TECHNICAL WHITE PAPER
HANJIU OMS Series
Orbital Motor
Danfoss OMS Compatible | Heavy Duty | Geroler Disc Valve Design
OMS 80 · 100 · 125 · 160 · 200 · 250 · 315 · 400 · 500
Shijiazhuang Hanjiu Technology Co., Ltd.
June 2025 | www.hjhydraulic.com
Table of Contents
Executive Summary................................................................................. 3
Chapter 1 OMS Series: Heavy-Duty Orbital Motor Technology................. 4
1.1 Geroler Gear Set with Disc Distribution Valve................................ 4
1.2 OMS vs OMR vs OMH: Performance Hierarchy.............................. 5
Chapter 2 HANJIU OMS Complete Technical Specifications....................... 6
2.1 Nine-Model Displacement Range.................................................. 6
2.2 Continuous and Intermittent Performance Data............................ 7
2.3 Pressure, Torque and Speed Envelope.......................................... 8
Chapter 3 Cross-Reference and Compatibility Guide................................ 9
3.1 HANJIU OMS vs Danfoss OMS Cross-Reference.............................. 9
3.2 Multi-Brand Interchangeability................................................... 10
Chapter 4 Spare Parts, Seal Kits and Service Solutions............................ 11
4.1 Core Spare Parts Catalog............................................................ 11
4.2 Maintenance Cost Optimization.................................................. 12
Chapter 5 Applications Across Industries............................................... 13
Chapter 6 Quality Assurance and Global Distribution............................. 15
Chapter 7 Ordering Guide and Technical Support................................... 17
Conclusion............................................................................................ 19
References............................................................................................ 20
Executive Summary
The HANJIU OMS series heavy-duty orbital hydraulic motor represents the pinnacle of gerotor-based power transmission technology, engineered for applications demanding maximum torque output, superior bearing capacity, and exceptional durability under the most extreme operating conditions. Featuring an advanced Geroler gear set with disc-type distribution valve, the OMS series delivers hydraulic power to the largest and most demanding mobile and stationary equipment worldwide. This white paper presents the complete HANJIU OMS product line encompassing nine displacement variants from OMS 80 through OMS 500, with comprehensive technical specifications, cross-reference data, and aftermarket support information.
Shijiazhuang Hanjiu Technology Co., Ltd. has engineered its OMS series orbital motors to achieve complete dimensional and performance interchangeability with the Danfoss OMS series, the globally recognized benchmark for heavy-duty hydraulic power transmission. With geometric displacements ranging from 80.5 cm³ to 476.5 cm³, maximum continuous pressure drop ratings of 175 bar (up to 205 bar on select models), and peak torque output reaching 1,091 Nm, HANJIU OMS motors provide a high-performance, cost-effective solution for OEM equipment manufacturers, hydraulic system integrators, and aftermarket service providers in construction, mining, forestry, marine, and heavy industrial sectors worldwide.
Keywords: HANJIU OMS orbital motor, heavy duty hydraulic motor, Danfoss OMS compatible, OMS 80 OMS 100 OMS 125 OMS 160 OMS 200 OMS 250 OMS 315 OMS 400 OMS 500, geroler orbital motor, disc valve hydraulic motor, low speed high torque hydraulic motor, construction machinery hydraulic motor, mining equipment hydraulic motor, hydraulic motor spare parts, orbital motor seal kit
Chapter 1 OMS Series: Heavy-Duty Orbital Motor Technology
1.1 Geroler Gear Set with Disc Distribution Valve
The HANJIU OMS series employs the advanced Geroler (Generated Roller) gear set design combined with a precision disc-type distribution valve, establishing a new standard for heavy-duty orbital hydraulic motor performance. The Geroler mechanism represents an evolution of the conventional gerotor principle, incorporating cylindrical rollers within the stator tooth pockets to create a rolling contact interface with the rotor. This design innovation delivers substantial performance benefits: rolling contact eliminates sliding friction between rotor and stator teeth, dramatically reducing mechanical wear and extending operational life; the roller elements distribute load across a larger contact area, enabling significantly higher torque transmission capacity; and the Geroler construction tolerates extreme pressure differentials without component deformation or efficiency loss.
The disc-type distribution valve, mounted coaxially with the output shaft, replaces the conventional spool valve found in smaller orbital motors. This disc valve design provides precise hydraulic fluid timing with minimal leakage, ensuring optimal volumetric efficiency even at maximum pressure and minimum speed. The flat-disc configuration offers superior wear resistance compared to cylindrical spool designs, maintaining precise porting accuracy throughout the motor's extended service life. The integration of the disc valve with the shaft assembly eliminates external timing mechanisms and ensures reliable operation across the full speed range from near-zero to maximum rated rpm.
