Teral LPS User manual

Coolant Pump
Model: LPS
Instruction Manual
Do not operate, service or inspect this pump until you have
read and understood this manual.
Keep this manual in a safe place where it can be consulted at
any time.
To: All mechanical Contractor
Make sure to supply copies of this manual to the customer’s
operator maintenance and inspection personnel.
TERAL INC.

I
Limit of Liability
1. Warranty period is for period of 18 months after date of the bill of lading or 12 months after installation
whichever earlier.
2. During warranty period, equipment sold is warranted to the Buyer to be free from defective material
and workmanship. If Buyer notifies Seller in writing of any claimed defect in the equipment and if,
after appropriate reasonable opportunity to inspect and remedy any defect by Seller, the equipment is
found not be in conformity with this warranty, the Seller will, at its option and expenses either repair
the same or provided a replacement of defective parts, on condition of F.O.B. Japan.
3. The warranties set forth herein are exclusive and in lieu of all the warranties, express or implied by
law or trade usage.
Seller shall not be liable for any special, indirect, or consequential damages, including but not limited
to loss of use for lost of anticipated profits, arising out of this contract or a breach thereof. Seller
does not warrant any auxiliary equipment.
4. The foregoing warranty does not cover, and the Seller makes no warranty with respect to:
(1) Defect is caused by other equipment which not supplied by Seller or use of improper parts not
specified by Seller.
(2) Failures not reported the Seller within the warranty period above specified.
(3) Force Majeure:
The Seller shall not be liable in any manner for failures, damages, directly or indirectly owing to
any causes or circumstances beyond Seller’s control, including Acts of God, Governmental
orders or restriction, war, war like conditions, hostilities, sanctions, riot, looting, strike, lockout,
plague or other epidemics, fire and flood.
(4) Failures or damages due to negligence, accident, abuse, improper operation or maintenance or
abnormal conditions of temperature, moisture, dirt, or corrosion, and repaired works by others
without Seller’s consent.
(5) Improper storage before installation.
(6) The cost of dismantling and installation of the equipment.
(7) Dispatching an engineer for repair.

II
Purpose of this Manual
The purpose of this manual is to provide the detailed information that the user needs to know in
order to correctly operate, service and inspect the Coolant Pump.
This manual is intended for persons experienced in the operation of coolant pumps, or for persons
who have received instruction from such experienced persons.
Wiring and electrical work must be performed by qualified persons only.
CONTENTS
Limit of Liability ･･･････････････････････････････････････････････････････････････ I
Purpose of this Manual ･･･････････････････････････････････････････････････････ II
1. Safety
1.1 Warnings ･･･････････････････････････････････････････････････････････････ 1-1
1.2 Safety instructions･･･････････････････････････････････････････････････････ 1-1
1.2.1 Safety instructions for operation ･････････････････････････････････････････ 1-1
1.2.2 Safety instruction for installation, maintenance and inspection ･･･････････････ 1-2
2. Structure and overview of the pump
2.1 Names of functions of parts･･･････････････････････････････････････････････ 2-1
2.2 Specifications ･･････････････････････････････････････････････････････････ 2-1
3. Installation
3.1 Delivery checks･････････････････････････････････････････････････････････ 3-1
3.2 Cautions for installation ･･････････････････････････････････････････････････ 3-1
3.3 Cautions for piping work ････････････････････････････････････････････････ 3-1
3.4 Instructions for wiring work ･･････････････････････････････････････････････ 3-2
4. Preparation for operation
4.1 Checks prior to test operation･････････････････････････････････････････････ 4-1
4.1.1 Electrical system checks ･･････････････････････････････････････････････ 4-1
4.1.2 Pump system checks ･････････････････････････････････････････････････ 4-1
4.2 Test operation ･･････････････････････････････････････････････････････････ 4-1
4.3 Precautions in operation ･････････････････････････････････････････････････ 4-2
5. Maintenance and inspection
5.1 Cautions for maintenance and inspection ･･････････････････････････････････ 5-1
5.2 Inspect and clean of the drain port ･････････････････････････････････････ 5-1
5.3 Replace the V-ring(Only LPS65) ･･･････････････････････････････････････ 5-2
5.3 Periodic inspection table ･････････････････････････････････････････････････ 5-3
6. Troubleshooting
6.1 Causes and action ････････････････････････････････････････････････････ 6-1
6.2 Causes and structure･････････････････････････････････････････････････････ 6-2

