MTH PUMPS T31 Series User manual

T31 SERIES
MTH PUMPS
401 West Main Street • Plano, IL 60545-1436
Section T31 Page 501
Dated January 2000
97-4621-01-588
Pump Manual
HORIZONTAL CLOSE COUPLED
FLEXIBLE COUPLED
Distributed by PumpBiz, Inc.
www.pumpbiz.com
1-800-PumpBiz (786-7249)

T31 SERIES
General Instructions
CLOSE COUPLED PUMPS
FLEXIBLE COUPLED PUMPS
A. Inspection of Equipment
B. Storage
C. Placing Stored Pumps Into
Service
D. ApplicationConsiderations
E. Recommended Spare Parts
When properly installed and given
reasonable care and maintenance,
regenerative turbine pumps should
operate satisfactorily for many years.
Because of the high differential pres-
sures expected in a regenerative turbine
pump, close running clearances are
used to reduce internal losses. Abrasive
particles, even microscopic ones in high
enough concentrations can open up the
close clearances between internal
cavities. For critical services it is
recommended that you keep an identical
pump for stand-by use.
1A Inspection of Equipment
Immediately upon receipt of the
shipment, inspect the equipment for
damage or missing components. Check
the shipping manifest and report any
damage or shortage to the Transporta-
tion Company’s local agent.
Put the instructions that came with the
shipment in a safe place where they will
be available to those who will be using
them for installation and service.
1B Storage
If the pump is to be stored before use, it
should be inspected as described in 1A,
recrated and stored in a dry location.
Standard shipping containers are not
suitable for outdoor storage. In some
areas, it may be necessary to cover the
pump's exterior surface with oil or other
rust inhibiting coating.
For storage beyond 30 days, Thylene
Glycol or another protective fluid must
be used inside the pump. Fluids used in
the pump should be selected for
compatibility with the pumps materials.
This is very important when optional
seal and gasket materials have been
used. Protective caps on the inlet and
outlets should also be used. Caps alone
are not sufficient protection.
1C Placing Stored Pumps Into Service
Special care must be taken when placing
stored pumps into service. First clean the
outside and flush out the inside. Try to turn
the pump using the shaft. If the impeller
does not break loose immediately, fill the
pump with water and try again in a few
hours. If this doesn't work, refer to
disassembly/reassembly instructions in
Section 5. Loosen the thrubolts clamping
the assembly together, three full turns, no
more. Fill the pump with water. Apply
torque, 50 foot pounds maximum, to the
shaft.
On close coupled units, access to the shaft
is between the pump and motor. A vise
grip or other plier type gripping device
may be used directly on the shaft.
Applying torque to the motor fan blades is
not recommended.
The pump should turn before the 50 foot
pounds is reached. Continue turning the
pump while tightening the thrubolts to their
original positions.
1D Application Considerations
1D1 Electrical Wiring
All electrical equipment and wiring should
conform to Local and National Electrical
Codes. Use the motor manufacturer’s
instructions for connecting the motor.
Note the correct rotation and wiring
diagrams on the assembly. Make sure the
motor rotation and speed matches that
required for the pump.
1D2 Construction Materials
While it is reasonable to assume that good
judgement has been used in selecting all
the materials in the pump for compatibility
with process fluids, actual conditions
sometimes vary from original expectations.
Also, typical material selection charts do
not consider all the temperature, pressure,
and fluid variables. The customer’s
engineer should be consulted for final
judgement on the best materials for critical
process applications.
1D3 Valves
The first valve to be considered for a
regenerative turbine pumping system
might be a pressure relief valve. Because
this type of pump has a horsepower
requirement similar to that of a positive
displacement pump (constantly rising
along with a pressure increase) a relief
valve can be effectively used to limit
horsepower. This is helpful when a non-
overloading motor is specified. It can be
of critical importance if the system flow
rate can vary widely. There are almost
no circumstances where a flow modulat-
ing valve will work successfully in a
regenerative turbine pumping system.
The steep pumping characteristic,
typical of these pumps, produces very
large pressure changes with small
variations in flow rate. As a result, the
modulating flow from the valve introduc-
es sharp pressure shock waves that
shorten pump life and may cause
damage in other pieces of equipment in
the system.
If a shutoff valve is necessary in the
suction line, use a gate, ball, butterfly, or
other full port valve. Globe or other flow
restricting valves can in some cases
reduce pump flow or increase chances
of cavitation.
A swing check valve is recommended in
the suction line even when the pump
inlet is only slightly higher than the fluid
source. It should be the same size as
the pump inlet or sized based on
reasonable fluid friction losses.
A foot valve is recommended when
lifting fluid from a sump. This will save
wear and tear on any pump, even those
equipped with self priming equipment.
A Y-Strainer is recommended immedi-
ately ahead of the pump on any newly
constructed system. This is advisable
due to the probability that foreign
material large enough to damage pump
clearances may remain even though the
piping has been flushed.
Valves in the outlet piping of a regenera-
tive turbine pump should always be
open as far as possible when the pump
is started. This will reduce the start-up
load on the pump and motor. Never
start the pump with the discharge
valve closed.
Inlet valving should be open when
starting any pumping system. Without
some fluid in the pump, it can gall and
lock up impellers. Violent pump failure
will result from continued operation
with the inlet valve closed.
1D4 Priming
Regardless of whether self-priming
equipment is used or not, always fill the
pump and vent it of air for best seal and
1.
Page 502

