Danfoss OMS Series Orbit Motor | OMS80 151F2377 OMS100 151F2378 Hydraulic Motor

The OMS Series high-performance hydraulic orbit motors manufactured by Chengyuan Hydraulic are premium low-speed high-torque (LSHT) fluid power units fully compatible with Danfoss (formerly Sauer-Danfoss) mobile and industrial heavy-duty machinery standards. Utilizing an advanced independent disc valve distribution system combined with a robust Geroler gear set profile, this series is engineered to master grueling applications that demand prolonged operational life, high system backpressure, and frequent high-frequency directional shifting cycles. For exact factory designations like OMS80 (151F2377), OMS100 (151F2378), and the extra-capacity OMS500 (151F2376), we employ reinforced tapered rolling elements and specialized high-pressure shaft seals. Every single motor undergoes 100% simulated full-load dynamic torque profiling and casing leakage calibration prior to shipment to ensure rock-solid start-up torque, delivering proven 100% original-place interchangeability.

Technical Specifications :

• Series Designation: Danfoss OMS Series (Design Code 3 Series Compatible)

• Factory Order References: 151F2377 (OMS 80) / 151F2378 (OMS 100) / 151F2376 (151F2376)

• Displacement Rating Volumetrics:

  • OMS 80: 80.5 $cm^3/rev$ (4.91 $in^3/rev$)

  • OMS 100: 100.0 $cm^3/rev$ (6.10 $in^3/rev$)

  • OMS 500: 500.9 $cm^3/rev$ (30.57 $in^3/rev$)

• Continuous Operating Pressure: OMS 80 / OMS 100: 210 bar (3045 psi); OMS 500: 110 bar (1600 psi)

• Intermittent Max Pressure Limits: OMS 80 / OMS 100: 230 bar (3335 psi); OMS 500: 125 bar (1810 psi)

• Peak Pressure Transient Threshold: OMS 80 / OMS 100: up to 295 bar (4280 psi) instantaneous spike

• Maximum Continuous Speeds: OMS 80: 810 rpm; OMS 100: 750 rpm; OMS 500: 155 rpm

• Maximum Rated Power Output: OMS 80: 15.5 kW; OMS 100: 18.0 kW; OMS 500: 11.0 kW

• Maximum Output Torque Multipliers: OMS 80: 240 N·m (Cont.); OMS 100: 305 N·m (Cont.); OMS 500: 730 N·m (Cont.)

• Drive Shaft & Mount Interfacing: Standard 32mm cylindrical keyed shaft or premium SAE splined configurations with standard SAE 4-bolt pilot diamond flanges

• Quality Assurance Auditing: 100% dynamically verified for volumetric seal drop and load torque parity

Key Technical Advantages:

• High-Durability Geroler Rollers Topology: The displacement gear set profile incorporates precision-ground, hardened internal roller pins. By converting rough sliding friction into smooth rolling contact, this design completely eliminates low-speed slip-stick stutter (“crawling”) while heavily retarding component face wear under massive high-load torque delivery.

• Hydrostatic Axial Self-Balancing Disc Valve: The timing distribution disc valve operates independently from the main drive link and is held securely against the plate manifold face via an integrated hydraulic balancing chamber. As system temperatures rise and oil thins, it actively tightens axial clearances, capturing fluid bypass and maintaining volumetric efficiency over 90%.

• Oversized Tapered Roller Shaft Bearings: Outfitted with large-capacity dual tapered roller bearings supporting the main drive shaft hub. This heavy-duty assembly absorbs high radial and axial overhung forces. This allows the OMS motor to directly drive heavy external chain sprockets, gears, or belt pulleys without needing auxiliary pillow block bearings.

• Premium High-Pressure Dual-Lip Shaft Seals: Equipped with an imported high-integrity shaft seal system that manages high internal casing pressures (up to 210 Bar under optimal speeds) without an external case drain line. This layout is perfect for space-constrained mobile platforms or closed-loop hydrostatic drives.

Application Areas:

• Municipal Sweepers & Road Maintenance: Primary propulsion for sweeping brush cylinders, industrial asphalt milling machines, and salt/sand spreader spin tables.

• Heavy Harvesters & Agricultural Implements: Reel speed control circuits for large grain combines, agricultural mower head cutting loops, and feeding rolls on timber processors.

• Industrial HPUs & Conveyor Automation: Primary drive torque for mobile hydraulic winches, industrial belt conveyors, injection molding machine screw drives, and compact cement mixer drums.

Expert Maintenance Tips:

• Overrunning Cavitation Protection Mandatory Directive: For systems operating high-inertia overrunning loads like sweeper broom drums or winches, the motor will act as a “pump” if the main valve block suddenly clips back to center. To prevent destructive vacuum cavitation damage within the Geroler chambers, a dual dual-direction cross-port relief or make-up bypass valve layout is non-negotiable.

• Mandatory External Case Drain Line Protocol: Despite the motor’s high shaft seal pressure rating, if multiple OMS80 or OMS100 units are operated in a series circuit configuration, or if your main return line experiences dynamic backpressure peaks continuously above 20 Bar, you must pipe an independent case drain lines from the housing directly back to the main reservoir. This guarantees thermal fluid flushing to cool the bearings and extend seal elasticity.

• Cold Start De-Aeration Pre-Commissions: After swapping a motor and replenishing the loop fluid, never stress the motor with full-load or max RPM right out of the gate. Jog the motor smoothly in both forward and reverse under zero load for 5 to 10 minutes. This purges trapped air pockets from the distribution valve and Geroler tracks, eliminating catastrophic micro-cavitation diesel-burn tracking on internal faces.