1-1
1. Safety
1.1 Warnings
The warnings used in this manual are graded into 4 types, according to the degree of danger (or
seriousness of potential accident) that they signify.
Be sure to know the degree of danger signified by the various types of warning, and follow all the
instructions that they give.
Grade Meaning
Imminent danger. Failure to follow the instructions given will
result in death or serious injury.
Potential danger. Failure to follow the instructions given could
result in death or serious injury.
Potential danger. Failure to follow the instructions given could
result in medium or light injury, or in damage to the equipment.
Draws attention to or stresses important information.
1.2 Safety instructions
1.2.1 Safety instructions for operation
(1) Before turning on the power, always fit the cover over the motor terminal box.
There are parts inside the box that are electrified at 200V and may cause an electric shock.
(2) Do not allow water to get onto or into the motor. Otherwise, it could cause short circuits or
break insulation, which could result in damage to the machine.
(3) Before operating the pump, inform all the personnel concerned, and make sure that
nobody is in a dangerous place.
(4) While the pump is in operation, do not touch unnecessary parts.
(5) The motor can be hot. Do not touch it.
(6) Operate the controls CAREFULLY. Do not use force. Operating the controls forcibly may
result in damage, malfunction or breakdown.
(7) The pump should only be operated by persons who have been authorized to do so by the
director of the workplace.
(8) Do not run the pump with tools or other objects placed on top of it.
(9) If any of the pump’s components are defective or not functioning, do not operate the pump.
(10) Do not put fingers or objects into the motor’s openings. If you do, you could get an electric
shock.

1-2
1.2.2 Safety instructions for installation, maintenance and inspection
(1) Installation, maintenance and inspection of the pump should be performed by personnel who
have been trained in its operation and use. Electrical wiring work should be performed only by
suitably qualified personnel or electricians.
(2) Be sure to make an auxiliary pump readily available if the pump is used for key facilities in
which disruption of water supply may cause a serious problem.
(3) Before carrying out maintenance or inspection of the pump, be sure to inform all relevant
personnel.
(4) Before carrying out maintenance or inspection of the pump, stop the pump and turn off the
main power supply to the operation panel.
If carrying out the work with the power turned on, there is danger of electric shock,
and the pump could start up suddenly, causing injury.
Be sure to install an electrical leakage breaker on the power supply side.
(5) Do no allow water to get onto or into the motor. Otherwise, it could cause short circuits or
break insulation, which could result in damage to the machine.
(6) After the power is turned on, do not touch the parts unnecessary for operation.
Touching the electrical circuit may cause an electric shock and is especially dangerous.
Be sure to fit the cover over the motor terminal box.

2-1
2. Structure and overview of the pump
2.1 Names and functions of parts
① Motor
② Discharge port
③ Suction port
④ Priming port
Priming liquid enters the pump through this port.
⑤ Drain port(32A)
Liquid that leaks from the shaft seal is drained
out through this port.
⑥ Spare drain port 25A(On the opposite side of the
terminal box)(LPS40)
Spare drain port 25A is that the remodeled pump
can be used to replace the conventional pump. A
blind plug is plugged into the spare drain port
before shipping.
⑦ Detection hole for leakage (LPS40)
Liquid leakage from this hole alert some problem
around drain port. Inspect around drain port
when leakage of liquid from this hole is found.
⑧ Siphon prevention hole
This hole has a function to prevent the siphon effect inside the pump caused by falling
liquid when the pump is stopped, and to retain the necessary liquid inside the pump
while it is not running.
⑨ Cleaning port
This port is used for inspecting and cleaning the siphon prevention hole without
disassembling the pump.
2.2 Specifications
The specifications of the standard pump are given in the table below. If optional or
special specifications have been ordered, details of them will be found in the outer
dimension drawings and other specification documents.
Do not use the pump in conditions outside of its specification
operating condition ranges.If the pump is used outside these ranges,
electric shock, fire, liquid leakage or breakdown could occur.
Qualities
※1 LPS40: Water-soluble/water-insoluble coolant fluid,
water containing additives (anti-rust agents) and the like,
and liquids of similar viscosity.
(32 cst in the case of type LPS40C, 150 cst in the case of type
LPS40D)
LPS65: Water-soluble coolant fluid
Pumped
medium
Temperature 0 to 60℃
Installation location Indoors (ambient temperature 0 - 40℃)
Type Totally enclosed fan-cooled type
Power supply 50 Hz: 3 phase 200V, 60 Hz: 3 phase 200/220V
Ins. class LPS40 (0.75kW, 3.0kW): Class E
LPS65, LPS40 (1.5kW, 2.2kW): Class B
Motor
Poles 2 poles
※1 Liquid quality: Contact us in the case the liquid to be pumped contains hard solid substances or
a large amount of foreign substances (including cut powder).

