MagnaTex MPL Series User manual

Operation and Maintenance Manual
Magnetic Drive Sealless Pumps
MPL/MHL SERIES
Magnatex Pumps, Inc.
3575 West 12th Street
Houston, TX 77008
Toll Free: 866.MAG.PUMP
Phone:[phone] Fax:[phone]
www.magnatexpumps.com
M
PL/MHL
IOM
-
R
2
Copyright 2020
Magnatex Pumps, Inc.

MPL/MHL IOM-R2 Copyright 2020 Magnatex Pumps, Inc. 2
!WARNING
! MAG
-
DRIVE PUMP
DO NOT WORK ON THIS PUMP IF YOU ARE WEARING A
MEDICAL DEVICE (DEFIBRILLATOR, PACEMAKER, ETC.)
PERSONNEL WHO EXPERIENCE INTERFERENCE WITH
THEIR MEDICAL DEVICE SHOULD MOVE AWAY FROM
THE PUMP AND REFRAIN FROM HANDLING MAGNETIC
PUMP COMPONENTS. SEEK IMMEDIATE MEDICAL
ATTENTION IF YOU HAVE EXPERIENCED
INTERFERENCE WITH YOUR MEDICAL DEVICE.
The rare earth permanent magnets in this pump have been
manufactured such that the magnetic field is directional toward each
half of the magnetic coupling. For this reason, the magnetic field that
exists outside of the assembled magnetic coupling is minimal. When
the two halves are apart, the magnetic field is exposed, which is why
we recommend that personnel wearing medical devices DO NOT
HANDLE the magnetic coupling components. When the pump is
assembled, the magnetic fields from the magnetic coupling
components are not exposed and it is safe for wearers of medical
devices to be in the general proximity of the assembled pump,
whether the pump is in operation or not.

MPL/MHL IOM-R2 Copyright 2020 Magnatex Pumps, Inc. 3
TABLE OF CONTENTS
SECTION HEADING PAGE
Warnings ............................................................................ 2
Operating Instructions ......................................................... 4
Receipt of Equipment ........................................................... 4
Storage Procedures .............................................................. 4
Foundation .......................................................................... 5
Location and Piping .............................................................. 5
Rotation Check and Start-Up ................................................. 6
Priming ............................................................................... 7
Lubrication of Pump Process Bearings .................................... 7
Operations and Maintenance ................................................ 7
Maintenance Schedule ......................................................... 8
Torque Check ....................................................................... 8
Recommended Fastener Torque Values ................................. 9
MPL/MHL Series
Dismantling of MPL/MHL Pump ............................................ 10
Inspection of Used Parts – Replace or Re-use? .......................11
Assembly of MPL/MHL Pump ............................................... 13
MPL Parts List ......................................................................16
MPL Sectional Drawing ........................................................ 17
MHL Parts List .....................................................................18
MHL Sectional Drawing ....................................................... 19
MPL/MHL Exploded View Drawing ........................................ 20
Nozzle Loading Criteria ........................................................ 21
Magnet Torque Table............................................................22

MPL/MHL IOM-R2 Copyright 2020 Magnatex Pumps, Inc. 4
WARNING:
WHEN WORKING ON MAGNETICALLY DRIVEN PUMPS
Strong magnetic fields may damage watches, credit cards, computers,
computer tablets, cell phones and other electronic equipment when
these are exposed to the magnetic fields of the exposed magnetic
coupling components.
People with pacemakers should be cautioned that the strong magnetic
field may upset the timing or cause the pacemaker to malfunction.
When working on the pumps, be aware that tools or metal parts
brought within close proximity to the magnets may suddenly be
attracted trapping fingers in the process.
OPERATING INSTRUCTIONS
MPL/MHL ANSI DIMENSION PUMPS
This instruction manual is intended to assist those responsible for the installation,
operation and maintenance of MAGNATEX Magnetic Drive Sealless Pumps. The MPL
Pump Series is rated up to 300°F and the MHL Pump Series is rated to 536°F, both at
150 psi. We recommend thoroughly reading this manual and reviewing the Hydraulic
Institute Standards regarding Horizontal Centrifugal Pump installation before installing
and operating your pump.
RECEIPT OF EQUIPMENT
A. Prior to uncrating, check for physical damage to the pumping system and notify the
common carrier IMMEDIATELY if any damage is found.
B. Check the nameplate on the pump against receiving and purchase order documents to
be sure that the correct size pump and materials of construction have been supplied. If
a motor has been supplied, check for correct horsepower, speed, and voltage.
C. Check to see if flange protectors are intact. If not, check for foreign objects which may
have found their way into the pump casing through the flange openings.
D. Check for free rotation of the pump. Remove the motor fan guard and rotate the pump
using the motor fan. Only slight resistance should be felt. If the pump has heavy
resistance, or if any crunching or grinding noise is heard, call your MAGNATEX
representative or MAGNATEX PUMPS INC. (713-972-8666).

