Trochoid Pump
Lunary Pump
Instruction Manual

Important
Read this manual thoroughly and carefully before installing or selecting apump.
Follow all instructions carefully to ensure the correct and efficient pumpinstallation and operation.
This manual contains suggestions and instructions on pump selection,
installation, operation, and troubleshooting.
Failure to observe this manual prior to operation may result in personal
injury and/or equipment damage.

Store this manual in a safe and readily accessible
location for future references

T201806EN

Trochoid Pump and Lunary Pump(GPL)Instruction Manual
For Safe Pump Operation
Safety●Safety Equipment ........................................................................................................................ 2●Safety Measures .......................................................................................................................... 2

Pump Installation●Installation .................................................................................................................................... 3●Installation Positions for the Trochoid Pump, Trochoid Pump with Motor, Trochoid
Pump with Motor and Base Coupling, Lunary Pump with Motor and Base Coupling ....... 3●Installation Site ............................................................................................................................ 3

Pipe Arrangement●Pipe Connections ........................................................................................................................ 4●Types of Pipes and Couplings ................................................................................................... 4●Discharge Pipework .................................................................................................................... 6●Filters ............................................................................................................................................ 6

Preparations●Before Operation ......................................................................................................................... 7●Test Run ........................................................................................................................................ 7●Regular Inspections .................................................................................................................... 8

MaintenanceWarranty
Pump Selection●Necessary Flow Rate. .................................................................................................................. 9●Necessary Pressure. ................................................................................................................... 9●Relief Valve Set Pressure............................................................................................................ 9●Applicable Liquids ..................................................................................................................... 10●Ambient Temperature ................................................................................................................ 10●Oil Temperature Range. .............................................................................................................11●Applicable Viscosity Ranges. ....................................................................................................11●Rotation Direction. .................................................................................................................... 12

Motor Selection●Required Power For the Pump. ................................................................................................ 12●Applicable Voltage and Frequency. ......................................................................................... 13●Surroundings of the installation site. ...................................................................................... 13

Pump Drive Method●Attachment Method. .................................................................................................................. 13

Suction Capacities
Troubleshooting Chart

1

For Safe Pump Operation
Be sure to obtain a thorough understanding of all safety measures. Always
conduct the indicated precautionary steps and safety measures. When you see
the following symbols and titles in this manual, be alert to the potential for
personal injury or equipment damage.
Failure to follow the instructions will result in death or serious personal

Danger: injury.
Warning:

Failure to follow the instructions can result in death or personal injury.

Caution:Failure to follow the instructions can result in death or personal injury.

Safety●Safety Equipment
・Be sure to equip motor with an “Earth-Leakage Circuit Breaker (ELCB)” or
overload protection equipment. Use this equipment only after confirming that the
ratings are within the prescribe ratings stated on the motor’s name plate.
・Be sure to comply with local electrical codes and regulations.

Caution:Failure to use “Earth-Leakage Circuit Breakers(ELCB)” andoverload protection equipment could result in damage to theequipment or motor burnout.

・To avoid damage to pump outlet, install a galvanometer, pressure sensor, orsuch other devices in the pump’s outlet line to detect dry running.
・The oil seals and packings cannot be used indefinitely.
・Install the pump in a safe location, or provide an protective cover or device toprevent personal injury or equipment damage caused by an accidental oil leaks.
●Safety Measures
・Keep children or other people incapable of judging risks away from the pumps.
・Protective equipment should be installed to prevent fingers, hands or otherobjects from getting caught in the rotating or moving parts.
Warning:

Getting your fingers, hands or articles caught in the rotating or
moving parts may cause unexpected injury.

・Do not touch a pump or motor during or immediately after the operations.
Warning:

Touching the pump or motor during the operation may result inburns.

・There may be sparks from the centrifugal force switch section when starting up
certain single-phase motors (IME200S, 2ME200S, 2ME400S, 2MY750S).
Danger:Do not place any flammable liquids or materials in the areasurrounding the motor. Such items could catch fire.

