IWAKI AMERICA MW-250 Series User manual

IWAKI AMERICA
MAGNETIC DRIVE PUMP
MX-(F)250 to 505 SERIES
INSTRUCTION MANUAL

Thank you for selecting an Iwaki America MX Series magnetic drive pump. This instruction manual
explains the correct handling, maintenance, inspection and troubleshooting procedures for your pump.
Please read through it carefully to ensure the optimum performance, safety and long service of your
pump.
TABLE OF CONTENTS
1 Unpacking and Inspection..................................................................................................... 1
2 Model Identification Guide ...................................................................................................2
3 Specifications......................................................................................................................... 3
4 Handling ................................................................................................................................ 8
5 Installation, Piping, and Wiring........................................................................................... 10
6 Operation ............................................................................................................................. 15
7 Maintenance and Inspection................................................................................................ 18
8 Troubleshooting................................................................................................................... 21
9 Parts Description and Exploded View................................................................................. 23
10 Disassembly and Assembly of Pump................................................................................... 26
11 Spare Parts ........................................................................................................................... 30
12 Weights and Dimensions ..................................................................................................... 31
This product is patent pending.
180242 Rev. I March 2015

1
1 Unpacking and Inspection
MODEL
HEAD (FT.)
CAPACITY (GPM)
IMPELLER DIAMETER
HOLLISTON, MASSACHUSETTS
www.iwakiamerica.com
Iwaki America
Mag-Drive Pump
HP
Hz.
RPM
SERIAL NO.
DIRECTION OF ROTATION
DO NOT RUN PUMP DRY
MX-
Open the package and check that the product conforms to your order. Also, check each of the following
points. For any problem or inconsistency, contact your distributor at once.
1. Check that the model number and the HP indicated on the nameplate conform to the specifications of
your order.
2. Check that all the accessories you ordered are included.
3. Check that the pump body and parts have not been accidentally damaged or that any bolts or nuts
have not been loosened in transit.

2
2 Model Identification Guide
MX(F)250-403(H)
MX
-
250
CFV
6
1
2
3
4
1Series Symbol
MX GFRPP casing
MX-F CFRETFE casing
2Pump Size
250 1” x 1” 0.5HP
251 1” x 1” 1.0HP
400 1.5” x 1.5” 0.75HP
401 1.5” x 1.5” 1.5HP
402H 2” x 1.5” 2.0HP
403H 2” x 1.5” 3.0HP
505 2.5" x 2" 5.0HP
3Materials of Bearing/Spindle/O-ring
MX
CV, CE Carbon/Alumina ceramic/FKM (EPDM)
RV, RE PTFE/Alumina ceramic/FKM (EPDM)
AV,AE Alumina ceramic/Alumina ceramic/FKM (EPDM) models MX-250 to MX-401
MX-F
CFV Highdensitycarbon/High purityaluminaceramic/FKM
RFV PTFE/High purity alumina ceramic/FKM
KKV SiC/SiC/FKM
AFV High Purity Alumina Ceramic/High Purity Alumina Ceramic/FKM
4Impeller Mark
MX
5 50Hz only
6 60 Hz only
7 larger impeller
MX-F
T,V,W 50 Hz only
X,Y,Z 60 Hz only