3-1
3. Installation
3.1 Delivery checks
When your coolant pump is delivered, check the following:
Contact to your dealer if any defect.
(1) Are all descriptions on nameplate as ordered?
(2) Has no damage occurred during transportation?
(3) Are the nuts and bolts (or other parts that should
be tight) tight?
(4) Have all the accessories that were ordered been
delivered?
3.2 Cautions for installation
(1) Install the pump in a place that satisfies the following conditions:
・A place sheltered from wind and rain.
This pump is for indoors use.
・A well-ventilated place, with little humidity or dust in the air.
・A place with ambient temperature in the range 0 – 40°C.
・A place where unauthorized persons cannot enter
or can not operate the pump．
・A place where a possible water leak should not create a
secondary hazard.
(2) Install the pump with its shaft perfectly vertical.
(3) To lift the pump, lift the pump with using eyebolt.
(4) Install the pump on top of tank or at side of pump. The pump should be mounted on the
base which is strong enough to withstand sufficiently the pump’s operating load.
NOTE
Install the pump so as to keep its suction
port higher than liquid level always in the
tank.
The clearance between the pump suction
port and the tank bottom should be at least
25mm.
3.3 Cautions for piping work
(1) Make piping connections thoroughly secure, so that liquid will not leak from them.
(2) Provide supports for the pipes (pipe support table), so that their weight is not imposed on the
pump body.
(3) Be sure to connect up piping from the pump’s drain port to the tank.
(The standard drain piping size is 32A. In case of replacement with old model, drain port for 25A
pipng is also available.)
Before unpacking, make sure that the
pump is the right side up.
Especially if packing is wooden crate,
beware of nails that could hurt your body.
Before lifting the pump, check its weight
(given in catalog and outer dimension
drawings), and make sure that the
weight of the pump does not exceed the
rated load of the ropes and lifting
equipment.
Do not put a protecting cover or a filter
on the motor, or it may increase the
temperature inside the motor and lead to
unforeseen machine trouble.

3-2
Electrical wiring
RST: Power
su
pp
l
y
terminal
(4) How to lay out drain pipe (Only for Model LPS40)
The pump has two drain ports: 32A port and 25A sparer ports. It is recommended to
use a 32A drain port rather than a 25A port to ensure enough drain capability.
・When attaching the drain port 32A.
Install a piping (32A) to return the liquid to the tank.
Do not reduce the drain pipe size from 32A to 25A using a reducer.
It may cause the accumulation of foreign substances around the
reducer, followed by the clogging of the drain. The 25A spare port
should better be used in such a case.
・When attaching the spare drain port 25A.
Remove the blind plug 25A and attach the pipe 25A for a return. Plug the 32A drain
port with a blind plug.
・When changed position of drain port
The suction spacer can be rotated 180 degrees.
Do not rotate the spacer 90 degrees, because it may cause
clogging of the drain port.
(5) For the suction line, use the pipe of the diameter identical to the pump size. The length
from the liquid level to the suction port should be not more than 700mm, and the pipe
should be as straight as possible.
3.4 Instructions for wiring work
Use good quality wiring equipment for wiring.
Wire the unit safety, in accordance with technical standards for local
regulations. The unit must be wired by a qualified electrician or other
suitably qualified person. It is illegal, and very dangerous,
for unqualified people to perform wiring work.
Make sure to tighten the electric power terminals securely. Loose terminals may
cause an open phase fault, which causes burning of the motor.
(1) Provide an electrical leakage breaker and overload protection device for the pump’s main
power supply cable.
(2) Be sure to install a ground cable, to prevent electric shock.
Connect the ground cable to the ground terminal inside the
motor terminal box.
(3) Fix the main power supply cable to the motor terminal box with cable locks, so that the cable
will not exert tension load on the terminal board.
Connecting the ground cable to city gas or water
pipes is illegal, and extremely dangerous.
Do not alter the direction of the terminal box.
If the direction is altered, liquid may enter the box,
resulting in electric shock.