2

Pump Installation●Installation
・The pump should be installed at a position that is within 1m above or below theoil surface level.
・It is advisable to mount the pump at a position where the suction port is above
the height of the oil surface level.
・Please consult us if the pump should be used outside the specification range asstated above.

Caution:Installing the pump at a height of more than 1m above the oil
surface could result in poor suction, depending on the operating
conditions.

●Installation Positions for the Trochoid Pump, Trochoid Pump with Motor,
Trochoid Pump with Motor and Base Coupling, and Lunary Pump with
Motor and Base Coupling
・There are no particular restrictions on the mounting directions when installing
only the pump itself.
・When installing a Trochoid pump with a motor, the pump cannot be installed in aposition higher than the motor (as seen from the horizontal position).
・When installing a Trochoid pump with a motor and a base coupling, thefoundation where the base plate will be attached must be level.
・Align the attachment anchor so that it can be smoothly fitted to the base plate
and the motor attachment holes.
Caution:The motor may get damaged if the motor and Trochoid pump are
installed incorrectly.

Caution:If the installation site is not level, or if there is forcible installation inwhich the installation holes are not in exact alignment, the angle
plate or base may get damaged or the axis may be deviated, which
result in pump galling and ruining the pump.

Installation Site
The equipment should not be installed in locations with lots of dust, high or low
temperatures (refer to P.10 "Ambient Temperature"). Please consult us onwhat
measures can be taken when the equipment must be used in special
environments (e.g. a place in which the pump will be exposed to water, placewith high vibration or high humidity) other than the typical indoor installationsites.

3

Pipe Arrangement
・The maximum torque allowances when tightening the screws for the Trochoid
pump's pipe connections are as shown in the table below.
Diameter Rc
Torque N・m

1/8
10

1/4
20

3/8
20

1/2
25

3/4
30

1
70

1-1/4
80

1-1/2
90

Caution:The pump bore may get damaged if these values are exceeded.

Caution:The use of seal tape or liquid sealants may result in reduced
frictional resistance and over tightening, which in turn could
damage the pump bore.

●Pipe Connections
・Make sure that the pipe connections are securely tightened and completely
sealed to prevent leaks or intake of air.
・Always be sure to use pipe supports so that the pipes are self-supported and will
not place any weight on the pump.
・Make sure that the pipe lengths and angles are correct when connected so thatno unnecessary strain is placed on the pump.
・A pressure gauge should be installed so that pump conditions can be easily
monitored.
・Stop valves, union jacks and some other couplings should be used to makepump maintenance easier.
・When handling oils with high viscosities, select pipes with diameters bigger thanthe pump to minimize pressure loss.
・Some of the high-pressure hoses and other parts have narrow internal
diameters. Therefore, be sure to check not only the inner diameter of screw-in
sections, but the whole area of the pipe as well before use.
・It is recommended that an air vent valve in discharge line and additional priming
hole in suction line be provided to prevent possible startup troubles.
●Types of Pipes and Couplings
・All pipes must be cleaned thoroughly before connected to the pump. Some
pipes may have dust from storage or threading debris remaining inside. Be sure
to flush out all pipes to ensure that they are thoroughly clean before use.
Caution:The pump and connected equipment may become damaged if thepipes are not adequately clean.

Caution:

Do not attempt to flush the pipes after attaching to the pump.

Caution:Test the pipes for air tightness before installing the pump.
4

●Pipe Arrangement for Suction Side・For the suction side, select pipes with diameter that will keep the fluid velocity inthe pipe at 1.5m/s or less and suction resistance at -0.03MPa or less.
・Make sure that the total pressure resistance of devices installed on the suction
side of pipes, filter and valves in the pump suction line is smaller than 0.03MPa.
〈Calculation〉

Pump Flow Rate（m3/s）
Pipe Cross-section Area（m2）

Fluid Velocity（m/s）=

Caution:Trapped air or foam inside the pipes may result in pump noise,
vibrations and heating, which in turn could ruin the pump.

・Calculate the suction head based on the minimum oil level.