The OMS series housing is cast from high-strength nodular cast iron, providing exceptional structural rigidity to contain the high internal pressures generated during operation. The reinforced shaft bearings are specifically dimensioned to accommodate substantial radial and axial loads, enabling direct-drive installations in the most demanding applications without supplementary external bearing support. All shaft seals are available in standard and high-pressure configurations, with the high-pressure shaft seal (HPS) option capable of withstanding return line pressures up to 140 bar continuous without requiring an external drain connection.
1.2 OMS vs OMR vs OMH: Performance Hierarchy
Understanding the hierarchical relationship between the OMS, OMR, and OMH series enables equipment designers to select the optimal motor for each application tier. The OMS represents the heavy-duty pinnacle of Danfoss-compatible orbital motors, with structural and performance characteristics that substantially exceed both the OMR (medium-duty) and OMH (large-displacement) families:
● Pressure capability: OMS achieves 175 bar continuous pressure drop (up to 205 bar on OMS 80-160 models), compared to 140 bar for OMR and 115 bar for OMH 200, enabling substantially higher torque output per unit displacement
● Inlet pressure rating: maximum inlet pressure reaches 250 bar continuous and 300 bar peak for OMS, versus 210 bar for OMR and 225 bar for OMH, supporting operation in the most demanding hydraulic systems
● Torque output: continuous torque ranges from 226 Nm (OMS 80) to 870 Nm (OMS 315), with peak torque reaching 1,091 Nm, far exceeding OMR's maximum of 520 Nm
● Mounting flange options: OMS offers the most extensive flange selection including E2, E4, F6 rhombus, W wheel, E2B, SP square, D circle, and E square configurations, providing unmatched installation flexibility
● Shaft options: the widest range of shaft configurations including 25 mm, 32 mm, 25.4 mm, 31.75 mm cylindrical, SAE 6B splined, 14-DP splined, tapered 1:10 and 1:8, and sub-shaft options
● Bearing capacity: OMS shaft bearings are the largest in the orbital motor family, designed to sustain extreme radial loads from direct-drive wheels, drums, and winches without external support
● Port configurations: OMS supports G1/2 BSP, M22x1.5 metric, 7/8-14 UNF O-ring boss, and 1/2-14 NPTF port threads with G1/4, M14x1.5, and 7/16-20 UNF drain ports
Chapter 2 HANJIU OMS Complete Technical Specifications
2.1 Nine-Model Displacement Range
The HANJIU OMS series encompasses nine displacement models providing continuous torque from 226 Nm to 870 Nm, with each model engineered for specific heavy-duty application requirements. All nine models share common design architecture with interchangeable Geroler gear set technology, disc distribution valve, and reinforced housing construction. The product range is structured to cover heavy-duty applications from compact high-speed drives through the largest low-speed, high-torque installations:
| OMS 80 | OMS 100 | OMS 125 | OMS 160 | OMS 200 | OMS 250 | OMS 315 | OMS 400 | OMS 500 |
| 80.5 cm³ | 100.5 cm³ | 126.3 cm³ | 160.8 cm³ | 200.9 cm³ | 252.6 cm³ | 321.5 cm³ | 401.9 cm³ | 476.5 cm³ |
2.2 Continuous and Intermittent Performance Data
The following table presents verified performance specifications for all HANJIU OMS series orbital motors. Continuous ratings define sustained operation with normal service life expectancy. Intermittent ratings apply to peak loads not exceeding 10% of operating cycle time. Peak ratings apply for maximum 1% of every minute. All data measured with ISO VG 46 mineral hydraulic oil at 50°C:
| Model | Disp. | Speed | Speed | Torque | Torque | Press. | Press. | Press. | Flow | Power |
| (cm³) | Cont. | Int. | Cont. | Int. | Cont. | Int. | Peak | (L/m) | (kW) | |
| OMS 80 | 80.5 | 810 | 1000 | 226 | 293 | 175 | 210 | 250 | 65 | 16 |
| OMS 100 | 100.5 | 750 | 900 | 282 | 365 | 175 | 210 | 250 | 75 | 18 |
| OMS 125 | 126.3 | 600 | 720 | 355 | 459 | 175 | 210 | 250 | 75 | 18 |
| OMS 160 | 160.8 | 470 | 560 | 451 | 559 | 175 | 210 | 225 | 75 | 16 |
| OMS 200 | 200.9 | 375 | 450 | 564 | 672 | 175 | 200 | 225 | 75 | 14 |
| OMS 250 | 252.6 | 300 | 360 | 684 | 845 | 175 | 200 | 225 | 75 | 12.5 |
| OMS 315 | 321.5 | 240 | 285 | 870 | 1032 | 175 | 200 | 225 | 75 | 11.5 |
| OMS 400 | 401.9 | 190 | 230 | 813 | 1021 | 140 | 200 | 225 | 75 | 10.5 |
| OMS 500 | 476.5 | 155 | 185 | 728 | 903 | 120 | 175 | 200 | 75 | 9 |
2.3 Pressure, Torque and Speed Envelope
The HANJIU OMS series delivers outstanding pressure capability across the entire product range. Maximum continuous pressure drop reaches 175 bar (20.5 MPa) for models OMS 80 through OMS 250, with the OMS 80-160 models extending this to 205 bar intermittent capability. The OMS 315 maintains 175 bar continuous with 200 bar intermittent, while the OMS 400 and OMS 500 provide 140 bar and 120 bar continuous respectively, reflecting their large-displacement, low-speed optimization.