4-1
(4) Install the main power supply cable through a metal pipe or metal duct to shield it, and ground
the outer surface of the pipe/duct.
(5) Control the fluctuation of the power supply voltage within ±10% of the rated voltage and the
frequency within +3 to -5% of the rated frequency. The pump can run while the power is
controlled within this range, but DO NOT run it for a long period if the power is higher/lower
than 5% of rated voltage or higher/lower than 2% of the rated frequency. And even if the
supplied power falls within the allowable range, the pump characteristics, motor characteristics,
and the temperature rise of the motor may differ from those shown at the power of rated
voltage and frequency.
(6) Cautions for inverter driven operation
• The operating current must not exceed 90% of the rated current.
• The operating frequency should be at least 20Hz.
• Do not use an inverter to drive a motor when using a 400V class motor.
• An inverter-driven motor can generate a magnetic sound and thus make a more
unpleasant sound than those driven by commercial power supply.
Although this magnetic sound does not cause an adverse effect on the quality of the
motor, some inverters allow the user to adjust the tone by changing the carrier
frequency. However, changing it may reduce the allowable output of the inverter.
Pay particular attention when selecting the inverter.
4. Preparation for operation
4.1 Checks prior to test operation
4.1.1 Electrical system checks
(1) Check that the wiring has been connected correctly.
(2) Check that terminal connections are secured.
(3) Check that grounding has been carried out properly.
(4) Check that the setting on the overload protection device is the motor’s rated current.
(The device should include the rated current of pump around the middle of its setting range.)
4.1.2 Pump system checks
(1) Check that the level of liquid in the tank is above the lowest liquid level.
(2) Turn the pump by hand, and check that it rotates easily. To turn the pump by hand:
Remove the end cap from the motor shift, Insert a screwdriver into the groove on the end of the
shaft, and turn it.
ALWAYS turn off the main power supply before turning the pump by hand.
(3) Supply priming liquid to the pump from the priming port. When priming is complete, retighten
the plug of the priming port.
4.2 Test operation
Be sure to fit the cover over the motor terminal box.
There is danger of electric shock.
(1) Turn the power switch on and off 1 or 2 times, and check that the pump rotates in the correct
direction. For direct operation model, turn ON in the order of No.1 pump and No.2 pump or
both pumps simultaneously, and turn OFF in the order of No.2 and No.1 or both
simultaneously.The correct direction is clockwise, viewed from the motor end of the pump.
If the pump rotates in the reverse direction, change 2 of the main power cable’s 3 wires.
Do not run the pump in the reverse direction, or it could cause breakdown.
(2) Turn on the power switch, and run the pump.
(3) The normal suction time is about 3 sec. at the maximum (when viscosity is 32cSt).

