MDF-L Iwaki Instruction Manual 5-05.pdf

8/10/2019 MDF-L Iwaki Instruction Manual 5-05.pdf

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- 1 -

For the Safe and Correct Handling of the Pump

Before use of the pump, read carefully this "Safety Section" to prevent accidents and toavoid the damage or loss of other assets.

Observe and abide by the instructions described in this "Safety Section". These

instructions are very important for protecting pump users or other persons from

hazard or from loss of assets.

Meaning of symbols

Following two symbols describe the extent of hazards and loss which may brought if the

instructions are not observed or if the pump is wrongly used.

Following two symbols describe the content to be observed.

SAFETY SECTION

WarningNonobservance or misapplication of the contents ofthe "Warning" could lead to a death or heavy injury of

person.

Caution

Nonobservance or misapplication of the contents of the

"Caution" could lead to a injury of person or damage of

assets.

Prohibited action or procedure is indicated. Inside or

near this circle, a concrete activity to be prohibited is

depicted.

Action or procedure which must be performed without

fail is indicated. Inside this circle, a concrete activity

to be performed is depicted.


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Warning

Magnet field danger

The magnet drive pumps contain very strong magnets. The strong magnet field

could adversely affect persons who are assisted by electronic devices such as

pacemakers etc.

Always turn off power supply prior to maintenance works etc. Pay special attention

so that no other operator turns on by mistake the power supply while someone is

working on the pump. In a noisy or poor visibility environment, display a sign near

power supply switch to notify other person that someone is "WORKING" on the

pump. Power supply mistakenly turned on during maintenance works may lead to

personal injury. Each operator must pay special attention.

Wear protectors

When piping is removed or pump is disassembled/assembled, wear protective gear

such as safety goggles and protective gloves etc.

Lifting pump

When pump is lifted, apply chain or belt to eye bolt and motor to keep the pump &

motor horizontally.

No remodelingRemodeling of pump may result in serious personal injury or damage of the pump.

Do not attempt remodeling pump because it is very dangerous.

Power off

Wear protectivegear

No Remodeling

Dangerous liquid

When the pump is used to transfer dangerous liquids mentioned as below, the

pump must always be checked and watched so that the liquid can not be leaked.

The operation of pump leaking the liquid may result in personal injury, explosion or

fire accident.

Explosive or flammable liquids

Corrosive or stimulus toxic liquids Liquids harmful to human health

Safety Section


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CAUTION

Attention to magnetic force

This pump employs strong magnets. Special attention must be paid not to be injured

by attracting force of magnets. Follow the procedure "Disassembling and

Assembling" when the maintenance works are done.

Do not run pump dry

Do not run pump dry (without liquid). If the pump run dry, heat is generated by

rubbing, which causes pump damage. If the pump is operated with suction side

valve closed, the pump runs dry.

Countermeasures for static electricity

When low electric conductivity liquid such as ultra-pure water and fluor inactive

liquid (e.g. Fluorinert are handled, the static electricity may be generated in the

pump, which may cause static discharge and pump break down. Take

countermeasures to avoid and remove the static electricity.

Qualified operator

The pump must be handled or operated by the person who has enough knowledge

and well acquainted with the pump.

For specified application only

The use of pump in any application other than those clearly specified may result in

the failure or damage of the pump.

Do not run dry

Disposal of used pump

Disposal of used or damaged pump must be done in accordance with local laws andregulations. (Consult a licensed industrial waste products disposing company.)

Ventilate the site

When handling the liquid which may generate toxic gas, safety measures such as

ventilation must be taken to prepare for the accidental liquid leakage.

Countermeasure to liquid flowing out

Protective measurement must be taken against liquid flowing out caused by

damage of pump or pipe by accident. Also, appropriate measurement must be taken

so that the liquid can not directly flow out on the ground.

Safety Section

Eliminate air in pump chamberBefore full operation of pump, run pump to eliminate air from pump chamber.

Above all when pumping liquid which easily generates bubbles (hydrogen peroxide,

sodium hypochlorite or so), eliminate air every time when pump is operated.

Operation of pump with air remaining in pump chamber may heat rubbing parts of

pump resulting in pump damage.


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- 5 -

1. Unpacking and inspection

w ak i Magnet Pump

MODEL

HEAD

CAPACITY

MFG.No.

(m)

(r/min)

I W A K I C O . L T D .