Maximum operating speed varies inversely with displacement, from 810 rpm continuous for the OMS 80 down to 155 rpm continuous for the OMS 500. Intermittent speed ratings extend these limits by approximately 20% for short-duration overload. All models maintain a minimum stable speed of 5 to 10 rpm, ensuring smooth creep operation for precision positioning applications.
Maximum output power at continuous duty reaches 18 kW for the OMS 100, 125, and 160 models, declining to 9 kW for the OMS 500 as the performance envelope shifts toward torque-dominant applications. All models achieve high starting torque, averaging 85% to 90% of rated continuous torque at maximum pressure, ensuring reliable startup under full load. Maximum permissible inlet pressure reaches 250 bar continuous and 300 bar peak across the range, with return pressure capability of 140 bar continuous (with drain line) enabling closed-loop circuit operation.
Chapter 3 Cross-Reference and Compatibility Guide
3.1 HANJIU OMS vs Danfoss OMS Cross-Reference
HANJIU OMS series orbital motors (also marketed as BMS/BM3 in select regions) achieve verified dimensional and functional interchangeability with the Danfoss OMS series. The following cross-reference table provides direct model mapping for replacement, retrofit, and new equipment design:
| HANJIU | Danfoss | HANJIU BMS | Notes |
| OMS 80 | OMS 80 | OMS 80 | Direct replacement, all flanges and shafts |
| OMS 100 | OMS 100 | OMS 100 | Direct replacement, all flanges and shafts |
| OMS 125 | OMS 125 | OMS 125 | Direct replacement, all flanges and shafts |
| OMS 160 | OMS 160 | OMS 160 | Direct replacement, all flanges and shafts |
| OMS 200 | OMS 200 | OMS 200 | Popular for construction and mining |
| OMS 250 | OMS 250 | OMS 250 | Heavy-duty material handling |
| OMS 315 | OMS 315 | OMS 315 | Maximum torque OMS variant |
| OMS 400 | OMS 400 | OMS 400 | Large-displacement industrial |
| OMS 500 | OMS 500 | OMS 500 | Largest OMS displacement available |
Every HANJIU OMS motor undergoes 100% hydrostatic pressure testing at 1.5 times maximum rated pressure, performance validation measuring output speed, torque, and volumetric efficiency, and dimensional inspection confirming interchangeability with Danfoss OEM specifications. Mounting flange geometry, shaft configurations, port thread specifications, and overall envelope dimensions conform precisely to Danfoss standards, ensuring direct drop-in replacement.