・Keep the suction-side piping as far away as possible from the return port of therelief valve or actuator so that there will be no negative influence from thereturned oil.

Correct

Wrong・Piping in the suction line should be as short as possible and with minimum
number of bends.
・Inspect all of the valves thoroughly, cocks and couplings before assembling thepipes. Do not use any items with cavities or narrow ports.
・When bending or soldering the pipes, make sure that those pipe bores do not
become smaller.
・Make sure that pipe inside diameter doesn’t change throughout the pipe.
・Make sure that the opening section of the packing is cut away in accurate
diameter and without any burrs.
・Make sure that air doesn’t enter the pipes.
・It is recommended that suction pipes with bore diameter of one or two size larger
be selected to reduce suction resistance if pumping oil with viscosity of ISO VG68
or higher in viscosity.

5Correct
Correct

Wrong
Wrong
Wrong

・Use gate-type valves when installing valves.
・If the pressure still remains inside the pipes in discharge line after the operationis stopped, a non-return valve should not be installed in suction line but indischarge line.

Caution:Make sure that the pressure in suction line won’t exceed
0.03MPa. Excess pressure in suction line may cause oil seal
damage, oil leakage. Special attention will be required
particularly if you use forward and reverse type Trochoid pump.

●Discharge Pipework
・Select pipes which is wide enough to allow the fluids flowing through thedischarge line at a speed of 3m/s or less.
●Filters
・It is recommended to Install suction filter of 150-mesh with as large capacity as
possible if operated in a normal condition.
・Select filters with a passage resistance of 0.01MPa or less after confirming the
manufacturer’s specifications.
・The purpose of installing suction filter is to remove large objects that could
hamper normal pump operations. Even very tiny object passing through the filter
could significantly shorten the pump service life. Therefore, the oil used with thepump will need to be replaced on a regular basis, or cleaned regularly with afilter which is smaller than 11-micron openings.

Caution:Foreign objects mixed in the oil may significantly shorten thepump service life or damage the pump. Very fine objects which
can pass through the suction filter also can cause performancedrop, shortened service life, oil leaks depending on the use
environment. Therefore, the filters need to be cleaned on aregular basis. Continuous use of clogged filters may result in an
abnormal noise, vibrations and poor discharge.

6

Preparations●Before Operation
・Check the direction of the pump rotation, suction port and discharge port.
・The rotation direction for our NOP motors (which is specially customized to work with NOPpump), is indicated on the wiring plates on the motor frame or terminal box section. Make
the necessary connections after first checking these directions. If using our NOP motor

confirm the direction of motor rotation before wiring, which is indicated on thewiring plate attached to the motor frame or terminal box.
1) Our NOP motor (3-phase power source) is designed to rotate in thestandard rotation directions when wired in accordance with the wiring
diagram as shown below.

2) Some types of general-purpose motor (3-phase) equipped with a basecoupling may need to be wired differently from the diagram above, if thatwill be the case, wire the connections in accordance with wiring plates on
the pump.
Caution:Mistakes in the rotation direction and positioning of the suction anddischarge ports could result in oil leaks or damage to the pump.

・Confirm whether the tank on the suction side is filled with clean oil.
・Confirm that there are no loose sections in the piping.
・Confirm that the entire pipe circuit is fully opened.
・Confirm that the valves around the pump are all fully opened.
・On the initial startup, turn the pump on and off quickly for a few times to confirm
that the motor is running in the right direction.
・There is no ON / OFF switch on our pumps. It will start just after the wire isconnected to the power supply. So, make sure that the power is completely
disconnected before performing the wiring.
●Test Run
1) Dry Run
・Do not run the pump dry for more than 10 seconds. Stop the operation if thepump cannot prime oil.
・When it takes long time until the pump starts to draw oil, pour oil into suction
pipe beforehand.

7

●Daily Start-up Inspection
・Be sure to make the necessary inspections every time before start-up.
In particular, for oil leaks from the pump or pipes, abnormal noise and heating.
Caution:If any abnormalities are discovered, immediately stop the pumpand check for the problem area.

