HMR105 Linde Variable Piston Motor 420Bar

Product Overview

The HMR105 / HMR105-02 series high-pressure swashplate axial piston variable motors are specifically engineered for heavy-duty open and closed circuit hydraulic drives. Built to exact industrial standards, these motors offer 100% drop-in interchangeability with Linde Hydraulics HMR 105 series units in terms of mounting interfaces, shaft splines, port layouts, and displacement control characteristics. Utilizing 21° swashplate technology, the HMR105 delivers exceptionally high power density, superior low-speed torque stability, and rapid dynamic stroke control. Every unit undergoes 100% simulated full-load bench testing prior to shipment, guaranteeing OEM-level performance while significantly optimizing equipment uptime and maintenance expenditure.

Technical Specifications 

• Model Code: HMR105 / HMR105-02 (Compatible with Linde HMR 105 Series)

• Maximum Displacement: 105.0 cm³/rev

• Nominal Working Pressure: 420 bar (42 MPa)

• Peak Pressure Rating: 500 bar (50 MPa)

• Maximum Operating Speed: 4100 rpm (at minimum displacement) / 3700 rpm (at maximum displacement)

• Control Options: H1/H2 (Hydraulic Proportional Control), E1/E2 (Electric Proportional Control 24V DC), Automatic Pressure Override

• Swashplate Angle Range: 0° to 21° stepless regulation

• Direction of Rotation: Bi-directional

• Sealing & Fluid Compatibility: High-pressure FKM seals, HLP Mineral Hydraulic Oils (ISO 4406 Cleanliness ≤ 18/16/13)

• Approximate Net Weight: 65 kg

Key Technical Advantages

• 100% Drop-In OEM Interchangeability: Precision-machined to match exact original Linde specs. Mounting flanges, splined shafts, and high-pressure oil ports fit seamlessly without hydraulic line or structural alterations.

• 21° Swashplate Design for High Power Density: The 21° swashplate technology allows a compact, lightweight body while providing high starting torque and vibration-free rotation at low speeds.

• Exceptional Volumetric Efficiency & High-Pressure Durability: Features bimetallic valve plates and heat-treated piston shoes that sustain over 95% volumetric efficiency under 420 bar continuous operating pressure, minimizing heat buildup.

• 100% Full-Load Bench Testing: Each motor is rigorously validated on dynamic test benches for rated pressure, peak pressure, internal leakage, and response times, supplied with factory inspection certificates.

Application Areas

• Construction Equipment: Tracked excavator travel drives, crawler crane winches, and rotary drilling rig rotary heads.

• Agricultural & Forestry Machinery: Combine harvester traction drives, timber grapples, and forestry log loaders.

• Road Construction & Mining: Asphalt cold planers, road rollers, and underground mining shuttles.

• Marine & Offshore Winches: Deck cranes, mooring winches, and heavy-duty offshore hydraulic drives.

Expert Maintenance Tips

• Mandatory Housing Pre-Filling: Before initial startup or after long downtime, fill the motor housing completely with clean, filtered hydraulic fluid via the top drain port (L or U) to avoid dry-running damage.

• Verify Minimum Displacement Limit: Ensure the minimum displacement mechanical stop is set properly according to system speed limits to prevent catastrophic overspeeding.

• Maintain Fluid Cleanliness & Flushing: Utilize integrated flushing valves and maintain oil cleanliness at ISO 4406 18/16/13 or better to ensure long bearing and rotary group service life.