Page 503
pump life. Under most circumstances,
regenerative turbine pumps can be made
to self-prime as long as a small amount of
fluid can be recirculated through the
impeller and the fluid doesn’t heat up
noticeably.
1D5 NPSH (Net Positive Suction Head)
The NPSH required varies with every size
and capacity of pump. The NPSH
required by your unit can be obtained
from the performance curves or from your
MTH representative.
If the NPSH available is not equal to or
greater than that required by the pump, it
must be increased or a different pump
selected. The usual method for increas-
ing NPSH is to raise the static head on
the pump inlet, (Hs).
By definition, NPSH means: “net positive
suction head” above the vapor pressure
of the pumped liquid available at the
centerline of the pump. It should always
be given in feet of pumped liquid. The
NPSH is actually a measurement of the
amount of energy available in the pumped
liquid to produce the required absolute
entrance velocity in the pump. If a pump
requires more energy (or NPSH) than is
available at a given capacity, the pressure
at the inlet will fall below the vapor
pressure of the pumped liquid and loss of
performance will result.
Ps= Pressure in the suction vessel in
PSIA.
Pvp = Vapor pressure of the pumped fluid
in PSIA.
Hs= Static height of the pumped fluid
above (+) or below (-) the centerline
of the pump.
Hf= All friction losses from the vessel to
the pump.
NPSH = 2.31( )+ Hs- Hf
For boiling liquids, Psand Pvp are
equal. This item then becomes zero
and can be omitted from the equa-
tion.
1D6 Noise
Regenerative turbine pumps typically
produce a high pitched whine that
increases in intensity as the differen-
tial pressure produced in the pump
increases. While high frequency
sound is attenuated more easily than
lower frequencies, piping structures
and the fluids in them readily transmit
noise. Motors, bearings, and other
rotating components add to noise
and sometimes create objectionable
harmonics.
Careful pump installation can
contribute to noise reduction. Proper
alignment of the pump and driver is
essential.
Adequate supports for the inlet and
discharge piping is equally important.
A degree of noise reduction may be
obtained when the pumping unit is
supported free of building structures
by the use of vibration isolators,
flexible piping and conduit connec-
tions. Elastomer type couplings are
the best choice to separate motor
noises from the fluid and piping
structure.
1D7 Freezing
When ambient temperatures drop
below the freezing point of the fluid in
a pump, consideration should be
given to heating, insulating, or
draining the pump. If you choose
draining the pump, and it will only be
for a short period, first remove the
Ps- Pvp
sp. gr.
drain plugs and drain the lines to and from
the pump. Carefully blow out the pump
with compressed air to clear all internal
cavities of fluid.
1E Recommended Spare Parts
FOR CRITICAL SERVICES - a duplex
installation, with two identical pumping
units in parallel, is the safest and many
times the most cost effective choice.
FOR IMPORTANT SERVICES - a
standby pump, ready for installation is
advised.
Special pricing and new pump warranty is
offered for factory rebuilding. Turn
around time can be as short as one or two
days for standard models.
FOR ROUTINE MAINTENANCE - only
the mechanical seals and a complete set
of “O” ring gaskets are recommended.
Should additional components show wear,
they are available from stock at the
factory.
FOR SERVICING A PUMP THAT DOES
NOT PRODUCE RATED HEAD -
mechanical seals, “O” ring gaskets,
impeller, motor bracket, and cover.
FOR REBUILDING A PUMP - all the
components required for servicing plus
bearings, shaft, and drive keys for flexible
coupled pumps, should be obtained. (A
factory rebuild should be considered
whenever your disassembly indicates
rebuilding is necessary as this is usually
more economical.)
The factory recommendation for spare
parts are all of those needed for rebuild-
ing a pump and are shown on the
exploded view drawings for each individu-
al type of pump.

Page 504
sufficient mass to absorb all normal
vibrations. Locate the foundation
bolts using a layout or template in
relation to the suction and discharge
piping. If concrete is being used,
foundation bolts of the specified size
can be enclosed in a pipe sleeve two
to three diameters larger than the
bolts to compensate for minor
variations in alignment.
Close coupled pumps can be
mounted on a steel base prior to
installation or mounted directly to the
foundation. Place shims under one
or more of the motor feet so that
strain and distortion will not result
when the mounting bolts are
tightened.
2C Leveling (Flexible Coupled
Pumps Only)
If the unit is received with the pump
and motor mounted on the baseplate:
1. Place the unit in position.
2. Disconnect the coupling halves.
Do not reconnect until all align-
ment procedures have been
completed.
3. Support the baseplates on metal
shims or wedges having a small
taper. (Refer to Figure 2-2)
a. Place shims close to the
foundation bolts. (Refer to
Figure 2-2)
b. Place shims close to
where the greatest weight
is located.
4. Check the baseplate for
distortion:
Figure 2-1
Figure 2-2
T31 SERIES
2.
CLOSE COUPLED PUMPS
FLEXIBLE COUPLED PUMPS
A. Location
B. Foundation
C. Leveling
D. Alignment
E. Piping
In order to insure that pumping equipment
is installed properly and to obtain reliable
pump operation, it is recommended that
only experienced, qualified erecting
engineers undertake this task. Read the
instructions thoroughly before beginning.
2A Location
The first consideration for locating a pump
is elevation. The lowest possible
elevation using the shortest possible
suction piping is usually the best.
Questions regarding possible locations
should be resolved by making inlet head
calculations including all friction losses.
The one producing the highest inlet
pressure should be selected. One reason
for this precaution is that, the greater the
inlet pressure, the less likelihood of NPSH
problems. Also a flooded suction is
particularly helpful on start-up when the
seals or the entire pump can be ruined
because it is not properly primed and
purged of air.
A dry, easily accessible location is also
important. Allow ample clearance around
the unit for free air circulation. If a dry
location is not available, the pump can be
mounted on a foundation, above the floor.
Specify motor enclosure, pump materials,
or coatings to suit the worst conditions
expected. Place the pump so that it can
be easily inspected and serviced during
operation. Sufficient head room should
be provided, particularly when lifting
devices will be used for heavier assem-
blies.
2B Foundation
Baseplates alone are not rigid enough to
maintain alignment of the unit. The pump
foundation is used as a support for the
baseplate to maintain alignment of the
unit. If the baseplate is to be grouted to
the foundation, it is only necessary to
embed the edges. It is unnecessary to
completely fill under the baseplate. DO
NOT grout the unit to the foundation until
it has been properly aligned.
The foundation must be a permanent rigid
installation of concrete or other material of
Installation
Rotation
Outlet
Inlet
a. Place a straightedge
along the baseplate to determine if it
is distorted.
b. Adjust the shims until the
baseplate is not distorted.
5. Use a section of the pipe to determine
if the inlet and discharge openings are
vertical and located properly.
6. Correct the positions, if necessary, by
adjusting the shims.
2D Alignment
Although flexible coupled pumps are
carefully aligned prior to crating and
shipping, it is almost a certainty that
strains imposed during transit have
altered the alignment. Complete the
following steps after the unit has been
placed on the foundation and leveled.
The standard coupling supplied by MTH
Pumps has an elastomer member between
two internal serrated flanges. They have
smooth outsides of equal diameter. These
surfaces are used for alignment proce-
dures.
To check the PARALLEL alignment: (Refer
to Figure 2-3)
1. Place a straightedge across the two
coupling flanges.
2. Measure the maximum offset (A),
Figure 2-3, at various points around the
periphery of the coupling. DO NOT
rotate the coupling.
3. If the maximum offset exceeds the
Parallel dimension in Chart 1 for your
Figure 2-3
A