●Regular Inspections
・If the pump is used as an important safety parts, regular inspections should be
performed at least once a year to ensure that they are operating correctly.
・These inspections should be carried out in our plant or facilities approved byus.

Maintenance・Seal kits and spare parts should be kept on hand to deal with sudden faults orpoor operation due to aging deterioration.
・The most common reason for poor performance is the use of fluids that havebecome dirty or degraded. Therefore, the oil replacement and othermaintenance work should be performed on a regular basis.
・Be sure to cease all operations and perform necessary inspections andmaintenance if there are any abnormal sounds, heating or other abnormalities
when using a motor that had been kept in storage for an extended period oftime.
・The coupling and oil seals used for the Trochoid pump and motor are
consumable parts and so will need to be replaced on a regular basis (1 year or
8,000 hours of use).
・The pump service life will become shorter than 1 year or 8,000 hours of use If it
is operated in an environment other than as stated above
・There are certain types of seal-kit that we cannot supply, such as ones for fueloil, cutting-oil or heat-resistant types.

Warranty
・Faults caused by conditions outside the stated specifications or attributed toforeign matter or other external causes are not covered by the warranty.
・The terms of warranty is for 1 year after the delivery or 8,000 hours of use,whichever occurs first. The warranty applies only when operated within the
product specifications and in accordance with the “Instruction Manual for
Trochoid and Lunary Pumps” stated in this Trochoid Pump Catalog.
・The warranty doesn’t cover any faults caused by any modifications or
disassembling of the pump made by customer.

8

Pump Selection●Necessary Flow Rate.
・Refer to the Trochoid Pump Catalog or the drawings. (Catalog values are just forreference only and not for guaranteeing the performance.)
・The discharge flow rate will vary depending on the type of oil you use,
temperature and pressure. (Flow rate varies depending on the pump use
conditions and environment.)・Pumps that provide plenty of leeway should be selected.
●Necessary Pressure.
・Refer to the Trochoid Pump Catalog or the drawings.
-The setting must not exceed the pump's rated pressure and the motor rating.
●Relief Valve Set Pressure.
・The default setting of relief valve pressure is the cracking pressure.
・The setting must not exceed the pump's rated pressure and the motor rating.
- Cracking pressure is the pressure at which the relief valve starts to open andallow a certain amount of oil to flow.
・The relief valve can be used as both a safety valve and as an pressure control
valve. Two types of relief valves are available (external-return type and internalreturn type) depending on the intended purpose.

Caution:When using the internal-return type as the safety valve, do not run
the pump continuously more than 30 seconds if running the pumpagainst closed discharge. It could result in pump or motor burnout.

When using the internal-return type as a pressure control valve,
do not make any settings that would allow for the relief amount to
Caution:exceed 50% of the pump flow rate. This could result in abnormal
pump heating or pump damage.

Caution:If an external-return type relief valve is selected, the relief oil
must be returned to completely below the tank oil surface.

・Set the relief valve set pressure slightly higher than the pressure actuallyneeded. The necessary discharge amount will not be obtained if oil leaks fromthe relief valve.

9

●Applicable Liquids
・Applicable Liquids
Trochoid pumps and Lunary pumps can handle a very wide range ofapplications, but be aware that these pumps were intended to use with oils.
-2HT and GD series, the trochoid pump for low viscosity, is applicable to fueloils (except high vapor pressure oils such as gasoline)-2HW series, the Trochoid pump for coolant, can be used with coolant fluid.
Please consult your coolant water supplier as the pump service life may besignificantly shorten or pump may get damaged if operated under a certain oil
temperature or environment.
・Trochoid pumps and Lunary pumps adopt a self-lubricating method so that thesliding surfaces and bearings are lubricated by the pumping oil itself.