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STORAGE PROCEDURES
As shipped, the pumps are suitable for short term storage only, ~3-6 months, and the pump
unit should be stored indoors in a protected environment away from weather extremes. If long
term storage is necessary before the pump will be put into operation, contact your local
representative or MAGNATEX PUMPS, INC. for long term storage recommendations.
For maximum protection cover the pump with plastic or some other protective material.
Motors should be greased (only if grease fittings are provided) and rotated by hand every
three (3) months. Maintain pump nozzle flange covers in place until ready to install the pump.
Before start-up, refer to the section titled "Rotation Check and Start-Up" (page 6).
PUMP AND MOTOR ALIGNMENT
MPL/MHL pumps are close-coupled pumps with the motor fitted to the pump frame adapter
with a machined register fit that eliminates the need for external pump and motor alignment.
FOUNDATION
The foundation should be firm and heavy to reduce vibration and prevent flexing which can
result in misalignment. A concrete foundation with a solid baseplate is recommended.
Foundation bolts of the correct size should be located by reference to certified drawings. A
baseplate is not necessary, but is available as an option in steel, stainless steel and non-
metallic quartz-polymer materials. Anchor bolts for non-metallic baseplates should be torqued
to only 15-20 ft-lbs.
LOCATION & PIPING
A. Locate the pump as close as practical to the source of liquid supply.
B. The suction line should be as short and straight as possible and contain a minimum
number of elbows. Any elbows should be the large radius type. Elbows and fittings
should be no closer than 10-20 pipe diameters to the pump suction to allow
undisturbed flow to the pump impeller. The higher the velocity the greater the distance
of straight pipe is needed.
C. Generally, suction piping should be one or two sizes larger than the pump suction to
keep friction loses to a minimum. This becomes more important as the distance
between the pump and the liquid supply increases, or similarly, if the piping
fittings/connections are located closer than 10-20 pipe diameters to the pump's suction;
see B above.
D. The suction piping should have no high spots where air pockets can collect. All joints in
the suction line should be tight to prevent air from entering into the system and
creating the possibility of vapor locking. This is especially important when suction
pressure is lower than the atmospheric pressure. A compound pressure gauge should
be installed in the suction line at two pipe diameters from the suction flange.
E. An air vent should be installed at the initial high point in the pump discharge line. A
check valve and shut-off valve should be installed as close as possible to the pump
discharge nozzle. The check valve is installed to protect the pump from excessive
back pressure, including reverse flow / rotation, and back flow during shut down or
driver failure. The discharge valve is located at the pump discharge to regulate flow
and isolate the pump for servicing. A pressure gauge should also be installed on the