sleeve size, loosen the motor or pump
and place thin metal shims under
the motor or pump feet until the
offset is set properly.
4. Torque down the motor or pump.
5. Recheck alignment.
To check the ANGULAR alignment:
(Refer to Figure 2-4)
CHART 1
If the parallel or angular misalignment is
great, this is an indication of baseplate
distortion and must be corrected first, refer
to 2C Leveling.
After all leveling and alignment operations
have been completed, piping can begin.
After the piping has been completed, refer
to 2E1 Piping Alignment. Alignment of the
unit must be checked again to make
certain that no piping strains are causing
distortion. After approximately two weeks
of operation, check the alignment again to
make sure that temperature changes,
piping strain, or foundation variations have
not caused misalignment. If alignment has
been maintained over this period, the
pump and motor can be dowelled to the
baseplate.
2E Piping
2E1 Piping Alignment
It is important that all piping be lined up
and not forced into place. It is recom-
mended that you begin piping at the pump.
If the lines are ended at the pump,
particularly if the last piece is cut a little too
short or long, the pump will be forced to
meet the pipe and strain or distortion will
result.
Page 505
2E2 Piping Support
Never allow the pump to support piping.
Other means such as pipe hangers and
pipe supports should be used to carry
piping to avoid misalignment and distor-
tion. Consideration should be
given to thermally induced expansion and
contraction, particularly in long runs of
straight pipe.
2E3 Piping Size
In general, inlet and outlet pipe sizes
should be equal to or
larger than those of the pump.
This should not, however, be the determin-
ing factor. Many things including
installation and operating costs are
involved in the decision. Careful use of the
pipe and fitting friction loss tables as
shown in the Hydraulic Institute manual
along with the appropriate pump perfor-
mance curve should be the basis for
judgements.
2F Typical Installation (Refer to Figure
2-5)
Figure 2-5 shows a typical pump installa-
tion, note the use of pipe hangers and
support and the position of piping, valves,
and components.
1. Using a micrometer or caliper, mea-
surefromtheoutsideofoneflangeto
the outside of the other at intervals
aroundtheperipheryofthecoupling.
DO NOT rotate the coupling
2. Determine the maximum (B) and
minimum (C) dimensions.
3. If the difference between the
maximum and minimum exceeds
the Angular dimension in Chart 1
for your sleeve size, loosen the
motor or pump and place thin metal
shims under the motor or pump
feet until the angular alignment is
correct.
4. Torque down the motor or pump.
5. Recheck the parallel alignment
above.
Fasten Unit Securely to
Foundationin Level Position
Gate Valve
Check Valve
Eccentric
Reducer
Increaser
Vent Plug
Drain
Pipe Supports
Union
Union and
Spool Piece
Combination
Foot Valve and
Strainer
Area of Foot Valve 1 1/
2 Times Pipe Area
Areaof strainer 3 to 4
Times Pipe Area
Pipe Hangers Suction Reservior
Long Suction Lines to have Continual
Rise From Source. Eliminate High Spots
Elbow 10 to 20 Pipe
Diameters from Pump Suction
Arrangement of Suction
Piping for Head-on Suction
Figure 2-5
Maximum RPM & Allowable
MisalignmentTypes JE, JN, JES
Size Maximum
RPM Parallel Angular
3 9200 .010 .035
4 7600 .010 .043
5 7600 .015 .056
6 6000 .015 .070
Figure 2-4
B
C

Page 506
CLOSE COUPLED PUMPS
FLEXIBLE COUPLED PUMPS
A. Rotation
B. Inlet and Outlet Locatrions
C. Foreign Material
D. Electrical
E. Adjustments
F. Cooling Water
G. Priming
H. Starting
I. Stopping
3A Rotation
The standard direction of rotation of the
pump is right handed, or clockwise when
looking at the motor end of the pump. A
rotation arrow, refer to Figure 3-1, is
located on the pump to indicate the correct
direction of rotation.
Operating the pump in reverse will cause
substantial performance variations and can
damage the pump.
Always confirm correct motor rotation prior
to connection of the coupling. If this is not
possible, or a final rotation check is being
performed:
1. Jog the motor briefly.
2. Observe rotation as the unit comes to a
stop.
3. Rotation should be in the direction of
the arrow.
If the motor operates in the wrong
direction:
1. Interchange any two leads on a
three phase motor.
2. On a single phase motor, change the
leads as indicated on the connection
box cover. Some single phase motors
may not be reversible.
3B Inlet and Outlet Locations (Refer
to Figure 3-1)
The pump inlet is located on the end
farthest from the motor. The discharge or
“outlet” can be on the top, side, or bottom
depending on the model and construction
of the pump. Normal discharge position is
on top.
3C Foreign Material
All regenerative turbine pumps have close
running clearances in order to maintain
efficiency. Take extra precautions to
insure that no foreign material larger than
25 microns or .001 inches is allowed to
pass through the pump. Even particles of
this size can damage the pump if allowed
to continue. Regenerative turbine pumps
are not designed for slurries.
Large particles, weld spatter, and other
material found in new
piping systems will bend the impeller
vanes and can sometimes lock up the
pump. If a new pump does not operate
properly, the first thing to check for is
damage from foreign material.
3D Electrical
It is important to be aware of and follow
the appropriate local and national electrical
codes. Do not make wiring alterations that
can affect motor rotation without reconfirm-
ing correct rotation. Select starter heaters
and wiring for the maximum current the
motor can use at full service factor loads.
Regenerative turbine pumps will typically
use extra power for a period until they run
in. This can take three to four weeks
depending on the duty cycle. During this
period, impellers are finding their hydrauli-
cally balanced position.
3E Adjustments
No adjustments are required or advisable
on new pumps. Because of the close fits
in regenerative turbine pumps, it is not
uncommon for the pump to be difficult to
turn over by hand after they have been
allowed to dry out inside. New pumps
from the factory are tested using rust
inhibitors to preclude this possibility.
Onsite system flushing may remove these
inhibitors and subject the pump to the risk
of lock up, if it is allowed to dry out. In this
case, do the following:
1. Fill the pump with fluid.
2. Loosen the thrubolts exactly one turn.
3. Jog the pump momentarily us-
ing the on/off buttons if so equipped.
4. This should “break” the impeller
loose without damage, unless
foreign material has entered the
pump.
5. If possible, spin the pump (or
operate with minimal or zero
discharge pressure) while the
thrubolts are retightened exactly
one turn.
This will flush residue from the close
fitting impeller surfaces.
Because of the large areas of close
fitting surfaces inside these pumps, it
takes only microscopic residue to
produce resistance to rotation. Once
loosened, this material is quickly
dispersed and the impellers will find
their hydraulic center. If these
procedures have been followed, no
damage will have resulted from
"breaking loose" the impeller.
3F Cooling Water
When the pump is used to pump hot
fluids, consideration should be given
to cooling the seals and/or selecting
materials that will give satisfactory
seal life. The actual temperature at
the seal faces, the most critical area,
will always exceed the surrounding
fluid temperature. If seal flushing
lines have not been installed, heat
can build up in the seal faces to a
degree that may destroy the fluid film
necessary to prevent rapid wear. In
some cases it is necessary to cool the
seal flushing fluid. Refer to the seal
manufacturers charts for guidance or
to selection data in the MTH catalog
anytime fluids can reach or exceed
their boiling point.
3G Priming
Pumps should not be operated
unless they are completely filled with
liquid. Damage to parts of the pump
that depend on liquid for their
lubrication can occur. Impellers can
seize quickly when a pump is run dry.
Without lubrication, seal faces can be
damaged from heat buildup.
Pumps can be easily primed with a
vacuum pump. An ejector or liquid
ring vacuum pump is recommended
for this purpose because they are not
damaged if liquid enters them.
3.T31 SERIES
Operation
Figure 3-1
Outlet
Rotation
Inlet

