Troubleshooting and solution of low speed high torque hydraulic
motors
1.Matters needing attention
1.1 Output steering (with photos)
1.2 The correct use of the motor will directly affect the working
life. Therefore, the following basic requirements must be met.
1.2.1 System requirements (with photos)
The system should be equipped with a corresponding oil filter to
ensure the cleanliness of the system oil.
The hydraulic circuit must be equipped with a cooling system to
prevent excessive oil temperature.
Pressure gauges and thermometers must be installed in the oil inlet
lines.
A pressure gauge should be installed in the hydraulic circuit of
the hydraulic pump.
1.2.2 System hydraulic oil requirements
According to the different ambient temperature and usage, the oil
used should have good viscosity-temperature performance, good
defoaming properties, anti-oxidation, anti-rust, high flash point,
etc. During the operation of the motor, its viscosity is between
(25-70)*10-6m2/s, and the water, alkali and mechanical impurities
in the oil must not exceed the allowable value.
It is recommended to use YB-N46, YB-N68 anti-wear hydraulic oil.
The filtration accuracy of the system is better than 20μm.
Normal working oil temperature is 25-55℃, short-term working oil
temperature is not higher than 65℃.
2. Motor installation
Before installation, check whether the motor is damaged. The motor
oil stored for a long time needs to be drained and rinsed to
prevent the internal moving parts from sticking.
The motor mounting bracket must have sufficient rigidity to prevent
shock and vibration during rotation.
The mounting bolts must be tightened evenly.
Connection method of drain pipe:
The BMR motor has two built-in check valves, and the leaked oil can
return to the oil return pipe through the check valve, (with
photos)
A) When the oil return pressure is ≤1Mpa, there is no need to
connect the drain pipe;
B) When the oil return pressure is greater than 1Mpa, the drain
pipe must be connected. (Drain pipe location diagram)
The motor is unstable when running at low speed, and can be
eliminated by applying back pressure, the back pressure value is
not less than 0.2Mpa.
This type of motor can not be operated under the pump working
conditions, nor can it be used as a pump.
The installation surface should be flat.
The installation should determine the connection flange, the stop,
and the output connection shaft size is accurate.
Ensure that the output shaft and the device connected to the
transmission have good concentricity. When the output shaft is
installed, it is necessary to prevent the axial thrust of the
output shaft and the interlocking device.
(The cycloidal motor BMR bears a small radial force.)
During the installation process, the smoothness and parallelism of
the connecting plate part of the oil inlet and outlet are protected
to prevent the oil sealing effect caused by the bumps from being
bad, resulting in oil leakage.
The screws and the rear cover of the rear of the motor must not be
hit during installation.
If you want to tap, please tap the mounting flange (with photos)
The motor cannot be installed forcefully or twisted.
Do not remove the plastic plugs above the pipelines and oil pipes
before they are installed.
When the system is connected, the relationship between the
installation position of the motor inlet and outlet on the
installation drawing and the rotation of the motor should be
recognized. During the installation, it was found that the oil
inlet and outlet are not suitable for the corresponding positive
and negative rotation directions of the output shaft. Replacing the
installation of the oil inlet and outlet pipes for the A and B
chambers can achieve the opposite effect to the original working
rotation direction.
3. Use of the motor
3.1 Use of motor
The pressure, flow, and output power of the motor must not exceed
the specified values.
When running for a long time, the oil temperature does not exceed
65℃.
Motor limit working temperature: -30℃-70℃
3.2 Commissioning
Before starting, check the motor installation, whether the
connection is correct and firm, and the system is correct.
Check whether the oil inlet and outlet directions and motor
rotation direction meet the requirements of working conditions.
The pressure of the relief valve of the oil supply line is adjusted
to the lowest value, and gradually adjusted to the required
pressure after operation. Tighten the inlet and outlet pipes and
the drain pipe.