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discharge side of the pump as close as possible to the discharge nozzle between the
pump and discharge valve.
F. Prior to starting the pump, it is important to flush the piping to insure the system is
free of foreign matter and particles such as pipe scale, welding beads and dirt from
system fabrication. Large particles can block the bearing lubrication ports in the
pump causing serious damage. In addition, metallic particles can magnetically attach
to the inner magnet also resulting in damage. If possible, a temporary startup
strainer with a 40x40 US mesh screen should be installed in the pump’s suction line.
BE VERY CAREFUL not to allow the temporary strainer to be plugged to the point of
starving the pump of liquid, resulting in cavitation and the possibility of running the
pump dry. Since running the pump dry can destroy the pump’s bearings, it is
recommended to install a compound pressure gauge between the strainer and pump
suction to monitor partial plugging of the strainer. The discharge pressure should
also be closely monitored. Any drop in discharge pressure without discharge valve
throttling could indicate partial strainer plugging (assuming constant demand to the
system).
G. Magnatex pumps, although very rugged, are not designed to handle excessive pipe
stress. The resulting forces and moments on the pump can result in misalignment
and possible damage to the pump. Piping must be anchored as close to, but
independent from the pump. Pump and pipe flanges must be positioned together
with gaskets (supplied by others) before attempting to tighten flange bolts. See
Nozzle Loading Criteria, drawing ED-4160 on Page 14.
H. The pump MUST NOT RUN DRY. To assure that adequate liquid is available to the
pump suction, a flow sensor and /or power monitor should be installed to shut the
pump down in the event of dry run. MAGNATEX provides an optional electronic
power monitor offered at time of pump quotation to prevent dry run operation when
properly installed and set according to the normal operating parameters of the pump.
ROTATION CHECK, AND START-UP
Removal of air from the pump system is critical for proper system and component
performance. Trapped air/vapor voids in the system piping can cause reduced discharge
pressure readings and “choked” system flow. Safely vent all air/vapor from the system
following best operational procedures.
Before the pump is placed in service check the direction of motor shaft rotation as noted
below. Rotation should match the cast-in arrow or label and the direction of the casing scroll
terminating under the discharge flange.
ROTATION
A. Open the suction and discharge valves and allow the pump to be filled with liquid.
Vent piping at system vent points.
!WARNING! NEVER RUN THE PUMP DRY
B. Remove the motor fan guard for visual inspection of motor shaft rotation.

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C. Bump the motor by quickly pushing the motor start/stop buttons. Rotation should be
clockwise as seen from motor end. If the direction of rotation is incorrect, reverse
two of the three-phase power leads to the motor at the motor conduit box.
D. After confirming proper rotation open the motor electrical disconnect and install the
motor fan guard.
PRIMING
A. Open the suction and discharge valves and allow the pump to fill with liquid. If the
direction of rotation has not been checked, this must be done as detailed above
under Rotation Check and Start-up before proceeding.
!WARNING! NEVER RUN THE PUMP DRY
B. Close the discharge valve to 1/4 open.
C. Start the motor and immediately check the discharge pressure gauge. The pressure
should rise quickly and hold steady. If the pressure rises and then falls back, there is
air or vapor in the system. STOP THE PUMP IMMEDIATELY. Wait 15 to 20 seconds
before restarting the pump.
D. If after repeating Step C several times, the pressure gauge does not hold steady or
does not yield the expected pressure (from performance curve), contact your
Magnatex representative, or MAGNATEX PUMPS INC. (713-972-8666) for
assistance. Do not continue to operate the pump under these conditions.
E. Once the pump is fully primed and the discharge pressure is steady, slowly open the
discharge valve until the desired operating point is reached as referenced by
discharge pressure reading and /or flow meter indication. The flow and head should
match the design performance curve for the pump as ordered.
LUBRICATION OF PUMP PROCESS BEARINGS
MPL/MHL pumps have Silicon Carbide (SiC) hydrodynamic bearings on the process side of the
pump that are internally lubricated by the pumped liquid. The pump must have liquid in it
during operation to avoid damage and breakage of these product lubricated bearings. An
optional material of SiC-X is available for enhanced resistance to lubrication and system upset
conditions. Contact your Magnatex representative or MAGNATEX PUMPS INC. (713-972-
8666) for more information.
OPERATIONS AND MAINTENANCE
A. Operators should make frequent visual inspections to insure the pump is running
smoothly without noise or vibration, and that the discharge pressure is holding
steady without fluctuation. Any excessive heating of the pump or motor bearings is
cause for alarm. The unit should be shut down immediately, an investigation made
to determine the cause, and corrective action taken.
B. Follow the motor manufacturer's recommendations and keep the motor bearings
lubricated properly.

