Assoma AM Series User manual

SERIES
MAGNETICALLY DRIVEN CHEMICAL PUMP
USER MANUAL

Symbols used
Situation where improper handling or operation failure to follow this manual
would almost certainly result in death or serious bodily injury.
Situation where improper handling or operation or failure to follow this manual
could result in serious bodily injury or death.
Situation where improper handling or operation or failure to follow this manual
could result in bodily injury and/or equipment damage.
When pump is installed in an environment with a potentially explosive
atmosphere, strict adherence to our instructions must be followed (shown in this
manual with the Ex symbol). Situation where improper handling or operation or
failure to follow instructions in this manual would almost certainly result in
serious bodily injury or death.

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Table of Contents
1.Foreword......................................................................... 2
2.Safety Requirements ....................................................... 2
3.Inspecting the Pump Prior to Installation........................ 3
4.Installation, Piping and Wiring ....................................... 4
5.Notes for Operation....................................................... 11
6.Operating Procedure and Notes .................................... 12
7.Maintenance and Inspection.......................................... 13
8.Incorrect Usage and Selection....................................... 15
9.Repair and Warranty...................................................... 17
Annex A: Exploded View and Parts List.......................... 18
Annex B: Description of ATEX-specific marking ...........19

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1. Foreword
Thank you for purchasing an ASSOMApump. To ensure proper operation and
maximum efficiency, please read this instruction manual carefully. Failure to follow the
recommended operating instructions outlined in this manual may result in serious personal
injuries and/or equipment damage.
2. Safety Requirements
This section lists general information about safety. The relevant safety requirements of
installation, wiring, operation and maintenance will set out in the relevant sections.
ASSOMA INC. may not be held responsible for personal loss or property damage resulting
from failure to follow the safety instructions contained herein.
1. A CE certified motor should be used.
2. The explosion-proof grade of AM series pump is dependent on the material
selected and motor used. Please consult our order specification sheet or
contact one of our local representatives to select the best product for your
needs. Refer to Annex B. for a description of the ATEX markings.
3. Be sure to turn off the power before connecting, disconnecting or making any
changes to the pump’s wiring.
4. The customer shall not modify the pump under any circumstances. Doing so
could result in an unexpected accident. ASSOMA INC. shall not be
responsible for accidents or damage resulting from equipment modified by the
customer.
5. Be sure to take special precautions when performing operations if using
hazardous, explosive or inflammable liquids.
6. Strong magnetic field warning: The AM pump uses strong permanent magnets
which may affect certain medical devices (such as pacemakers). Personnel with such
devices are advised to consult their physician and device manufacturer to determine a
safe distance from the pump.
1. The pump operator and pump operation supervisor must not allow any
operator who has little or no knowledge of the pump to run the pump. Pump
operators must have a sound knowledge of the pump and its operation.
2. Do not use a damaged pump. Doing so could result in injury or fire.
3. Keep the pump away from heat source or direct flame. Do not place any open
flame or flammable object near the pump.
1. Transport, installation, piping and wiring connections, operation, adjustment,
maintenance and inspection should be carried out by qualified personnel.
Having unqualified personnel perform these tasks could result in electric
shock, injury or fire.
2. Do not block name plate or warning labels from view.
3. Do not stand on the pump or place heavy objects on the pump under any
circumstances. Failure to comply may result in equipment damage and/or
serious injury.
4. Disposal of used or damaged pump must be done in accordance with local
laws and regulations.

