KYB MSF Series Piston Motor | MSF12 MSF18 MSF23 MSF30 MSF50 | KYB Hydraulic

LIC Hydraulic offers the KYB MSF Series, a premier line of high-pressure axial piston motors designed specifically for track-driven machinery. Ranging from MSF12 to MSF50, these motors are often supplied as integrated Final Drive units, combining a high-speed piston motor with a multi-stage planetary gearbox. The MSF series is the industry standard for excavators from $1.5$ to over $10$ tons, featuring built-in parking brakes, counterbalance valves, and automatic two-speed shifting. Engineered with KYB’s legendary precision, the MSF series delivers smooth, powerful traction and unmatched reliability in the most challenging terrains.

Technical Specifications (Bulleted List)

• Series: KYB MSF Series (Swash Plate Axial Piston Type)

• Models: MSF12, MSF18, MSF23, MSF30, MSF50

• Max Pressure: Up to $34.3\text{ MPa}$ ($5000\text{ PSI}$)

• Functions: Integrated Two-Speed Displacement, Counterbalance Valve, and Mechanical Brake.

• Application: Primary Travel Drive for Crawler Excavators and Drilling Rigs.

Key Technical Advantages

• Compact Integration: By consolidating the motor, brake, and control valves into a single housing, the MSF series saves significant space and simplifies the hydraulic circuit on mobile equipment.

• High Start-up Torque: The Gerotor-style pilot control and optimized piston geometry ensure maximum torque availability from a standstill, critical for heavy-load climbing.

• Smooth Shifting: The internal two-speed logic allows the motor to transition seamlessly between high-speed travel and high-torque work modes based on system pressure sensing.

• Long Service Life: Key wear components are treated with advanced surface hardening technologies to withstand high-pressure pulses and fluid contamination common in construction environments.

Application Areas

• Crawler Excavators: Travel motors for mini, midi, and medium excavators.

• Drilling Rigs: Mobility units for track-mounted rotary and anchor drills.

• Harvesters: Propulsion systems for tracked agricultural machinery operating in soft soil.

Expert Maintenance Tips

• Gear Oil Maintenance: The planetary gearbox section requires dedicated lubrication. Change the gear oil after the first $500$ hours of operation to remove bedding-in particulates.

• Case Drain Management: Ensure the case drain line has zero obstructions. High backpressure in the case can blow the shaft seal and cause the parking brake to drag.

• Hydraulic Fluid Cleanliness: To maintain the precision of the two-speed switching valve, keep hydraulic oil at an $ISO\text{ 19/17/14}$ cleanliness level or better.