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WARNING!Never throttle the pump by closing the valve on
the suction side of the pump. Throttling the suction side can
cause serious damage to the pump. Throttle only from the
discharge valve.
WARNING! Never operate the pump against a closed
discharge valve for more than a few seconds. Low flow
operation can cause rapid heating of the pumped liquid with
possible vaporization and the pump bearings running dry,
resulting in serious damage to the pump.
MAINTENANCE SCHEDULE
Part to be Inspected Inspection Value Frequency
Inner Magnet Dismantle and check Thrust Rings, Every 2 to 3 Years
Sub-Assembly Sleeves, and Silicon Carbide
Bushings for wear. Use new gaskets
upon reassembly.
Motor As directed in the motor operations As directed in
manual motor manual
TORQUE CHECK
Since the MPL/MHL pumps are close-coupled to the motor, it is necessary to remove the
motor fan guard to allow access to the motor shaft where the fan is installed. Also, the
pump and motor unit must be removed from the system to allow access to the impeller
nut through the pump suction nozzle. To determine the static breakaway torque of the
magnet coupling, a torque wrench is used on the impeller nut while holding the exposed
end of the motor shaft with a wrench or other suitable tool. Proceed as follows:
A. Remove the motor fan guard and remove the motor fan.
B. Select the appropriate socket size for the pump impeller nut for use with the torque
wrench. The torque wrench should be compliant with a regular calibration
schedule.
C. Check that the pump and motor unit is
securely anchored to prevent movement
of the unit during the torque tests.
D. Grip the motor shaft with a wrench, strap
wrench, or appropriate tool to hold
against rotation of the motor shaft. DO
NOT DAMAGE the motor shaft while using
the tool to hold the motor shaft
stationary!
E. Set the torque wrench using an initial
torque setting below the minimum torque

MPL/MHL IOM-R2 Copyright 2020 Magnatex Pumps, Inc. 9
(~20% below the value listed for the respective magnet size) in the table on Page
22. Placing the torque wrench socket on the pump impeller nut, slowly turn the
torque wrench in the clockwise direction (CCW as seen from motor end – tightening
direction for the impeller nut) until the torque setting is reached or the magnets
turn over (decouple).
F. If the magnets do not decouple at the initial torque wrench setting, increase the
torque wrench setting and repeat step D (~10% below the magnet torque value) in
successive trials until the minimum torque value is reached or the magnets
decouple. If the magnets decouple before the minimum value is reached, the inner
magnet and possibly the outer magnet must be replaced.
G. If the magnets do not decouple before reaching the minimum valve, the actual
decoupling value can be determined by successive tests above the minimum value
until the magnets do decouple (turn over).
GENERAL NOTES
A. All inner magnets are marked "FRONT" to assist in correct position for reassembly.
This marked end of the magnet must face the impeller of the pump.
B. Do not mix inner and outer magnet sizes. Inner magnet size should correspond
with outer magnet size, such as V40N inner and outer magnets or V65N inner and outer
magnets, NOT V40N inner and V65N outer magnets. Do not high temperature magnets
with low temperature magnets.
C. All casing covers and rear casings are marked "UP" on outer flange surface and
utilize a rocker pin to assist in proper positioning.
D. When accomplishing maintenance tasks and during reassembly, all threaded
fasteners must be torqued in accordance with the torque table below.
RECOMMENDED TORQUE VALUES FOR INTERNAL BOLTS AND SCREWS
ALL MPL/MHL SERIES ANSI DIMENSIONED PUMPS
MPL/MHL
MODEL
(ALL
MAGNET
SIZES)
6
Impeller
Nut
(ft. lbs.)
11
Impeller
Nut Set
Screw
(in. lbs.)
7
Sleeve
Bolt
(ft. lbs.)
12
Sleeve
Bolt Set
Screw
(in. lbs.)
8
Hex
Socket
Head
Bolt
(in. lbs.)
66
Casing
Hex
Head
Bolt
(ft. lbs.)
67
Hex
Head
Bolt
(ft. lbs.)
76
Outer
Magnet
Set
Screw
(ft. lbs.)
40
42LF
42
72 42 33 42 106 31 31 106
84
84-8
85
52LF

