OMT500FH Danfoss Orbital Motor 523.6cc 210 Bar Interchange

Product Overview

The OMT500FH is a 500-size large low-speed high-torque orbital hydraulic motor from the Danfoss OMT Series, featuring a geometric displacement of 523.6 cm³/rev (31.95 in³/rev), Geroler gear set technology, and disc valve flow distribution. The OMT Series is the large-frame workhorse of the Sauer Danfoss orbital motor lineup, spanning displacements from 161.1 to 523.6 cm³/rev with continuous output torque up to 1220 N·m, intermittent torque up to 1370 N·m, and peak torque reaching 1643.8 N·m.

Key technical features of the OMT500FH include: Geroler gear set technology that replaces sliding contact with rolling contact for reduced friction losses and extended service life; a disc valve distribution system (disc valve with valve drive) that maintains stable volumetric efficiency under high-pressure conditions, with the valve plate hydraulically loaded against the rotor face to provide automatic wear compensation. The output shaft is supported by front and rear double-row tapered roller bearings for high radial load capacity. The motor features a 4-bolt square mounting flange with standard 40 mm cylindrical or 1-1/2″ splined shaft configurations.

As a direct interchange unit for the Danfoss OMT Series, the OMT500FH is dimensionally compatible with OEM Danfoss motors in mounting flange, shaft extension, and port layout. It serves as a drop-in replacement for equivalent OMT Series motors and is cross-compatible with Eaton, Parker, and M+S LSHT motors of similar displacement. Every unit undergoes 100% simulated operating condition testing prior to shipment, verifying displacement accuracy, pressure integrity, and torque output consistency.

Technical Specifications 

• Model: OMT500FH (also available: OMT160 / OMT200 / OMT250 / OMT315 / OMT400 / OMT630 / OMT800)

• Brand Series: Danfoss OMT Series (Large LSHT)

• Motor Type: Disc valve orbital hydraulic motor

• Gear Set Type: Geroler

• Geometric Displacement: 523.6 cm³/rev (31.95 in³/rev)

• Maximum Continuous Speed: 240 rpm

• Maximum Intermittent Speed: 285 rpm

• Maximum Continuous Torque: 1220 N·m

• Maximum Intermittent Torque: 1370 N·m

• Maximum Peak Torque: 1643.8 N·m

• Maximum Continuous Pressure Drop: 160 bar

• Maximum Intermittent Pressure Drop: 180 bar

• Maximum Peak Pressure Drop: 210 bar

• Maximum Continuous Output Power: 26.5 kW

• Maximum Intermittent Output Power: 30.0 kW

• Maximum Continuous Flow: 125 L/min

• Mounting Flange: 4-bolt square flange, pilot dia. 125 mm, bolt circle dia. 160 mm

• Output Shaft: 40 mm cylindrical / 1-1/2″ splined (17T) optional

• Main Port: G 3/4 (BSP) side port

• Drain Port: G 1/4 (BSP)

• Bearing Type: Double-row tapered roller bearings (front & rear)

• Weight: Approximately 23 kg

Sources: Danfoss OMT 500 official technical data and product specifications.

Key Technical Advantages

1. Geroler Gear Set with Disc Valve — Volumetric Efficiency at High Pressure

The OMT500FH employs Geroler gear set technology in which the rotor tooth profile makes rolling contact with the stator ring through embedded rollers, significantly reducing the coefficient of friction and controlling internal leakage compared to conventional orbital motor architectures. The disc valve distribution system creates a pressure-compensating sealing interface between the valve plate and rotor face, maintaining stable volumetric efficiency at 210 bar peak pressure. The valve plate is hydraulically loaded against the rotor face, automatically compensating for wear and ensuring consistent torque output throughout the motor’s service life.