3
3 Specifications
Model
Suct x Disch
Max.
Discharge
Pressure
(ft)
Max Flow
(GPM)
Specific
Gravity
Motor
output @
50/60Hz
Motor
Frame
Weight (less
motor) lbs.
MX-250
1” x 1”
53
40
1.0
0.5 HP
56C
17.0
MX-251
75
40
1.0
1 HP
22.5
MX-400
6
1.5” x 1.5”
39
70
1.2
0.75 HP
13.7
7
43
MX-401
6
59
80
1.2
1.5 HP
22.5
7
68
MX-402
2” x 1.5”
73
107
1.2
2 HP
145TC
29.8
MX-402H
99
45
1.0
29.8
MX-403
101
130
1.2
3 HP
32.0
MX-403H
126
70
1.0
32.0
MX-505
2.5" x 2"
86
225
1.2
5 HP
184TC
59.5
MX-F250
1” x 1”
48
43
1.2
0.5 HP
56C
17.0
MX-F251
69
40
1.0
1 HP
22.5
MX-
F400
V
1.5” x 1.5”
43
65
1.2
0.75 HP
13.7
X
34
65
MX-
F401
V
68
86
1.5 HP
22.5
X
50
75
MX-F402
2” x 1.5”
70
120
2 HP
145TC
29.8
MX-F403
93
130
3 HP
145TC
32.0
Note 1: The specific gravity limit values shown above are with maximum impellers. The specific gravity limit
varies with the diameter. For details, contact your local distributor.

4
MX-(F)250, MX-(F)251, MX-(F)401
No.
Name
Qty
MX-250
MX-251
MX-401
MX-F250
MX-F251
MX-F401
1
Front casing
1
GFRPP
CFRETFE
2
Mouth ring
1
Filler charged fluororesin
PTFE or SiC
3
Impeller
1
GFRPP
CFRETFE
4
O-ring*
1
FKM/EPDM
JIS B 2401 G165
5
Bearing
AF
1
Carbon
Alumina Ceramic
CV, CF
HD Carbon
RV, RF
Filler charged fluororesin
PTFE
AV, KK
Alumina ceramic
SiC
6
Magnet capsule
1
Ferrite mag. + polypropylene
CFRETFE + Ferrite
7
Spindle
1
Alumina Ceramic 99.5%
Alumina ceramic or SiC
8
Rear thrust
1
CFRPPS
CFRETFE
9
Rear casing
1
GFRPP
CFRETFE
10
Drive magnet unit
1
Ferrite mag. + aluminum alloy
11
Motor
1
0.5 HP
1 HP
1.5 HP
0.5 HP
1 HP
1.5 HP
12
Base
1
GFRPP
GFRPP
13
Motor adapter
1
FC200
14
Hex head bolt
4
Steel
M8 x 20 w/PW, SW
15
Hex head bolt
6
SS
M8 x 35 w/PW, SW
16
Hex head bolt
2
SS
M8 x 50 w/PW, SW
18
Flange kit
2
GFRPP
CFRETFE
19
Liner ring
1
Alumina ceramic 99.5%
Alumina Ceramic 99.5% or SiC
21
Hex head screw
2
Steel M8 x 10
Steel M8 x 10
* Additional o-ring materials available upon request.
12 14 21 13 10 857649
1
2
19
3
16
15
11

5
MX-(F)400
*Additional o-rings materials available upon request.
11 12
15
16
3
19
2
1
14 21 13 10 857649
No.
Name
Qty
MX400
MX-F400
1
Front casing
1
GFRPP
CFRETFE
2
Mouth ring
1
Filler charged fluororesin
PTFE/SiC
3
Impeller
1
GFRPP
CFRETFE
4
O-ring*
1
FKM / EPDM
JIS B 2401 G135
5
Bearing
CV, CF
1
HD Carbon
RV, RF
Filler charged fluororesin
PTFE
KK
----
SiC
6
Magnet capsule
1
Ferrite + polypropylene
Ferrite + CFRETFE
7
Spindle
1
Alumina ceramic 99.5%
Alumina ceramic or SiC
8
Rear thrust
1
CFRPPS
CFRETFE
9
Rear casing
1
GFRPP
CFRETFE
10
Drive magnet unit
1
Ferrite + FCD450
11
Motor
1
1 or 1.5 HP
12
Base
1
GFRPP
GFRPP
13
Motor adapter
1
FC200
14
Hex bolt
4
Steel
M8 x20 w/PW, SW
15
Hex head bolt
4
SS
M8 x 30 w/SW
16
Hex head bolt
2
SS
M8 x 40 w/PW, SW
18
Flange kit
2
GFRPP
CFRETFE
19
Liner ring
1
Alumina ceramic 99.5%
Alumina ceramic or SiC
21
Hex head screw
2
Steel M8 x 10

