The OMR / OMRS hydraulic motor is a fixed-displacement orbital (Geroler) motor designed for medium-duty mobile and industrial hydraulic systems. Featuring an advanced Geroler gear set with shaft distribution flow, this motor provides smooth operation, high efficiency, low starting pressure, and long service life.
The OMR/OMRS series is widely used in agricultural machinery, construction equipment, plastic processing systems, conveyors, winches, sweepers, and other hydraulic drive applications requiring reliable torque output and compact installation.
Key Features of the OMR / OMRS Orbital Hydraulic Motor
1. Advanced Geroler Gear Design
The motor adopts a precision-manufactured Geroler gear set that:
Enables low starting pressure
Ensures smooth and stable rotation
Improves volumetric efficiency
Extends operational lifespan
This design automatically compensates under high-pressure conditions, maintaining consistent performance.
2. High Back Pressure Shaft Seal
The OMRS variant supports higher back pressure capability, allowing:
Parallel hydraulic circuit configurations
Series hydraulic system integration
Flexible installation in complex machinery
3. Optimized Distribution System
A specially engineered oil distribution structure reduces:
Hydraulic pulsation
Operating noise
Internal wear
This results in stable torque output and improved system reliability.
4. Compact Structure & Easy Installation
Compact housing design
2-bolt, 4-bolt, and square flange options
Multiple shaft configurations (25mm, 25.4mm, spline or key)
Metric, European, and US port thread options
The motor integrates easily into both OEM systems and replacement applications.
Technical Specifications – OMR / OMRS Hydraulic Motor
Specification
Range
Displacement
36 – 375 cc/rev
Torque Range
50 – 420 Nm
Speed Range
20 – 1030 rpm
Pressure Range
10 – 16 MPa (continuous/intermittent depending on model)
Flow Range
45 – 60 L/min
Maximum Power
Up to 15 kW
Weight
6.5 – 9.5 kg
Flange Options
2-bolt / 4-bolt / square flange
Common Shaft Sizes
25mm / 25.4mm (key or spline)
Available displacement models include: 36, 50, 80, 100, 125, 160, 200, 250, 315, and 375 cc.
Performance Advantages in Real-World Applications
Agricultural Machinery
Used in:
Mowers
Harvesters
Feed mixers
Seeder drives
The OMR motor provides stable torque under variable field loads.
Construction & Mining Equipment
Applied in:
Augers
Small winches
Conveyor drives
Rotary platforms
Its compact build and durable design perform reliably in dusty and high-vibration environments.
Plastic & Industrial Machinery
Commonly used in:
Injection molding auxiliary drives
Cleaning systems
Conveyor systems
The motor’s smooth output ensures precision motion control.
Municipal & Utility Vehicles
Suitable for:
Sweeper drives
Brush motors
Auxiliary hydraulic systems
The OMRS high back-pressure seal improves system compatibility.
How to Select the Right OMR / OMRS Hydraulic Motor
Choosing the correct orbital hydraulic motor requires evaluating:
1. Required Torque
Calculate load torque requirements and select displacement accordingly. Higher displacement = higher torque at lower speed.
2. Operating Speed
Determine the required RPM range to match system flow capacity.
3. System Pressure
Ensure working pressure does not exceed continuous pressure ratings.
4. Mounting & Shaft Compatibility
Verify:
Flange pattern
Shaft diameter
Key or spline type
Port thread standards
5. Circuit Configuration
If high back pressure exists, OMRS models are recommended.
Proper motor selection directly impacts:
System efficiency
Service life
Maintenance frequency
Energy consumption
Maintenance & Best Practices
Although orbital motors are mechanically simple, preventive maintenance is essential.
Essential Maintenance Guidelines
Routine inspection for leakage, abnormal noise, or vibration
Maintain clean hydraulic fluid to prevent internal wear
Check seals and bearings periodically
Ensure proper relief valve settings to avoid overpressure
Prevent cavitation by maintaining adequate suction conditions
Common Misconceptions
“Hydraulic motors require no maintenance.” Internal wear gradually increases leakage and reduces torque output.
“Replacing seals restores full performance.” If internal components are worn, performance loss will persist.
“Higher RPM means better performance.” Exceeding rated speed increases wear, noise, and heat.
“Pressure alone indicates motor health.” Torque depends on displacement and flow, not pressure alone.
Why Choose the OMR / OMRS Hydraulic Motor?
The OMR / OMRS series offers:
Wide displacement flexibility
Stable torque output
Compact structure
Long service life
Strong compatibility with global brands
Reliable performance in mobile and industrial applications
Its balance of efficiency, durability, and cost-effectiveness makes it a practical solution for OEM manufacturers and replacement markets worldwide.
Ready to Optimize Your Hydraulic Drive System?
Whether you are:
Designing new machinery
Upgrading existing equipment
Replacing imported orbital motors
Troubleshooting torque or efficiency issues
Selecting the correct OMR / OMRS hydraulic motor can significantly improve system reliability and reduce lifecycle costs.
For customized model recommendations, provide:
Required torque
Flow rate
Operating pressure
Speed range
Mounting and shaft specifications
A properly matched hydraulic motor ensures maximum efficiency, extended service life, and optimal performance across applications.