Page 507
Connect the vacuum line to the discharge
side of the pump, either in the discharge
opening or the drain tap. A foot valve is
not necessary when this kind of device is
used.
When a vacuum pump is not practical, a
foot valve in the suction inlet can be used
to prevent liquid from running out. The
pump and suction line can then be filled
completely from an outside source. A
vent opening will be necessary during
filling to let air escape. A tight foot valve
will keep the pump constantly primed so
that automatic operation is possible. The
valve should be inspected regularly to see
that it does not develop leaks which would
allow the pump to run dry.
Optional self-priming casings are
available for MTH pumps allowing priming
when a vacuum pump or foot valve is not
practical. Refer to specific literature for
details.
There are four components to the self
primer:
1. A check valve - necessary to maintain
a vacuum in the suction line as surging
occurs in the pump.
2. An air eliminator - used on the
discharge side of the pump to separate
air from liquid so the liquid can be used
again as air is carried through the
pump.
3. A recirculating line - carries liquid from
the air eliminator to the suction.
4. A fluid chamber - used on the inlet side
to provide a supply of fluid to speed up
priming.
Small suction lines are desirable to
minimize priming time.
Using the self priming casing, it is
only necessary to:
1. Open the plugs in both the inlet
and discharge chambers.
2. Pour fluid in one until both are full.
3. Tighten both plugs.
4. Turn on the pump.
Priming time depends on lift, volume
of air in the suction line, and the size
of the regenerative turbine pump
used. If priming time is long and the
pump becomes warm, refill the
priming chambers with fresh liquid.
Most turbine pumps will pump
twenty-six to twenty-eight inches of
mercury vacuum with cold water in
the pump, but have very little
capacity and therefore are not
practical at lifts over twenty-two feet.
The best way to prime a pump and
keep it primed is to use a flooded
suction. While this is not always
practical, it does provide a number of
advantages. The likelihood of pump
damage from dry running is eliminat-
ed. Suction lines may be large,
reducing line losses and minimizing
the potential of cavitation damage.
There are no check valves or priming
devices to fail or require mainte-
nance. Whenever possible, design
pumping systems with flooded
suction.
3H Starting
Before starting a pump for the first time,
be sure that all the preceding operations
have been carried out. Proper rotation,
priming, and a free turning pump are most
important.
1. Start the pump with the minimum
possible line restriction.
2. Open discharge valves before pressing
the starter.
3. Start the pump and let the system
clear of air.
4. Listen for foreign material being carried
through the pump.
5. Slowly close necessary valves or
otherwise place the pump into service.
6. Listen for indications of undue load or
other sounds indicating problems.
7. Use a clip-on ammeter to check for a
steady load after approximately fifteen
minutes of operation.
3I Stopping
It is best to stop the pump with the least
discharge head possible both for minimiz-
ing strain on components and to be in low
power mode in anticipation of restarting.
If the pump will be down for more than a
few weeks it is advisable to drain it.
Follow the instructions for long term
storage, Section 1, 1B Storage. After any
prolonged stoppage, turn the pump over
by hand before restarting, to be sure it is
free.

Page 508
T31 SERIES
4.Maintenance
CLOSE COUPLED PUMPS
A. Seals
B. Flushing Lines
C. Cooling Water
D. Lubrication
4A Seals
Mechanical seals are used in MTH Pumps
to eliminate the maintenance that is
normally associated with packing boxes.
This does not, however, mean they can
totally be ignored. Check a new installation
for seal leakage.
Maintenance of seals consists primarily of
periodic observation, looking for the first
signs of failure. An occasional drip that
continues to worsen is an indication that
the seal has failed and must be replaced.
Follow the appropriate disassembly/
assembly instructions. Always shut down a
pump with failed seals as soon as
possible. Leaky seals are usually followed
by bearing failures and then possible pump
damage as rotating parts become mis-
aligned.
4B Flushing Lines
If your pump is equiped with external
flushing lines, refer to Figure 4-3, it is a
good idea to confirm they are open before
each operating season or once a year. To
do this, unscrew the connections to the
seal chamber and install a pipe plug in the
seal chamber tap. Jog the pump to conirm
there is flow from the flushing lines. If there
is any suspicion that they may be clogged,
remove and replace them. Remove the
pipe plugs and reconnect the lines when
testing is complete.
4C Cooling Water
If a heat exchanger is used to supply
cooling water for the seals, check the
system periodically in the same way as 4B.
As an additional system check, measure
the temperature as it leaves the heat
exchanger. This can be done with an
external contact thermometer or by adding
an appropriate fitting and internal
thermometer. Cooling water should be
kept below 200°F. External cooling water
sources should be checked for
temperature and pressure. Line
pressure at the seal chamber fitting
must exceed that in the seal chamber
by at least 5 psi. Refer to the specific
instruction sheets for further cooling
system information.
4D Lubrication
Sealed ball bearings are standard in
all MTH pumps. The maximum
continuous operating temperature for
bearings is 375°F. While it is not
advisable to routinely disassemble
sealed bearings, it is possible to
removes the seals during disassembly
and determine their condition. Use
new bearings for reassembly. While
the pump is in service, listen for
unusual sounds or changes in bearing
noise. A screwdriver held between the
bearing housing and your ear while
the pump is rotated by hand is
sometimes helpful if there is too much
ambient noise when the system is
operating.
Figure 4-1
Seat
"O" Ring Washer Fexible
Diaphragm
Retainer
Drive Ring
Spring
Spring
Holder

Page 509
Figure 4-2 Stadard Seal Consrtuction Figure 4-3 External Seal Flushing
Figure 4-4 Internal Seal Flushing
.625 DIA.
1.047
SEAL
O.D.
1.250
DIA
BORE
.547 W.H.

