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The BM2 Series Orbital Hydraulic Motor is a shaft-distribution motor built on a column-mounted rotating stator pair with automatic pressure compensation. Peak pressure reaches 22.5 MPa, peak torque reaches 460 N·m, and displacement covers 25 to 160 cm³/rev. The design maintains high volumetric efficiency under continuous high-pressure duty, so construction machinery, mining equipment, deck machinery and agricultural drives get stable output without frequent servicing.
Raydafon supplies BM2 Series Orbital Hydraulic Motors direct from the Ningbo factory, with interchangeable mounting flanges and shaft options matched to the original equipment being replaced. OEM and project quantities are supported with full documentation and a 12-month warranty.
The BM2 Series Orbital Hydraulic Motor is a shaft-distribution hydraulic motor with a column-mounted rotating stator pair and automatic pressure compensation. Displacement range is 25 to 160 cm³/rev, peak pressure is 22.5 MPa, and peak torque reaches 460 N·m. Suitable for construction machinery, mining equipment, ship deck machinery, agricultural equipment and injection molding machine screw drives. Raydafon supplies BM2 Series Orbital Hydraulic Motors as an ISO 9001 certified factory in Ningbo, China, with OEM support and 15–30 day lead time.
Design Principle / Shaft Distribution
A BM2 Series Orbital Hydraulic Motor is a shaft-distribution hydraulic motor using a column-mounted rotating stator pair. The automatic pressure compensation inside the stator pair keeps the clearance tight as pressure rises, which is what separates the BM2 Series from a fixed-clearance gerotor motor. The result is high volumetric efficiency under continuous high pressure and a working life that is not compromised by internal leakage after the first few hundred hours.
Low starting pressure, high efficiency and good retention. The BM2 Series Orbital Hydraulic Motor delivers smooth output from very low speed without the stick-slip behaviour common on fixed-clearance motors.
The shaft seal is rated for high back pressure, so the BM2 Series Orbital Hydraulic Motor can be used in series or parallel circuits without an external case drain in most configurations.
The linkage shaft between the rotor and the output shaft is designed for long service life under reversing and shock load. This is critical for crawler travel drives and winch applications.
The flow distribution system is tuned for low noise output, which matters when the BM2 Series Orbital Hydraulic Motor is mounted on equipment that operates near working areas or in enclosed cabs.
Standard flange patterns and shaft options allow the BM2 Series Orbital Hydraulic Motor to drop into an existing drive without modifying the machine frame. Multiple port and shaft configurations are available.
Displacement · Speed · Torque · Pressure · Flow
The table below covers the complete BM2 Series Orbital Hydraulic Motor range, from 25 cm³/rev to 160 cm³/rev. Rated values apply under rated flow and pressure. Continuous values are the maximum the motor can sustain without interruption. Intermittent values are the maximum for 6 seconds in every minute. Peak values are the maximum for 0.6 seconds in every minute.
| Parameter | 25 | 40 | 50 | 63 | 80 | 100 | 125 | 160 |
|---|---|---|---|---|---|---|---|---|
| Actual displacement (cm³/rev) | 25 | 39.4 | 49 | 62.7 | 78.7 | 97.3 | 122.7 | 158 |
| Max speed — rated (rpm) | 1300 | 985 | 790 | 615 | 670 | 542 | 430 | 330 |
| Max speed — continuous (rpm) | 1550 | 1100 | 990 | 780 | 743 | 598 | 476 | 375 |
| Max speed — intermittent (rpm) | 1780 | 1380 | 1210 | 947 | 940 | 763 | 605 | 470 |
| Max torque — rated (N·m) | 42 | 75 | 94 | 120 | 150 | 186 | 235 | 320 |
| Max torque — continuous (N·m) | 42 | 75 | 94 | 120 | 190 | 238 | 300 | 380 |
| Max torque — intermittent (N·m) | 58 | 91 | 120 | 153 | 220 | 272 | 343 | 430 |
| Max torque — peak (N·m) | 71 | 112 | 145 | 186 | 233 | 289 | 365 | 460 |
| Max output power — continuous (kW) | 5.5 | 8.5 | 9.5 | 15 | 12.5 | 13 | 12.5 | 12.5 |
| Max output power — intermittent (kW) | 7 | 9.8 | 11.2 | 17 | 15 | 15 | 14.5 | 14 |
| Max pressure differential — rated (MPa) | 12.5 | 14 | 14 | 14 | 14 | 14 | 14 | 14 |