TOKYOJAPAN

2P4038461

kW Hz rpm

After unpacking, check the following points to confirm that

the delivered product and its accompanying parts and

elements are exactly what you ordered.

[1] Do the model and frequency indicated on the nameplate

conform to your order?

[2] Prior to the installation of the MDF-LMKK pump

(using SiC liner ring and mouth ring), remove the

cardboard pad inserted inside the suction port.

[3] Has the pump unit or any part of it been damaged or

bolts and nuts been loosened during delivery?

2. Description on body and label

Pump unit (liquid feeding section)

No self priming: Before operating the pump,

feed liquid through the suction

or dischargeside port.

Motor nameplate

Use only the power voltage specified on the

nameplate. (Follow applicable local power

regulations.)

"Rotation" indicator label

The arrow indicates the rotatingdirection of the motor.

Always make sure that the motor

runs in the direction the arrow

indicates. (Refer to chapter

"Operation".)

Motor (Driver)

This motor provides power to the

pump unit.

BasePump should be fixed firmly.

Discharge port

Suction port

Drain port

Drain the discharged liquid into a

suitable container and follow the

applicable local regulations in

disposing of the liquid. Never

allow the discharged liquid to

flow directly onto the ground."Never Run Pump Dry" label

Operating the pump without liquid will cause damage inside the

pump. Never operate the pump without liquid. (Refer to pump

model code u.)

CAUTION

When cleaning the pump, do not wipe the labels or the pump body with

solvent.

Pump specification nameplate

Pump must be operated according to

the specified conditions.


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3. Model code

Example:

MDF-L 42 5 CF V T - D H1q w e r t y u i

q Series MDF-L Type Series

w Nominal bore size Suction Dischage (mm)

25 : 25 25

40 : 40 40

42 : 50 40

e Motor output 0: 0.4 kW 1: 0.75 kW 2: 1.5 kW 3: 2.2 kW5: 3.7 kW Motor poles : 2P

r Material of bearing/spindle CA: High density carbon/Alumina ceramics 95%

CF: High density carbon/Alumina ceramics 99.5%

CC: Alumina ceramics 95%/Alumina ceramics 95%

AA: Alumina ceramics 99.5%/Alumina ceramics 99.5%

KK: SiC/SiC

t Material of O ring and gasket V: FKM E: EPDM A: AFLAS

FKM, AFLAS: Fluoro rubber

EPDM: Ethylene propylene rubbe

y Code of impeller T, V, W: Standard (50Hz) X, Y, Z: Standard (60Hz)

K, L: For high head applications (50Hz)

P, Q: For high head applications (60Hz)

u Construction code D: Pump can run dry for max. one hour.

E: Pump can not run dry.

i High temp/

High pressure version

No code: Standard

H: For high liquid temperature(Max. 100 deg. C for 250/401)

H1: For high allowable pressure

(Max. 0.5MPa for 42 model)


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Operating condition of pump

[1] Allowable pressure

Graphs below show maximum pressure resistance of pump. Pump discharge pressure should not exceed the

max. allowable pressure.

[2] Slurries containing liquid

Liquid containing slurries can not be pumped as a general rule, however the pump with SiC bearing (KK type)

can handle liquid containing slurries max. 5% concentration, particle size max. 50 and hardness max. 80Hs.

Consult us in advance when you wish to handle liquid containing slurries.

[3] Specific gravity and viscosity of pumped liquid influence pump performance

Shaft power, discharge capacity and head are influenced by specific gravity and viscosity of pumped liquid.

Pump is manufactured based on the information of specification and operating condition given to us when

ordered. If the informed specification and condition will be changed, ask us for the possibility of usage before

you use the pump.

[4] Influence by temperature

Pump itself is not influenced by temperature change but pumped liquid changes its viscosity, vapor pressure,

chemical corrosion characteristics etc. according to the change of temperature. Therefore enough attention

should be paid to the change of temperature of pumped liquid.

MDF-L401

0.3

0.24

0 90 100

High temp. type (H)High temp. type (H)

Temp

(deg. C)

Temp

(deg. C

Max.allowablepress.

(MPa)

MDF-L250

MDF-L425

0.3

0.16

0 90 100

0.5

0.45

0 100

MDF-L422, 423

0.5

0.4

0 100

Standard type

Max.allowablepress.

(MPa)

Standard type

High allow. press. type (HI)

Temp

(deg. C

Max.allo

wablepress.