Page 510
T31 SERIES
5.
Figure 5-1
PUMP ENDS
A. Preliminary
B. Disassembly
C. Inspection of Components
D. Reassembly
E. Testing and Final Adjustments
5A Preliminary
Before attempting any service on the pump
or motor, disconnect the electrical power to
the pump motor. If the pump and motor
are to be removed as a unit, note the
wiring configuration. Use colored or
numbered tape to mark the wire connec-
tions of the motor and power source, for
reconnection. If the pump is being used to
pump hot liquid, let the pump and liquid
cool before starting disassembly.
1. Disconnect the inlet and outlet piping
before unbolting the pump and motor.
If the pipes are corroded, use penetrat-
ing oil on the threads to aid in removal.
2. Unbolt the motor from the base and
remove the unit. All work on the unit
should be performed on an elevated
workbench whenever possible.
5B Disassembly
The following tools and equipment are
needed for disassembly of T31 Series
Pumps:
1. Soft plastic or wooden mallet.
2. Small ball peen hammer.
3. 10mm wrench or socket
4. Snap ring pliers.
5. Penetrating oil.
6. 11/16" wood dowel (Approx. 6" long.)
7. Thin blade screwdriver.
8. Cealube G or similar glycol base
lubricant. (DO NOT use petroleum
products.)
To disassemble the pump:
Refer to Figure 5-2 for reference to the
numbered parts in the procedures below.
1. Remove all liquid from the pump. Air
blown through the pump will remove the
water quickly.
2. Remove the four (4) M6-1 X 80mm
bolts (#19) from the cover (#2).
3. Remove the cover. In some cases light
tapping with a plastic or wooden mallet
on the outside diameter of the cover
may be required to loosen it from the
motor bracket. Care should be taken if
a screwdriver is needed to pry between
the cover and motor bracket. Damage
to the “O” ring (#7) and/or impeller
(#11) can result.
4. Remove the impeller. This is easily
done by setting the motor on end. The
impeller is a slip fit and under normal
conditions, can be removed by hand or
by gently tapping on the end of the
shaft with a mallet. Striking the shaft
too hard could damage the seat,
rotating element, or the motor. After
removing the impeller, the impeller key
(#23) needs to be removed from the
shaft keyway.
5. Remove the snap ring (#4) from the
shaft; note the spring that is held in
place by the snap ring. Remove the
spring from the shaft.
6. To remove the rotating element (#12),
gently slide the motor bracket (#1)
forward on the shaft to move the
rotating element high enough to be
removed by hand. Using tools on the
rotating element may damage the
rotating element or the seat. Take
precautions to keep the rotating
element clean if it is to be reused.
7. Next remove the motor bracket.
8. To remove the seat (#125). Refer to
Figure 5-1. Place the motor bracket
face down on a clean flat surface. Look
into the opening in the center of the
motor bracket, and you will see a
portion of the seat. Insert the 11/16"
dowel and, very gently, tap the seat
until it drops out. Care must be taken
with the seat. It is often a brittle
material and is prone to breakage. It is
recommended that a new replace-
ment seat be installed during
reassembly.
5C Inspection of Components
Thoroughly clean all parts. All compo-
nents should be examined for wear and
corrosion. Replace any parts that show
visible wear. If the pump was not
producing sufficient pressure or capacity,
the clearances between the rings and
impeller probably exceed the maximum
allowable clearance. At minimum the
impeller should be replaced in this case. If
the total side running clearance for an
impeller exceeds .007", it is unlikely that
pump performance will reach that of a
new pump except at lower discharge
pressures.
The “O” rings and other elastomeric
components should be replaced if
they have been deformed or cut.
If seal components must be reused,
carefully inspect for microscopic
cracks and nicks. Scratches that
might be ignored elsewhere can
produce leakage if they are on seal
carbons and seat wearing surfaces.
Cleanliness is imperative when
working with mechanical seals.
Almost unnoticeable particles between
seal faces can be, and often are, the
cause of early seal failures.
Check the impeller; it is designed to
float. It should move easily on the
shaft. As long as it can be moved on
the shaft by hand, it is loose enough.
If the impeller can be rocked or
wobbled, it is too loose and must be
replaced.
Check the shaft for galling, pitting, and
corrosion. If the shaft is corroded
where the seal comes in contact with
the shaft, the motor or bearing
pedestal shaft must be replaced.
Surface corrosion must be removed
so that seals can slide freely during
assembly. The shaft diameter should
be no smaller than .002" below the
nominal fractional seal sizes. Remove
any nicks or burrs which may have
occurred during disassembly.
Reclean parts as necessary.
5D Reassembly
All parts should be visually inspected
and cleaned or replaced as outlined in
5C above.
Service

Page 511
1. The seal seat (#125) must be installed
in the motor bracket (#1) before the
bracket is installed on the motor. To
install the seat:
a. Place the motor bracket face up on a
flat surface.
b. Apply a coating of compatible
lubricant to the elastomer portion of
the seat to aid with installation.
c. Carefully press the seat, smooth
side up, into the seat cavity of the
motor bracket. Thumb
pressure is usually sufficient to
install the seat.
2. Install the motor bracket. This is best
done with the motor standing on end.
Make sure that both the "C"-face of the
motor and the feet of the motor bracket
are clean. Slide the motor bracket over
the shaft onto the motor.
3. Install the rotating element (#12).
Lubricate I.D. of the rotating element .
Place the rotating element on the shaft
with the carbon end towards the seat.
Place the spring over the shaft, with the
backing plate up and compress the
spring to locate the rotating element
against the seat. If this fails to seat the
rotating element gently push the
rotating element down with a thin blade
screwdriver being careful not to
damage the seat or the rotating
element.
4. Compress and hold the seal spring
slightly below the snap ring groove and
install the snap ring (#4). Make sure
the snap ring is locked in the groove.
5. Install the impeller key (#23) into the
shaft keyway.
6. The impeller is a slip fit and should slide
on firmly but easily until it stops against
the impeller wearing surface. Force
should not be required or used to install
the impeller in the correct position. The
impeller hub should be facing out away
from the motor bracket. Refer to Figure
5-2.
7. Next, rotate the impeller by hand, the
impeller should move freely.
8. Place the large “O” ring (#7) into the
outside “O” ring groove in the motor
bracket. Place the two (2) smaller "O"
rings (#8) into the smaller "O" ring
grooves.
9. Place the cover (#2) over the motor
bracket and install the four (4) M6-1 X
80mm bolts (#19). Tighten the bolts
systematically, alternating diagonally
across the cover. DO NOT exceed 7-
11 ft. lbs. of torque or damage to the
motor "C"-face may occur.
5E Testing and Final Adjustment
The pump is now ready for installation.
Final adjustments will be made with the
pump in operation.
1. Connect all piping and fill the pump
with fluid.
2. Reconnect the electrical connec-
tions, referring to the colored or
numbered tape used to mark the
wires.
3. Make sure all valves are opened,
and fluid will flow through the
system.
4. Start the pump and make the final
adjustments to the M6 bolts
holding the cover on. These nuts
and bolts must be torqued to
about 7-11 ft. lbs. to obtain proper
performance.
5. Check for leaks on pump and
piping. Special attention should
be given to the seal area at the
rear opening in the motor bracket.
6. Under pressure, the impeller will
find its “hydraulic” balance.
7. Using an amprobe or similar
device, check for motor overload.
8. While the impeller is seating, it is
common to experience some
variance in readings. After a run-in
period the readings should level
off.
This completes the adjustment and
testing phase. The pump is ready for
service.