| Max pressure differential — continuous (MPa) | 12.5 | 14 | 14 | 14 | 17.5 | 17.5 | 17.5 | 17.5 |
| Max pressure differential — intermittent (MPa) | 16.5 | 16.5 | 17.5 | 17.5 | 20 | 20 | 20 | 20 |
| Max pressure differential — peak (MPa) | 22.5 | 22.5 | 22.5 | 22.5 | 22.5 | 22.5 | 22.5 | 22.5 |
| Max flow — rated (L/min) | 35 | 40 | 40 | 40 | 55 | 55 | 55 | 55 |
| Max flow — continuous (L/min) | 40 | 45 | 50 | 50 | 60 | 60 | 60 | 60 |
| Max flow — intermittent (L/min) | 45 | 55 | 60 | 60 | 75 | 75 | 75 | 75 |
Rated speed and torque are the output values under rated flow and pressure. Continuous value is the maximum the motor can work continuously. Intermittent value is the maximum for 6 seconds in every minute. Peak value is the maximum for 0.6 seconds in every minute. For circuit design, always confirm the actual duty cycle with Raydafon before finalising the motor model.
Applications / Industries
The BM2 Series Orbital Hydraulic Motor is specified across mining, construction, metallurgy, ship deck, agricultural and injection molding machinery. Its high-pressure shaft seal and low starting pressure make it particularly suitable for drives that start under load, run at low speed with high torque, or operate in series circuits.
Selection Inputs / OEM Supply
The correct BM2 Series Orbital Hydraulic Motor cannot be confirmed from a product name alone. Send the five items below and Raydafon will confirm the displacement, shaft option, port configuration and mounting flange, then issue a quotation with lead time. OEM replacement of an existing motor is supported when the original nameplate or dimensioned drawing is provided.
Raydafon's engineering team will confirm the appropriate model, shaft and mounting configuration within one working day of receiving the required inputs.
Buyer Questions / OEM Supply
The BM2 Series Orbital Hydraulic Motor is a shaft-distribution hydraulic motor using a column-mounted rotating stator pair. It differs from a fixed-clearance gerotor motor because the stator pair compensates automatically as pressure rises, holding volumetric efficiency under continuous high-pressure duty. Displacement range is 25 to 160 cm³/rev and peak pressure is 22.5 MPa.
Yes. Send the original manufacturer's model number, nameplate photo or a dimensioned drawing, and Raydafon will confirm whether the BM2 Series Orbital Hydraulic Motor can be matched directly in displacement, shaft, flange and port configuration. Where the original is obsolete, a functionally equivalent BM2 Series motor can be supplied against the same envelope.
BM2, BM2H, BMRWN and BMR2 are designation variants that refer to the mounting and shaft configuration options of the same core motor platform. The displacement, speed, torque, pressure and flow ratings are identical across the variant column. Raydafon confirms the correct variant at the quotation stage against the application drawing.
Yes. The BM2 Series Orbital Hydraulic Motor uses a high-pressure shaft seal rated for back pressure, so it can be used in series and parallel circuits without an external case drain in most configurations. Confirm the circuit arrangement at the quotation stage so that the correct seal option is specified.
Standard configurations ship in 15 to 30 days. Custom shaft, flange or port configurations are confirmed with the quotation. MOQ depends on the specific model and is confirmed when the specification is fixed. Raydafon supplies OEM, project and factory-direct quantities.
Every BM2 Series Orbital Hydraulic Motor ships with an outline drawing, installation and maintenance manual, a running test report and a lubrication recommendation. Material certificates and third-party inspection reports are available on request when the project specification calls for them.
Whether you are replacing an existing motor on a crawler travel drive, specifying a winch system for a ship deck, or designing a new hydraulic circuit for mining or agricultural equipment, Raydafon can quote a BM2 Series Orbital Hydraulic Motor to your pressure, displacement, shaft and flange requirements. OEM and project quantities supplied directly from the Ningbo factory.
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Luotuo Industrial Area, Zhenhai District, Ningbo City, China
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