KYB Fan Motor Model: MSF-50-45 (Part No. B0440-50016)

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Product details

KYB MSF-50-45 Hydraulic Fan Motor (OEM Part Number: B0440-50016)

The MSF-50-45 is an original KYB orbital hydraulic piston motor specially designed for cooling fan drive systems on heavy-duty XCMG excavators. Matched perfectly with the Casappa MVPD30.45S-04S5 fan hydraulic pump, it forms a complete cooling hydraulic system for XCMG 450, 490, 500, 600, 690, 700, 750, 900 and 950 large excavators, undertaking core fan rotation and heat dissipation tasks for the whole machine.

Classified as a low-speed high-torque hydraulic piston motor, this unit receives variable oil supply from the supporting Casappa hydraulic pump and adjusts rotating speed synchronously based on hydraulic system oil temperature and engine water temperature. It automatically raises fan speed under high-temperature working conditions to enhance heat dissipation and reduces rotating speed at normal temperatures to cut energy consumption and lower system load.

Model Breakdown & Core Specifications

1. Model Coding Definition: MSF-50-45

- MSF: KYB dedicated fan motor product series

- 50: Series frame size & mounting standard

- 45: Theoretical displacement of 45 cc/rev

- B0440-50016: OEM exclusive spare part number for XCMG heavy excavator assembly

2. Key Performance Parameters

- Displacement: 45 ml/rev

- Rated working pressure: 210 bar, peak instantaneous pressure: 250 bar

- Rated speed range: 50–2200 rpm

- Output torque: Stable high torque output at low rotating speed

- Compatible medium: ISO VG46 anti-wear hydraulic oil, suitable for all conventional hydraulic system configurations

3. Structural & Performance Advantages

Adopting precision gerotor piston internal structure, the hydraulic motor features compact layout, high volumetric efficiency and outstanding wear resistance. It is equipped with built-in pressure relief protection to prevent overload damage to the hydraulic system caused by fan blade jamming. With small starting resistance and stable rotation without jitter, it resists dust, vibration and high temperatures in mine and construction sites, greatly extending the service life of the supporting hydraulic pump and overall hydraulic components.

4. Application Scope

Genuine replacement hydraulic motor for XCMG large-tonnage excavator cooling circuits. Paired with Casappa MVPD30.45S-04S5 hydraulic pump, it constitutes the standard fan drive assembly, widely applied in mining, earthmoving, quarry and heavy engineering construction scenarios.

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