After running the motor under no load for at least 10 minutes,
gradually increase the pressure to the working pressure, and
observe whether the motor is running normally at any time during
the operation.
During operation, the working conditions of the motor and system
should be checked frequently. If abnormal temperature rise,
leakage, vibration and noise or abnormal pulsation of pressure are
found, the machine should be stopped immediately to find out the
cause.
During use, when the temperature of the oil inlet is ≥65 °C, please
check whether the cooler works normally. To ensure the normal
working temperature of the motor surface.
Motor transportation should be equipped with appropriate wooden
boxes and cardboard boxes according to the size of the motor, and
plastic paper packaging on the surface of the motor to prevent the
moisture and moisture from invading the motor and causing the motor
to rust and cause motor failure.
Avoid placing the motor directly on the ground. No need to apply
anti-rust oil for a long time.
Motor storage environment: 10-9%RH, -20-65S C.
During transportation and storage, the motor should avoid moisture,
moisture and any
What corrosive gas.
4. Motor troubleshooting
The motor is a precision component, which needs to be installed,
commissioned and repaired by professionals. Without our company's
consent, it is not allowed to dismantle and repair it by yourself.
If the user unit has the conditions for dismantling and inspection
with the permission of our company, after reading the instructions
carefully, you can dismantle and inspect it yourself, but you must
pay attention to the following three points:
l When disassembling, be careful not to knock the parts and scratch
the hair, especially to protect the moving surface and sealing
surface of the parts. The disassembled parts are placed in a clean
container to avoid collision with each other. It is forbidden to
strike with a hammer during disassembly and assembly.
l The removed parts should be carefully inspected, and the worn
parts are basically replaced without repairing by themselves. In
principle, all seals are replaced.
l Before assembling, all parts should be cleaned and dried. Do not
use cotton yarn or rags to wipe the parts. The assembly place and
the tools used should be clean, and the output shaft should be
rotated after assembly. It should be flexible and free of jams.
Troubleshooting
| Serial number | Fault phenomenon | The Reason | Exclude |
1
|
The motor does not rotate | Hydraulic pump does not start | Turn on the hydraulic pump |
| Insufficient oil in the tank | oil |
| Directional valve in neutral | Open the directional valve |
| System overflow valve fully open | The system pressure is adjusted to the specified value |
| Motor torque is not enough | Replace the motor |
2 |
There is abnormal noise when the motor is running | There is air in the hydraulic system | Find out the reason for the intake air and discharge the air in the
oil |
| Vacuum | Increase fuel supply |
| Motor failure | Replace the motor |
| Support bearing is broken | Replace bearing |
| 3 |
Motor leakage | Damaged seal | Replace the seal |
| Parts have pores, trachoma, cracks, etc. | Replacement parts |
4 |
Motor heat | Hydraulic oil temperature is too high | Increase cooling capacity |
| Low motor efficiency | Replace wearing parts |
| Abnormal wear | Replace the motor |
5 | Increased oil leakage at the outer drain hole | Abnormal wear at the distribution shaft | Replacement parts |
| Wear of the needle column group of the cycloid wheel stator body |
5. Motor maintenance and post-processing
Regularly check the accessories in the hydraulic system, the
accuracy of pressure gauges, thermometers, etc.
Check hydraulic oil regularly:
It is not allowed to use mixed oils of different types of hydraulic
oils, and the period of renewal of new oils varies according to
different industries and mines.
Under normal circumstances: the hydraulic oil is changed every six
months
Disposal of waste oil after motor use:
Should be sent to a special waste oil treatment unit for
centralized treatment of waste oil.
If the motor is not used for a long time:
The cavity should be filled with oil, and the oil ports should be
sealed. Grease on the surface of the output shaft should be wrapped
with a cloth or sleeve.
Admonish
The manufacturer is not responsible for the consequences caused by
the user not following the above recommendations or using the motor
incorrectly.
Hanjiu Hydraulic, the hydraulic expert by your side !