Figure 5-2
22
125
1
12
411 23
8
7
2
19
T31 CLOSE COUPLED PUMP
NOITPIRCSED/EMAN.ONTRAP.YTQ
tekcarBrotoM11
revoC21
gnisaC/gniR"O"71
tloBurhT/gniR"O"82
gniRpanS41
rellepmI111
tnemelEgnitatoRlaeS211
taeSyranoitatSlaeS5211
tloBurhT914
gulPepiP221
evirDrellepmI/yeK321
Page 512
3
24A
NOITPIRCSED/EMAN.ONTRAP.YTQ
latsedePgniraeB31
gniniateRgniraeB/gniRpanS41
tfahS711
regnilF121
gnilpuoCyeK321
draobnI/gniraeBllaB421
draobtuO/gniraeBllaBA421
sevlaH/drauGgnilpuoC032
wercspaC334
17
23
P2 BEARING PEDESTAL
33
421
24
Figure 5-3
30
An exploded view of the unit, Figure 5-3 is
provided for referencing the numbers in
the following procedures, i.e. flinger (#21).
5B Disassembly
The following tools and equipment are
needed for disassembly of the P2 unit:
Tools:
1. Soft plastic or wooden
mallet.
BEARING PEDESTALS
A. Preliminary
B. Disassembly
C. Inspection of Components
D. Reassembly
E. Testing and Final Adjustments
5A Preliminary P2
1. Disconnect the inlet and outlet piping
before unbolting the pump. If the pipes
are corroded, use penetrating oil on the
threads to aid in removal.
2. Unbolt the pump from the base
and remove. Disassembly
instructions for the pump are
found in Section 5, T31
PUMP ENDS. All work on the
unit should be performed on an
elevated workbench whenever
possible.
The disassembly and reassembly
procedures are broken into two
sections covering the following units :
5B —Disassembly of the P2 Unit.
5D —Reassembly of the P2 Unit.
T31 SERIES
Service5.

CHART 1
2. Place the pedestal, pump mounting
surface up, in a vise or suitable fixture
and insert the bearing assembly. It
should be possible to install the shaft
assembly with firm thumb pressure.
Refer to Figure 5-8. If more force is
required, the butt end of a hammer
handle or plastic mallet may be helpful.
The shaft assembly should never be
forced or driven in.
3. Install the snap ring (#4) in the
pump end of the pedestal. Be sure the
snap ring is seated properly in the
groove. The beveled edge of the ring
should face away from the bearing.
4. Install the flinger over the snap ring.
The bearing pedestal is now ready for
pump and motor installation.
*Alternate bearing installation proce-
dures.
If an arbor press is not available, the
bearings may be installed on the shaft
using the following procedure:
Page 513
2P
retemaiDedisnI"1
retemaiDedistuO"2
Figure 5-7
Figure 5-8
5. Using a plastic or wooden mal-
let, gently tap on the end of the shaft
until it slides out of the frame. Both
bearings should come out with the shaft.
Do not use a metal hammer, severe
damage to the shaft will occur.
6. Using the arbor press, remove the two
(2) bearings from the shaft. Refer to
Figure 5-5. If the inner race is
well supported during this operation, no
damage will be done to the bearings.
3. Repeat step 2 to remove the other
bearing. Good support used on
the inner races will prevent bearing
damage.
5C Inspection of Components
Thoroughly clean all parts. All
components should be examined for
wear and corrosion. Replace any
parts showing visible wear.
Check to be certain that a press fit still
exists between the shaft and the
bearings. New bearings, or at least
cleaned and regreased bearings, are
recommended.
Check the shaft for galling, pitting,
and corrosion. Surface corrosion on
the pump portion of the shaft must be
removed so the seals will slide freely
during assembly. The shaft diameter
should be no smaller than .002" below
the nominal fractional seal sizes.
Remove any nicks or burrs which may
have occurred during disassembly.
Reclean parts as necessary.
5D Reassembly
All parts should be visually inspected
and cleaned or replaced as outlined in
5C above. It is recommended that
the bearings be replaced anytime the
bearing pedestal is disassembled for
service.
1. Using an arbor press, install the
bearings on the shaft prior to
installing the shaft into the
pedestal. A steel “donut”with the
proper inside diameter and outside
diameter, Refer to Chart 1, should
be used between the arbor face
plate and the lower bearing to
insure proper installation and to
prevent bearing damage. The
bearings must seat against the
shoulder for proper alignment.
Refer to Figure 5-7. *Also refer to
Alternate bearing installation
procedures.
Figure 5-6
2. Place the shaft with either
bearing resting on top of the jaws
and gently tap on the end of the
shaft until the bearing is removed.
Refer to Figure 5-6.
Figure 5-5
If an arbor press is not available, a bench
vise may be substituted using the following
instructions.
1. Remove the pedestal andclose the jaws
to approxi-mately 1-1/8".
2. Arbor press or vise.
3. 3/4" X 6" piece of water pipe.
4. Internal snap ring plier.
5. Penetrating oil.
When installing or removing bearings from
the shaft, the use of an arbor press is
strongly recommended.
To disassemble the pedestal:
Refer to Figure 5-3 for reference to the
numbered parts in the procedures below.
1. Remove the flinger (#21) located in the
pump end of the bearing pedestal (#3).
2. Using a snap ring plier, remove snap
ring (#4).
3. Open the jaws of the vice approximately
2-1/4".
4. Place the pedestal, pump side down, on
the jaws. Refer to Figure 5-4.
Figure 5-4