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3. Inspecting the Pump Prior to Installation
(1) Check the pump exterior for any physical damage that may have been incurred during
shipping.
(2) Use a small screwdriver to rotate the impeller of the motor’s cooling fan. The fan
should turn easily. If the fan feels tight or if there are unusual sounds, the interior of the
pump may have been damaged during shipping.
(3) If there is any damage to the pump, please contact the seller immediately to arrange for
replacement parts, and to allow for timely communication with the logistics company
to determine liability.
(4) Each pump has a name plate, indicating the pump model, MFG number, rated head,
flow rate, and motor power, voltage and frequency. Check these data to ensure they
comply with your order and application.
(5) Although some motors are marked usable for both 50 Hz and 60 Hz, the impeller size
of the pump should be trimmed according to frequency applied. Application under
incorrect frequency may cause motor overload (use under higher frequency) or pump
under-performance (use under lower frequency).
(6) Name plate information (including motor name plate and pump name plate) plays an
important role for the operation and maintenance of the pump. It is proposed to re-copy
data on nameplates and store it securely.
(7) The flow and head on the nameplate is the rated operating point or the operating point
based on customer demand. Where "Head" means "Total head”
Total Head= Static Head + Dynamic Head
2gV-V
HheadTotal 2
1
2
2
S
The pump is designed and manufactured to the specifications agreed upon by the
user and ASSOMA INC., such as fluid composition, fluid temperature, working
pressure, environmental conditions and necessary operational information. Use the
pump strictly in accordance with the pump specifications and application range. If
the user intends to change the operation condition, please contact ASSOMA INC.
or the authorized dealer in the near region to obtain the permission in writing
before operation.
Unpack a pump for inspection without proper hoisting, support or lifting
equipment may cause serious personal injury or damage to the pump.

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4. Installation, Piping and Wiring
4.1 Installation Location
(1) The pump should be close to the ground and located near the inlet tank.
(2) There should be sufficient space reserved around the pump to facilitate future
maintenance and repairs.
(3) The pump and its wiring should be placed in a relatively dry environment, protected
from possible flooding.
(4) Install in a location where the ambient temperature will not rise above 40 °C.
(5) Secure the pump to a level base plate or to equipment with anchor bolts.
(6) May not be used at altitudes above 1000 m.
1. Be sure to use the hanger bolt (where applicable) to lift the pump. Lifting from
other parts of the pump may damage the pump. When hoisting, do not pass
under a raised pump. A serious injury could occur if the pump is accidentally
dropped.
2. Before lifting, check the weight of the pump. Do not lift a pump which
exceeds the rated weight of the hoist. And, be sure no one is standing below
the pump while lifting or transporting.
Special care should be taken when installing or storing the pump in the following
places. Please consult with ASSOMA INC. or authorized dealer in the near region:
1. Places where flammable gas, dust or material is used or placed.
2. Places where corrosive gas is generated.
3. Places where the ambient temperature is higher than 40 °C or lower than 0 °C.
4.2 Piping
(1) AM-30/50 flange screw is either
M10 or 3/8”. The tightening torque
is 5 N-m.
(2) The allowable load of pipe on the
pump is as follows:
XY
Z
Z
Y
X
Model SUCTION Force (N) Moment (N-m)
Fx Fy Fz ΣF Mx My Mz ΣM
AM-10 60 50 50 90 10 15 10 30
AM-30 100 80 80 140 25 40 25 60
AM-50 120 100 100 160 25 40 25 60

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Model DISCHARGE Force (N) Moment (N-m)
Fx Fy Fz ΣF Mx My Mz ΣM
AM-10 50 60 50 90 10 15 10 30
AM-30 100 120 100 160 25 40 25 60
AM-50 100 120 100 160 25 40 25 60
Note: The values in table are applicable for within 40 oC
4.3 Notes for Installing the Piping System
14 12
10 119
4
3
13
1
2
5
7
8
6
15
1.Outlet Piping
2.Throttle Valve
3.Priming Piping
4.Priming Valve
5.Check Valve
6.Outlet Pressure Gauge
7.Motor
8.Pump
9.Inlet Pressure Gauge
10.Inlet Piping
11.Inlet Piping Support
12.Vibration Damper
13.Filter
14.Inlet Tank
15.Foot Valve
Fig. 4.1
Good
Bad
0.01~0.02 slope
Fig. 4.2
Bad Piping Designs
Fig. 4.3
>1.5D
>0.5m
or
>2D
>1.5D
D=Diameter
Fig. 4.4