Caution:The pump may become damaged if it is used with water, liquids
which contain corrosive substances or don’t offer lubricity or rust
protection.
Check with the oil manufacturer (or distributor) for the

Caution: compatibility of the oil with the Trochoid seal material in advance.
Use of incompatible oils may cause leaks.
・It is very rare, though certain operating environment, pumped liquid, swarf orwork materials may cause oil leakage and damage the pump. If it is the case,the pump cannot be used.
・Please consult us if using oils with low viscosity as you may need to select apump specially designed to handle it and maximum permissible operatingpressure will also be restricted.
Caution: The pump may get damaged if using oils with low viscosity.
・Some fuel oils contain properties that will cause the standard oil seals to swell. Be sure

to check the compatibility with the oil before use.
Caution:

Do not use gasoline or any other high vapor pressure oils. It
could result in explosions or fires.

If you use with fire-resistance fluids, please contact us as there are some seal
types which do not have durability against them.
●Ambient Temperature
・Ambient temperature range of Trochoid and Lunary pumps is -20°C ~ 40°C.
・Ambient temperature range of our motor is -10°C ~ 40°C.
Operations outside the above temperature ranges could damage
Caution: the Trochoid pump, Lunary pump or motor, resulting in a serious
accident

10

●Oil Temperature Range.
・The temperature range of the oil is -5 ~ 80°C. (GD-2H is 20 ~ 40°C)
・The models with seal packing code of [VF] can handle the oils within thetemperature range of 80 ~ 120°C.
・The models with seal packing code of [VH] can handle the oils within thetemperature range of 120 ~ 200°C.
-The maximum operating pressure is 0.7MPa when the oil temperature is 80°C
or higher.
・The temperature gap between the pump and the oil must be within 40°C.
・Normally motor and pump have specified temperature range for the operating
environment, so be sure to take measures to keep the oil temperature within that
range.
Operations outside the above temperature ranges could
significantly shorten the Trochoid and Lunary pump’s service life,
Caution: decrease performance and result in leaks. Please consult us if
running the pump outside the above temperature ranges, as it
may require the pump with special specifications.

Warning:

Pumping a high temperature oil could cause burns from pumps
or leaked oil.

●Applicable Viscosity Ranges.
・The permissible viscosity range of oils for Trochoid pump is 10 ~ 500mm2/s.
Refer to “Suction Capacities” on P.14 for your reference.
-The permissible viscosity range of oils for 2HT series (for oils with low viscosity)and 2HW series (for coolant fluids) is 2 ~ 100mm2/s.
・The permissible viscosity range of oils for high-viscosity pumps (3V, Lunarypump) is 46 ~ 2,000mm2/sec.
Operations outside of the above viscosity ranges could
Caution: significantly shorten the service life of the Trochoid and Lunary
pumps, decrease performance and result in leaks.
・The volumetric efficiency (discharge amount) drops as the viscosity becomes lower.
・The required power (motor output) increases as the viscosity becomes higher.
-Low winter temperatures must be taken into account when selecting a motor.
・Please consult us if using oils with low viscosity, as the maximum applicablepressure may be restricted.
・Please consult us for special specifications if running the pump outside theabove viscosity ranges.
Caution:

Running the pump in the oil with high viscosity or at high speed
may cause pump malfunctions.

11●Rotation Direction.
・The rotation, suction and discharge directions of the Trochoid and Lunary
pumps are fixed, except for some models that offer forward and reverse
rotation. Set the rotation direction of the motor in accordance with therotation direction displayed on the pump nameplate.
・The Trochoid and Lunary pumps have holes on the pump suction (negative
pressure) which are provided to release pressure for protecting the oil seal. If a
mistake is made in setting the rotation direction, the suction and discharge
positions will be switched. As a result, discharge pressure will flow through theholes which is originally intended to release pressure. This pressure will build up
against the oil seal, causing seal break and oil may splash out.
Suction
Port
Pump
Shaft

Trochoid
Rotor

Oil Seal

Discharge
Port・As shown in the figure on the left, the oil isdischarged from the discharge port. When there is aback pressure, the oil passes through the bearing A,
lubricates the ball bearing, and stopped by the oilseal. When the pressure exceeds 0.03 MPa (0.3
kgf/cm2), however, the seal may rupture and the oilsplashes out.
・A small hole B is provided to return the trapped oil tothe suction side. In other words, the oil trapped inspace C is always returned to S area. If the pumprotates backwards, the suction port and discharge
port will be switched and the oil pressure goes
directly to the oil seal through the small hole B. Soonthe seal will rupture and end up with oil leakage, as
there is no oil passage to release the pressure.
Ruptured oil seal must be replaced as the lip isdamaged. Please consult us when replacing the oilseal.

