Replace the seal plate (35) if necessary.
26. Slide a new rotating seal assembly (27) on to the shaft
sleeve with a screw driver, push the top of the compression
ring until the seal is tight against the seal insert.
27. Lubricate the shaft sleeve and cover plate with soapy water
or P-80 rubber emulsion. Do not use petroleum lubricant.
Install a new cup gasket and a new seal insert down into the
seal plate.
The mechanical seal (see Figure 6) (27) is a precision
product and must be treated as such. During installation,
great care must be taken to avoid dropping any part of
the seal. Take particular care not to scratch the lapped
faces on the washer or the sealing seat.
28. Install new impeller key (12).
29. Install impeller, impeller washer (9A), new impeller washer
gasket (9B), lock washer (9C) and capscrew (9). Tighten
capscrew per torque chart (see Table 1).
30. Scrape off all particles of the old volute gasket off the cas-
ing and the seal plate. Replace the gasket (8) with a new
one.
31. Install pump assembly into the volute (6).
32. Tighten volute capscrews (5) per torque chart (see Table 1).
33. Install coupling and align. Follow directions located under
initial alignment on Page 3.
34. Install drain plug (4), close drain valve.
35. Reinstall the coupling guard.
CAUTION
FLEXIBLE CUP
STATIONARY SEAT
WASHER
FLEXIBLE BELLOWS
RETAINER
DRIVE RING
SPRING
Figure 6. Mechanical Seal.
6

MODELS 3341-3344
7
36. Open isolation valves and inspect pump for leaks.
37. Return pump to service.
PUMP DISASSEMBLY FOR CLOSED COUPLED
PUMPS, model 3341:
Read and understand all safety warnings at the beginning of
the manual before beginning installation or any repair
work.
1. Insure the electrical power is locked out, the system pres-
sure has been lowered to 0 psi and temperature of the unit is
at a safe level before beginning any disassembly of the
pump.
2. Isolate the pump from the system by closing the valves that
should be located on both the suction and discharge of the
pump. Loosen the drain plug at the bottom of the casing and
drain the pump.
Inspect removed parts at disassembly to determine if they can
be reused. Ball bearings that turn roughly or show wear should
be replaced. Cracked casings should never be used. Scored or
worn pump shafts should be replaced. Gaskets should be
replaced at reassembly simply as a matter of economy. The are
much less expensive to replace routinely than to replace singley
as the need arises.
3. Remove motor foot capscrews (62). Loosen the volute cap-
screws (5), but do not remove them. Using the capscrews in
the jackscrew holes, start to remove the pump assembly
from the volute (6).
4. Remove the volute capscrews (5) and remove the pump
assembly.
5. Remove the impeller capscrew (9), impeller washer (9A),
impeller washer gasket (9B), and lockwasher.
6. Remove impeller key (12).
7. Remove the impeller (11).
8. Remove the rotating portion of the mechanical seal (head).
9. Thoroughly clean the shaft sleeve and the seal plate seal
cavity. Replace the shaft sleeve (25) or seal plate (35) if
there is evidence of surface damage like pitting, corrosion,
nicks or scratches.
10. Lubricate the shaft sleeve and seal plate with soapy water
or P-80 rubber emulsion. Do not use petroleum lubricant.
Install a new insert gasket and a new seal insert down into
the cup.
11. Slide a new rotating seal assembly (27) onto the shaft
sleeve. With a screwdriver, push the top of the compression
ring until the seal is tight against the seal insert. Install seal
spring.
The mechanical seal (see Figure 6) (27) is a precision
product and must be treated as such. During installation,
great care must be taken to avoid dropping any part of
the seal. Take particular care not to scratch the lapped
faces on the washer or the sealing seat.
12. Install a new sleeve gasket (10).
13. Install impeller, new impeller washer gasket (9B), impeller
washer (9A), lock washer (9C), and capscrew (9).
14. Install a new casing gasket (8), Then install the pump
assembly into volute (6).
15. Tighten volute capscrews (5). Tighten volute per torque
chart (see Table 1).
16. Install drain plugs (4), close drain valve.
17. Open isolation valves and inspect pump for leaks.
18. Return pump to service.
Warning: Sudden Start-Up Hazard
Disconnect and lockout power source before servicing.
Failure to follow these instructions could result in serious
personal injury, death or property damage.
Warning: Hot Surface Hazard
If pumping hot water, insure guards or proper insulation is
installed to protect against skin contact to hot piping or
pump components. Failure to follow these instructions could
result in serious personal injury, death or property damage.
Warning: High Pressure Hazard
The pump is rated at a maximum of 175 psi at 150°F. Do
not exceed this pressure. Install properly sized pressure
relief valves in system. Failure to follow these instructions
could result in serious personal injury, death or property
damage.
Warning: Spraying Water Hazard
When servicing pump replace all gaskets and seals. Do not
re-use old gaskets or seals. Failure to follow these instruc-
tions could result in serious personal injury, death or proper-
ty damage.
Warning: High Pressure Hazard
Make certain that the internal pressure of the pump is
relieved before continuing. Failure to follow the instructions
could result in serious person injury, death, or property
damage.
CAUTION
7