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Procedure Items to Note
Inlet Piping
General
requirements
1. Suction condition must satisfy NPSHa>NPSHr+0.5 m.
2. Reduce inlet Head as much as possible. Use straight and short piping.
3. The pipes should have adequate structural support and shouldn’t use
the pump as its primary support. (see Fig. 4.1)
4. When designing supports, consider the effects of temperature changes
on the supports to avoid thermal stress.
5. Inlet piping and connectors should be installed properly to prevent
drawing in air.
6. The piping system should not have upward bumps that may collect air.
The inlet piping should also have a 0.01~0.02 slope increase towards
the pump. (see Fig. 4.2)
7. There should not be any elbows for at least 5 times the pipe diameter
from the opening of the pump. The elbow closest to the pump opening
should be a long radial elbow.
Inlet piping
1. There should be at least a 1.5 diameter distance between the pipe inlet
and the closest tank wall to prevent circulation. (see Fig. 4.4)
2. The submerge depth of the inlet should be at least 0.5m or at least
twice the pipe diameter below the liquid surface. (see Fig. 4.4)
3. There should be a distance of at least 1.5D between the bottom of the
tank and the beginning of the inlet pipe opening. (see Fig. 4.4)
4. If there are two or more inlet piping in the same tank, they should be
placed at least 3D apart to prevent mutually disrupting each other’s
flow.
Foot valve Please install a foot valve if upward suction is used. (see Fig. 4.1)
Self-priming
cylinder
1. If suction method is upward suction, please install a self-priming
cylinder to prevent dry-running due to a leaking foot-valve.
2. The size of the self-priming cylinder should have a minimum liquid
level of at least 0.5 m above the opening of the pump.
Control valve
1. A control valve should be installed to make disassembling of the pump
easier. The valve should only be shut off when the pump is to be
detached for maintenance or repairs.
2. We recommend the use of valves that have the least loss when fully
opened, like a gate valve.
Filter
1. It is generally not recommended to install a filter in front of a pump,
which can unpredictably increase suction system resistance.
2. If a filter has to be used, it should be cleaned regularly to ensure a
smooth flow.
Vacuum gauge
1. The material used should be corrosion resistant; otherwise, a pressure
gauge diaphragm should be used.
2. During operation, if the vacuum gauge reading fluctuates, either there
are air bubbles in the system or cavitation has occurred.

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Procedure Items to Note
Outlet Piping
General
requirements
1. The weight of the outlet piping should be properly supported to prevent
putting excessive stress on the pump. (see Fig. 4.1)
2. A priming piping must be installed if the suction system does not
employ positive pressure, i.e. upward suction. (see Fig. 4.1)
3. The flow rate in the outlet piping should not exceed 3 m/sec.
4. The ability for each component in the piping system to withstand
pressure should be calculated, to determine the maximum allowable
operating pressure.
Priming piping Upward suction pumps that do not have a self-priming cylinder should
have a priming piping system.
Pressure gauge
1. Pressure gauge used should be able to read beyond the maximum
operating pressure.
2. Pressure gauge should be made of material that is corrosive resistant;
otherwise a diaphragm should be used.
3. A valve can
b
e installed on the piping that leads to the pressure gauge,
to facilitate maintenance and to lengthen the gauge’s service life.
4. During operation, if the pressure gauge reading fluctuates, either there
are air bubbles in the system or cavitation has occurred.
Check valve
A check valve should be installed in the following situations:
1. Discharge pressure exceeds 2 kg/cm2and flow rate exceeds 3 m/sec.
2. Two or more pumps share the same outlet piping system.
3. To prevent back flow (water hammer) from damaging the pump during
unexpected power outages.
Control valve
1. A control valve can be used for controlling the flow of fluids. Do not
run the pump with the control valve closed for an extended period o
f
time.
2. When starting the pump, always start with a closed valve, and then
slowly open the valve to obtain the desired operating pressure and
flow. Always open or close the valve gradually.
Exhaust valve A vent should be installed if the horizontal section of the outlet piping is
very long.
Inlet Piping
General
requirements
1. Suction condition must satisfy NPSHa>NPSHr+0.5 m
2. Reduce inlet Head as much as possible. Use straight and short piping.
3. The pipes should have adequate structural support and shouldn’t use
the pump as its primary support. (see Fig. 4.1)
4. When designing supports, consider the effects of temperature changes
on the supports to avoid thermal stress.
5. Inlet piping and connectors should be installed properly to prevent
sucking in air. (see Fig. 4.3)
6. The piping system should not have upward bumps that may collect air.
The inlet piping should also have a 0.01~0.02 slope increase towards
the pump. (see Fig. 4.2)
7. There should not be any elbows for at least 5 times the pipe diameter
from the opening of the pump. The elbow closest to the pump opening
should be a long radial elbow.