6
MX-(F)402(H), MX-(F)403(H)
*Additional o-ring materials available upon request.
11 12
15
16
14 21 13 10 87 5 6 9
4
19
17
2
3
1
No.
Name
Qty
MX-402(H), 403(H)
MX-F402, F403
1
Front casing
1
GFRPP
CFRETFE
2
Mouth ring
1
Filler charge fluororesin
PTFE or SiC
3
Impeller
1
GFRPP
CFRETFE
4
O-ring*
1
FKM / EPDM
JIS B 2401 G195
5
Bearing
CV, CF
1
Carbon
HD Carbon
RV, RF
Filler charge fluororesin
PTFE
AV, KK
Alumina ceramic
SiC
6
Magnet capsule
1
Ferrite mag. + polypropylene
Ferrite mag. + CFRETFE
7
Spindle
1
Alumina ceramic 99.5%
Alumina ceramic or SiC
8
Rear thrust
1
CFRPEEK
CFRPFA
9
Rear casing
1
GFRPP
CFRETFE
10
Drive magnet unit
1
Ferrite mag. + aluminum alloy
11
Motor
1
2 + 3 HP
12
Base
1
GFRPP
13
Motor adapter
1
FC200
14
Hex head bolt
4
Steel M8 x 20 w/PW, SW
15
Hex head bolt
7
SS M10 x 55 w/ SW
16
Hex head bolt
1
SS M10 x 60 w/PW, SW
17
Lock pin
2
CFRPPS
CFRETFE
18
Flange kit, discharge
2
GFRPP
CFRETFE
19
Liner ring
1
Alumina ceramic 99.5%
Alumina ceramic or SiC
20
Motor bolt
4
SS 3/8 x 3/4”
21
Hex head screw
2
Steel M8 x 10
22
Flange kit, suction
1
GFRPP
CFRETFE

7
MX-505
No.
Name
Qty
MX-505
1
Front casing
1
GFRPP
2
Rear casing
1
GFRPP
3
Impeller
1
GFRPP
4
Drive magnet unit
1
Rare earth magnet +FCD450
8
Magnet capsule
1
Rare earth magnet +PP
9
Hex socket set screw
2
Steel M8 x 10
10
Hex head bolt
4
Stainless Steel M12 x 35, SW
11
Hex socket head bolt
6
Stainless Steel M10 x 45, PW, SW
12
Hex socket head bolt
2
Stainless Steel M10 x 75, PW, SW
13.1
Flange IN Inner
1
GFRPP
13.2
Flange IN Outer
1
GFRPP
14.1
Flange Out Inner
1
GFRPP
14.2
Flange Out Outer
1
GFRPP
15
Motor
1
17
Adapter
1
FC200
CV/CE
RV/RE
18
Liner ring
1
Alumina Ceramic 99.5%
19
Rear thrust
1
CFRPEEK
20
Spindle
1
Alumina Ceramic 99.5%
21
Bearing
1
Carbon
PTFE
22
Mouth ring
1
PTFE
23
O Ring
1
V:FKM E:EPDM JIS B 2401 G230
24
O Ring
1
V:FKM E:EPDM JIS B 2401 G70
25
O Ring
1
V:FKM E:EPDM JIS B 2401 G55
27
Lock Pin
2
GFRPPS