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MPL/MHL DISMANTLING
DISMANTLING THE PUMP
1. Remove the pump from the system for dismantling in the shop on a sturdy
workbench. Secure the pump to the bench top with clamps or bolting.
2. Remove the (8) hex head casing bolts (Items 66) and
pull the casing (Item 1) from the pump assembly.
Inspect the casing interior for signs of wear or
corrosive action from the pumped liquid. Replace the
casing if the wear is greater than 0.065” in more than
20% of the casing interior surfaces. Remove the
casing gasket (Item 33) and discard it. A new gasket
should be used at re-assembly of the pump.
3. Working from the motor side of the pump, remove the
(4) hex head capscrews securing the motor to the
pump frame adapter (Item 50).
4. Support the motor with a crane or blocks underneath the motor body to facilitate
pulling motor out on a straight line corresponding to the motor shaft centerline.
Using a pry bar or flat blade screwdriver, work the
motor loose from the machined fit between the motor
C-face and the pump frame adapter at the small gap
between the two pieces. It may be necessary to use
a rubber or dead-blow mallet to loosen the motor fit.
5. Once the motor fit is loose allowing the motor to be
removed, firmly grasp the motor and disengage the
magnet coupling by pulling the motor out and in a
straight line along the motor shaft axis, removing the
motor with the outer magnet (Item 48) on the motor
shaft.
WARNING
BE CAREFUL TO AVOID TRAPPING YOUR
FINGERS BETWEEN THE MOTOR C-FACE FIT
AND THE FRAME ADAPTER. PULL THE MOTOR
OUT IN ONE MOTION UNTIL FREE OF THE
FRAME ADAPTER AND THE MAGNETIC
ATTRACTION OF THE MAGNET COUPLING.

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6. If the motor is to be replaced, the outer magnet must be removed from the motor
shaft. Loosen the (2) outer magnet set screws (Item 76) and pull the outer magnet
from the motor shaft. Place the outer magnet in a plastic bag to protect it from
attracting metallic particles that would cling to the magnet segments while the pump
is dismantled. The plastic bag must be removed prior to re-assembly of the pump.
7. Working from the pump side of the frame adapter,
remove the (4) hex head capscrews (Item 67) in
preparation for removing the PB Assembly. Grasp the
flange of the rear casing (Item 4) and pull it free from
the pump frame adapter.
8. With the PB Assembly resting on the flange flat edge and
the back of the rear casing can locate and remove the
impeller set screw (Item 11). Using a small cordless
impact drill tool, remove the impeller nut (Item 6) from
the pump shaft (Item 16). DO NOT use the impact tool
during re-assembly to avoid breaking the Silicon Carbide
(SiC) components.
9. Lift the impeller (Item 2) off of the shaft and remove the impeller key (Item 15)
from the shaft.
10. Remove the (4) hex socket head bolts
(Item 8) that retain the casing cover (Item 3) to the rear
casing. With care to prevent the SiC front bushing (Item
42) from falling out as the casing cover is removed, lift
the casing cover off the shaft.
11. Remove the SiC front bushing from the
casing cover retaining bore. Inspect the set screw (Item
13) for damage or looseness and replace if damaged and
tighten if loose.
12. Remove the SiC shaft sleeve (Item 43) and
thrust ring (Item 44) from the shaft. Grasp the end of
the shaft and pull it out of the rear casing, being
careful to prevent the SiC rear bushing (Item 42) from
falling, if it comes out with the shaft.
13.Working with the shaft, remove the sleeve bolt set
screw (Item 12). Unscrew the sleeve bolt (Item 7)
using a hand wrench while holding the inner magnet
and the wrench end on the sleeve bolt with both
hands. (DO NOT place the inner magnet in a vise to
prevent damage to the magnet cladding.) Strike the
free end of the wrench on the table top to loosen the
right-hand threaded sleeve bolt. Once loosened, remove the sleeve bolt by hand,
and remove the SiC rear shaft sleeve and thrust ring.
14.Remove the shaft from the inner magnet (Item 40).

