Product Overview
The OMTS 315 151B3039 is a bearingless short-shaft low-speed, high-torque (LSHT) orbital hydraulic motor in Danfoss’s OMTS Series. The OMTS is the bearingless short version of the Danfoss OMT Series, designed for direct mounting on a gear or gearbox — eliminating the front bearing and output shaft to integrate the motor directly with the gearbox, ensuring smooth and steady operation at very low speed high torque.
The motor features a Geroler roller-type displacement mechanism with an independently driven, hydraulically balanced disc valve synchronized by a universal shaft, precisely controlling oil distribution to each working chamber to minimize hydraulic and mechanical losses. The distribution face includes automatic wear compensation for sustained high volumetric efficiency over the long term. The OMTS 315 features a 16-tooth splined short shaft (16-DP12/24) that engages directly into the gearbox input spline bore, with a 4-φ14 circular flange (pilot φ125×8, bolt circle φ160 mm), suitable for both open and closed loop hydraulic systems.
The OMTS 315 151B3039 is a 100% drop-in replacement for Danfoss OMTS 315 series motors, matching mounting flanges, spline specifications, and port configurations exactly. Compatible part numbers include 151B0015 and 151B3039, and it directly replaces the OEM BMTS/OMTS 315 bearingless motors used in Fuchs 720/722M wheel excavators. Every unit undergoes 100% simulated load testing before shipment.
Technical Specifications
Model: OMTS 315 151B3039
Brand Series: Danfoss OMTS Series (OMT bearingless short version)
Geometric Displacement: 326.3 cm³/rev
Max Continuous Pressure Drop: 200 bar (2900 psi)
Max Intermittent Pressure Drop: 240 bar (3480 psi)
Max Inlet Pressure (Continuous): 210 bar (3050 psi)
Max Continuous Speed: 380 rpm
Max Intermittent Speed: 460 rpm
Max Continuous Torque: 950 N·m
Max Intermittent Torque: 1140 N·m
Max Continuous Output Power: 33.5 kW
Max Intermittent Output Power: 40.0 kW
Max Continuous Flow: 125 L/min
Max Intermittent Flow: 150 L/min
Control Type: Disc valve with independently driven hydraulically balanced valve plate, automatic wear compensation, Geroler roller-type displacement mechanism
Bearing Type: Bearingless design (direct gearbox mounting)
Mounting Flange: 4-φ14 circular flange, pilot φ125×8 mm, bolt circle φ160 mm
Shaft Type: 16-tooth splined short shaft (16-DP12/24), no output shaft
Port Size: G 3/4 BSP side port / G 1/4 BSP drain port
Rotation: Bi-directional
Recommended Viscosity: 20–75 cSt
Max Ambient Temperature: +90°C
Min Ambient Temperature: -30°C
Oil Cleanliness: ISO 22/20/16
Weight: Approx. 17.59 kg
Body Length: 166 mm
Key Technical Advantages
1. Bearingless Short-Shaft Integrated Design
The OMTS 315 151B3039 features a bearingless short-shaft structure that eliminates the front bearing and output shaft, engaging directly into the gearbox input spline bore via a 16-tooth splined short shaft for integrated motor-gearbox assembly. This design significantly shortens the transmission chain, reduces overall weight and installation space requirements, and eliminates alignment errors and additional vibration present in conventional motor-coupling-gearbox drivetrains. The OMTS combined with a gear ensures smooth and steady operation at very low speed high torque.
2. Disc Valve with Independent Drive and Automatic Wear Compensation
The OMT/OMTS Series features Danfoss’s advanced disc valve structure, with the valve plate synchronously and independently driven by a universal shaft to precisely control oil distribution to each working chamber, minimizing hydraulic and mechanical losses. The distribution face includes automatic wear compensation — the clearance does not increase with wear, maintaining high volumetric efficiency throughout the motor’s service life. Optimized flow channel design further reduces pressure drop for energy savings at 200 bar operating pressure.
3. Geroler Roller-Type Displacement Mechanism with High Starting Torque
The displacement mechanism utilizes a Geroler roller-type gear set that replaces sliding friction with rolling friction, achieving mechanical efficiency far exceeding conventional Gerotor motors. The OMTS 315 delivers up to 950 N·m continuous torque and 1140 N·m intermittent torque, with starting torque reaching more than 90% of theoretical value, easily handling heavy-load startup. The optimized gear design ensures smooth and quiet operation, suitable for frequent reversing applications.
4. High Back-Pressure Shaft Seal with Drainless Operation
The OMT/OMTS Series is equipped with a high-performance high-pressure shaft seal that withstands elevated return-line back pressure without a drain line, simplifying hydraulic system layout and reducing plumbing costs. The OMTS 315 is suitable for both open and closed loop hydraulic systems and compatible with a wide variety of hydraulic fluids.
5. 100% Simulated Load Testing
Every OMTS 315 151B3039 is validated on a 100% simulated load test bench before shipment. Testing protocols cover continuous operation at rated pressure, cyclic intermittent pressure loading, peak torque output, and internal leakage measurement, ensuring delivered performance matches published specifications.
Application Areas
Wheel Excavators: Fuchs 720/722M wheel excavator travel drive (direct replacement for OEM BMTS/OMTS 315 bearingless motor)
Forestry Equipment: Kesla forestry machinery, Ponsse harvester travel drive (compatible with Kesla 3160265, Ponsse 0067108 OEM part numbers)
Construction Machinery: Wheel excavator and wheel loader gearbox-integrated drive
Agricultural Machinery: Large tractor auxiliary drive, combine harvester gearbox drive
Material Handling: Heavy-duty winch/haulage gearbox drive
Specialty Vehicles: Compact travel-drive equipment requiring motor-gearbox integration
Expert Maintenance Tips
Pre-Installation Checklist: Verify system oil cleanliness meets ISO 22/20/16. Use a return filter rated at 10 μm or finer. Ensure the 4-φ14 circular flange pilot φ125×8 mm fits flush against the gearbox mounting surface with bolt circle φ160 mm aligned. Confirm proper fit between the 16-tooth splined short shaft and the gearbox input spline bore, ensuring full spline engagement. Tighten bolts in a diagonal sequence to the specified torque.
Bearingless Installation Notes: The OMTS Series has no front bearing. Installation must ensure the coaxiality between the gearbox input spline bore and the motor spline shaft meets requirements. Use locating pins or pilot fit to ensure precise alignment and avoid abnormal wear caused by eccentric loading.
Case Drain Configuration: The OMT/OMTS Series features a high-pressure shaft seal and typically operates without a drain line. When system back pressure exceeds the shaft seal rating, connect the G 1/4 drain port. The drain line should remain unobstructed with the outlet submerged below reservoir oil level. Install a restrictor to maintain at least 3.5 bar case pressure, preventing air ingestion.
Break-In Procedure: Before full-load operation, run new or overhauled motors at no more than 30% of continuous ratings for at least 30 minutes. This allows the Geroler displacement mechanism and disc valve to achieve optimal mating surfaces.
Fluid Management: Use 68# anti-wear hydraulic oil with working viscosity maintained at 20–75 cSt. Normal operating oil temperature should be 20–60°C, with ambient temperature not exceeding +90°C. Monitor oil cleanliness regularly; replace hydraulic fluid and clean filters immediately when contamination exceeds ISO 22/20/16.
Long-Term Storage: For storage exceeding 3 months, fill the motor interior with clean hydraulic oil and plug all ports to prevent internal corrosion. Before recommissioning, manually rotate the shaft to confirm free movement without binding.