8
4. Pipe Plug
5. Capscrew
6. Casing
8. Gasket
9. Impeller Screw
9A. Washer
9B. Gasket
9C. Capscrew Seal
10. Gasket
11. Impeller
MODEL 3344 LIST OF PARTS
12. Impeller Key
25. Sleeve
27. Seal
32. Capscrew
33. Screw
34. Nameplate
35. Seal Plate
42. Key
43. Grease Fitting
48. Capscrew
49. Bearing Cap
52. Retaining Ring
53. Bearing
54. Bearing
55. Shaft
57. Frame
62. Capscrew
63. Washer
64. Support
4. Pipe Plug
5. Capscrew
6. Casing
8. Gasket
9. Impeller Screw
9A. Washer
9B. Gasket
9C. Capscrew Seal
10. Gasket
11. Impeller
MODEL 3341 LIST OF PARTS
12. Impeller Key
25. Sleeve
27. Seal
32. Capscrew
33. Screw
34. Nameplate
35. Motor Bracket
35A. Seal Plate
48. Capscrew
63 Washer
NOTES:
1. BRONZE FITTED CONSTRUCTION WILL BE FURNISHED
2. AURORA PUMP RESERVES THE RIGHT TO SUBSTITUTE MATERIALS
WITHOUT NOTICE
NOTE
WHEN ORDERING SPARE PARTS ALWAYS INCLUDE THE
PUMP TYPE, SIZE, SERIAL NUMBER, AND THE PIECE
NUMBER FROM THE EXPLODED VIEW IN THIS MANUAL.
ORDER ALL PARTS FROM YOUR LOCAL AUTHORIZED DISTRIBUTOR,
OR THE FACTORY AT NORTH AURORA, ILLINOIS.
8

9
MODELS 3341-3344
25
29
10
12
11
9B9A
9C
9
8
4
4
6
4
35
48
5
35A
34
32
33
63
Figure 7. Model 3341 Exploded View.
NOTE: Recommended spare parts shown in bold face type.
9

10
MODELS 3341-3344
25
27
10
12
11
9B 9A
9C
9
8
4
4
6
4
53
55
54
32
5
35
48
49
57
62
42
34
52
43
64
33
63
6
3
Figure 8. Model 3344 Exploded View.
NOTE: Recommended spare parts shown in bold face type.
10