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15.Working with the rear casing, inspect the set screw (Item 13) in the bushing bore at
the bottom for damage or looseness, and replace if damaged, and tighten if loose.
16.This completes the dismantling of the pump.
INSPECTION OF USED PARTS – REPLACE OR RE-USE?
Inspect all parts for wear. The following are not rigid rules, but guidelines which should be
used with all the service conditions in consideration, including safety concerns, i.e. what are
the consequences of placing a used part back in service should it fail? In general, Magnatex
recommends returning a pump to like new condition when re-building a pump or when
pressure components show signs of wear. Use your best judgement with safety in mind.
1. Chatter marks on the SiC components are allowed if the surfaces are still smooth.
Cracks or chips in the SiC components are not allowed. Used SiC components may
be re-used if a dye-penetrant NDE test reveals no “hairline” cracks.
2. Remove any burrs from metal components, particularly in any bore fit to allow easy
assembly. All of the pump components are “slip-fit” construction and pieces should
not be forced together.
3. When inspecting the rear casing the mechanic should look for:
a. Signs of mechanical wear such as scratches, gouges (from broken SiC), or
swirl (scalloped) marks at the bottom of the rear casing in the largest
diameter, which indicates solids are in the pumped liquid. If the SiC bearing
fits can be cleaned up to allow smooth insertion of the SiC bushing and the
casing walls are not breached (damage less than 15% of wall thickness and
less than 25% of the combined surface area) the rear casing may be placed
back in service after a hydrostatic test of 150% of MAWP. Otherwise,
Replace.
b. The original machine marks are typically visible and can be felt by dragging a
small piece of hard plastic along the ID of the can portion. If you know the
part is clean of chemicals, etc. a fingernail works well for this. If the surface
is smooth indicating chemical action on the can portion the thickness should
be measured and recorded for monitoring on subsequent inspections. A
reduction of 10% of the wall thickness indicates time for replacement. A
reduction of 5% in a year indicates close monitoring is required and a change
in materials of construction should be considered.
c. Dents. Not allowed. Replace.
d. Swollen or bulging side walls of the can portion. Not Allowed. Replace.
4. The motor should be checked electrically by qualified personnel or motor shop to
determine the condition of the motor prior to placing it back in service.

MPL/MHL IOM-R2 Copyright 2020 Magnatex Pumps, Inc. 13
MPL/MHL ASSEMBLY
ASSEMBLY OF WETTED END
1. Place the inner magnet key (Item 16) with material stamp facing up onto the inner
magnet shaft (Item 5) keyway. Slide the inner magnet (Item 40) onto the shaft from
the sleeve bolt end (opposite impeller end). The embossed numbers on the magnet
end should face the motor (rear) side of the pump.
2. Slide a thrust ring (Item 44) over the inner magnet shaft from the sleeve bolt end. The
hole in the thrust ring should face the inner magnet and the notch should engage the
exposed, rounded portion of the inner magnet key.
3. Slide a sleeve (Item 43) over the inner magnet shaft and engage the remaining portion
of the inner magnet key with the notch on the sleeve end.
4. Thread the sleeve bolt (Item 7) into the inner magnet shaft. Tighten and secure with
the sleeve bolt set screw (Item 12).
5. Working with the rear casing (Item 4), thread a set bolt (Item 13) into the rear bearing
holder at the bottom of the rear casing can. Carefully slide a bushing (Item 42) into
the rear bearing holder and engage the set bolt with the notch on the bottom of the
bushing. Be sure the bushing notch has engaged the set bolt and is bottomed, and
the bushing can rotate slightly to be stopped by the set bolt.
6. Thread a set bolt (Item 13) into the shaft flange from the
impeller end and tighten. Lift the inner magnet assembly by
the shaft and slowly slide it into the rear casing. Be careful
of the tight tolerances between the rear bushing and sleeve.
This should only be done when the outer magnet is
removed.
7. Slide a thrust ring onto the shaft so the hole engages the set
bolt. Slide a sleeve onto the shaft so the notch is opposite
the thrust ring.
8. Place the rear casing on its side for horizontal installation of the casing cover. Align the
keyed portion of the inner magnet shaft with the notch in the sleeve. Insert the
impeller key (Item 15) onto the shaft and engage the sleeve
notch with the rounded end of the key.
9. Insert a set bolt (Item 13) into the front bearing
holder on the casing cover (Item 3). Slide the other bushing
into the bearing holder and engage the set bolt with the
notch on the bushing end.
10.Align the two flush holes vertically on the casing cover
so the pin located on the VERTICAL POSITION of the rear
casing flange engages the hole in the casing cover. Hold the
loose bushing in place while sliding the casing cover over the