(MPa)

Standard type

High allow. press. type (HI)

Temp

(deg. C)

Max.allo

wablepress.

(MPa)

Standard type

Ambient temp: 0~40 deg. C

Ambient humidity: 35~85%RH


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4. Names of parts

Names of Parts

MDF-L250 and 401

No.

1

2

3

5

7

8

9

11

12

13

15

16

17

No.

18

19

20

21

22

23

24

25

26

Q'ty1

1

1

1

1

1

2

1

1

1

2

Parts nameMaterial

M865, WITH SW, Q'TY5

FERRITE MAGNET+ALUMINUM ALLOY

STNLS STL

FC200

CFRETFE

PTFE

CFRETFE




Model 250 Model 401

Remarks

Front casing

Rear casing

Impeller

Drive magnet unit

Hex. head bolt

Hex. head bolt

Foot support

Cover A

Cover C

Cover B

Magnet capsule

Motor

Cap

Q'tyParts nameRemarks

JIS B 2401G 135

Only "H" type

Material

CF-D AA-E KK-ECC-ECA-D

PTFE

V: FKM E: EPDM A: AFLAS

Steel

STNLS STL

Alumina

ceramics 95%

Alumina

ceramics 99.5% SiC

1

1

1

1

1

1

2

1

1

Liner ring

High density carbon

Impeller thrust

Spindle

Bearing

Mouth ring

O ring

Gasket

Eye bolt

Rear casing cover

JIS B 2401G 160

Only model 401

16 13225911

1

12

22

18

3

17

24

23

19152152026

8 7


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MDF-L422, 423 and 425

Drawing shows standard type

No.

1

2

3

5

7

8

9

11

12

13

15

No.

18

19

20

21

22

23

24

25

26

Q'ty

1

1

1

5

1

1

1

2

1

1

Parts name Material

M10 40 WITH SW

RARE EARTH MAGNET+FCD450

FC200

CFRETFE

CFRETFE

M10 75 WITH SW

Front casing

Rear casing

Impeller

Drive magnet unit

Hex. socket head bolt

Hex. socket head bolt

Foot support

Cover A

Cover C

Cover B

Magnet capsule

Motor

Cap

Q'tyParts name Remarks

JIS B 2401 G 165

For H1 type

For standard type

Material

KK-EAA-ECF-D

PTFE

Steel

STNLS STL

High densitycarbon

Alumina ceramics 99.5%

SiC

1

1

1

1

1

1

2

1

1

Liner ring

Impeller thrust

Spindle

Bearing

Mouth ring

O ring

Gasket

Eye bolt

Rear casing cover

29 1Retainer ring

PTFE

16

17

1

1

2

STNLS STL

Remarks

V: FKM E: EPDM A: AFLAS

7

23

24

17

3

18

22

12

1

20 5 21 15 19

16 9 25 211

13

29

8


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1. Installation................................................11

2. Piping........................................................ 12

3. Electrical wiring.......................................14

INSTALLATION


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2. Piping

1. Tightening of pipe flange

Table below shows the bolt size and tightening torque for the connection of pipe flange to pump flange. Tightening

torque is the figure when metallic flange and rubber gasket are used.

2. Pipe load and moment

Pipe load and moment put on the pump should not exceed the figures shown below.

Pump model

MDF-L401, 422, 423, 425

Tightening torque

79 N m

Z

X

YX

ZY

Allowable pipe load on pump flange

Direction of loadSuction flange

FxFy (Pression/Tension) 0.58

Fz 0.71

Load kN

Discharge flange

0.71 0.89

0.58

0.89/0.44

Allowable moment on pump flange

Direction of loadSuction flange

Mx

My 0.35

Mz 0.23

Moment kN m

Discharge flange

0.35 0.46

0.23

0.46

MDF-L250 42 N m

Bolt size

M12

M16


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3. Suction piping

(1)Flooded suction

Flooded suction is recommended.(2)Pipe diameter

Pipe diameter should be larger than pump inlet bore.

(3)Shortest piping

Employ less bends and shortest piping length.

(4)Straight piping

Employ straight pipe just before pump inlet port.

Pump inlet bore 50A or smaller : Straight pipe of 500 mm or longer

Pump inlet bore 65A or larger : Straight pipe of 8 times as larger than inlet port

For the easy pump dismantling and maintenance, install a removable short length pipe of 300mm or so in straight

piping.

