BM6 Series Hydraulic Orbit Motor BM6-630 BM6-800 BM6-985 BMT OMT 6K Interchangeable
Wuhan Xinlaifu Hydraulic Equipment Co., Ltd. is one of the leading manufacturers and suppliers of bm6 series hydraulic orbit motor bm6-630 bm6-800 bm6-985 bmt omt 6k interchangeable in China. With abundant experience, we warmly welcome you to buy high quality customized products at competitive price from our factory. Also, OEM&ODM service is available.
Specifications
| Parameter | 51D110-1 |
|---|---|
| Series | Series 51 / 51-1 (51D) |
| Displacement | 110 cc/rev (109.9 cc/rev) |
| Rated (Nominal) Pressure | 480 bar (7000 psi) |
| Maximum Pressure | 510 bar (7400 psi) |
| Minimum Input Pressure | 10 bar (145 psi) |
| Rated Speed | 2200–5600 rpm |
| Max Speed Range | up to 7000 rpm |
| Specific Torque (at max disp) | ≈ 0.35 N·m/bar (≈1067 lbf·in per 1000 psi) |
| Mounting Type | SAE 4-bolt flange (ISO 3019/1) / 2-bolt cartridge |
| Direction of Rotation | Bi-directional |
| Temperature Range | -40 °C to 115 °C |
| Typical Application | Hydrostatic transmission drives (replacement motor) |
Product Overview
If you are replacing a failed drive motor on a mini excavator, skid steer loader, aerial work platform, or agricultural machine, you are not just looking for a hydraulic motor. You are looking for a motor that bolts onto the existing flange, couples to the existing shaft, and connects to the existing hydraulic lines - without modification. And you need it to deliver the torque your machine was designed for.
The BM6 series is a disc valve gerotor (orbit) motor available in displacements from 195.7 to 982 cm³/rev. It is engineered as a direct interchange for the Danfoss OMT, Eaton Char-Lynn 6K, and M+S EPMT motor platforms - same mounting dimensions, same shaft options, same port configuration.
What makes the BM6 different from a standard orbit motor?
The BM6 uses a disc valve distribution system with an inserted tooth stator and rotor (Geroler) design. The disc valve plate automatically compensates for wear during operation, maintaining high volumetric efficiency over the motor's service life. The output shaft is supported by heavy-duty tapered roller bearings that permit high radial and axial loads - which means the motor can drive the load directly without a separate bearing housing.
The housing is high-strength cast iron, not aluminum. For machines operating in dusty, high-vibration environments - construction sites, agricultural fields, mining operations - cast iron provides the durability and thermal stability that aluminum cannot match.
Which BM6 model do you need? That depends on two questions:
What is your machine's required drive torque? → determines the displacement (195.7 through 982 cm³/rev)
What is your existing mounting interface? → determines the flange, shaft, and port configuration
Core Advantages
1. Full Displacement Range – Match the Motor to Your Torque Requirement
The BM6 series covers eight displacements from 195.7 to 982 cm³/rev. The selection logic is straightforward: larger displacement produces more torque but lower speed at a given flow rate.
| Model | Displacement (cm³/rev) | Continuous Torque (N·m) | Intermittent Torque (N·m) | Max Continuous Speed (rpm) | Max Continuous Pressure (MPa) |
|---|---|---|---|---|---|
| BM6-195 | 195.7 | 560 | 840 | 745 | 20 |
| BM6-245 | 246.2 | 705 | 1,060 | 590 | 20 |
| BM6-315 | 311.7 | 892 | 1,325 | 466 | 20 |
| BM6-390 | 391.4 | 1,120 | 1,625 | 370 | 20 |
| BM6-490 | 491.0 | 1,410 | 1,870 | 300 | 20 |
| BM6-630 | 623.2 | 1,550 | 1,900 | 235 | 17.5 |
| BM6-800 | 802.6 | 1,580 | 1,700 | 182 | 14 |
| BM6-985 | 982.0 | 1,850 | 1,850 | 150 | 14 |
Data source:
Selection rule of thumb: Calculate the required drive torque at the output shaft under worst-case conditions - maximum load, steepest grade, or heaviest cut. Then match to the BM6 model that delivers that torque at your available flow rate. Choose the smallest displacement that meets your torque requirement - this gives you the highest possible output speed for your application.
Critical operating note: Do not operate the motor at maximum pressure and maximum speed simultaneously. The continuous pressure rating is the differential pressure across the motor (port A to port B). Intermittent ratings apply for 6 seconds per minute maximum.
2. Geroler Disc Valve Design – High Starting Torque, Smooth Low-Speed Operation
The BM6's inserted tooth stator and rotor (Geroler) gear set is the foundation of its performance characteristics.
What this means for your application:
High starting torque - the Geroler geometry develops torque immediately on startup, without the lag that affects vane and piston motor designs. This is essential for machines that must accelerate a load from rest - a mini excavator beginning a travel cycle, or a winch lifting a load.
Smooth low-speed rotation - the disc valve distribution system maintains steady rotation even at low speeds, which is critical for winch positioning, conveyor speed control, and precise travel movements.
Automatic wear compensation - the disc valve plate automatically adjusts for wear during operation. Volumetric efficiency remains high over thousands of operating hours, without manual adjustment or rebuild.