8
4 Handling
Precautions on handling
1. Precautions when pump is started or stopped
When discharge line is long and to avoid water hammer, pay attention to the following:
a. When pump is started
After priming, close the discharge valve before power is switched on. After the
pump is started, gradually open the discharge valve to get the desired duty
point.
b. When pump is stopped
Gradually close the discharge valve and switch off the power. Never close the
discharge line suddenly with a solenoid valve. Sudden close of discharge line
causes water hammer resulting in pump damage.
2. Do not install or store pump in the following places.
Where the temperature falls below 0 deg. C.
Where there is corrosive or explosive gas.
Where water is splashed (except the pump equipped with weather-proof motor)
Where ambient temperature exceeds 40 deg. C.
Where humidity exceeds 85% (Allowable humidity: 35 to 85%RH)
3. Prime pump
The pump is not self-priming. Before the pump is started, prime the pump with pumped liquid.
Dry running causes seizure and quick wear of parts.
CAUTION
Do not run pump dry
When the pump is operated for the first time after it was installed or after it was disassembled and
repaired, fill the pump chamber with the liquid to be pumped. If the pump runs dry without any liquid,
rubbing parts of pump will seize. The moving or rotating parts of MX pumps are lubricated and
cooled by the pumped liquid. The pump will be damaged if run dry or with the suction side valve
fully closed. If the pump runs dry by mistake, switch off the power and leave it for more than one
hour to cool it down slowly.
Keep pump away from fire
To prevent fire and explosions, do not place dangerous or inflammable substances near to pump.
No remodeling
Remodeling the pump can cause risk of injury or electrical shock.
!

9
4. Pump allowable pressure
Pump allowable pressure is shown below. Do not allow discharge pressure to exceed the
allowable pressure.
Model MX-
(F)250
(F)251
(F)400
(F)401
(F)402, 403
402H,
403H
505
Max. allowable pressure PSI
(MPa)
36.3
(0.25)
47.9
(0.33)
31.9
(0.22)
40.6
(0.28)
62.4
(0.43)
72.5
(0.5)
47.9
(0.33)
5. Liquids to be transferred
a. Liquid containing slurry
Slurry cannot be handled except for type A or KK (with alumina ceramic bearing)
which can handle slurry liquid up to 5% concentration, slurry size of 50 micron m or
below and hardness up to 80Hs. Contact Iwaki America if you wish to handle slurry
liquid.
b. Performance influenced by specific gravity and viscosity of liquid
Liquid which is heavier or more viscous than water influences the shaft power,
discharge capacity and head.
The pump you purchased is made according to the specifications you gave us when
ordered. If you wish to change the conditions, please contact us.
c. Alumina ceramic bearing (types AV, AE) may be worn in a short time depending on
the characteristics of liquid (low viscosity etc.). Please contact Iwaki America if you
have any questions.
d. Influence by temperature
Pump performance is not influenced by the change of liquid temperature; however, the
temperature will affect the viscosity, vapor pressure and chemical corrosion. Refer to
the chemical resistance table for the permissible temperature for specific chemical
liquids.
Temperature of liquid to be handled: 0 –80 deg. C (for water)
Permissible ambient temperature: 0 –40 deg. C
Permissible humidity: 35 –85% RH
6. Intermittent operation
Frequent stopping and starting may cause pump damage. Keep the start/stop frequency to within
six times an hour.
7. Disconnection of magnet coupling
If the magnet coupling is disconnected, stop the pump within a minute. If the pump runs with
the magnet coupling disconnected, the power of coupling will be decreased.

10
8. Use of pump in the range of bell-shaped pump performance curve
For the pump which shows bell-shaped performance curve in a small capacity range (Refer to
standard performance curve of the pump), if this pump is used at the section of the curve that
ascends, the pump may operate unstable and make vibration or noise. To avoid such a surging
operation, pay attention to the following:
Arrange the discharge piping so that air pockets are prevented.
Install the valve near the pump discharge port to adjust discharge capacity.
5 Installation, Piping, and Wiring
Installation Position
1. Install the pump as close to the suction tank as possible (flooded suction). If the suction port of the
pump is positioned higher than the suction tank (suction lift), be sure to arrange a foot valve in the
priming pipe and the suction pipe. The lifting capability depends upon the liquid properties,
temperature, and length of suction piping. For details, consult Iwaki America or your distributor.
2. The pump can be installed indoors or outdoors. However, there should be sufficient space around the
pump to enable efficient and easy maintenance.
WARNING
Switch off power
Be sure someone does not switch power on when the pump is being maintained. Display a sign
near the power supply switch to notify others that the pump is being maintained.
Do not hold plastic parts when transferring pump
When transferring the pump, do not hold plastic parts such as casing, flange or base. Plastic parts
may break and the pump may fall resulting in personal injury. The weight of pump is approx. 20
kg max. Put the pump and motor horizontally with the base downward.
Electrical work
Electrical work should be done by qualified personnel.
!

