Product Classification: TMT Orbital Motor
The Danfoss TMT Series is officially categorized as a large low-speed, high-torque orbital motor. Although some buyers may search for terms such as "Danfoss radial piston motor" or "high-torque radial hydraulic motor," the TMT design uses an orbital gearwheel system, Geroler technology and a disc-valve arrangement rather than a conventional radial-piston construction.
The series is designed for heavy-duty propulsion and work functions where high starting torque, stable low-speed performance and strong mechanical durability are required. :contentReference[oaicite:1]{index=1}
Built for Large Hydraulic Loads
The Danfoss TMT hydraulic motor is developed for applications that require substantial torque at low or moderate shaft speeds. Its large displacement range allows the motor to generate strong output torque without relying exclusively on high rotational speed.
The TMT series combines a robust cardan shaft design, high bearing capacity, efficient orbital gearwheel technology and a durable valve system. These characteristics make it suitable for heavy mobile machinery operating under high loads, frequent reversals and challenging environmental conditions.
The TMT series is intended for hydraulic drive systems where strong starting performance, controlled low-speed movement and long service life are important.
How Does the TMT Hydraulic Motor Work?
Hydraulic Flow Enters
Pressurized hydraulic oil enters the motor through the selected inlet port.
Gearwheel Set Rotates
Hydraulic energy drives the orbital gearwheel set and creates rotary movement.
Torque Is Transmitted
The cardan shaft transfers torque to the output shaft and connected machine mechanism.
Oil Returns
The hydraulic fluid exits through the return port and continues through the circuit.
The TMT motor can provide smooth operation at low speed and high starting torque when the motor displacement, hydraulic flow, pressure and load are correctly matched. :contentReference[oaicite:2]{index=2}
Danfoss TMT Series Specifications
| Parameter | TMT Series Information |
|---|---|
| Product Category | Large low-speed, high-torque orbital hydraulic motor |
| Displacement Range | Approximately 250–630 cm³/rev |
| Intermittent Pressure Capability | Up to 350 bar, depending on model and operating conditions |
| Gearwheel Technology | Geroler orbital gearwheel set |
| Valve System | Disc valve with valve drive |
| Mounting Options | Configuration-dependent flange and mounting arrangements |
| Shaft Options | Configuration-dependent tapered, splined and other shaft options |
| Optional Functions | Speed sensor, integrated brake, flushing valve and other configuration options |
Important: Exact torque, speed, flow, pressure, bearing load, shaft and mounting data must be checked against the complete Danfoss TMT model code and the relevant technical documentation.
Core Advantages of the Danfoss TMT Motor
High Starting Torque
The large displacement design helps provide strong starting torque for heavy loads and demanding propulsion tasks.
Smooth Low-Speed Operation
The orbital motor architecture supports controlled movement and smooth operation at low rotational speed.
Robust Mechanical Construction
Strong bearings, a robust cardan shaft and durable internal components support demanding working conditions.
Flexible Configuration
Different shafts, mounting arrangements, sensors, brakes and flushing options help adapt the motor to specific equipment designs.
Where Is the TMT Series Used?
Construction Machinery
Skid steer loaders, trench compactors, compact construction machines and auxiliary drive systems.
Forestry Equipment
Forestry harvester heads and other forestry machinery requiring high torque and reliable low-speed drive.
Agricultural Machinery
Beet harvesters and other agricultural equipment requiring powerful hydraulic work functions.
Material Handling
Heavy-duty handling equipment and traction systems with high load requirements.
Road and Ground Equipment
Compacting, traction and auxiliary hydraulic drive systems operating in demanding conditions.
Customized Hydraulic Drives
Special-purpose machines requiring compact high-torque hydraulic motors and flexible installation options.
Case Example: TMT Motor for a Trench Compactor
Operating Requirement
A trench compactor works at low travel speed and must generate sufficient torque to move across uneven ground and compact soil. The hydraulic motor may experience frequent starts, stops, direction changes and temporary load peaks.
Why a TMT Motor Can Be Considered
A large-displacement TMT motor can provide high starting torque and stable low-speed drive performance. Its robust construction and high bearing capacity are valuable when the motor is exposed to heavy mechanical loads.
Engineering Checkpoints
The designer must calculate required torque, motor speed, hydraulic flow, pressure drop, bearing load, wheel or drum diameter and duty cycle before final selection.
Expected System Benefit
When correctly matched, the motor can help deliver reliable traction, controlled low-speed movement and improved operating stability under heavy working conditions.
How to Select the Correct TMT Motor
1. Required Output Torque
Calculate the continuous and peak torque required by the machine, including starting resistance and load fluctuations.
2. Working Speed
Confirm the required motor speed and make sure the hydraulic flow is compatible with the selected displacement.
3. Hydraulic Pressure
Check continuous, intermittent and peak pressure requirements according to the actual duty cycle.
4. Bearing and Radial Load
Review external shaft loads, chain or belt forces, drum loads and bearing-life requirements.
5. Installation Configuration
Confirm flange type, shaft design, port thread, drain connection, mounting dimensions and available installation space.
6. Additional Functions
Determine whether a speed sensor, integrated brake, flushing valve, special dust seal or other options are required.
Danfoss TMT Hydraulic Motor FAQ
1. What is the Danfoss TMT Series?
The Danfoss TMT Series is a large low-speed, high-torque orbital hydraulic motor designed for demanding mobile equipment and heavy-duty work functions.
2. Is the TMT a radial piston motor?
Officially, the TMT is classified as an orbital motor using a Geroler gearwheel system and disc-valve technology. It should not be technically described as a conventional radial-piston motor.
3. What is the displacement range of the TMT Series?
The TMT range generally covers approximately 250 to 630 cm³/rev. Exact displacement depends on the selected model and configuration.
4. What are the main advantages of a TMT hydraulic motor?
Key advantages include high starting torque, smooth low-speed operation, robust mechanical construction, high bearing capacity and flexible configuration options.
5. What equipment commonly uses the TMT motor?
Typical applications include skid steer loaders, trench compactors, forestry harvester heads, beet harvesters and other heavy-duty mobile machines.
6. Can the TMT motor operate at low speed?
Yes. The TMT is designed for low-speed, high-torque operation. Actual minimum and maximum operating speed must be confirmed according to the exact model, flow rate, pressure and load.
7. What information is needed to select a TMT motor?
Buyers should provide required torque, working speed, hydraulic flow, continuous and intermittent pressure, shaft load, mounting dimensions, port type and machine application.
8. Can you supply a replacement Danfoss TMT motor?
Replacement availability depends on the exact model and configuration. A complete model code, nameplate photograph or detailed motor specifications should be provided for accurate identification and quotation.
A High-Torque Motor for Demanding Hydraulic Applications
The Danfoss TMT Series hydraulic motor is a practical choice for heavy-duty mobile equipment that requires high starting torque, reliable low-speed operation and strong mechanical durability. Its large displacement range and configuration flexibility allow engineers to develop hydraulic drive systems for traction, propulsion and specialized work functions.
For overseas distributors, machinery manufacturers and hydraulic repair companies, the most important step is to verify the complete TMT model code. Displacement alone is not sufficient because shaft design, flange, ports, bearings, sensors, brakes and other options may vary between configurations.
Looking for the Correct Danfoss TMT Motor?
Send your TMT model number, nameplate photo, required displacement or machine application. Our hydraulic team can help check the motor configuration and prepare a B2B quotation.
