Product Overview
The KYB MSF-23 (B0440-28010) is a high-torque hydraulic swing motor engineered for controlled rotary positioning in mobile and industrial hydraulic systems. Manufactured by KYB, a globally recognized OEM supplier of hydraulic components, this unit converts hydraulic pressure and flow into precise bidirectional rotational output, making it the ideal drive solution for excavator swing circuits and similar slewing applications. The MSF-23 integrates a compact, robust housing with an internal brake and relief valve architecture, delivering smooth acceleration, controlled deceleration, and reliable load holding without drift. Its design prioritizes energy-efficient operation, low internal leakage, and long service life under continuous duty cycles.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Hydraulic Swing Motor |
| Model Designation | MSF-23 / B0440-28010 |
| Manufacturer | KYB |
| Operating Pressure | Standard Industrial Grade (Up to rated bar) |
| Mounting & Connection | Standard ISO / Manufacturer Interface |
| Displacement Type | Fixed Displacement, Rotary Output |
| Brake Configuration | Integrated Mechanical / Hydraulic Holding Brake |
| Relief Protection | Built-in Crossover Relief Valves |
Engineering Features & Advantages
- Precision Performance: Optimized internal geometry delivers smooth, controllable swing motion with minimal pressure ripple and stable low-speed operation, enabling accurate positioning of heavy loads.
- Integrated Braking & Relief: The factory-fitted holding brake and crossover relief valves prevent load drift and protect the motor from pressure spikes during rapid deceleration or external shock loads.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with hardened internal components and high-quality sealing that resist contamination and extend service intervals.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original OEM standards, ensuring drop-in installation without modification to mounting flanges, ports, or drive shafts.
- Compact High-Torque Design: High power-to-weight ratio allows efficient slewing control in space-constrained machine envelopes without sacrificing torque output.
Typical Industrial Applications
The KYB MSF-23 swing motor is widely deployed in heavy-duty slewing and rotary positioning systems, including hydraulic excavators and mini-excavators, material handling and forestry cranes, truck-mounted and marine deck cranes, as well as turntable and index drives on specialized industrial machinery. Its robust construction and precise control characteristics make it equally suitable for construction, mining, port logistics, and stationary automation equipment requiring dependable rotational motion under continuous load.
PRODUCT IMAGES
KYB MSF-23 / B0440-28010 Hydraulic Swing Motor
⚡ Emergency Plant Maintenance & Ready-to-Ship Notice:
- Authentic & Fully Tested: 100% bench tested for hydraulic response, pressure rating, and null-bias stability before dispatch.
- Fast Dispatch: In-stock units ready for same-day dispatch via DHL / FedEx Express directly to your plant.
- Pre-Shipment Verification: High-definition photos, video testing runs, and serial number verification provided prior to shipment.
- Peace of Mind: Covered by our 12-Month Replacement Warranty.
Shop the genuine KYB MSF-23 / B0440-28010 Solenoid Directional Control Valve. This Japan-made hydraulic component features a spool-type design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.