(5)Air pocket in piping

Do not allow any projection in piping where air may be trapped along the suction pipe.

Suction pipe should have an ascending gradient of 1/100 toward the pump.

(6) Different diameter of pipes

If diameter of pump suction port is different from that of suction pipe, use the eccentric reducer pipe. Connect the

eccentric reducer pipe so that upper side is level. Residual air may not go out if it is mounted in reverse.

(7) Gate valve in suction side

In case of flooded suction, install gate valve in suction piping. It is needed when the pump is disassembled and

inspected.

(8)Piping for flushing

Install pump flushing piping in case that the dangerous liquid will be handled.

(9) End of suction piping

The end of suction pipe always should be located 500 mm or more below the liquid level. Take care so that air can

not be sucked in suction piping.

(10) In case of suction lift piping

The end of suction piping should be 1 to 1.5 times of pipe diameter or more away from the bottom of suction

tank.

Install foot valve or check valve in suction piping.

(11)Pipe support

Install the pipe support so that the weight of pipe can not be directly loaded to the pump.

(12)Pipe connection

Pipes must be connected securely so that the air can not be sucked in. If the sealing is not perfect, air is sucked in,

which causes pump damage.


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4. Discharge piping

(1)Pipe diameter

In case the discharge piping is long, the specified performance may not be obtained because of unexpected piperesistance if the pipe diameter is the same as pump bore. Calculate the pipe resistance in advance to decide proper

diameter of pipe.

(2) Position of the first valve

Take 1m or so distance between pump and the valve located the nearest to pump and install air eliminating piping

at the place close to the nearest valve to the pump so that air can not remain in pump. Refer to Example of recom-

mended piping on page 10.

(3)Gate valve

Install the gate valve in discharge piping to adjust flow rate and to protect motor from over loading. If the check

valve is also installed, recommended arrangement is : Pump / Check valve / Gate valve

(4)Pressure gauge

Install a pressure gauge in discharge piping to check the operating conditions such as discharge head etc.

(5)Check valve

Check valve must be installed in the following cases.

Discharge piping is longer than 15 to 20 meters.

Actual head exceeds 15 meters.

Height difference between liquid level and discharge pipe end exceeds 9 meters.

When two pumps are used in parallel.

(6)Air vent

If horizontal discharge piping is longer than 15 to 20 meters, install air vent on the way.

(7)Drain

If the liquid must be drained to protect from freezing, install the drain valve.

(8)Pipe support

Install the pipe support so that the pipe weight can not be loaded to pump.

(9)Priming piping

Install piping for priming in case of suction lift.

3. Electrical wiring

Electrical works or wiring must be carried out by qualified and authorized person according to local law or regulation.

Use the electromagnetic switch which conforms to motor specifications such as voltage and capacity etc.

If pump is installed outdoor, wiring must be done so that water can not get into switch.

Electromagnetic switch and push-button switch must securely installed apart from the pump.


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1. Precautions on operation

CAUTION

Never operate pump dry or with suction side valve closed.

Dry running possible model (D type of carbon bearing) can run dry (completely no liquid in pump)

continuously one hour max. However rubbing parts are worn in a short time which will result in pump

damage in the worst case if pump runs dry continuously exceeding one hour or if it runs dry repeatedly

although it is short time.

After the pump ran dry, leave the pump one hour or more for cooling down to start it once again. If the

liquid flows into the pump just after the pump ran dry, ceramic parts are cracked due to heat shock.

Check the direction of rotation of pump. Clockwise seen from motor fan is correct direction. If operated

in reverse, pump may be damaged.

Stop the pump within one minute if it is operated in cavitation. Do not run pump with air sucking in.

If magnet coupling is disconnected, pump can not transfer liquid. Stop pump within a minute and settle

the cause of disconnection before pump is started again.

Intermittent operation

Frequent repetition of stop/start is not recommended. Stop/start repetition must be limited to six times

an hour. Frequent stop/run more than six times an hour may cause accelerated damage of parts and

lowered durability.

Temperature change at starting, stopping and operating of pump must be within 80 deg. C.

Fully close the discharge valve when pump is started to avoid water hammer.

If the pump is operated with discharge valve closed for a long time, the liquid temperature inside thepump rises, which may cause pump damage. Do not run the pump for more than one minute with

discharge valve closed.