Be sure to set the pump rotation direction correctly. Mistakes in
Warning: rotational setting could break the oil seal and the oil may splash
out, resulting in unexpected accidents.

Motor Selection●Required Power for the Pump.
・Select a motor with adequate power margin with reference to the performancecarve of the pump on the catalog.
・The power required by the pump will vary depending on pressure, flow rate andviscosity of the oil.
・More power is required as the viscosity of the oil increases.
-Low winter temperatures must be taken into account when selecting a motor.
・The single phase motors do not conform to the motor high-efficiency regulationin USA.

12

●Applicable Voltage and Frequency.
・Make sure that you are applying the correct power voltage and frequency
indicated on the motor name plate.
Caution:Applying an incorrect voltage or frequency could damage themotor or result in abnormal pressure or flow rate.

●Surroundings of the installation site.
・Confirm the surroundings of your pump installation site. Select a motor foroutdoor use or a explosion-proof motor depending on the surroundings of theinstalled location.

Pump Drive Method●Driving Method.
・Pump driven by special-purpose motor: Trochoid pump with motor.
・Pump driven by general-purpose motor: Trochoid pump with motor and basecoupling or Lunary pump with motor and base coupling.
・Power source other than electric motor: Trochoid pump, Lunary pump.
・Trochoid and Lunary pumps are designed on the premise that the motor andshaft center are arranged in a straight line. Centering of the drive shaft andpump should be within 0.05mm TIR.
Rotate the dial gauge 360° to ensure that the dial gauge run-out is within 0.05 mm.

・Please contact us for the drive methods in which the load is placed on pumpshaft along radial or thrust direction.
Poor alignment between the motor and the Trochoid or Lunary
Caution: pump may result in vibrations, loud noises and damage to thepump.
When attaching the coupling to the pump shaft, do not forcibly
Caution: hammer the coupling into place. It could result in pumpmalfunctions.

Caution:Placing thrust load or radial load on the pump shaft may cause
pump malfunctions.

13

Suction Capacities
・Set the suction head for the Trochoid and Lunary pumps within 1m when runningthe motor at a speed of 1,000 ~ 2,500min-1 or keep the suction pressure at thesuction port within -0.03 ~ 0MPa when the port is fully filled with oil.
・Pressure on the suction side lower than -0.03MPa could result in cavitation,
abnormal noise, heating, poor discharge and damage to the pump.
・Please consult us if the pump should be operated outside the specification
range as stated above.
Caution:Suction capabilities will drop when there is large resistance in the
discharge line.

Caution:Suction capabilities will drop significantly when air enters fromthe suction line.

・The pump must be mounted at a position below the oil surface level if runningthe pump at slow speed.

14Troubleshooting Chart・If you experience no oil discharge, a high pitched sound, or such other abnormal
phenomena soon after the installation, check the troubleshooting chart in thetable that follows. If you cannot find out the cause of trouble, consult us or yourdealer.
Pump Troubleshooting Chart
Symptom
Insufficient flowor pressure.

Possible causes
Discharge amountis insufficient or no
oil discharge.

Pump doesn’tdraw oil.

Check methods
・Measure the suction pressure
with vacuum gauge, the suction
pressure lower than -0.03MPa
may cause cavitation.
・Check for suction pipe
clogging.
Check out the suction filter if it’sclean.
・Not enough oil in the tank.
・Check the oil level with level
gauge or make a visual check.
・Is the pump drawing air fromthe pipe joints?
・Viscosity of oil is too low for theintended pressure.