3.2 Multi-Brand Interchangeability
Beyond Danfoss compatibility, HANJIU OMS series motors serve as direct replacements for the following major international brands:
● M+S Hydraulic (Bulgaria) MS and MSQ series heavy-duty orbital motors
● Eaton Char-Lynn 6000 series and H/MF series low speed high torque motors
● Parker / White Drive WS and WR series wheel motors
● SAM Brevini BGV and BGW series heavy-duty orbital motors
● Bosch Rexroth MCR5 and MCR10 series radial piston motors
● Intermot NHM and NAM series large orbital hydraulic motors
● Linde BMV and BMF series orbital motors
Chapter 4 Spare Parts, Seal Kits and Service Solutions
4.1 Core Spare Parts Catalog
HANJIU maintains a comprehensive inventory of genuine replacement components for the entire OMS series, supporting preventive maintenance programs and field repair operations:
| Part Description | HANJIU Code | Application |
| Complete Seal Kit (Standard) | SK-OMS-STD | All OMS models, standard shaft seal |
| Complete Seal Kit (HPS) | SK-OMS-HPS | All OMS models, high-pressure shaft seal |
| Geroler Set (Rotor + Stator + Rollers) | GS-OMS-XXX | Model-specific Geroler gear set |
| Disc Valve / Distributor | DV-OMS-STD | Standard disc valve, all models |
| Output Shaft (25 mm Cylindrical) | OS-OMS-C25 | Standard shaft option |
| Output Shaft (32 mm Cylindrical) | OS-OMS-C32 | Heavy-duty shaft option |
| Output Shaft (31.75 mm Splined) | OS-OMS-S6B | SAE 6B splined shaft |
| Output Shaft (Tapered 35 mm 1:10) | OS-OMS-T35 | Precision coupling applications |
| Shaft Seal (High Pressure) | SS-OMS-HPS | 140 bar return pressure capability |
| Wheel Flange Gasket | MF-OMS-W | W-type wheel mount flange |
4.2 Maintenance Cost Optimization
Selecting HANJIU OMS orbital motors and genuine spare parts delivers measurable economic advantages throughout the equipment ownership lifecycle:
● Acquisition cost reduction of 35% to 55% versus original Danfoss equipment, with verified equivalent performance and service life
● Complete seal kit replacement costs 40% to 60% below OEM levels, with all kits including precision-matched shaft seals, O-rings, and gaskets
● Standard delivery lead times of 1 to 7 days globally, with 24-hour emergency dispatch for critical requirements
● Total cost of ownership reduction of 25% to 35% through consistent parts availability, extended motor service life, and minimized downtime
● Complimentary technical consultation provided by qualified hydraulic engineers with average response time under 2 hours
Chapter 5 Applications Across Industries
The HANJIU OMS series heavy-duty orbital motor serves the most demanding applications across multiple industry sectors where maximum torque, robust bearing capacity, and proven reliability under extreme conditions are non-negotiable requirements.
5.1 Construction and Earthmoving Equipment
Construction machinery represents the largest application segment for OMS series orbital motors. Typical installations include hydraulic excavator swing drives for machines from 13 to 35 tons, wheel loader axle and wheel drives for large articulated loaders, backhoe loader loader arm and bucket drives, road roller drum vibration and propulsion systems, concrete pump truck slewing and boom drives, crane and aerial work platform lift and slew mechanisms, and drilling rig rotation heads. The OMS 125 through OMS 250 models predominate in construction applications, providing the torque and durability required for continuous-duty earthmoving and material handling operations in dusty, high-vibration environments.
5.2 Mining and Heavy Material Handling
Mining operations subject hydraulic components to the most punishing duty cycles imaginable. The OMS series powers underground LHD vehicle traction and bucket rotation drives, roof bolter drill head and feed mechanisms, continuous miner cutter head and traction systems, surface mining excavator and shovel swing drives, stacker-reclaimer boom luffing and slewing mechanisms, and port and terminal ship loader and unloader drives. The OMS 250, OMS 315, OMS 400, and OMS 500 models deliver the massive torque output required by these continuous-duty heavy material handling applications, often operating 24 hours per day, 365 days per year.
5.3 Forestry, Agriculture and Marine
In the forestry sector, OMS motors power log forwarder and skidder winch drives, harvester head rotation and feedroll systems, and delimber arm actuators. Agricultural applications include large forage harvester header and kernel processor drives, combine harvester reel and unloading auger systems, and large-scale irrigation system propulsion. Marine installations encompass anchor winch and windlass drives, capstan and mooring systems, commercial fishing net and longline haulers, deck crane rotation drives, and stern ramp and hatch cover actuators. The OMS's high return pressure tolerance (140 bar with drain line) makes it particularly well-suited to marine closed-loop hydraulic systems.
5.4 Industrial and Specialized Equipment
Industrial applications include heavy conveyor and bucket elevator drives, rotary drum mixer and blender drives for cement and minerals, large indexing table and positioning systems, plastic extrusion and injection mold handling, automated guided heavy vehicle propulsion, and steel mill auxiliary equipment including ladle tilters and slab turners. Specialized installations span tunnel boring machine cutter head and propulsion drives, offshore platform crane and winch systems, wind turbine blade pitch and yaw drives, hydroelectric dam gate actuators, and military vehicle turret and weapon platform drives. The OMS 200 and OMS 315 are the most commonly specified models for industrial heavy-duty applications.