WARRANTY
Seller warrants equipment (and its component parts) of its own manufacture against defects in materials and workmanship under normal use
and service for one (1) year from the date of installation or start-up, or for eighteen (18) months after the date of shipment, whichever occurs
first. Seller does not warrant accessories or components that are not manufactured by Seller; however, to the extent possible, Seller agrees to
assign to Buyer its rights under the original manufacturer's warranty, without recourse to Seller. Buyer must give Seller notice in writing of
any alleged defect covered by this warranty (together with all identifying details, including the serial number, the type of equipment, and the
date of purchase) within thirty (30) days of the discovery of such defect during the warranty period. No claim made more than 30 days after
the expiration of the warranty period shall be valid. Guarantees of performance and warranties are based on the use of original equipment
manufactured (OEM) replacement parts. Seller assumes no responsibility or liability if alterations, non-authorized design modifications
and/or non-OEM replacement parts are incorporated If requested by Seller, any equipment (or its component parts) must be promptly
returned to Seller prior to any attempted repair, or sent to an authorized service station designated by Seller, and Buyer shall prepay all
shipping expenses. Seller shall not be liable for any loss or damage to goods in transit, nor will any warranty claim be valid unless the
returned goods are received intact and undamaged as a result of shipment. Repaired or replaced material returned to customer will be
shipped F.O.B., Seller's factory. Seller will not give Buyer credit for parts or equipment returned to Seller, and will not accept delivery of
any such parts or equipment, unless Buyer has obtained Seller's approval in writing. The warranty extends to repaired or replaced parts of
Seller's manufacture for ninety (90) days or for the remainder of the original warranty period applicable to the equipment or parts being
repaired or replaced, whichever is greater. This warranty applies to the repaired or replaced part and is not extended to the product or any
other component of the product being repaired. Repair parts of its own manufacture sold after the original warranty period are warranted for
a period of one (1) year from shipment against defects in materials and workmanship under normal use and service. This warranty applies to
the replacement part only and is not extended to the product or any other component of the product being repaired. Seller may substitute
new equipment or improve part(s) of any equipment judged defective without further liability. All repairs or services performed by Seller,
which are not covered by this warranty, will be charged in accordance with Seller's standard prices then in effect.
THIS WARRANTY IS THE SOLE WARRANTY OF SELLER AND SELLER HEREBY EXPRESSLY DISCLAIMS AND BUYER
WAIVES ALL OTHER WARRANTIES EXPRESSED, IMPLIED IN LAW OR IMPLIED IN FACT, INCLUDING ANY WARRANTIES
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Seller's sole obligation under this warranty shall be, at its
option, to repair or replace any equipment (or its component parts) which has a defect covered by this warranty, or to refund the purchase
price of such equipment or part. Under the terms of this warranty, Seller shall not be liable for (a) consequential, collateral, special or
liquidated losses or damages; (b) equipment conditions caused by normal wear and tear, abnormal conditions of use, accident, neglect, or
misuse of said equipment; (c) the expense of, and loss or damage caused by, repairs or alterations made by anyone other than the Seller; (d)
damage caused by abrasive materials, chemicals, scale deposits, corrosion, lightning, improper voltage, mishandling, or other similar
conditions; (e) any loss, damage, or expense relating to or resulting from installation, removal or reinstallation of equipment; (f) any labor
costs or charges incurred in repairing or replacing defective equipment or parts, including the cost of reinstalling parts that are repaired or
replaced by Seller; (g) any expense of shipment of equipment or repaired or replacement parts; or (h) any other loss, damage or expense of
any nature.
The above warranty shall not apply to any equipment which may be separately covered by any alternate or special warranties.
PERFORMANCE: In the absence of Certified Pump Performance Tests, equipment performance is not warranted or guaranteed.
Performance curves and other information submitted to Buyer are approximate and no warranty or guarantee shall be deemed to arise as a
result of such submittal. All testing shall be done in accordance with Seller's standard policy under Hydraulic Institute procedures.
LIABILITY LIMITATIONS: Under no circumstances shall the Seller have any liability under the Order or otherwise for liquidated
damages or for collateral, consequential or special damages or for loss of profits, or for actual losses or for loss of production or progress of
construction, regardless of the cause of such damages or losses. In any event, Seller's aggregate total liability under the Order or otherwise
shall not exceed the contract price.
ACTS OF GOD: Seller shall in no event be liable for delays in delivery of the equipment or other failures to perform caused by fires, acts of
God, strikes, labor difficulties, acts of governmental or military authorities, delays in transportation or procuring materials, or causes of any
kind beyond Seller's control.
COMPLIANCE WITH LAW: Seller agrees to comply with all United States laws and regulations applicable to the manufacturing of the
subject equipment. Such compliance shall include: The Fair Labor Standards Acts of 1938, as amended; Equal Employment Opportunity
clauses of Executive Order 11246, as amended; Occupational Safety and Health Act of 1970 and the standards promulgated thereunder, if
applicable. Since compliance with the various Federal, State, and Local laws and regulations concerning occupational health and safety,
pollution or local codes are affected by the use, installation and operation of the equipment and other matters over which Seller has no
control, Seller assumes no responsibility for compliance with those laws and regulations, whether by way of indemnity, warranty, or
otherwise. It is incumbent upon the Buyer to specify equipment which complies with local codes and ordinances.
800 Airport Road
North Aurora, Illinois 60542
630-859-7000
www.aurorapump.com