MPL/MHL IOM-R2 Copyright 2020 Magnatex Pumps, Inc. 14
shaft being careful of the tight tolerances between the bushing and sleeve. The
stamped word ‘UP’ should be at the top, 12 o’clock position.
11.Bolt the casing cover to the rear casing using the (4) hex socket head bolts (Item 8).
Tighten the bolts evenly to avoid binding, and torque in accordance with the torque
table on page 9. Check for free rotation of the assembly
12.Place impeller key (Item 15) into the shaft keyway with
material stamp facing up and slide the impeller (Item 2)
onto the shaft. Thread on the impeller nut (Item 6).
Tighten and torque the impeller nut and then secure the
impeller nut with the set screw (Item 11). [This completes
the rotating assembly, also called the PB assembly.]
13.Mount the rotating assembly to the frame adapter (Item 50)
using the four hex head bolts (Item 67). Evenly tighten the
bolts and torque in accordance with the torque table on
page 9.
14.Mount the outer magnet (Item 48) on the motor shaft.
Tighten the outer magnet set screw (Item 76) and torque in accordance with the
torque table on page 9. Ensure that no foreign metallic objects come in contact with
the outer magnet that could be attracted to the magnets. Remove any metal shavings
or grinding particles that have become attracted to the magnets using the adhesive
side of tape or similar material.
15.For MHL pumps be sure the (3) heat insulation sheets (Item 101) are in place between
the motor C-face flange and the frame adapter for this step. Install the motor to the
frame adapter using caution as strong magnetic forces will
pull the magnets together. Carefully position the outer
magnet to fit over the rear casing without touching the
sides of the rear casing can or the magnet segments of
the outer magnet and move the motor to the frame
adapter to engage the magnet coupling. Ensure the motor
flange pilot spigot engages the machined recess on the
frame adapter and is square to the frame adapter flange
face. A small AND EVEN motor flange gap is normal.
Tighten the motor mounting bolts to 55 ft-lbs.
16.Working at the process end of the pump now, place the
new gasket (Item 80) into the pump casing (Item 2) and
locate the pump casing to the rotating assembly making sure the casing gasket did not
WARNING
BE CAREFUL TO AVOID TRAPPING
YOUR FINGERS BETWEEN THE MOTOR
C-FACE FIT AND THE FRAME ADAPTER.

MPL/MHL IOM-R2 Copyright 2020 Magnatex Pumps, Inc. 15
slip out of place to prevent pinching the gasket. Bolt the
casing in place with the (8) hex head casing bolts (Items
66). Tighten the bolts evenly to avoid binding, torqueing
the bolts per the torque table on page 9.
17.Make a final inspection by turning the pump shaft by
hand, checking for free rotation and listening for noise.
Dry silicon carbide components may make a chattering
sound when the rotor is turned by hand. This is normal.
If resistance or scraping is felt, or if crunching noises are
heard (scraping, etc.), inspect the pump to determine the
cause, and take corrective action. A faint clicking noise as the bushing bears against
the anti-rotation set bolts is normal. The click will be heard only once each time the
direction of rotation is changed.
18.Review the assembly procedure and make sure all steps were accomplished. The
pump is ready to be returned to service or placed in stores inventory.

MPL/MHL IOM-R2 Copyright 2020 Magnatex Pumps, Inc. 16
MPL PARTS LIST
TABLE ABOVE INDICATES STANDARD MATERIALS OF CONSTRUCTION. ADDITIONAL MATERIALS ARE
AVAILABLE AS OPTIONS. Contact your Magnatex representative or MAGNATEX PUMPS INC. (713-972-8666)
for more information.

MPL/MHL IOM-R2 Copyright 2020 Magnatex Pumps, Inc. 17
MPL SECTIONAL

MPL/MHL IOM-R2 Copyright 2020 Magnatex Pumps, Inc. 18
MHL PARTS LIST
TABLE ABOVE INDICATES STANDARD MATERIALS OF CONSTRUCTION. ADDITIONAL MATERIALS ARE
AVAILABLE AS OPTIONS. Contact your Magnatex representative or MAGNATEX PUMPS INC. (713-972-8666)
for more information.

MPL/MHL IOM-R2 Copyright 2020 Magnatex Pumps, Inc. 19
MHL SECTIONAL

MPL/MHL IOM-R2 Copyright 2020 Magnatex Pumps, Inc. 20
MPL/MHL EXPLODED VIEW
#101 HEAT INSULATION SHEET NOT SHOWN