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Procedure Items to Note
Inlet piping
1. There should be at least a 1.5 diameter distance between the pipe inlet
and the closest tank wall to prevent circulation. (see Fig. 4.4)
2. The submerge depth of the inlet should be at least 0.5 m or at least
twice the pipe diameter below the liquid surface. (see Fig. 4.4)
3. There should be a distance of at least 1.5D between the bottom of the
tank and the beginning of the inlet pipe opening. (see Fig. 4.4)
4. If there are two or more inlet piping in the same tank, they should be
placed at least 3D apart to prevent mutually disrupting each other’s
flow.
Foot valve Please install a foot valve if upward suction is used.
Self-priming
cylinder
1. If suction method is upward suction, please install a self-priming
cylinder to prevent dry-running due to a leaking foot-valve.
2. The size of the self-priming cylinder should have a minimum liquid
level of at least 0.5 m above the opening of the pump.
Control valve
1. A control valve should be installed to make disassembling of the pump
easier. The valve should only be shut off when the pump is to be
detached for maintenance or repairs.
2. We recommend the use of valves that have the least loss when fully
opened, like a gate valve.
Filter
1. It is generally not recommended to install a filter in front of a pump,
which can unpredictably increase suction system resistance.
2. If a filter has to be used, it should be cleaned regularly to ensure a
smooth flow.
Vacuum gauge
1.The material used should be corrosion resistant; otherwise, a pressure
gauge diaphragm should be used.
2.During operation, if the vacuum gauge reading fluctuates, either there
are air bubbles in the system or cavitation has occurred.
Outlet Piping
General
requirements
(see Fig. 4.1)
1. The weight of the outlet piping should be properly supported to prevent
putting excessive stress on the pump.
2. A priming piping must be installed if the suction system does not
employ positive pressure, i.e. upward suction.
3. The flow rate in the outlet piping should not exceed 3 m/sec.
4. The ability for each component in the piping system to withstand
pressure should be calculated, to determine the maximum allowable
operating pressure.
Priming piping Upward suction pumps that do not have a self-priming cylinder should
have a priming piping system.
Pressure gauge
1. Pressure gauge used should be able to read beyond the maximum
operating pressure.
2. Pressure gauge should be made of material that is corrosive resistant,
otherwise a diaphragm should be used.
3. A valve can be installed on the piping that leads to the pressure gauge,
to facilitate maintenance and to lengthen the gauge’s service life.
4. During operation, if the pressure gauge reading fluctuates, either there
are air bubbles in the system or cavitation has occurred.

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Procedure Items to Note
Check valve
A check valve should be installed in the following situations:
1. Outlet piping is long.
2. Head of outlet is more than 15 m.
3. Discharge pressure exceeds 1.5 kg/cm2and flow rate exceeds 2.5 m/sec
4. Two or more pumps share the same outlet piping system.
5. To prevent back flow (water hammer) from damaging the pump during
unexpected power outages.
Control valve
1.A control valve can be used for controlling the flow of fluids. Do not
run the pump with the control valve closed for an extended period o
f
time.
2. When starting the pump, always start with a closed valve, and then
slowly open the valve to obtain the desired operating pressure and
flow. Always open or close the valve gradually.
3. To facilitate the adjustment of discharge flow and the adjustment o
f
motor overload, it is recommended to install valves on outlet piping.
And if both a check valve and a control valve are to be installed, the
order of allocation is pump → check valve →control valve.
Exhaust valve A vent should be installed if the horizontal section of the outlet piping is
very long.
Be cautions when dangerous liquids are transferred: When the pumps are used to
transfer dangerous liquids listed as below, the pump, piping and fittings must be
checked and monitored to ensure no leakage occurs. Leakage may result in
personal injury, explosion, and/or fire.
1.Explosive and inflammable liquids.
2.Corrosive liquids.
3.Toxic liquids.
4.Liquids harmful to the human body or detrimental to health.
5.Liquids that could produce a chemical reaction.
4.4 Wiring
The wiring system should be done properly by qualified personnel, using premium
equipment and complying with established rules and standards. The following
recommendations should also be implemented:
(1) Power frequency, voltage and capacity should strictly follow the motor’s specification
sheet and name plate.
(2) Please select the proper non-fuse switch (NFB) according to the rated current of the
motor.
(3) When using the pump for outdoor applications, please make sure the switch is protected
from rain.
(4) Keep the electromagnetic contactor (MC) from a pump at a suitable distance, with a
clearly marked warning sign to avoid false starts.
(5) Tags at the end of wires (or diagram shown in the terminal box) and method of
connection are based on the number wires (phases), power voltage and mode of start
for the motor. Be sure to connect the power cable in accordance with name plate for the

