SGP1A23 SGP1A25 Hydraulic Gear Pump | Shimadzu Replacement | 21MPa High Pressure

The SGP1 Series by Chengyuan Hydraulic (including models SGP1A23F2H9 and SGP1A25F2H9) is a high-performance external gear pump engineered for heavy-duty industrial applications. Designed to be 100% interchangeable with Shimadzu standards, these pumps offer a reliable, cost-effective replacement for forklifts and material handling equipment. Featuring a three-piece high-strength aluminum construction and hardened alloy steel gears, the SGP1 series excels in durability. Every unit undergoes 100% simulated condition testing, ensuring maximum volumetric efficiency and steady performance under pressures up to 21 MPa.

Technical Specifications 

• Model Codes: SGP1A23 / SGP1A25 series

• Displacement:

  • SGP1A23: 23.0 $cm^3/rev$

  • SGP1A25: 25.0 $cm^3/rev$

• Rated Operating Pressure: 21 MPa (210 bar / 3045 psi)

• Peak Pressure: 25 MPa (250 bar / 3625 psi)

• Speed Range: 500 – 3000 rpm

• Drive Shaft: Available in Spline (13T) or Parallel Keyed options

• Mounting Flange: SAE 2-bolt or 4-bolt configurations

• Fluid Cleanliness: ISO 4406 20/18/15 recommended

• Weight: Approx. 4.2 – 4.8 kg

Key Technical Advantages

• Floating Bushing Compensation: Utilizing advanced side-plate floating compensation, the pump automatically adjusts axial clearances via hydraulic pressure. This mechanism maintains volumetric efficiency above $93\%$, minimizing internal leakage and reducing system overheating.

• Extruded High-Tensile Aluminum Body: The housing is crafted from high-density aluminum alloy extrusion. This material provides an exceptional strength-to-weight ratio and superior fatigue resistance against high-pressure surges, preventing shell deformation.

• Low-Pulse Gear Profiling: Gears are precision-ground with optimized tooth profiles to reduce oil trapping ripples. This results in ultra-smooth operation and significantly lower noise levels, ideal for electric forklifts and indoor machinery.

• Heavy-Duty DU Bearings: Equipped with industrial-grade self-lubricating DU composite bushings. These offer high radial load capacity, ensuring a stable hydrodynamic oil film for the gear journals even under peak RPM.

Application Areas

• Forklift Trucks: Primary lift and tilt hydraulic systems for major brands like Toyota, Mitsubishi, and Komatsu.

• Agricultural Equipment: Hitch control and steering circuits for tractors and harvesters.

• Material Handling: Hydraulic power units for lift tables and dock levelers.

Expert Maintenance Tips

• Direction of Rotation: Always verify the rotation (R for Clockwise, L for Counter-Clockwise) before installation. Operating the pump in the wrong direction will result in immediate shaft seal failure.

• Initial Priming: Before the first start, fill the pump housing with clean hydraulic oil through the inlet port. Rotate the shaft by hand for several turns to ensure components are lubricated and air is purged.

• Filtration Standard: To protect the precision internal side plates, maintain the system filtration at $25\mu m$ or better, and check the oil status regularly for signs of emulsification.