If power is interrupted while pump is running, switch off pump and close discharge valve.

Pay attention so that discharge pressure can not exceed pump allowable pressure.

Observe the allowable minimum flow rate. If the pump is operated below the allowable minimum flow

rate, bearing or rubbing parts may be seizured due to lack of lubrication and cooling.

Allowable min. flow rate MDF-L250, 401 : 10 L/min.

MDF-L422, 423 : 20 L/min.

MDF-L425 : 50 L/min.

When high temperature liquid is transferred, pump surface becomes very hot. Take protective measureagainst burn.

Liquid temp. Max. pump surface temp. (Amb. temp. 40 deg. C)

90 deg. C 80 deg. C

100 deg. C 90 deg. C

Pump noise

MDF-L250: 75dB

MDF-L401, 422, 423, 425: 80dB


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2. Operation (Starting)

1. Fully close discharge valve and fully open suction valve.

2. Fill liquid into pump

In case of flooded suction, confirm if suction valve is fully opened. In case of suction lift, prime to fill liquid into suction piping.

3. Check rotating direction of motor.

Start motor momentarily (within a second) to check direction. Direction is shown on "arrow" mark on pump.

(Clockwise seen from motor fan side)

Also check if motor fan smoothly stops when switched off. If it does not stop smoothly, pump rotating parts may

be locked. Check the rotating parts.

4. Air vent operation

Before pump operation, vent the air in the pump.

Fully open the valve in air vent piping and repeat one second running for three to five times.

After the air vent running, fully close the discharge valve.Note: In case air vent piping is not equipped, open the discharge valve to repeat momentary run several

times.

5. Starting pump

Start pump with discharge valve fully closed. (Maximum one minute)

Confirm that discharge pressure rises to shut-down pressure.

Gradually open discharge valve to get specified pressure (capacity).

Note: Pay attention to over-load caused by excessively opened valve.

Keep minimum allowable capacity to avoid seizure of bearing or rubbing parts.

3. Pump stopping

1. Slowly close the discharge valve

Quick closing of valve may cause water hammer and pump damage.

2. Switch off and stop the pump

Confirm if pump stops smoothly. If pump stops suddenly and not smoothly, inspection is needed.

3. When the pump is stopped for a long period, anti freezing measure must be taken so that the liquid can not be frozen

in the pump or piping.

Model

MDF-L422,423

Min. flow

20L/min

MDF-L425 50L/min

MDF-L250, 401 10L/min


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1. Troubleshooting......................................19

2. Maintenance & inspection....................21

3. Disassembling & assembling..............25

4. Spare parts..............................................28

Maintenance


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1. Troubleshooting

Troubles

Liquid can not

be sucked

Lack of priming

liquid

Dry running

Foot valve is cl-

ogged by foreign

matters.

Stop pump and reple-

nish pump with liquid to

re-start.

Primed liquid drops

quickly

Clean foot valve

Check if foreign matters

are not adhered to valve

seat.

When disch. valve

closed

After starting, pres-

sure drops as soon as

discharge valve is

opened.

Air is sucked from

suction pipe or gas-

ket.

Check if connected

flanges are completely

sealed.

Check if liquid level oftank is not excessively

lowered.

Disconnected ma-

gnet coupling

Check amperage to see

if motor is not over-

loaded.

Check if foreign matters

do not lock imp-eller or

magnet capsule

Check if voltage is nor-

mal.

Press. gauge shows

low pressure

Low pump speed

Reverse rotation

Check wiring or motor.

Interchange wiring con-nection.

D i s c h a r g e

capacity is

small.

Pressure gauge &

vacuum gauge indi-

cates normal figure.

Strainer is clog-ged

by foreign matters.

Remove foreign matters.

Air pocket in suc-

tion piping

Check and remedy suc-

tion piping.

Foreign matters are

clogged at impeller

inlet.


Air is sucked in

from suction pipe or

gasket.

Check connection part

of pipes and retighten it.

Foreign matters

clog at discharge

side.


Remove foreign matters

or scales in piping.

Symptom on pump

Cause CountermeasuresWhen disch. valve

opened

Press. gauge & vacu-

um gauge indicate

zero.

Pressure gauge vi-

brates and drops to

zero.

Vacuum gauge indi-

cates high figure.

Vacuum gauge indi-

cates very high figure.

Pressure gauge &

vacuum gauge vi-

brate.