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motor and the connection diagram in the terminal box
(6) All wiring operations must be in strict compliance with National Electrical Code and
local regulations. Make sure to choose the correct wire size and fasten the locking
screws to the right torque to prevent loose connections.
Table 4.1 Wire size
Model Min. wire size (Recommended)
AM-10/30/50 1.6 mm2
Table 4.2 Terminal screw and tightening torque
Screw size Tightening torque (Recommended)
M4 15 kgf-cm
M5 25 kgf-cm
M6 45 kgf-cm
M8 80 kgf-cm
M10 120 kgf-cm
Table 4.3 Recommendations for Grounding Wire
Cross-sectional area of copper phase
conductors supplying the equipment
S mm2
Minimum cross-sectional area of the
external protective copper conductors
SPmm2
S ≦16 SP
16 ＜S ≦35 16
S ＞35 2
SP
1. Be sure not to performing any type of maintenance while the power is on. It
may lead to electric shock.
2. Power supply and wire connecting work should be performed by qualified
personnel only.
3. After wiring, be sure to replace the terminal box cover in its original position.
Failure to do so could result in electrical shock.
1. Install an earth leakage breaker: The operation of a pump without using an
earth leakage breaker may cause an electrical shock. Install an optional
leakage breaker in the system before running operation.
2. The pump should be properly grounded with a recommended ground
resistance of 10 Ωor less. (In Taiwan, use third type grounding)
3. Each pump must have a separate grounding wire directly connected to the
common ground terminal, and must not form a loop between wires.
4. If long wiring results in more than 3% voltage drop in the line, replace with
bigger gage wires.

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5. Notes for Operation
5.1 Dry-Running
(1) Our pump use the transfer fluid as its internal cooling system, therefore, dry-running
the pump can cause the temperature to rise to a dangerous level that may seriously
damage the pump.
(2) If dry-running occurs, switch off the pump immediately. Let it cool for at least an hour
before priming the pump to prepare it for normal operation. NOTE: Do not subject the
pump to rapid cooling, which may damage the internal parts.
(3) We recommend using a dry-run protector to detect dry-run occurrences to avoid
causing unnecessary damage to the pump.
5.2 Operating Temperature
(1) Operating temperature may change the fluid’s viscosity, vapor pressure, and
corrosiveness. Please ensure that your pump is operating within the proper temperature
range.
(2) The optimal temperature range for pumping pure water:
Casing material PP/PPG/PVDF: 0 oC～80 oC
Casing material ETFE+CF: 0 oC～95 oC
(3) Please consult your local distributor for the temperature range suitable for your
chemicals.
(4) We recommend an operating environmental temperature to be between 0oC～40oC.
When the pump is used with a hot liquid, do not touch the front cover or the
piping with your bare hands. It may cause burns. Any exposed hot surfaces,
including pumps, motors and piping, must have warning signs prominently displayed.
The parts should be isolated from accidental contact.
5.3 Concentrations, Viscosity and Specific Gravity
(1) A change in a fluid’s concentration will usually affect its viscosity and specific gravity.
Other physical properties like corrosiveness, may also change with the fluid’s
concentration, therefore, the selected pump material should be able to withstand the
corrosive properties of the fluid.
(2) When the fluid’s viscosity and/or specific gravity differ from that of water, the shaft
power, flow rate and pump head may change as well.
5.4 Particle Size (Sludge)
(1) The service life of a pump may be greatly shortened by pumping fluids that carry small
particles or sludge. Its service life is dependent on the concentration of the particles, its
size, and hardness.
(2) For particle concentration less than 5%, particle size smaller than 50 μm, and hardness
within 80 Hs, SSiC bearings may be used. However, a shorter-than-normal service life
can be expected.

