HMK Series Low Speed High Torque Disc Valve Orbital Hydraulic Motor
The HMK series is a disc-valve distribution orbital hydraulic motor, fully interchangeable with Eaton 4K series. Adopting high-precision gerotor set & automatic wear compensation valve plate structure, it covers multiple displacements from 160 to 490 ml/r. Featuring compact overall dimension, stable low-speed operation, huge breakout torque, high pressure resistance & wear resistance, excellent mechanical and volumetric efficiency. It supports bi-directional rotation, customized flanges and spline shafts. Widely applied for low-speed heavy-load drive of mining machinery, construction equipment, agricultural machinery, sanitation vehicles and other industries, serving as an ideal replacement for imported hydraulic orbital motors.
| (ml/r)Displacement | 160 | 195 | 245 | 315 | 395 | 490 | |
| ( L PM ) Flow | Continuous | 95 | 95 | 95 | 95 | 95 | 95 |
| Intermittent | 115 | 115 | 130 | 130 | 150 | 150 | |
| (RPM) speed | Continuous | 560 | 440 | 354 | 290 | 225 | 180 |
| Intermittent | 670 | 535 | 480 | 395 | 350 | 285 | |
| ( Mpa) pressure | Continuous | 20.5 | 20.5 | 20.5 | 20.5 | 19 | 14 |
| Intermittent | 31 | 31 | 26 | 26 | 24 | 17 | |
| (N*m) Torque | Continuous | 450 | 565 | 700 | 856 | 1020 | 950 |
| Intermittent | 680 | 855 | 890 | 1085 | 1285 | 1154 | |
Core Advantages
- Compact Structure & Wide Mount Compatibility
Integrated die-cast housing with tiny overall size and narrow radial width, perfectly fitting limited installation space. Equipped with standard SAE square flange, optional straight key & multiple spline shafts. Direct replacement for imported motors without frame modification, greatly shortening R&D & refitting cycle.
Stable Low-Speed & Superior Breakout Torque
Precision gerotor pair & floating valve plate for automatic wear compensation, smooth operation down to 5rpm without crawling. High torque density design delivers 50% higher starting torque, sufficient power for heavy-load start-up, no jitter during lifting, slewing and drilling operations.
High Pressure Resistance & Long Service Life
Thickened wear-resistant stator & rotor, heavy-duty double taper roller bearings to bear massive radial & axial impact force. Continuous working pressure up to 21MPa, intermittent peak pressure 25MPa. Imported composite sealing prevents dust, water and oil leakage, low failure rate and extended maintenance interval.
High Efficiency & Energy Saving
Optimized flow channel design achieves top volumetric & mechanical efficiency with minimal internal leakage under high pressure and less heat generation. Cut energy loss of host hydraulic system, reduce fuel & power consumption and extend continuous operation time.
Full Displacement Range & Customizable
Standard displacements: 160/195/245/315/395/490 ml/r. Optional bi-directional rotation, built-in relief valve, brake and two-speed function. Customizable mounting flange, output shaft and port layout for non-standard machinery, OEM mass production available.
Applications
- HMK series motors are widely used in low-speed heavy-load drive equipment including construction machinery, mining equipment, agricultural machinery, sanitation vehicles, woodworking machinery, marine winches and injection molding machines.
1.OEM/ODM capabilities
2.Competitive pricing & bulk discounts
3.Fast shipping & customs clearance support
4.Turnkey project solutions
Standard Warranty: 12 months
Extended Warranty: Optional coverage up to 24 months.
Global Support: 24/7 technical assistance and spare parts supply.
Training: On-site or remote operation/maintenance training.
A: Standard models ship in 7-15 days; customized units require 30-45 days.
A: Yes, we have partnered service centers in key regions.
A: Absolutely! We offer tailored attachments.
A: Full export package (Commercial Invoice, Packing List, Bill of Lading, COC, etc.).
A: Contact us via email/phone for a quote, then confirm with a PO.