2. Double-Row Tapered Roller Bearings — Reliable Heavy Radial Load Capacity

The OMT500FH output shaft is supported by front and rear double-row tapered roller bearings, delivering significantly higher radial load capacity and rigidity compared to the plain sleeve bearings or single-row ball bearings commonly used in competing orbital motors of the same displacement class. This design enables the motor to accommodate the elevated radial forces generated by gear drives, belt drives, and other indirect drive configurations, as well as wheel-mounted travel drive applications. Bearing clearance is precisely adjusted to ensure smooth operation under heavy loads.

3. Wide Displacement Coverage and Series Interchangeability — One-Stop Drive Solution

The OMT Series offers complete displacement coverage from 161.1 to 523.6 cm³/rev, with all models in the series sharing consistent mounting flange, shaft extension, and port layout dimensions, enabling equipment manufacturers to flexibly select motors across different machine models. As the largest displacement model in the series, the OMT500FH shares the same design platform and mounting interface with OMT160, OMT200, OMT250, OMT315, and OMT400 models, eliminating the need to redesign hydraulic systems during equipment upgrades or retrofits.

4. High Back Pressure Tolerance and System Integration Flexibility

The OMT500FH sealing system is engineered to tolerate return line back pressure, making it suitable for series circuits and multi-motor loops. The motor features a 4-bolt square mounting flange with 125 mm pilot diameter and 160 mm bolt circle diameter, providing high mounting rigidity capable of withstanding frequent reversing shock loads and pressure fluctuations. Main ports are G 3/4 BSP side ports with a G 1/4 drain port, offering flexible and convenient plumbing configurations.

Application Areas

• Agricultural Machinery: Combine header drives, baler drives, planter drives, irrigation hose reel drives

• Construction Equipment: Excavator travel drives, crane hoist drives, rotary drilling rig power head drives

• Material Handling: Conveyor drives, winch drives, forklift travel drives

• Forestry Equipment: Wood chipper drives, skidder drives, feller buncher drives

• Mining Equipment: Drill rig drives, coal mine conveyor drives

• Fishing & Marine: Net hauling winch drives, windlass motors, deck machinery

• Specialty Vehicles: Street sweeper drives, snow removal equipment drives, aerial work platform wheel drives

Expert Maintenance Tips

Installation Guidelines:

• The OMT500FH uses a 4-bolt square flange mount. Tighten flange bolts in a diagonal alternating pattern to ensure even loading. The 125 mm pilot diameter mating surface must be clean and undamaged to prevent housing distortion from an uneven mounting face.

• The output shaft is a 40 mm cylindrical or 1-1/2″ splined shaft. Apply a thin film of grease to the shaft extension before coupling installation to prevent keyway or spline damage. Never install couplings by impact or hammering.

• Use G 3/4 BSP standard fittings for main ports and G 1/4 for the drain port. Verify O-rings are intact and correctly seated, and tighten to Danfoss-specified torque values.

Commissioning & Operation:

• Before first startup, fill the motor case with clean hydraulic oil and bleed air. Maximum system operating oil temperature must not exceed 80°C.

• Use anti-wear hydraulic oil with viscosity range 20–300 cSt. Maintain fluid cleanliness at ISO 18/13 (NAS Class 9) or better.

• Before full-load operation, run the motor at 30% of rated pressure for a minimum of 1 hour to complete the run-in process.

• Maximum continuous differential pressure is 160 bar; intermittent pressure must not exceed 180 bar; peak pressure must not exceed 210 bar with a maximum duration of 6 seconds per cycle.

• If system back pressure exceeds shaft seal limits, install an external case drain line. The drain line should maintain back pressure to ensure the motor remains filled with hydraulic oil.

Maintenance Schedule:

• Inspect volumetric efficiency performance every 500 operating hours. If torque output declines or speed becomes unstable, inspect the valve plate sealing surface and Geroler gear set wear condition first.

• Replace hydraulic fluid at intervals not exceeding 2000 operating hours or 12 months, whichever comes first. Clean or replace suction and return filter elements concurrently during oil changes.

• For storage exceeding 3 months, fill the motor with rust-preventive hydraulic oil and cap all ports to prevent internal corrosion.