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Should foreign matter enter the pump, it may cause pump damage or failure. Turn
off the power at once and remove the obstruction.
5.5 Minimum Flow
Our pump uses the pumped fluid as its cooling and lubricating system. A low flow rate
may result in increasingly high temperature within the pump, and increased radial and axial
force, thus, affecting the pump’s performance and service life. Please use Table 5.1 for the
recommended minimum flow rate.
Table 5.1 Unit: l/min
Temperature
Model 20 °C 40 °C 60 °C 80 °C
AM-10 5 7 10 15
AM-30/50 10 12 15 20
Note: The above data is based on water. For volatile or viscous fluids, consult your local distributor.
Do not operate the pump with outlet valve shut off more than 1 minute. Long shut
off time will cause the inside to heat up and may damage the pump.
6. Operating Procedure and Notes
6.1 Notes Prior to Starting the Pump
(1) Check the motor’s power rating, including frequency, voltage and wiring.
(2) Recheck to make sure all the parts (flange, pump casing, base plate, etc.) are securely
fastened.
(3) Fill the pump with liquid (priming) to remove any air within the pump and suction
piping.
(4) Check to ensure the inlet valve is open.
(5) Using a screwdriver, rotate the motor’s cooling fan to ensure it is not too tight or stuck.
6.2 Starting Up the Pump
(1) Check the direction of rotation of the motor by rapidly switching on and off the power.
(2) Direction of motor rotation can be checked from the fan side. It should be clockwise
seeing from the fan cover (follow arrow direction on the fan cover). If the rotating
direction reverses, change wiring phases by switching any two wire connections.
(3) Close the outlet valve and start up the pump.
(4) Slowly open the outlet valve when the motor has reached a stable speed. Adjust the
outlet valve to obtain the desired operating pressure or flow rate.
6.3 Operating the Pump
(1) Shut down the pump immediately in the case of cavitation or dry-running.
(2) If decoupling should happen, shut down the pump to prevent reducing the magnet’s
strength.

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(3) During power outages, shut off the pump’s power supply and close the outlet valve.
(4) When switching on the pump with the outlet valve closed, the outlet pressure should
increase. If the pressure fails to rise, or if the pressure is too low, shut down the pump
and check the piping and wiring.
NOTE: Outlet Pressure = Inlet Pressure + Pump Pressure
PumpPressure(kg/cm
2) = Fluid Specific Gravity * Pump Head / 10
6.4 Shutting Down the Pump
(1) Close the outlet valve slowly to prevent damage to the pump due to reverse fluid flow
(water hammer).
(2) Shut off the pump. It should stop gradually. If not, check the interior of the pump for
problems.
(3) The pump should be checked periodically. If the pump is used in a cold operating
environment (relative to the fluid’s freezing point), the fluid may crystallize even if the
pump is shut down for a very short amount of time. To prevent crystallization, a drain
plug should be included in the piping system or a heating system could be used to
maintain the temperature during shutdown.
7. Maintenance and Inspection
7.1 Daily Inspection (See Table 7.1).
Table 7.1
Appearance 1. Check for oxidation or corrosion of the front casing, bracket, and base plate.
2. Check for leakage of the pump and the piping system.
3. Check the pump exterior for any physical damage such as corrosion, peeled
paint.
Operation 1. Check for irregular sounds and vibrations.
2. Check for any abnormal overheating on the surface of motor, three-phase
current imbalance, bearing noise, and foreign objects blocking the vent of fan,
etc.
3. Check the in-tank fluid levels and inlet/outlet pressures.
4. Check the power supply and motor loading.
5. Check and test-run backup pumps regularly to ensure they can function
properly when needed.
7.2 Periodic Maintenance
The following items should be inspected quarterly (refer to Table 7.2).
Table 7.2
Part Name Inspection Item Solution
Front and Rear
Casing
1. Cracks
2. Scratch marks (except when pumping
particle laden fluids)
3. Crystallization or sludge
4. Shaft support loose or deformed
1. Replace
2. Contact the distributor
3. Clean
4. Contact distributor
O-ring Deformed, corroded or swollen Replace
Impeller and
Magnet 1. Scratch marks or cracks 2. Cracked bearing or crystallization 1. Contact distributor 2. Contact distributor