11
Installation
1. The pump anchoring area must be greater than the area of the pump baseplate. If the anchoring area
is not large enough, the baseplate may be damaged due to the concentration of loads placed on it.
2. Set the pump baseplate on a concrete foundation and fasten the anchor bolts tightly to prevent the
pump from vibrating during operation. A sturdy metal (or reinforced) skid or platform is also an
acceptable mounting surface.
3. When motor vibration occurs during operation (e.g., sympathetic vibration with piping), an
expansion joint should be provided between the pump and the piping before the installation.
Otherwise, pipes and gauges may be damaged.
4. MX series pumps should always be mounted horizontally.
Fig. 3
Base
Anchor bolt
Spacer

12

Suction Piping
1. The suction pipe should employ the flooded suction method if possible. The shortest pipe possible,
with the minimum number of bends, should be designed. Arrange a proper support on the suction
pipe so that the load and the thermal stress of the pipe itself are not applied to the pump.
2. Attach the coupling on the suction pipe carefully, so that no air enters the line. The presence of air
in the suction pipe may prevent priming of the pump.
3. Avoid installations with poor suction conditions (e.g. vacuum in suction tank, large suction head or
long suction piping). NPSHa should always be at least 2 feet greater than NPSHr. For NPSHr
values, refer to the standard performance curve for your pump model or contact Iwaki America or
your distributor.
4. When using a bend on the suction side, install a straight pipe which is more than 20 inches long or
10 times as long as the suction port diameter before the suction port of the pump. Use the largest
possible radius of curvature for the bend.
5. Do not allow any projection where air may be trapped along the suction pipe. The suction pipe
should have an ascending gradient toward the pump.
6. If the diameters of the pump suction port and the suction pipe are different, use an eccentric reducer
pipe. Connect the eccentric reducer pipe such that the upper part of it is level. Never use a suction
pipe with a diameter smaller than that of the suction port.
14
2
7
1
2
12
12
10
11
12
215
15
3
4
6 5
9
2
16
13
17 2
1. Discharge pipe (Use a support to keep
the pump free from the load of the
pipe.)
2. Valve
3. Check valve
4. Pressure gauge
5. Motor
6. Pump
7. Air vent pipe
9. Drain ditch
10. Vacuum gauge
11. Suction pipe (D=diameter of pipe)
(shortest horizontal section with an
ascending gradient toward the pump)
12. Pipe support
13. Suction pipe (D=diameter of pipe)
14. 2D, 500mm or above
15. Expansion joint
16. Piping for flushing (discharge side)
17. Piping for flushing (suction side)
Fig. 4

13
7. When using the flooded suction method, the suction pipe should be given a slight ascending
gradient toward the pump so that no air pocket is created on the suction side.
8. The end of the suction pipe should be located 18 inches or more below the surface of the liquid.
9. A screen should be provided at the inlet of the suction tank to prevent the entrance of foreign
matter into the suction pipe. Foreign matter may cause malfunctioning of the pump. The end of
the suction pipe should be a least 1- 1.5D from the bottom of the suction tank. (D=Diameter of
suction pipe).
10. When employing the suction lift method, install a foot valve on the suction pipe.
11. When using the flooded suction method, it is recommended that a gate valve be installed on the
suction pipe for easier overhaul inspection of the pump. Since this valve is used only in the
overhaul inspection of the pump, keep it fully opened during normal pump operation.
UNACCEPTABLE CONDITIONS
AIR TRAP
AIR TRAP
AIR TRAP
AIR TRAP
GOOD CONDITIONS
Fig. 5

