CAUTIONS ON USING PUMPS AND MOTORSAPUMPS AND MOTORS

1. To avoid serious accidents and injuries!
●Thoroughly read “Cautions on Using Pumps” in the Operating Manual and make sure you understand the information in this section before
operating a pump or motor.
●The cautions and warnings below do not cover all possible dangers. Read through the Operating Manual before using a pump / motor andgive top priority to safety during use.
●To ensure safe use of the products, observe the applicable regulations.
・Fire Service Act
・Industrial Safety and Health Law
2. Use a Product of the Correct Type
There are many hydraulic devices that have the same or similar outside dimensions. When installing a pump /motor, check
WARNINGthe specification indicated on the nameplate or the inscribed information to confirm that the pump / motor is the correct one.
DANGER
When installing a pump / motor in an explosive or combustible environment, be sure to use a product suitable for thisoperating environment.
3. Handling of Products
CAUTION
Wear appropriate protective gear when handling a pump / motor to avoid injury.
CAUTIONA pump / motor is a heavy object and careless handling can cause hand crushing injuries or back injuries. Pay carefulattention to your working method.
CAUTION
Do not stand on a product, knock it, or drop it, and also avoid exerting external force on it.
Failure to observe this instruction can cause malfunctioning, damage, oil leakage and other product failures.
CAUTION
Completely wipe any hydraulic oil off the product and shop floor. Failure to observe this caution can cause an operator todrop the product or sustain injuries by slipping.
4. Installation / Removal / Piping / Wiring of Pumps / Motors
CAUTION
Only personnel with sufficient knowledge are allowed to install / remove pumps and motors (including piping).
WARNING
Connection of cables and other electrical work must be carried out by an authorized person.
WARNING
Shut off the power supply to the pump / motor and ensure that the motor or the engine has stopped completely before
starting work such as installation, removal, piping or connection of cables. Also release the residual pressure from thesystem and confirm that the system is completely free from residual pressure before starting the necessary work.
CAUTIONThe pump / motor mounting base must have sufficient rigidity.
CAUTION
Avoid undue load being exerted on the pump from the piping (particularly on steel pipe connection). Even if the pump iscentered at the installation, problems such as poor centering accuracy by deformation, poor performance of pump,decrease in life or breakage could occur if any excessive load is applied from the piping. The same care must be taken
also on excessive load being exerted from the piping as a result of vibration on equipment or sudden changes in pressureduring operation.
CAUTION
The pump / motor mounting faces and holes must be clean.
Soiling will cause trouble such as breakage and oil leakage due to insufficient tightening of bolts and damage seals.
CAUTION
Confirm that the rotating direction of the pump, indicated by the arrow symbol nameplates or inscribed symbols, and therotating direction of the motor or engine, operated independently, agree with each other. Install the pump only after
confirming this.
CAUTION
Before connecting the pump to the coupling, operate the motor independently to confirm that it rotates in the same
direction as indicated on the arrow symbol nameplate, inscribed symbols, or other.
CAUTION
Confirm that the runout of center or face at the installation of pump / motor is within the allowable value.
Use a flexible coupling not to exert the radial or thrust load to the shaft.
Unless the shaft is centered properly, it could damage the bearing or oil seal, or damage the shaft. Pay careful attention tothe centering of shaft.
Coupling
Chain coupling
Dry coupling
Never use the belt drive.
CAUTION

Axial eccentricity
0.05 mm or less
0.5 mm or lessAngle error
Within 0.5°
Within 1°

Do not subject the pump shaft or motor shaft to shock by tapping them with a hammer during installation or removal.
Failure to observe this instruction can cause damage to the product or deteriorate its functions significantly.
CAUTION
Make sure that the shaft end will be inserted in the coupling more than 2/3 of the length of coupling.
CAUTION
When installing a pump or a motor, always use the specified bolts and tighten them to the specified torque. Installation ofa pump or a motor not meeting the specification may cause operation failure, break and or oil leaks.
WARNING
Securely fix the part that connects the rotating shafts of the pump and motor so that they will not become disconnected orfly out during operation. Also provide a protective cover to prevent entangling of hands, clothing, etc.
WARNING
Shut off the power supply before starting electric cable connection work. Failure to observe this instruction cause electricshock.
CAUTIONIf drain piping is necessary, turn the drain pipes such that the pressure in the casing does not exceed 0.03 MPa. Returnthe drain directly to the reservoir with care to release in the oil.
CAUTION
If the space within the casing has to be filled with hydraulic oil during operation, runt the drain pipes so that the space inthe casing is always filled with hydraulic oil and air is not allowed to enter. Consideration must also be paid to the designof the drain pipe run so that the space within the casing is filled with hydraulic oil even if the pump is not operated for along time.
CAUTION
When a pump other than one with a pressure compensation function (with the maximum pressure adjustment function) isused, install a relief valve that regulates the maximum hydraulic circuit pressure near the pump outlet.
CAUTION
When connecting a pipe to the suction side, supply a pressure within -0.02 to +0.03 MPa and a flow rate within 2 m/sec tothe suction side. Also install a suction filter or strainer of 150 mesh at the suction side.
CAUTION
It is recommended to provide a circuit that can make the discharge pressure no load, on the pipe at the discharge side inorder to facilitate air bleeding from the pump and suction pipe at starting. If a line filter (10 to 40µ) is installed on the returncircuit to the reservoir, it is effective to prevent failure by contamination of hydraulic oil and extend the pump life.
5. Running the Pump / Motor
WARNING
Before operating the equipment where the pump and motor are installed, confirm that the hydraulic circuit and electric
cable connection are correct and that there is no looseness in the coupling.