3. Heavy-Duty Bearings – Direct Load Drive Without Additional Support
The BM6's output shaft is supported by heavy-duty tapered roller bearings that permit high radial and axial forces. This design allows the motor to drive a load directly - the motor shaft couples directly to the driven component (sprocket, wheel hub, or drum) without an intermediate bearing housing.
Practical benefit: Fewer components in the drive train, simpler installation, and one less bearing to maintain. For mini excavator travel drives and skid steer wheel motors, the motor itself carries the side load - no separate pillow block bearing required.
4. OEM Interchange – Drop-In Replacement for Danfoss OMT, Eaton 6K, and M+S EPMT
The BM6 series is designed as a direct interchange for the following motor platforms:
| BM6 Model | Danfoss OMT | Eaton Char-Lynn 6K | M+S EPMT |
|---|---|---|---|
| BM6-195 | OMT160/200 | 6K-195 | EPMT-200 |
| BM6-245 | OMT250 | 6K-245 | EPMT-250 |
| BM6-315 | OMT315 | 6K-315 | EPMT-315 |
| BM6-390 | OMT400 | 6K-390 | EPMT-400 |
| BM6-490 | OMT500 | 6K-490 | EPMT-500 |
| BM6-630 | - | 6K-625 | - |
| BM6-800 | - | 6K-800 | - |
| BM6-985 | - | 6K-985 | - |
What this means for you: If your machine currently uses a Danfoss OMT, Eaton 6K, or M+S EPMT motor, the BM6 series is a drop-in replacement with the same mounting dimensions, shaft configuration, and port layout. No adapter plates, no modified couplings, no re-plumbing.
5. Cast Iron Housing – Durability Where It Counts
The BM6 uses a high-strength cast iron housing - not aluminum. For machines operating in dusty, high-vibration environments, cast iron offers:
Higher burst pressure resistance - critical for heavy-duty drive circuits
Better vibration damping - reduces gear noise and housing fatigue
Thermal stability - less distortion under temperature swings
Corrosion resistance - adapts to harsh outdoor and industrial environments
Q1: How do I choose between the eight BM6 models?
The selection is driven by your required output torque and available flow rate:
Calculate required torque - determine the torque needed at the output shaft under worst-case load conditions.
Check available flow - what flow (L/min) can your hydraulic system deliver to the motor?
Match displacement - select the smallest BM6 model that delivers the required torque at your available flow.
Verify speed - confirm the motor's continuous speed rating at your flow rate is appropriate for the application.
Example: A mini excavator travel drive requires 1,200 N·m of torque at 300 rpm. Available flow is 140 L/min. Using the BM6 table, the BM6-490 delivers 1,410 N·m continuous torque at 300 rpm - a suitable match with adequate torque margin.
Q2: What are the maximum pressure and flow ratings?
Maximum continuous pressure differential: 20 MPa for BM6-195 through BM6-490; 17.5 MPa for BM6-630; 14 MPa for BM6-800 and BM6-985
Maximum continuous flow: 150 L/min across all models
Maximum intermittent flow: 170–225 L/min depending on model
Important: The pressure rating is the differential pressure across the motor (port A to port B), not the absolute system pressure. Intermittent pressure ratings apply for 6 seconds per minute maximum.
Q3: Can the BM6 be used in series or parallel circuits?
Yes. The BM6 is designed for series or parallel use in hydraulic systems. The motor's shaft seal design permits a maximum back pressure of up to 10 MPa, which allows it to operate in series circuits where the return oil from one motor feeds the inlet of the next.
Q4: What is the difference between continuous, intermittent, and peak ratings?
Continuous - the maximum value the motor can sustain indefinitely.
Intermittent - the maximum value for 6 seconds per minute.
Peak - the maximum value for 0.6 seconds per minute.
Practical guidance: For continuous production equipment (excavators, harvesters, conveyors), operate at or below the continuous rating. Intermittent and peak ratings are reserved for brief overload conditions during startup or shock loading.
Q5: What hydraulic fluid and filtration are required?
Fluid: ISO VG 46 or VG 68 anti-wear hydraulic oil recommended. Filtration: Maintain fluid cleanliness to ISO 18/15 or better. Maximum operating temperature: 80°C.
Q6: What shaft and flange options are available?
The BM6 is available with:
Shaft types: Straight key shaft (φ40, flat key 12×8×63), splined shaft, tapered shaft
Mounting flanges: SAE-C 4-bolt square flange, standard 2-bolt flange
Port options: G 3/4 main ports, G 1/4 drain port; SAE O-ring ports available
Before ordering: Confirm the shaft type, flange pattern, and port size from your original motor. A motor with the correct displacement but the wrong mounting will not fit.
Q7: What should I check before installing a replacement BM6?
Four items before installation:
Displacement - Confirm the cm³/rev from the original nameplate. Using a different displacement will change machine speed and torque.
Mounting configuration - SAE-C square flange vs standard 2-bolt. The replacement must match the original interface.
Shaft type - Keyed vs splined; shaft diameter and key dimensions. A motor with the wrong shaft will not couple.
Rotation direction - The BM6 is bidirectional, but confirm the case drain port orientation matches your installation.
Q8: Do you provide test reports?
Yes. Each BM6 motor undergoes factory testing before shipment, including displacement verification, torque/pressure performance data, and internal leakage measurement. Test data and videos are available upon request.
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