14
12. Pay close attention to the lowest level of the liquid in the suction tank so that air entrainment to
the suction piping will not occur.
The inflow pipe into the suction tank should be distanced from the suction pipe and positioned
below the liquid surface as a means of preventing air entrainment to the suction pipe. If air
bubbles are generated in the suction tank, install a baffle.
13. It is recommended that a vacuum/pressure gauge be installed on the suction piping approximately 6
pipe diameters from the pump suction port.
Discharge Piping
1. Use proper pipe supports so that the weight of the piping does not load the pump nozzle.
2. If a method other than flooded suction is used, install a special pipe for priming.
3. If the piping is very long, its diameter should be determined by calculating the piping resistance.
Otherwise, the specified performance may not be obtained due to increased piping resistance.
4. A check valve should be installed if any of the following conditions exists in the piping:
• The discharge piping is very long.
• The discharge head is 50 feet or more.
• The end of the discharge pipe is located 30 feet higher than the surface of the suction tank.
• Several pumps are connected in parallel with the same piping.
5. The installation of a gate valve on the discharge pipe is recommended for the adjustment of discharge
quantity and for the prevention of motor overload. When installing both a check valve and a gate
valve, the check valve should be positioned between the pump and the gate valve.
6. A pressure gauge must be installed on the discharge piping.
7. An air bleeding valve should be installed if the discharge pipe is very long in the horizontal direction.
8. A drain valve should be installed for the drainage of liquid if there is a chance that the liquid in the
discharge pipe will freeze.

15
Wiring
Use appropriate wiring materials, follow the instruction manual for
the motor and abide by the local and national electrical codes. In
addition, follow the instructions given below:
1. Use a motor contactor that conforms to the specifications
(voltage, current, etc.) of the pump motor.
2. If the pump is installed outdoors, use waterproof wiring to
protect the switches from rainwater and moisture.
3. The motor contactor and push button should be installed a
reasonable distance from the pump.
4. Refer to the wiring example shown on the left. (This
example does not include the installation of a dry-
operation prevention device. Follow the instruction
manual of the dry-operation prevention device when
installing it.)
6 Operation
Notes on Operation
1. Never operate the pump with the suction-side valve (gate valve) closed. Otherwise, the internal
bushings of the pump will be damaged.
2. In the event of cavitation, stop the pump immediately.
3. If the magnet coupling disconnects, stop the pump immediately. The torque rating of the magnet
coupling will be reduced if operation is continued with the coupling disconnected.
4. Liquid temperature fluctuation should not exceed 176o F when starting, stopping, and operating the
pump.
5. Be sure to close the discharge valve completely before starting operation in order to prevent water
hammer upon start-up.
6. The pump should never be operated for a lengthy period with the discharge valve closed. A resulting
rise in temperature of liquid in the pump may cause damage to the pump.
7. In the event of a service power failure, turn off the power switch immediately and close the
discharge valve.
M Motor
MC Motor contactor
ON Push Button
OFF
CLR Overload relay
Fig. 6