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Assembly 3. Bearing displays signs of wear and tear
4. Crystallization and other sludge
5. Foreign objects stuck in impeller
6. Impeller deformed
3. Replace if worn excessively
4. Clean
5. Remove the objects
6. Contact distributor
Shaft and Thrust
Ring 1. Scratch marks 2. Cracks 1. Contact distributor 2. Replace
Motor
1.Resistance of three phases and insulation
impedance
2.Check amount of lubricant when using
open bearing.
1. Repair or change if abnormal
is found.
2. Keep amount of lubricant at
proper level.
Used gasket or O-ring, even without displaying sings of corrosion, may also
cause seal failure due to deformation or elastic reduction. We strongly
recommend replacing the O-ring when the pump is under repair or service.
7.3 Maintenance and wear/tear limits
Table 7.3 Unit: mm
Model Dimension
Part New part Time to change
AM-10
AM-30
Shaft outer diameter 8 7.7
Bearing inner diameter 8.2 8.5
Thrust ring thickness 4 3.7
AM-50
Shaft sleeve outer diameter 11.2 10.9
Bearing inner diameter 11.3 11.6
Thrust ring thickness 4 3.7
Note: Table 7.3 provides the recommended dimensions for the bearing and shaft. However, the
total wear between the shaft and bearing (bearing ID – shaft OD) must not exceed 0.3
mm. Similarly, the total wear between the thrust ring and wear ring must not exceed 0.3
mm. When replacing the individual parts, you may choose to replace just the parts that
have more wear.
7.4 Preventive Maintenance
Operational data, like vibration,
flow rate, voltage, etc. can be collected,
and upper and lower limits can be set
for each of the values. The collected
data can be used for trend analysis (see
Fig. 7.1), which can be a basis in which
to determine when to carry out
preventive maintenance.
AM is made at factory with
vibration below 3.0 mm / sec (rms)
(measured at flange edge of bracket),
and the noise value is below 75 dB (at
rated point).
Fig. 7.1

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1. Strong magnetic field warning: AM’s powerful permanent magnetic coupling
could adversely affect persons who are assisted by medical electronic devices
such as a pacemaker.
2. Be sure to turn the power off before performing any type of maintenance,
repair or inspection. Make special provisions so that no other operator
mistakenly turns on the power supply while someone is working on the pump.
In a noisy or poor visibility environment, display a sign near the power supply
switch to notify others that someone is “WORKING” on the pump. Power
supply mistakenly turned on during maintenance may lead to personal injury.
1. When handling chemicals, ventilate the work area well. In addition, the
operator must wear protector gear (such as a safety mask, safety goggles, and
protective gloves).
2. No remodeling: Remodeling of the pump by the user may result in serious
injury, electric shock, or damage to the pump. Do not attempt to remodel as it
is very dangerous.
3. Strong magnetic warning: The impeller assembly contains strong magnets. Be
careful not to get your hands or fingers pinched during assembly of the pump.
Keep magnetic cards and electronic devices away from the pump to prevent
the magnetic field from causing damage.
1. Use the right tools for any maintenance, disassembly or assembly.
2. Be careful with hazardous liquids:
If pumping dangerous chemicals, be sure to drain the pump before
disassembling and rinse the parts and connecting pipes/fittings well after
disassembly. Please note that small amounts of chemical may still remain in
the internal parts or pipe fittings.
8. Incorrect Usage and Selection
Abnormal Condition Possible Symptom and Effect/Damage
Incorrect System Calculations or Incorrect
Pum
p
Selected
System resistance too high
or
Pump head too low
1. Insufficient or no flow.
2. Pump unable to effectively dissipate heat.
3. Excessive wear on bearing and thrust rings.
Resistance lower than expected
or
Pump head too high
1. Excessive flow.
2. Overloading of the motor.
3. NPSHa too low, resulting in cavitation.
NPSHa too low,
resulting in cavitation
1. High frequency vibration and noise.
2. Fracturing of the bearing and thrust rings.
3. Decreased pump performance and low flow rate.
4. Serious cases may result in dry-running.
Specific Gravity higher than
anticipated 1. Motor overloading. 2. Decoupling of the magnetic drive.
Viscosity higher than anticipated 1. Motor overloading. 2. Decoupling of the magnetic drive.
3. Decreased pump performance and reduced flow.
Wrong pump material selected 1. Corrosion and cracking. 2. Rapid corrosion and wearing of bearing.
3. Corrosion of the O-ring resulting in leakage.