T31 SERIES
Troubleshooting coupled pumps. Reverse two
leads on a three phase motor to
change rotation. Check motor
nameplate for single phase
operation.
6. Clogged suction line, strainer, or
foot valve —
Inspect and clean out if neces-
sary.
7. Air pocket in suction line —
Look for high spots in inlet piping
system. Evacuate the system with
a vacuum pump if necessary.
6B Reduced Capacity
1. Pump not up to speed —
Use a tachometer to determine
actual RPM. Check voltage and
wiring connections.
2. Excessive suction lift —
Relocate pump, supply tank, or
both to minimize suction lift.
3. Insufficient NPSH —
Relocate pump, supply tank, or
both to improve NPSH available if
possible. Increase suction
pressure. Reduce fluid tempera-
ture. Select a pump with lower
NPSH requirements.
4. Mechanical damage —
Rotate the pump by hand to
determine if there are tight spots.
Broken or bent impeller vanes can
sometimes be noticed in this
manner. If there is suspicion of
damage, remove the pump from
service and disassemble for inspec-
tion.
5. Air leak in the suction line —
Fill the system with fluid and hydrostat-
ically test. Tighten connections or
replace leaky components.
6. Air pockets in the suction piping —
Operating the system at maximum flow
conditions will usually clear the lines.
Evacuate the system with a vacuum
pump if necessary.
7. Suction lines, strainer, or foot valve too
small or clogged —
Inspect and clean out as necessary.
Fittings and lines should be at least
equal to the pump suction size.
8. Discharge head too high —
Install a pressure gauge at the pump
discharge to determine the actual
operating pressure. Compare readings
with pump performance curve. A
larger pump may be necessary.
9. Excessive wear —
If a pump had previously performed
satisfactorily and now gives evidence
of reduced performance, it should be
disassembled and examined for wear
after the simpler possible problems
have been pursued.
Page 514
6.CLOSE COUPLED PUMPS
A. Failure to Pump
B. Reduced Capacity
C. Reduced Pressure
D. Pump Loses Prime After
Starting
E. Excessive Power Consumption
F. Pump Vibrates or is Noisy
G. Mechanical Problems
H. Seal Leakage
6A Failure to Pump
1. Pump not up to speed —
Use tachometer to determine actual
RPM. Check voltage and wiring
connections.
2. Pump not primed —
Confirm that pump and all inlet piping
is filled with fluid.
3. Discharge head too high —
Install a pressure gauge at the pump
discharge to determine the actual
operating pressure. Compare readings
with pump performance curve. A
larger pump may be necessary.
4. Excessive suction lift —
Relocate pump, supply tank, or both to
minimize suction lift.
5. Wrong direction of rotation—
Compare pump rotation with arrow on
pump. Standard pumps rotate in a
counterclockwise direction when
looking at the shaft extension end.
Clockwise from the motor end on close
5E Testing and Final Adjustments
1. Check to be sure that the rotating
assembly turns freely. Turn the
shaft by hand. If it is tight or rough
spots are encountered, it is likely
that at least one of the bearings
was damaged during disassembly/
assembly operations and will have
to be replaced.
This procedure is not recommended and
should only be used in an emergency
situation.
1. Stand a piece of 3/4" pipe, with
the threads cut off, on a workbench or
similar flat surface, with the bearing
placed on the correct shaft end.
2. Insert the shaft into the pipe so the
bearing is between the pipe and the
shoulder of the shaft. Refer to Figure
5-9.
3. Using extreme caution, gently tap on
the end of the shaft until the bearing
rests against the shoulder. Never
attempt to install the bearings by
striking the outer race.
4. Repeat step 3 for the other bearing.
2. Look to make sure that the lip seals on
the bearings are positioned
properly in their grooves. Correct if
necessary. As the bearings are turned,
the grooves should appear wet
with oil but have no visible grease
present.
3. Recheck the snap ring onthe large
bearing end. It should be firmly in
place, and no axial motion should result
from gentle tapping on either end of
the shaft. (Use a soft mallet so shaft
surfaces are not damaged.)
4. No adjustments are possible or
required. Proceed with the appropriate
pump end assembly operations. Refer
to Section 5 SERVICE - PUMP ENDS
(Final testing is done after the pump
end is in place.)
Figure 5-9