4-2
If the suction takes too much time, that may be caused by insufficient amount of
priming liquid or by clogging of the siphon prevention hole. Repeat the priming to
obtain the sufficient amount of liquid or clean the siphon prevention hole.
(4) Gradually open the sluice valve on the discharge side, until the specified discharge pressure is
reached.
Do not run the pump at shut-off pressure for longer than 5 minutes. If you do, the water
inside the pump will heat up, resulting in accident or trouble.
(5) Check for abnormal pressure, current, noise or vibration.
Keep the cocks of the pressure gauge, compound gauge and other instruments closed at
all times, expect when they are being used for gauging. If these cocks are left open,
breakdown may occur.
4.3 Precautions in operation
(1) Limit of start/stop operation count
Minimize the number of startups and shutdowns of the pump, or it may lead to premature
damage to the pump. Do not start the pump more than ten times an hour or so.
(2) Prohibition of over current
Do not drive exceeding the motor’s current. It may cause the motor burnout.
(3) Prohibition of restart before complete stop
Do not restart the pump before it completely stops. Turning ON the power while the pump
is rotating causes excessive torque on the pump, which may damage it.
(4) Prohibition of shut-off operation for a long period
Do not run the pump at shut-off pressure for longer than 5 minutes. If the pump is run at
shut-off pressure, the liquid inside the pump will be heated up, resulting in accident or
trouble.
(5) Prohibition of operation with air
Do not perform operation with air, for it causes the burning of liner ring or shaft
penetration part. After the pump installation, discharge air from the air purge plug,
and pour the liquid until it reaches over the minimum liquid level in the pump.
(6) Cut powder or abrasive grain
Mixing the cut powder or abrasive grain into the pump may cause the powder clog of
the pump strainer as well as the clog of impeller, leading to a poor discharging
performance. All the coolant pump should be used after the preliminary treatment, in
which the sample is filtered through the filtering basket, chip conveyor, and magnet
separator. A fine cut powder or abrasive grain that can penetrate the pump strainer
can deteriorate the pump performance, causing to damage the pump.
When the liquid contains a large amount of fine cut powder or abrasive grain, it
may cause the overload, damage, or performance degradation of the pump. The
inside of the pump (mainly the rotating parts and around the drain port) should be
periodically inspected and cleaned.

5-1
5. Maintenance and inspection
Before inspecting the pump, always shut off its main power
supply. Otherwise the pump could suddenly start up in auto
operation, exposing personnel to great danger.
5.1 Cautions for maintenance and inspection
(1) If pump discharge pressure, current, noise or vibration is markedly different from normal, it
means that breakdown is probably going to occur. In such a case, refer “5.4 Periodic
Inspection Table” below, and take prompt corrective action.
(2) If the bearing temperature gets too high, immediately stop the pump and inspect the bearing. When
the difference between the bearing surface temperature and ambient temperature is 40°C or less, the
bearing temperature is normal.
(3) Clean the inside of the strainer and tank from time to time.
Clogging of the strainer will cause variations in
pressure, reduction in discharge volume and abnormal
noise, and could result in breakdown of the pump.
(4) Inspect and clean after removing the plug.
In case the hole for siphon prevention is clogged, It may cause disabling suction.
(5) Normally, keep the cock of the pressure gauge closed.
Open it only when pressure needs to be gauged.
(6) When power failure, turn off the power supply.
If the power supply is left on, the pump could start up suddenly, which is dangerous.
5.2 Inspect and clean of the drain port(Commonness LPS40/LPS65)
When the drain port is clogged with the accumulation of cut powder, etc., it
may cause damage to the motor. To prevent the damage, inspect and clean
periodically the area around the drain port in the following procedure.
(1) Disassembly procedure（Only LPS40）
1. Open the terminal box of the motor and
disconnect the power cable.
2. Disconnect the discharge pipe and the drain
pipe at each joint from the pump. The suction
pipe does not need to be disconnected.
3. Remove four hex bolts and nuts (M12).
4. Lift up the motor and pump. O-ringcmay fall
during this activity.
5. Tap the suction spacer lightly and evenly with a
plastic hammer to remove it from the pump.
6. Remove the O-ringd.
(2) Clean of the drain port
1. Remove the cut powder, etc. accumulated
around the drain port and inside the suction
spacer. Then clean them up.
2. Remove cut powder, etc. adhering to the
surface where the O-ringccontacts, and clean it up.
Cleaning aroun
d
the drain
p
ort
.
Cleaning aroun
d
the drain
p
ort
.