AM SERIES
16
Abnormal Condition Possible Symptom and Effect/Damage
Improper Piping or
La
y
out
Inlet pipe not submerged
sufficiently into the fluid or air
sucked into piping system
1. Produce high frequency vibrations and noise.
2. Fracturing of the bearing and thrust rings.
3. Reduced pump performance.
4. Serious cases can lead to dry-running.
Air pockets in inlet piping 1. Reduced pump performance.
2. Serious cases can lead to dry-running.
Parallel pumps improperly installed Improper suction, resulting in low efficiency,
insufficient flow, cavitation or dry-running.
Leaking foot valve or inlet piping Fluids within pump leaks during shut-down period,
resulting in dry-running when pump is restarted.
Improper Operation
Starting the pump without priming Dry-running, causing damage to pump.
Low speed or wrong rotation
direction Low fluid flow.
Incorrect motor frequency or
voltage Overloading of the motor.
Low inlet tank fluid level
1. Low performance and vibrations due to drawing
in air.
2. Fracturing of the bearing and thrust rings.
3. Dry-running.
Foreign objects stuck in impeller 1. Produce vibrations and noise. 2. Reduced efficiency and flow. Serious cases may
result in dry-running.
Low flow over extended period of
time
1. Insufficient cooling of pump.
2. Excessive radial and axial force, reducing service
life of bearing and thrust rings.
Inlet valve closed Dry-running, seriously damaging the pump.
Transfer fluid temperature too high 1. Low NPSHa, resulting in cavitation. 2. Reduced strength of the magnet, resulting in
decoupling.
Fluid carries hard particles 1. Rapid wearing of the bearing.
2. Wearing of the impeller and casing surfaces.
Improper Maintenance
Deformation of the O-ring Result in leakage.
Damaged impeller 1. Resulting in vibrations and noise.
2. Reduced pump performance and fluid flow.
Damaged motor bearings 1. Produce vibrations and noise. 2. Overloads the motor.
3. High Motor temperature.
Wear ring worn off 1. Produce vibrations and noise.
2. Overloads the motor.
Wearing of the impeller bearings 1. Produce vibrations and noise.
2. May result in fracturing of the impeller shaft.
Pump’s base screws loose Produce vibrations and noise.
Blockage of inlet piping or foot
valve
1. Reduced pump performance and low flow rate or
may result in cavitation.
2. Serious cases may result in dry-running.
Blockage of the outlet piping
1. Low flow or no flow.
2. Pump unable to dissipate heat.
3. Serious cases may result in overheating of the
pump and outlet piping

AM SERIES
17
9. Repair and Warranty
When a problem arises, please read this instruction manual and try to troubleshoot the
problem. If the problem cannot be found, or if replacement parts are needed, please call the
distributor, and give them the following information:
(1) The pump model and manufacturing serial number indicated on the nameplate.
(2) The operating condition.
(3) The situation under which the pump fails.
Please refer to the warranty card for details of the warranty terms and conditions.

AM SERIES
18
Annex A: Exploded View and Parts List
No. Part Name No. Part Name
F21 Inlet Flange L02 Impeller
RG O-ring S34 Rear Thrust Ring
101 Front Casing 161 Rear Casing
F31 Outlet Flange 847.8 Drive Magnet
S31 Front Thrust Ring B21 Bracket
S11 Shaft B11 Base
S21 Bushing EM Motor
RG 161 847.8
B21 EM
B11
S21 S34
L02
S21
S11
S31
F31
RG
RG
F21 101
Table A: AM series tightening torque Unit: kgf-cm（1 kgf-cm=0.1 N-m）
Model Item Material
PP/ PPG PVDF ETFE+CF
AM-10
Front Casing & Bracket 18 25 -
Bracket & Motor 50 -
Drive Magnet & Motor 50 -
AM-30
AM-50
Front Casing & Bracket 75
Base & Bracket 100
Bracket & Motor 100
Drive Magnet & Motor 50