SDY1 Series Hydraulic Gear Pump | SDY1-27.5 SDY1-20 SDY1-209.5 | High Pressure Pump

The SDY1 Series high-pressure gear pumps by Chengyuan Hydraulic are high-precision power units engineered for heavy-duty industrial and mobile applications. Covering displacements like SDY1-27.5, SDY1-209.5, and SDY1-275, this series is designed to match international interchangeability standards perfectly. The SDY1 series features a high-strength aluminum alloy body combined with a floating bushing structure. Utilizing advanced pressure compensation technology, it ensures exceptional volumetric efficiency even at continuous pressures of 25 MPa. As a premium replacement solution, all units undergo 100% simulated condition testing, guaranteeing superior standards in pressure ripple control, noise reduction, and service life.

Technical Specifications:

• Core Models: SDY1-27.5, SDY1-20, SDY1-275, SDY1-209.5

• Displacement Range: $10.0\text{ to } 32.0\text{ cm}^3\text{/rev}$ (based on specific suffix)

• Rated Pressure: $20\text{ MPa (200 bar / 2900 psi)}$

• Peak Pressure: $25\text{ MPa (250 bar / 3625 psi)}$

• Speed Range: $500\text{–}3000\text{ rpm}$

• Rotation: L (Counter-Clockwise) or R (Clockwise)

• Mounting: F2/L (Rectangular or SAE standard flanges)

• Shaft Specification: H2 (Specific Tang, Keyed, or Splined ends)

• Volumetric Efficiency: $\ge 93\%$

Key Technical Advantages:

• Dual Floating Pressure Compensation: Features advanced floating side plates/bushings that automatically adjust axial clearances using system pressure. This mechanism drastically reduces internal leakage and maintains constant high efficiency across the full pressure range.

• High-Strength Three-Piece Construction: The pump body is extruded from high-tenacity aluminum alloy, while the covers are made of anti-fatigue cast iron. This material blend ensures a lightweight design with extreme resistance to impact and high-pressure deformation.

• Precision Gear Grinding & Matching: Gears are manufactured using high-precision grinding processes with micro-profile modification, ensuring exceptionally smooth engagement. This minimizes mechanical noise and significantly reduces pressure ripple within the hydraulic system.

• Specialized DU Composite Bearings: Equipped with high-performance sliding bearings that offer excellent self-lubrication and resistance to offset loads. These bearings prevent shaft seizing even in dusty environments or with minor fluid contamination, extending the overhaul cycle.

Application Areas:

• Logistics Handling: Primary hydraulic source for forklift lift systems and electric pallet stackers.

• Sanitation Machinery: Lifting mechanisms for dump trucks and compression systems for garbage trucks.

• Agricultural Equipment: Auxiliary hydraulic circuits for compact tractors and harvester drives.

Expert Maintenance Tips:

• Shaft Alignment: Ensure the coaxiality error between the drive shaft and pump shaft is less than $0.1\text{mm}$. Never strike the pump shaft with a hammer during installation, as this can damage the internal floating bushings.

• Oil Temperature Monitoring: Maintain system oil temperature between $30\text{–}60\text{°C}$. Temperatures exceeding $80\text{°C}$ will lead to increased leakage and premature seal failure due to decreased viscosity.

• Priming & Venting: Fill the pump cavity with oil via the outlet before the first start. Run the pump under no load for $5\text{–}10$ minutes to bleed all air from the system and prevent cavitation.