OMP Hydraulic Motor | Danfoss OMP100 OMP200 OMP400 Replacement

Genlu Hydraulic stands as a premier enterprise in the R&D, structural engineering, and global logistics of high-capacity industrial and mobile-grade low-speed high-torque (LSHT) hydraulic orbit motors. The OMP Series Light-to-Medium Duty Orbit Hydraulic Motor is purposefully manufactured as a robust, micro-engineered, and 100% drop-in interchangeable alternative to the global fluid industry benchmark Danfoss classic OMP / OMPS (shaft-distribution layout, 151- prefix series) universal orbital lines. We manage complete inventory and tailored procurement matrices for all definitive frame displacements and standard manufacturer part numbers, prominently delivering replacement builds for OMP100, OMP125, OMP160, OMP200 (Part Number: 151-0335), OMP250, OMP315, and OMP400 (Part Number: 151-0618).

Across applications ranging from automated warehouse food conveyors to rugged agricultural field implements, the smooth delivery of low-rpm torque, cross-port leakage control, and the back-pressure resistance of the dynamic shaft seal define a machine’s service lifecycle. Genlu’s OMP series orbit motors align precisely with original product manuals. We guarantee flawless mechanical interchangeability across standard SAE 2-bolt oval mounting flanges, Ø25 mm cylindrical parallel keyed shaft extensions, and standard BSPP/UNF fluid ports. Prior to dispatch authorization, every single motor undergoes 100% Full-Simulation Condition Testing on automated diagnostic bays to guarantee structural reliability and out-of-the-box system uptime.

Technical Specifications 

• Product Line: OMP Series Universal Spool Valve Hydraulic Orbit Motor (Fully compatible with Danfoss 151- platforms)

• Core Covered Models & Part Numbers:

  • OMP100 Layout (Geometric Displacement: 100.0 $cc/rev$)

  • OMP125 Layout (Geometric Displacement: 125.0 $cc/rev$)

  • OMP160 Layout (Geometric Displacement: 160.0 $cc/rev$)

  • OMP200 Layout (Part Number: 151-0335, Geometric Displacement: 200.0 $cc/rev$)

  • OMP250 Layout (Geometric Displacement: 250.0 $cc/rev$)

  • OMP315 Layout (Geometric Displacement: 315.0 $cc/rev$)

  • OMP400 Layout (Part Number: 151-0618, Geometric Displacement: 400.0 $cc/rev$)

• Continuous Rated Operating Pressure: 100 bar to 140 bar (1450 psi to 2030 psi, depending on selected displacement size)

• Maximum Intermittent Peak Pressure: 140 bar to 175 bar (14.0 MPa to 17.5 MPa / 2538 psi)

• Continuous Rated Output Torque: From 220 $N\cdot m$ (OMP100) up to 360 $N\cdot m$ (OMP400)

• Maximum Permissible Continuous Flow Feed: 60 $L/min$ (adjusted according to OMP315/400 limits)

• Maximum Continuous Rotational Velocity: 150 rpm (OMP400) up to 600 rpm (OMP100)

• Fluid Distribution Configuration: Spool Valve Geometry (Integrated main shaft distribution)

• Output Drive Shaft Profiles: Ø25 mm cylindrical straight shaft with parallel flat key (8x7x32 mm, matching 151-0335 & 151-0618 standards)

• Main Fluid Connection Interfaces: Side ports configured with G 1/2″ standard BSPP threads or 7/16-20 UNF independent case drain ports

• Mounting Flange Specification: Standard SAE A 2-bolt oval pilot (Bolt Circle Distance: 106.4 mm, Pilot Diameter Location: Ø82.5 mm)

Key Technical Advantages:

• Optimized Gerotor Gear Set Geometry: Compared to basic, low-cost alternatives, Genlu’s gerotor profile curves are fine-tuned using computer-aided fluid dynamics. This optimization significantly lowers pressure spikes when switching directions, ensuring excellent rotational stability down to 10 rpm without the low-speed stick-slip “cogging” common in lesser motors.

• High-Pressure Composite Shaft Sealing System: Outfitted with a premium, fluorinated elastomer shaft seal assembly. Even if return line friction or multi-motor series arrangements cause transient back-pressures to spike up to 50–70 bar, this seal provides reliable, leak-free isolation and minimizes the risk of extrusion when running without an external case drain.

• Hardened Alloy Steel Cardan Drive Linkage: The motor’s internal cardan shaft is machined from high-grade chromium-molybdenum alloy steel, which undergoes full induction hardening and precision gear grinding. This process yields excellent torsional fatigue limits, ensuring the teeth transfer power cleanly without stripping or distorting during rapid, high-frequency reversals.

• High-Damping Cast Iron Monoblock Casing: The main housing is cast from high-density HT250 gray iron in a one-piece mold. The smooth internal flow paths minimize fluid restriction and flow resistance to optimize mechanical efficiency. At the same time, the material’s natural vibration-damping properties help suppress structural noise and axial chatter during operation.

Application Areas:

• Agricultural Equipment & Specialized Implements: Direct drive components for combine harvester reel headers, automated vacuum seeder meters, organic fertilizer spinners, and crop sprayer auxiliary pumps.

• Industrial Material Conversion & Packaging Automation: Integrated drive rollers for light-duty warehouse belt conveyors, indexing rotary tables on automated labeling machines, and chemical blending or liquid mixing paddles.

• Municipal Cleaners & Maintenance Fleet: Primary rotational source for municipal sweeper side-brooms and vehicle-mounted utility self-recovery hydraulic winch assemblies.

Expert Maintenance Tips:

• Strict Verification of Port Thread Geometry per 151- Suffix Assignment: Different Danfoss OMP200 configurations, such as 151-0335, feature specific fluid connection standards, including imperial BSPP G1/2″ threads or US UNF O-ring style ports. Always verify the thread pitch and port diameter with calipers before installing fittings—never force an unmatched connector into place. Forcing a mismatched fitting can crack the port casting under high pressure and cause external fluid leaks.

• Utilize the Independent Case Drain for Series Configurations: Although the OMP shaft seal is built to handle significant back-pressure, we strongly recommend opening the independent case drain port and routing a separate line directly to the reservoir if multiple motors are plumbed in series or if return lines are long and generate constant back-pressures over 20 bar. This keeps the internal bearing cavity unpressurized and extends seal life.

• Mandatory Pre-Lubrication & Initial Jogging Routine: Before connecting the mechanical load or engaging high-pressure power for the first time, pour approximately 50-100 ml of clean, filtered system hydraulic oil directly into the motor’s ports. For initial commissioning, jog the motor under zero load (alternating 2 seconds on, 5 seconds off) for 1–2 minutes to purge trapped air from the internal cavities and protect the moving surfaces from dry-run scoring.