5-2
(3) Assembly procedure（Only LPS40）
1. Install a new O-ringd, and then tap the suction spacer lightly and evenly with a
plastic hammer to install it onto the pump. At this time, if necessary, apply lubricant
on the O-ring surface so that the suction spacer will smoothly slide and fit in.
2. nstall a new O-ringc, and mount the pump onto the suction pipe. Fit the O-ring c
properly into its groove. Then, reassemble the pump in the reverse order of the
disassembly procedure described above.
5.3 Replace the V-ring(Only LPS65)
The V-ring, which is made of rubber, rotates with friction against the steel
plate in a high speed, which provides a sealing function. When the pumped
liquid contains a large amount of cut powder, etc., the service life of the
V-ring can be shortened. Change the V-ring periodically in the following
procedure.
(1) Disassembly procedure
1. Remove the coupling cover.
2. Remove the coupling bolts (hex socket bolts) and dismount the coupling.
Remove the knock pin too when dismounting the coupling.
3. Remove the motor mounting bolts connecting the discharge casing and the motor,
and dismount the motor.
4. Remove the cross-recessed-head machine screws and remove the baffle plate.
5. Remove the O-rings and V-ring.
Fitting plate
(Thickness 5mm)
①Coupling cover
③Knock-Pin
④bolt for Motor
②Coupling
⑤Cross recessed head screw
⑥Baffle plate
⑦O-ring
⑧V-ring
(2) Assembly procedure
1. Replace both the O-rings and the V-ring with new ones.
Push the V-ring securely into the deflector.
2. After the replacement is completed, reassemble the baffle plate (new one) and
cross-recessed- head screws in the reverse order of the disassembly procedure.
Apply grease on the sliding part of the baffle plate when installing it (for lubrication of
the V-ring).
3. Mount the motor onto the discharge casing and fasten it with the bolts.

5-3
4. Mount the coupling.
When mounting the coupling, insert the knock-pin into the main shaft and hold it with
the coupling.
The coupling bolts and nuts should be temporarily fastened at this point.
5. Lift up the main shaft and insert the fitting plate between the bottom of the coupling
and the baffle plate.
Turn the coupling by hand and check if it turns freely without partial contact.
If it does not turn smoothly, repeat the disassembly and reassembly
procedures.
6. Tighten the coupling bolts in such a manner that clearance on both sides of the
coupling will be nearly equal. Fasten the bolts using a torque wrench with a tightening
torque of 40 to 45Nm. Be careful as insufficient tightening torque may lead to damage
of the pump.
7. Remove the fitting plate.
8. Turn the coupling by hand to check if it turns freely without partial contact. If it does
not, repeat the disassembly and reassembly procedures.
9. Install the coupling cover.
5.4 Periodic inspection table
Replacement of parts or repair should be performed by personnel from a specialist
company or by a service agent approved by the manufacturer. Incorrect replacement
or repair can cause breakdown or malfunction.
Inspection interval Consumable
Ite
m
Part for
inspection/
adjustment
What to
inspect Method Criterion
Daily 1
month 6 months 1 year Item Quantity When to replace
Temperature Measure
0 – 40°C ○
Humidity Measure
Max. relative humidity
85% ○
Ambient
conditions
Dust, etc.
Conditions
within
spec.
ranges Observe
visually Should be no dust ○
Voltage Should be rated voltage
○
Voltage
variation Measure Should be in allowable
variation range
○
Power
Power supply
terminal
board Screws
loose Tighten Should be no
looseness
○
Clogging Disassemble
and inspect Should be no clogging
○
Impellers Wear Disassemble
and inspect Should be normal
○
siphon
prevention Clogging Disassemble
and inspect Should be no clogging
○
Shaft &
surroundings Rotation smooth Rotate by hand Should rotate easily
○
Detection
hole for
leakage(LPS
40)
Liquid
leakage Observe visually Should be no Liquid leakage ○
Seal
plate(LPS65) Liquid leakage Observe visually Should be no Liquid leakage ○ V ring 1 Every 1 years
Bearings
(Motor) Overheating Feel by hand Heat should be normal
○ Bearin
gs 2 Every
3 years
around drain
port Clogging Disassemble
and inspect Should be no clogging ○
Appearance Abnormal noise &
vibration Listen Should be none ○
Pump & motor
Insulation
resistance
Between
ground
and each
lead wire
Megger
tester Should be at least
1 MΩ ○