Oil leaks.

Oil leaks from oil
seal.

Possible remedies
・Replace the oil with lower
viscosity.
・Clean out the suction filter.

・Fill the tank with oil up to thespecified level.
Guide line: The amount of oil
which is 3-4 times larger thanthe pump flow rate.
・Retighten the pipe joints.

・Change the viscosity of oil tothe suitable level for yourpump.
・Tighten up the relief valve
・Clean out the relief valve orpressure control screw whileremove foreign object as
referring to the pressure gauge.
something might get stuck in
Result : Pressure won’t build up. the relief valve.
・Tighten up the relief valve
・Set pressure is too low. Raisepressure control screw while
the set pressure as oil isreferring to the pressure gauge.
leaking through the relief valve.
Result : Pressure builds up.
・The pump is rotating backward. ・Change the direction of rotation
・Visual check of rotation
as indicated on the pump.
direction.
・Is suction line or discharge line
・Release the suction line andblocked?
discharge line.
・Widen the diameter of suction
pipe or discharge pipe.
・Is the pump rotating in correct
・Repair or replace pump.
direction?
・Is suction pipe pressurized?
・The pump should be mounted
at a position higher than oil
surface level.
・Pressure resistance of oil sealmust be within the range of 0 ~0.03MPa.
・If check valve (NRV) is installedin the suction line, pressure
may be trapped inside thedischarge line and as it has
nowhere to go, the wholepressure will be applied on oil
seal area.
・Oil temperature exceeds
・Oil seals for special materials
maximum resistancealso can be supplied if
temperature of oil seal.
requested.
・Oil is incompatible with oil seal
・Replace seal or pump.
materials.

15SymptomPossible causes

Check methods
・Blackout or voltage drop.

No oil discharge.

Motor doesn’trotate.

・Solenoid valve or breaker trips.

Overloading.

・Power supply is disconnectedor has a poor connection.
・Is power rating adequate forthe operation.

Breaker trips.

Loud noise.
Abnormal noise.

Pump won’t rotate or
rotate unsmoothly by
hand.
・Suction resistanceis too high(cavitation).
・Suction pipe is too
narrow.
・Suction pipe too
long.
・Motor speed is too
fast.
・Suction filter has alarge resistance.
・Oil viscosity is too
high.
・Suction lift is too
high.
・The pump is
drawing air(Airation).

・Are viscosity and lubricity of theoil adequate?
・Is the oil fairly clean?
・Measure the suction pressure
with vacuum gauge.
・Cavitation must be occurring if
suction pressure is lower than 0.03MPa.

Possible remedies
・Check the power supply
equipment.
・Reset the Solenoid valve,
breaker.
・Replace or reconnect the cable.
・Use motor with higher output
rating.
・Use pump with lower capacity.
・If you find it difficult to choose
the right motor or pump, please
consult us after checking oil
viscosity, required pressure
and pipe layout.
・Rotor galling or foreign object
stuck inside the pump.
・Repair or replace pump.
・Make sure that suction
pressure is within -0.03 ~ 0MPa
(Close to atmosphericpressure).
・Replace with larger pipes.
・Make the pipe length shorter
・Replace with filters in which theresistance is smaller.
・Replace with oil with lower
viscosity.
・Lower the suction lift.

・Is there foam inside the tank?
・Make sure that air doesn’t enter・Is there loose pipe connections? the tank, pipes and inside thepump.
・Check if returned pipe is under・Make sure that the returned
the oil surface or not.
pipe is always under the oil.
・Misaligned coupling. ・Check the concentricity of・Make sure that the coupling’s
couplings and shaft alignment.
concentricity is within thespecified level.

16

Revision number : T201806EN

Your dealer：

For further information：
HP：http://www.nopgroup.com
Tel ： +81-3-6402-4041
Fax ： +81-3-3436-1777

Sumitomo Fudosan Higashi Shimbashi
Building-6 3F, 1-2-4 Hamamatsucho,
Minato-ku, Tokyo, Japan, 105-0013

17