A−2

WARNINGWARNINGWARNING

Recommended control standard of hydraulic oil (Replacement standard)
Property
Petroleum base oil
Water-glycol
Fatty acid ester
Specific gravity
15/4℃
0.05 or less
Viscosity change%
10 to 15
10 to 15
10 to 15
Total oxidation
mgKOH/g
0.5 or less
Insoluble part N pentane %0.5 or less
Water%
35 or less
0.1 or less
0.1 or lessPH
09 or lessContaminants
mg/100 ml
10 or less10 or less10 or less・Replace when it emulsifies due to mixed water, even if it is within the control standard value.
・Recommended pollution level is within NAS12 for general hydraulic line and NAS6 or less for servo valve line.
CAUTION

Flash the inside of circuit sufficiently before changing the hydraulic oil to be used. Avoid also mixing with a different kind ofhydraulic oil.
CAUTION
Use within the operating ambient temperature at 0 to 60℃.
7. Maintenance and storage
CAUTION
Refrain from modifying, disassembling or reassembling the pump and motor. It may fail to achieve the specified
performance, resulting in failure or accident. Please consult us when it is obliged to modify, disassemble or reassemble.
CAUTION
When transporting or storing the pump and motor, take care of the environment conditions such as ambient temperature,temperature and ensure the prevention of dust and rust.
CAUTION
When using the pump and motor after a long time stoppage, it may be necessary to replace seals.
CAUTION
Oil leaks from hydraulic devices or equipment, if they are unattended, could cause serious accident. Repair or take otherappropriate measures.

A−3APUMPS AND MOTORSNever operate the system without installing covers on rotating parts.
Take measures to ensure that clothing and accessories will not be caught by rotating parts. Never try to touch these parts.
Start the system with pressure controlling devices such as relief valves at a low pressure setting. Confirm the pressure
setting with pressure gauge or other appropriate device. Run the system only after confirming that it has started correctly
at a low pressure setting; and check that the system is running at the correct pressure.
WARNING
Press the emergency stop switch or shut off the power supply if an abnormality is found at the start of system operation.
WARNING
If the pump / motor has an oil filler port in the casing, fill the casing with hydraulic oil by supplying fresh hydraulic oil
through the oil filler part in the following cases – when starting operation for the first time, after inspecting / repairing thehydraulic circuit, or when starting the system after a long stoppage. Wipe spilled oil cleanly not to mistake it as a leakage
from the pump or motor.
CAUTION
Repeat inching operation until the pump draws in hydraulic oil correctly. If the pump fails to draw in hydraulic oil correctly
even after repeated inching operation, bleed the air from the hydraulic pipes (air bleed valve HAB3-T*-02). If air bubbles
and hydraulic oil flow through the air bleed plug or the pump operation sound changes, tighten the air bleed plug
immediately and keep running the pump in the no-load state for approximately 5 minutes.
CAUTION
Start the motor at a low load and confirm that it is rotating in the correct direction.
CAUTION
Operate the pump / motor correctly according to the pressure, flow, rotational speed, oil type, oil temperature, viscosityand other specifications stated in the operating manual, catalog, drawing, specification and other documents.
CAUTION
If the pump operation sound is louder than normal, it may be an indication of cavitation. If the sound is loud, check thelevel of hydraulic oil in the reservoir, and check for clogging of the suction strainer and filters and looseness of the suction
pipe.
CAUTION
Check that the surge pressure generated when the system starts and stops and when the speed is changed is within theallowable range.
If the operation sound differs from that observed ruing normal operation, the pump / motor may be faulty. The operation
sound changes is the pump suction side strainer and filter are clogged or if component parts are abnormally worn or point
to break.
Remember the normal system operation sound so that you can detect changes in the operation sound at an early stage
and find abnormality quickly.
CAUTION
Grease used during assembly may come out from the pump shaft or joint between the pump and the motor at thebeginning of use of motor and pump. Take care not to mistake it as an oil leak.
WARNING
Do not touch the pump / motor casing during operation since they may become hot.
WARNING
Stop operation immediately and take necessary corrective measures if any abnormality, such as abnormal noise, abnormal
heating, abnormal vibration, oil leakage, smoke or an abnormal smell, is detected. It is advisable to use sensors that
detect abnormalities. Failure to observe this instruction can cause damage, fire, and injury.
CAUTION
Do not run the system in normal loaded operation while using a high-viscosity oil. Failure to observe this instruction cancause failure of the system.
WARNING
Check if the system is running under an excessively high load by reading an ammeter. An excessively large load is caused
by faulty installation, seizure and other factors. Eliminate the cause of the trouble before operating the pump / motor.
6. Management of Hydraulic Oil
CAUTION
Use the R&O type and abrasion-resistant hydraulic oil, ISO VG32 to 68, or equivalent and in the recommended proper
ranges of oil temperature and viscosity.
Recommended proper viscosity is 20 to 100 mm2/s for the pump. Use the oil in the following range.
ISO VG 32: Oil temperature 0 – 60℃ (350 – 15 mm2/s)
ISO VG 46: Oil temperature 6 – 65℃ (350 – 18 mm2/s)
ISP VG 68: Oil temperature 13 – 65℃ (350 – 25 mm2/s)
CAUTION
Operate with a circuit configuration that will maintain always the degree of pollution of hydraulic oil to be used within therecommended value, and check the pollution and the filter regularly. Also inspect regularly conditions of oxidizing,
deterioration and water content of hydraulic oil, and replace the oil if it exceeds the recommended values of the maker ofhydraulic oil.