6-1
6. Troubleshooting
6.1 Causes and action
If any trouble occurs in the pump, investigate the cause thoroughly. If parts need to be
repaired or replaced, have the repair or replacement performed by a specialist company
or a service agent appointed by the manufacturer.
Fault Causes Action
Disconnected or broken wires Replace or replace
Fuse blown Replace with correct spec. fuse and find
cause
Poor switch contacts Inspect contacts
Voltage drop Contact electric utility company
Motor broken down Have repaired at specialist workshop
Foreign objects caught in impeller Disassemble and repair
Sliding parts (liner rings, bearing metal
parts) seized Disassemble and repair
Motor does not turn
Shaft seal parts rusted up Disassemble and repair
Rotation direction is wrong (reverse) Change round 2 of 3 main power cable
wires
Head is too high Check with pressure gauge
Speed drop Check with tachometer and study
Foreign matter clogging pipes Inspect & clean piping
Pump unit not fully submerged Supply more liquid to tank, or lower
pump position
Impeller not submerged in liquid Temporarily open air purge plug and
expose pump interior to atmosphere
Motor turns,
but no liquid
is pumped
The hole for siphon prevention is clogged Inspect and clean after removing
the plug.
Foreign matter clogging impeller and
casing Disassemble and repair
Impeller is worn Disassemble and repair/replace
Rotation direction is wrong (reverse) Change round 2 of 3 main power cable
wires
Leak in discharge pipe Inspect & repair
Speed drop Check with tachometer and study
Stop valve is blocked Open stop valve
Foreign matter struck in pipes Inspect & clean piping
Liquid is pumped,
but specified pumping
volume and head is not
attained
Pump’s strainer is clogged Inspect & clean strainer
Speed too high Check with tachometer
Specific gravity or vicosity of liquid too
high Re-study pumping plans
Rotating parts in contact Have repaired at specialist workshop
Discharge volume too much Close stop valve
Motor overload
Voltage drop Contact electric utility company
Foreign matter caught in part of impeller
and destroying balance Disassemble and investigate
Installation or foundation fault Inspect and rectify
Bearing or bearing metal damaged Replace
Pump produces
abnormal noise/
vibration Cavitation occurred Consult manufacturer or specialist
Liquid leakage from
detection hole Problem at drain port Clean around drain port

6-2
6.2 Causes and structure
LPS40
Liquid leak from the leakage
detection hole indicates a failure in
the drain line. If this hole is clogged,
it is possible that the inside of the
motor is immersed in the liquid.
Detection hole for leakage
If the siphon prevention hole is
clogged, the liquid is not
retained inside the pump due to
siphon effect when the pump is
stopped, and the suction would
not be performed when the
pump is restarted.
Siphon prevention hole
When the shaft seal (sliding
part) excessively wears, the
amount of leak increases
and the liquid may leak from
the leakage detection hole.
Shaft seal(sliding part)
Oil seal Deflector
Drain port
If the drain port is clogged, the
liquid may leak from the leakage
detection hole.
In case the hole for siphon
prevention is clogged,it may cause
disabling suction. Inspect and clean
the hole after removing the plug.
Cleaning port
LPS65
The deflector, V-ring, and baffle
plate perform as seals to
prevent the liquid from reaching
the outside and the motor when
it is splashed from the shaft
seal. A deteriorated V-ring may
cause the leak from the baffle
plate to outside.
Around the baffle plate Baffle plate
V-ring
Deflector
Discharge port
Sleeve
Shaft seal(sliding part)
When the shaft seal (sliding
part) excessively wears, the
amount of leak increases
and the liquid may leak from
the baffle plate.
Drain port
Cleaning port
Siphon prevention hole
Refer to LPS40(the top figure)
Refer to LPS40(the top figure)
Refer to LPS40(the top figure)

Head Office
230, Moriwake, Miyuki-cho, Fukuyama-city, Hiroshima, 720-0003, Japan
Tel.[phone] Fax.[phone]
www.teral.net
2016 06
TP‑061‑04