Chapter 6 Quality Assurance and Global Distribution
HANJIU Technology operates a state-of-the-art manufacturing facility in Shijiazhuang featuring precision CNC machining centers, automated Geroler gear set production lines, computerized assembly stations, and comprehensive testing and validation equipment. The quality management system is certified to ISO 9001:2015 standards, with CE marking compliance for all products supplied to European markets.
● 100% hydrostatic pressure testing: every OMS motor is pressure-tested at 1.5 times maximum rated working pressure to verify housing integrity, seal performance, and absence of leakage
● Performance validation: output speed, torque, and volumetric efficiency are measured and recorded for each production unit against specification tolerances
● Dimensional verification: precision measurement using coordinate measuring machines confirms interchangeability with Danfoss OEM dimensions
● Material traceability: nodular cast iron housings, alloy steel shafts, and precision Geroler sets sourced from qualified suppliers with full lot traceability
● Warranty coverage: 12-month warranty against defects in materials and workmanship under normal operating conditions
The global distribution network serves customers in more than 80 countries through authorized dealers, OEM direct accounts, and aftermarket distributors. Strategic regional warehouse locations ensure delivery times of 1 to 7 days for standard orders. HANJIU's commitment to quality, competitive pricing, and responsive service has driven consistent double-digit annual growth in international export volumes.
Chapter 7 Ordering Guide and Technical Support
7.1 Selection Procedure
Specifying the correct HANJIU OMS orbital motor follows a systematic engineering procedure:
● Step 1: Calculate required output torque including application service factor (typically 1.5 to 2.0 for mining and construction equipment)
● Step 2: Determine available system working pressure and confirm motor pressure rating adequacy
● Step 3: Calculate required hydraulic flow rate: Q = Vg x n / 1000 (L/min)
● Step 4: Verify that calculated speed, flow, and pressure all fall within the motor's continuous duty envelope
● Step 5: Select mounting flange (E2, E4, F6, W, E2B, SP, D, or E), shaft type (cylindrical, splined, or tapered), and port configuration
● Step 6: Specify shaft seal (standard or high-pressure HPS) based on expected return line back pressure
7.2 Technical Support Channels
HANJIU Technology provides comprehensive technical support through multiple channels: direct telephone consultation during extended business hours; email technical inquiry with guaranteed response within 2 hours; complete technical documentation including datasheets, installation manuals, troubleshooting guides, and hydraulic schematic diagrams available for download; video technical support and remote diagnostic assistance for complex challenges; and on-site field service for major OEM accounts and distribution partners. The technical support team comprises qualified hydraulic engineers with decades of combined experience across construction machinery, mining equipment, agricultural systems, marine hydraulics, and heavy industrial applications.
Conclusion
The HANJIU OMS series heavy-duty orbital hydraulic motor delivers proven maximum-performance power transmission for the most demanding applications across construction, mining, forestry, agriculture, marine, and heavy industrial sectors. With nine displacement models from OMS 80 to OMS 500 delivering geometric displacements from 80.5 cm³ to 476.5 cm³, continuous torque output to 870 Nm, peak torque to 1,091 Nm, maximum pressure drop ratings of 175 bar (up to 205 bar on select models), and complete dimensional interchangeability with the Danfoss OMS series, HANJIU addresses the full spectrum of heavy-duty hydraulic power transmission requirements.
The Geroler gear set mechanism, disc-type distribution valve, reinforced housing construction, oversized shaft bearings, and extensive mounting and shaft options position the OMS series as the motor of choice for the largest and most demanding mobile and stationary hydraulic equipment. Combined with extensive spare parts availability, competitive lifecycle costs, and responsive global technical support, HANJIU OMS orbital motors deliver tangible value that strengthens OEM competitiveness and reduces operating costs for the most challenging equipment fleets worldwide.
References
[1] Danfoss Power Solutions. OMS, OMT and OMV Orbital Motors Technical Information [151-1013]. 2011.
[2] Danfoss Power Solutions. OMS Technical Data and Function Diagrams [151F0500 through 151F0508]. 2023.
[3] Danfoss Power Solutions. OMS Dimensions European and US Versions. 2023.
[4] White Drive Products. OMS Orbital Motor Technical Information. 2025.
[5] Shijiazhuang Hanjiu Technology Co., Ltd. HANJIU OMS Series Orbital Motor Product Catalog. 2024.
[6] Shijiazhuang Hanjiu Technology Co., Ltd. Model Cross Reference Guide: HANJIU OMS vs Danfoss, Eaton, M+S. 2024.
[7] ISO 9001:2015. Quality Management Systems - Requirements. International Organization for Standardization.
[8] Directive 2006/42/EC. Machinery Directive. European Parliament and Council.
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