Vacuum gauge indi-

cates hign but pres-

sure gauge indicates

normal.

There are resis-

tance such as air

pocket etc. in suc-

tion piping.

Check if there is not pro-

truded section in suction

piping.


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Troubles

Symptom on pump

Cause CountermeasuresWhen disch. valve

closed

When disch. valve

opened

D i s c h a r g e

capacity is

small.

Pressure gauge &

vacuum gauge indi-

cates normal figure.

Pressure is high but

vacuum is normal.

Too high actual

head or too large

pipe resistance

Check actual head of

discharge piping and

loss of pipe resistance.

Pressure is low and

vacuum is very low.

Pressure is low and

vacuum is low.

Motor rotates in

reverse

Interchange motor

wiring.

Lowered power

voltage

Check voltage or fre-

quency.

Overload Check density and vis-

cosity of liquid

Too high ambient

temperature

Ventilate

D i s c h a r g e

capacity is

rapidly re-

duced.

Vacuum gauge indi-

cates high figure.

Foreign matters

clog suction piping.


Foundation is not

perfect.

Re-install the pump.

Loosened mount-

ing bolts.

Re-tighten

Cavitation occurs. Resolve the reason of

cavitation.

Worn or melted

bearing

Replace

Worn bearing of

motor

Replace bearing or

motor

Motor is ov-

erheated.

Pump vib-

rates.

Broken magnet

capsule or spindle

Replace

Bad dynamic bal-

ance of drive mag-

net

Resolve the reason or

replace


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2. Maintenance & inspection

Daily inspection

(1) Check whether the pump operates smoothly, without generating any abnormal noise or vibration.

(2) Check the level of the liquid in the suction tank and the suction pressure.

(3) Compare the discharge pressure and electric current measured during operation with the values indicated on the

motor nameplate for the verification of normal pump load.

* Note that the values indicated on the pressure gauge vary in proportion to the specific gravity of the liquid.

The cock of the pressure gauge or vacuum gauge must be opened only when measurement is carried out. It

must be closed upon the completion of each measurement. If the cock remains open during pump operation,

the meter mechanism may be affected by abnormal pressure caused by water hammer action.

(4) If a spare pump is available, activate it from time to time to keep it ready for use any time.

(5) Check to be sure there is no liquid leakage in the pump before operating it. If leakage is detected, never try to

operate the pump.

(6) Check to be sure the discharge pressure, discharge flow rate, and motor power supply voltage do not fluctuate

during pump operation. If considerable fluctuation of the respective values occurs, refer to "1. Causes of

Trouble and Troubleshooting" for correct measures.


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Periodical inspection (Once a six months)

Parts name Inspection items Countermeasures

Drive magnet If there is no rubbed trace. If abnormality is found, consult dealer.

If drive magnet housing is correctly

mounted or if hex. bolts are not loos-

ened.

Re-mount the drive magnet to motor shaft or re-

tighten the bolt.

Decentering of magnet and motor shaft.

(Max. 0.1 mm)

Re-tighten bolts or replace drive magnet. (Consult

dealer if replacement is needed.)

If abnormality is found, consult dealer.

If crack is found, replace.

Wear of thrust ring. If worn abnormally, consult dealer.

Resolve the reason.

Clean

Replace if abnormality is found.


Replace if excessively worn.

If there is no trace of cavitation.

(Abnormal wear, seizure etc.)

Consult if abnormality is found.


Rear casing Rubbed trace in inner surface.

If there is no cracks.

Dirt or clog inside impeller.

Change of dimension.

If there is no swelling or cracks in gas-

ket.

If there is no rubbed trace.

Spindle If there is no crack.

Wear against bearing

Dirty inside. Cleaning

Magnet cap-

sule

If there is no rubbed trace. If abnormality is found, consult dealer.

If there is no cracks. If abnormality is found, consult dealer.

Measure the bearing inner diameter. Replace if worn excessively.

If impeller is securely fixed to magnet

capsule.

If loosened, replace or consult dealer.

Impeller Measure the mouth ring thickness. Replace if excessively worn.

If there is no cracks. Replace if cracked.

Front casing Dirty wet-end. Clean If there is no cracks. Replace if abnormality is found.

If there is no abnormal wear, cracks,

rubbed traces in liner ring.

Consult dealer if abnormality is found.

