4K R4K Hydraulic Orbit Motor | R4K-195 R4K-310 R4K-625 R4K-985 | Disc Valve Motor

LIC Hydraulic’s 4K / R4K Series hydraulic orbit motors represent the pinnacle of Disc Valve technology for medium to heavy-duty applications. Engineered to replace the industry-standard Eaton Char-Lynn 4000 series, these motors utilize a Geroler gear set with precision-hardened rollers to minimize friction and maximize torque density. Covering a wide displacement range from 195cc to 985cc, the R4K series is designed to deliver consistent performance under high pressure and variable load conditions. Whether for mobile propulsion or industrial mixing, our R4K motors provide the rugged reliability and high volumetric efficiency your machinery demands.

Technical Specifications (Quick Reference)

• Displacement Range: 195cc, 245cc, 310cc, 390cc, 490cc, 625cc, 800cc, 985cc.

• Max Pressure: Up to $310\text{ bar}$ ($4500\text{ PSI}$) peak for smaller displacements.

• Max Torque: Capable of producing up to $1850\text{ Nm}$ ($16,400\text{ lb-in}$).

• Mounting: Standard 4-bolt SAE B / CC or Wheel Mount options.

• Shaft Options: Splined, Keyed, or Tapered shafts to suit your coupling requirements.

Key Technical Advantages

• Disc Valve Efficiency: The separate disc valve oscillates at shaft speed to provide precise fluid timing, ensuring high-efficiency operation and smooth low-speed rotation (as low as 10-15 rpm).

• Robust Geroler Gear Set: The inclusion of rollers in the gear set provides a rolling contact point rather than a sliding one, which reduces startup torque requirements and extends the life of the motor in harsh environments.

• High External Load Capacity: Heavy-duty tapered roller bearings are integrated to support significant radial and axial loads, allowing for direct mounting of wheels or heavy pulleys without auxiliary support.

• Superior Sealing: Advanced shaft seals allow for high backpressure capability, reducing the need for drain lines in many standard circuit configurations.

Application Areas

• Heavy Duty Winches: Providing the necessary starting torque for marine and recovery winches.

• Mobile Propulsion: Driving wheels on sweepers, compact loaders, and harvesters.

• Industrial Mixing: Constant speed and high torque for chemical or construction material agitators.

Expert Maintenance Tips

• Priming is Mandatory: Before the first startup, always fill the motor housing with clean hydraulic oil through the drain port to ensure the internal components are lubricated.

• Drain Line Utilization: For applications involving frequent dynamic braking or series circuits where backpressure is high ($>20\text{ bar}$), always use the external drain port to prevent shaft seal failure.

• Filtration Standards: To ensure the longevity of the disc valve’s precision surfaces, maintain system oil cleanliness at ISO 4406 19/17/14 or better. Particle contamination is the primary cause of efficiency loss and internal scoring.