16
Start-Up Preparation
When operating the pump for the first time after installation, and when restarting operation after a long
interval, prepare for operation as described below.
1. Thoroughly clean the inside of the piping and pump.
2. Tighten the union fittings or flange connecting bolts and baseplate installation bolts. Check the bolts
which couple the front casing and the bracket together are securely fastened.
3. Close the cocks of any pressure or vacuum gauges to prevent damage from sudden pressure changes.
Open only when taking measurements.
4. Fully open the suction gate valve and partly open the discharge valve. Discharge valve may be
adjusted after completion of priming and start-up process.
5. Use a screwdriver to rotate the motor fan and check that the fan rotates smoothly. This also purges
any residual air from in and around the impeller.
6. If using flooded suction, measure the pressure in the suction pipe to check that the pump is filled with
liquid.
7. Run the motor momentarily to check the direction of motor rotation. The motor should run in the
direction indicated by the arrow sealed on the pump. If the direction is reversed, exchange two wires
of the three-phase power wires.
Note: All Iwaki America MX-(F) series pumps spin counter-clockwise when looking at the suction
port of the pump. Naturally, from the motor fan side, this would be viewed as clockwise.
Starting Operation
Pump operation is detailed below.
Check/Operation Step
Remarks
1. Verify valve position.
Suction valve fully open.
Discharge valve fully closed.
2. Check that the pump is filled with liquid.
If pump is not filled with liquid, fill it in accordance with
steps 5-6 of 'Start-up Preparation'.
3. Turn ON motor switch momentarily and check for
correct direction of pump operation.
See the arrow on the casing to confirm the direction of
rotation (clockwise when viewed from the motor fan side).

17
Check/Operation Step
Remarks
4. Flow rate adjustment.
Once total discharge pressure is increased to shut off
pressure. Open discharge valve gradually to set
discharge pressure to desired specification.
Open valve slowly, paying attention to the motor amp meter
to prevent it from being overloaded through excessive
opening of the valve.
Pump should be operated at a minimum flowrate:
250,251,400,401: 2.5 Gal/min (10 L/min) or more
402H, 403H: 5 Gal/min (20 L/min) or more
402, 403: 10 Gal/min (40 L/min) or more
505: 13 Gal/min (50 L/min) or more
In case of automatic control, close discharge valve when starting pump and gradually open the discharge valve thereafter.
Don’t operate the pump with the discharge valve closed for more than one minute.
5. Points to be observed during operation. If pump enters
continuous operation check flow meter and confirm that
pump operation meets specifications.
If flowmeter is unavailable, check values of discharge
pressure, suction pressure and current in relation to piping
resistance.
Stopping Operation
Check/Operation Step
Remarks
1. Close discharge valve gradually.
Caution Do not cause sudden closure by using
solenoid valve, etc. Otherwise, pump may be
damaged by water hammer.
2. Stop motor.
Observe that the motor stops rotating slowly and smoothly.
If not, check inside of pump.
3. Points to be observed when stopping pump.
If pump operation is stopped in cold weather, liquid inside the pump cavity may freeze and damage the pump. Be
sure to drain liquid completely. In case of short-term shut down, which does not allow removal of liquid, use band
heater, etc., to prevent liquid from freezing.
In case of service power failure turn OFF power switch and close discharge valve.
!

18
7 Maintenance and Inspection
Daily Inspection
1. Check that the pump operates smoothly, without generating abnormal sounds or vibration.
2. Check the level of the liquid in the suction tank, and the suction pressure.
3. Compare the discharge pressure and current measured during operation with the specifications
indicated on the motor and pump nameplates to verify normal pump load.
* Note that the indicated value of the pressure gauge varies in proportion to the specific gravity of
the liquid.
Caution: The valve of the pressure gauge or vacuum gauge should be opened only when
measurements are recorded. It must be closed after completion of each measurement. If the valve
remains open during operation, the gauge mechanism may be affected by abnormal pressure
caused by water hammer.
4. If a spare pump is included in the installation, keep it ready for use by operating it from time to time.
Periodic Inspection
To ensure efficient, smooth operation of the pump, carry out periodic inspection by following the
procedure described below. When carrying out an overhaul inspection, handle the internal bushings and
plastic components most carefully. Since the outer drive magnet and inner magnet capsule are very
powerful, handle these components with caution. Take care not to trap hands and fingers between the
magnets and metal objects. Also avoid positioning the magnets near any electronic device (or ATM
cards with magnetic strips) that could be affected by a strong magnetic field.
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