Clogged drain. Clean


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Mouth ring

- 23 -

* If the difference between the inner diameter of the bearing and the outer diameter of the spindle exceeds 1 mm, either

the bearing or the spindle whichever has the greater wear, should be replaced regardless of the values in the above

table. In the case of a ceramic bearing type pump, the spindle and the bearing should be replaced simultaneously.

* Initial wear may appear in the sliding parts in the first stages of operation but this not abnormal.

Wear limit of mouth ring

Unit: mm

Wear limits of bearing and spindle

Unit: mm

* The step between the surfaces of the mouth ring and the impeller when shipped is 2 mm. The wear limit of the

mouth ring is reached when this step is reduced to 0 mm. Replace the mouth ring then

Model

Part

MDF-L250

MDF-L401, 422, 423, 425

When shipped Time to be replaced When shipped Time to be replaced

Inner diameter ofbearing

18 19 26 27

Outer diameter ofspindle

18 17 26 25

ModelMDF-L250, 401, 422,

423, 425

Thickness when shipped 8

Thickness to be replaced 6

When shipped 2 mm

Impeller


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Wear limits of tips of impeller thrust and spindle

(only for pumps with D or E at the end of model code)

Pumps whose model identification codes have D or E at the end are designed to result in contact between the impeller

thrust tip and the spindle tip in the event of an abnormal operating condition (cavitation, dry operation, etc.). If the tips

are worn out beyond the wear limit level, the pump is subject to serious damage. The condition of the tips in contact

must be checked if an abnormal profile such as dry operation or cavitation lasts a total of over 3 hours.

Wear checking steps

[1] Remove the rear casing from the foot support

and insert the magnet capsule attached to

impeller can into the rear casing.

[2] Rotate the impeller slowly by hand, with it

positioned on the rear casing.

Tips are not worn out beyond wear limit

The impeller and magnet capsule will continue

to rotate smoothly.

Tips are worn out beyond wear limit

The impeller and magnet capsule will not

continue to rotate smoothly. The contact at the

A section or B section, as shown in the figure of

the left, does not allow for the continuous

smooth rotation of the impeller and the magnet

capsule because the tips of the two elements are

excessively worn. In this case, replace the

impeller and rear casing with new ones.

Foot support

Rear casing

Impeller Impeller thrust

A section

B section

Spindle

Rear casingMagnet capsule


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Warning

Magnetic force is very strong. Pay attention when you handle the magnet capsule or driving magnet so thatfingers can not be injured by attraction of magnets.

The persons who are assisted by electronic devices such as pacemakers etc. are prohibited to approach the

magnet capsule and drive magnet.

Caution

Magnetic force is very strong. Pay attention so that iron pieces or powder can not be attracted to the magnet

capsule or drive magnet.

Do not approach the magnetic card to the pump not to break the data.

3. Disassembly and assembly

MDF-L250, 401

MDF-L422, 423and 425

Front casing

Front casing

Drain cap

Disassembly

(1) Disassemble only after thoroughly washing out the

liquid inside the pump by use of flushing piping,

remove the cap to discharge the liquid from the pump.

Then, clean the inside of the pump.

Warning

Wear protectors (goggles, rubber gloves, etc.).

Certain liquids are dangerous. They may hurt your

eyes and skin.

(2) Remove the front casing from the foot support.

Remove the hex socket bolts (or hex bolts) and take

out the front casing from the foot support.

Be careful with the spindle which remains pressed-fit

in the front casing.

Caution

Strong impacts may crack the spindle or casing.

Do not hit them with a tool.

* The spindle is integrated with the rear casing, not

pressed into the front casing.

* During disassembly, discharge the liquid from the

casing and clean the inside of the pump.


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- 26 -

Do not hit them with a tool.

* The spindle is integrated with the casing, not pressed

into the front casing.* During disassembly, discharge the liquid from the

casing and clean the inside of the pump.

(3) Pul l out the impeller and magnet capsule

assembly toward yourself.

Be careful not to scratch the surface of each part.

Since the magnet capsule is strongly magnetized, store

it in a place free of metal pieces or metal powder.

Handle the front casing, magnet capsule, and impeller

with extra care so as not to scratch the sliding surface

and sealing surface.

* Note on MDF-L250, 401

Then disconnecting the impeller from the magnet

capsule, hold the magnet capsule by hand and strike

the rear of the impeller gently with a resin hammer.