6C Reduced Pressure
1. Pump not up to speed —
Use a tachometer to determine
actual RPM. Check voltage and
wiring connections.
2. Air or vapor in liquid —
Install a separator in the suction line.
Hydrostatically test the system to
insure that there are no leaks.
3. Mechanical wear or damage —
Rotate the pump by hand to
determine if there are tight spots.
Broken or bent impeller vanes can
sometimes be noticed in this
manner. If there is suspicion of
damage or wear, remove the pump
from service and disassemble for
inspection. Look for wear on the
impeller, suction cover, and motor
bracket.
4. System head less than expected —
Replace pump with higher capacity
unit or add a valve or orifice to
increase line resistance.
6D Pump Loses Prime After Starting
1. Leak in suction line —
Fill the system with fluid and
hydrostatically test. Tighten connec-
tions or replace leaky components.
2. Air entering pump through
“O”rings —
Hydrostatically test the pump looking
for leaks. Replace faulty “O”rings.
3. Insufficient NPSH or too much
suction lift —
Relocate pump, supply tank, or both
to improve inlet conditions. Increase
suction pressure. Reduce fluid
temperature. Select a pump with
lower NPSH requirements.
6E Excessive Power Consumption
1. Speed too high —
Check RPM with tachometer.
2. Discharge head too high —
Install a pressure gauge at the
discharge to determine the actual
operating pressure. Compare
readings with pump performance
curve. A different pump, motor or
both may be necessary.
3. Specific gravity or viscosity too
high —
Check fluid involved. A different
motor may be necessary.
Page 515
4. Mechanical damage —
Turn pump over by hand. After a few
days run in period, all models should
turn over by hand with no tight spots.
An exception to this is when the pump
has been idle for some time. In this
case, run the pump for a few hours
before checking for tight spots. If there
is suspicion of damage, remove the
pump from service and disassemble for
inspection.
5. Pump not fully broken in —
It is normal for new pumps to consume
higher than normal current during the
break-in period. If high power con-
sumption persists beyond a few weeks,
it is unlikely that further operation will
reduce consumption.
6. Pump not properly adjusted —
Loosen all nuts on pump exactly one
turn. Follow the instructions in Section
5E Testing and Final Adjustments for
repositioning fasteners.
6F Pump Vibrates or Is Noisy
1. Insecure mounting —
Follow instructions in Section 2.
2. Piping load on pump —
Install piping supports and check to
see that there is no strain on the pump.
3. Mechanical damage —
If mechanical damage is suspected,
check first to determine if pump turns
freely. Disassemble for inspection if
tight spots are found.
4. Pump has a high pitchedwhine —
This is typical of a regenerative turbine
pump. The intensity should increase
as pressure increases. Over a period
of a few weeks the noise level will
diminish and will be noticeably quieter
as it approaches a run-in condition.
6G Mechanical Problems
1. Short bearing life —
Bearings damaged due to leaky seals.
Coupling misalignment. Piping load on
pump. RPM or pressure too high.
2. Pump locked up —
Pump dried out and close clearances
rusty. Follow installation instructions
for loosening the pump. Foreign
material in pump. Flush out. Disas-
semble if flushing is not successful.
3. Pump leaks —
Seal or “O”rings are usually the
problem. Disassembly and replace-
ment is the solution if tightening the
through bolts has no effect.
6H Seal Leakage
1. Worn seat or rotating element —
Seals will last many years operating
on cold clear water or other fluids
with reasonable lubricity. Particles,
even microscopic, increase normal
wear rates. Temperatures near the
fluid's boiling point can reduce
lubricity which in turn increases
wear. Some chemicals will erode the
seal faces or plate out on the faces
producing an abrasive effect.
Immediate seal replacement is
recommended when leaks become
evident, since bearings are quickly
ruined as a result of moisture.
Severe mechanical damage results
when the bearings fail.
2. Improperly installed seat or rotating
element —
If a seal has recently been replaced,
look for a missing “O”ring around
the seat, or a seat that is cocked or
in backwards. The smooth surface
should face the rotating element.
The rotating element may be in
backward or improperly positioned.
Refer to the appropriate seal
diagrams and instructions to confirm
the correct seal orientation. Rotating
elements sometimes stick in the
wrong position if left partially
assembled for some time. Make
sure a rotating element can be
moved axially on the shaft before
closing up the pump and then make
the final adjustments as soon as
possible.
3. Seat broken during assembly—
Ceramic seats are particularly
vulnerable to damage.
Carefully follow reassembly instruc-
tions for seals.
4. Pitted shaft under the seal —
Reusing a shaft when repairing a
pump is the probable cause of this
problem. The seal rotating element
can produce a pitted surface
underneath its elastomer portion
during normal use. This is normally
not a problem for the first seal
assembly since the elastomer is
conforming as this action occurs. A
new seal can leak before it conforms
if the pits are large enough. If any
pits are visible to the unaided eye,
shaft replacement is advised.

T31 SERIES
MTH PUMPS
401 West Main Street •Plano, IL 60545-1436
Section T31 Page 516
Dated January 2000
97-4621-01-588
MTH Tool Company, Inc. / MTH Pumps,
hereinafter referred to as “MTH”, warrants
for a period of twelve (12) months from the
date of shipment (“The Warranty Period”),
that the pumps manufactured by it will be
free from defects in material and workman-
ship. MTHwillcorrectdefectsinmaterialor
workmanship which may develop in its
productsunderproperornormaluseduring
the Warranty Period and under the condi-
tions of this Warranty. This Warranty does
not extend to anyone except the original
consumer-purchaser. Damagetotheprod-
uct due to improper handling, improper
storage,improper maintenance, or improp-
er application is not covered by this
Warranty. Warranty claims for motors, me-
chanical seals, and accessories should be
directed to those who manufactured the
component. MTH will repair or replace, at
its option and expense, its products proved
to be defective after examination by the
Company. The defective Product must be
returned,transportationprepaid,tothe
factory at Plano, Illinois. Disassembly
of the equipment impairs determina-
tion of reasons for failure and shall be
cause for voiding this Warranty. The
Product, repaired or replaced, will be
shipped f.o.b. MTH’s factory. This is
MTH's sole warranty. MTH makes
no other warranty of any kind, ex-
pressed or implied, and all implied
warranties of merchantability and
fitness for a particular purpose
which exceed MTH's aforestated
obligations are hereby disclaimed
byMTHand excluded fromthiswar-
ranty. MTH neither assumes nor
authorizesanypersontoassumeforit,
anyotherobligationinconnectionwith
the sale of the Product and any en-
largement of this Warranty by a
purchaser shall be for its own account
and its exclusive responsibility. This
Warranty shall not apply to any Prod-
8.Limited Warranty uct or parts of Products which: (a) have
been repaired or altered outside of MTH’s
factory, in any manner; or (b) have been
subjected to misuse, negligence or acci-
dent; or (c) have been used in a manner
contrary to MTH’s printed instructions; or
(d) have been damaged due to defective
power supply or faulty installation. MTH
shallnot beliable forincidental andcon-
sequential losses and damages under
this express warranty, any applicable
implied warranty, or claims for negli-
gence, except to the extent that this
limitation is found to be unenforceable
under the applicable State law. Some
States do not allow the exclusion or
limitation of incidental or consequential
damages, so the above limitation or ex-
clusion may not apply to you. This
warranty gives you specific legal rights,
and you may also have other rights
which vary from State to State.
A. Parts
B. Repair Service
C. Warranty Service
D. Motors, Mechanical Seals,
and Accessories
7A Parts
Repair parts may be obtained through
your local Authorized MTH Pumps
Representative or Distributor who can be
found in the yellow pages or by contacting
MTH Pumps at 401 W. Main St.
Plano, IL 60545
Phone: [phone]
Fax: [phone].
7B Repair Services
Repair service for an MTH pump should
be obtained from the company through
which it was purchased.
7. In the event this is not possible, the
name and phone number of a nearby
MTH representative or distributor
may be obtained by contacting MTH
Pumps. In the event that it is
necessary to return the pump to the
factory for repairs, remove all
accessories attached to the pump.
We cannot accept responsibility for
their safe removal, storage, and
return.
7C Warranty Service
All requests for warranty claims
should be made through the compa-
ny from which the pump was
purchased or supplied. Complete
details on what is wrong with the
pump must be provided along with
information on the system in which it
is installed. Refer to the MTH Pumps
Limited Warranty statement. Return
authorization must be obtained prior
to returning any equipment.
7D Motors, Mechanical Seals, and
Accessories
Repair or replacement service on motors,
mechanical seals, relief valves, or other
accessories should be obtained from the
manufacturer of these components. MTH
does not carry replacement parts and is
not authorized to render repair service on
these components. Replacement
mechanical seals are stocked at MTH and
are always available insofar as possible
for immediate shipment. Warranty
service, as well as expert application
information can be obtained from your
local seal manufacturer's sales office.
Parts and Repair Services
T31 SERIES