Product Overview
The HMV75-02 is a variable displacement axial piston motor from the Linde HMV-02 series (now part of Eaton’s DuraForce product family), featuring a maximum displacement of 75.9 cm³/rev and a nominal operating pressure of 450 bar (peak 500 bar) . Utilizing a swash plate axial piston design with hydraulic two-position control (H2 type) , this motor enables rapid switching between maximum and minimum displacement settings, making it ideal for high-performance drive applications in both closed and open loop hydraulic circuits .
Our HMV75-02 is manufactured to exact Linde OEM specifications, featuring an SAE standard mounting flange, ANSI B92.1 involute spline shaft, and identical port locations for true drop-in interchangeability . Every unit undergoes 100% simulated operating condition testing, covering output torque at rated pressure, volumetric efficiency, noise level, and temperature rise performance.
Technical Specifications
Model: HMV75-02 (Part No. example: 2571 H2X233U02294)
Motor Type: Swash plate axial piston variable displacement motor
Maximum Displacement: 75.9 cm³/rev
Nominal Pressure: 450 bar (45,000 kPa / approx. 6,527 psi)
Peak Pressure (Intermittent): 500 bar (approx. 7,252 psi)
Max. Operating Speed (Vmax): 3,800 rpm
Max. Operating Speed (Vmin): 4,400 rpm
Output Torque (at Δp=430 bar): 519 N·m
Control Method: Hydraulic two-position control (H2 type), capable of shifting to 0 cm³/rev
Mounting Flange: SAE standard flange
Shaft Profile: ANSI B92.1 involute spline, 16/32 pitch
Port Configuration: Side ports (standard)
Hydraulic Fluid: Petroleum-based hydraulic oil (ISO VG32–68)
Operating Oil Temperature: 30–90°C
Weight: Approx. 32 kg (without oil)
Key Technical Advantages
1. High Power Density in a Compact Package
The HMV-02 series delivers 75.9 cm³/rev displacement and 450 bar nominal pressure within an exceptionally compact envelope, achieving power density significantly higher than comparable motors . The compact design allows direct integration into axle or gearbox housings, reducing intermediate driveline components and simplifying machine layout.
2. Wide Torque/Speed Conversion Range
With continuous displacement adjustment from Vmax to Vmin (or two-position switching between maximum and zero displacement), the motor provides a broad torque output range, meeting the diverse demands of both travel drive and implement drive functions in construction machinery .
3. High Starting Torque and Smooth Low-Speed Operation
The swash plate axial piston design with hydrostatically balanced slippers enables high starting torque even at low speeds, with smooth operation free from stick-slip effects — ideal for applications requiring precise speed control such as drilling rig rotation and paver travel drives.
4. Fast Dynamic Response and Long Service Life
The displacement mechanism uses hydraulic pilot control for rapid response. The rotating group features precision-lapped piston/cylinder assemblies and high-strength bearing supports, providing excellent contamination tolerance, extended service life, and maintenance intervals of 4,000+ hours.
5. Complete Drop-In Interchangeability
Mounting flange dimensions, shaft specifications, port locations, and control interfaces are identical to genuine Linde HMV75-02 motors. No piping or mounting bracket modifications are required for replacement, minimizing equipment downtime.
Application Areas
Excavator Travel Drive: Tracked excavator travel motors with high/low speed switching via variable displacement
Paver Travel Systems: Asphalt paver travel drives requiring smooth low-speed and high-torque output
Rotary Drilling Rigs: Mast rotation and power head drives requiring precise speed control
Roller Travel Drive: Vibratory roller travel motors with stepless speed control via variable displacement
Crane Hoist Drives: Mobile and crawler crane hoist mechanisms
Marine Deck Machinery: Anchor winch and towing winch hydraulic drive systems
Expert Maintenance Tips
1. Pre-Installation Inspection
Before installation, verify that system piping has been thoroughly flushed and fluid cleanliness meets NAS Class 9 or better. Check the flatness of the SAE flange mounting surface and tighten bolts in a diagonal sequence to specified torque to prevent flange distortion and leakage.
2. Case Priming and Air Bleeding
Before initial startup, the motor case must be filled with hydraulic fluid through the case drain port. After startup, run at low pressure (not exceeding 50 bar) for 5–10 minutes to bleed air from the system. Confirm no abnormal noise before gradually increasing to rated pressure.
3. Control Pressure Settings
The HMV-02 H2 hydraulic control motor requires pilot control pressure in the range of 20–40 bar, with control start pressure of 7/8/9/9.5 bar depending on configuration . Use a precision pressure gauge when adjusting control pressure and never exceed the maximum permissible value of 40 bar.
4. Periodic Inspection and Service Schedule
Inspect case drain leakage every 2,000 operating hours. If leakage exceeds 5% of rated flow, disassemble and inspect piston/cylinder assemblies and the valve plate. Replace hydraulic fluid every 2,000 hours or annually, and inspect or replace filter elements every 500 hours. After extended shutdown (over 3 months), manually rotate the shaft several turns before restarting.