When the impeller is tightly pressed in and

disconnection is difficult, warm the impeller and

magnet capsule in hot water (about 90 deg. C) for 5

minutes prior to striking the impeller with the hammer.

* Note on MDF-L 422, 423 and 425

The impeller is fixed to the magnet capsule by screwing. When removing the impeller from the magnet capsule,

hold the magnet capsule by hand and rotate the impeller counterclockwise (from the impeller side).

If thread part is too tight and the impeller is not disconnected from the magnet capsule, put the magnet capsule with

the impeller on hot water (about 90 deg. C) for 5 minutes. And then rotate the impeller counterclockwise. Beware

of scald while this procedure.

(4) Remove the rear casing.

Insert a flat-head screwdriver into the perimeter of the rear casing and pull the rear casing forward while lifting it

slightly up.

* Pay extra attention not to scratch the sealing surface.

Impeller

Magnet capsule assembly

Rear casing


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- 27 -

Assembly

The pump should be assembled by carrying out the steps of disassembly in reverse. Pay attention to the following

points.

Replacement of O ring and gasket

When replacing the O ring or gasket, be sure to install a new one. In addition, see that the O ring or gasket is not

twisted or pressed by another part.

* The sealing section should be cleaned free of dust or scratches before installation.

Fastening Bolts

Fasten the bolts in diagonal order by applying the fastening torque shown in the following table. Apply an equal

torque to each bolt.

Model TypeFastening torque

NmSize of bolts

MDF-L 250Hex. head bolt 12.5

M835L, M865L

MDF-L 401 M840L, M870L

MDF-L 422, 423, 425 Hex. socket head bolt 24.5 M1040L, M1075L

* Note on MDF-L 250, 401

(1) Attach the impeller onto the magnet capsule. If this is difficult, warm the magnet capsule in hot water (about

90 deg. C) for 5 minutes before attaching it.

* Note on MDF-L 422, 423 and 425

(1) Attach the impeller to the magnet capsule.

Rotate the impeller clockwise, and tightly screw it in the magnet capsule. If it is hard to screw in,warm the magnet

capsule putting it in hot water of approx.90 deg. C for 5 minutes.

(2) Insert the impeller and the magnet capsule unit to the rear casing. Then, the rear casing, the impeller and the

magnet capsule set is installed onto the foot support.

Caution

Since the magnet used in the pump is very powerful, be carefulnot to get your fingers caught between elements by inserting

wood pieces or plastic pieces between the rear casing and the

foot support.

(3) Confirm there is no dust or scratches on the seal surface of the front

casing. Then, attach the O ring onto the front casing.

(4) Attach the front casing onto the foot support.

(5) Fasten the hex. socket head bolts in diagonal order, applying an equal torque to each.

Impeller

Spacer


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- 28 -

4. Spare parts

Appropriate spare parts are necessary to ensure long, continuous operation of the pump. It is recommended that

consumable parts be kept at hand constantly. When placing an order, supply the following information.

q Name of part and part number (in accordance with the drawings in this instruction manual)

w Pump model number and manufacturing number (as indicated on the pump nameplate)

e Drawing number if you have received the Iwaki-approved drawing

sCircle around a number is consumable parts.

No. Part Name Material MDF-L250 MDF-L401 MDF-L422 MDF-L423 MDF-L425

15

+

21

Magnet

capsule

CA

CFCFRETFE MFL1430 MFL0071 MFL1515 MFL1550 MFL1564

@4 Gasket

FKM MFL0031

EPDM MFL0032

Aflas MFL0033

@3 O ring

FKM MFL0034 MFL0080 MFL0130

Aflas MFL0036 MFL0082 MFL0132

AA CFRETFE MFL1432 MFL0073 MFL1516 MFL1551 MFL1565

KK CFRETFE MFL1433 MFL0074 MFL1517 MFL1552 MFL1566

2

+

19.1

+

20

Rear casing

unit

CF

AACFRETFE MFL1393 MFL1437 MFL1502

CA

CCCFRETFE MFL1392 MFL1436

KK CFRETFE MFL1394 MFL1438 MFL1503

CC CFRETFE MFL1431 MFL0072

EPDM MFL0035 MFL0081 MFL0131


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- 29 -

MDF-L422~425

MDF-L250


32/32

T307-6 '05/04

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Documents

MDF-L Iwaki Instruction Manual 5-05.pdf