Casappa GP1 Series Gear Pump | GP1D3 GP1D5 GP1D7 | 1AD9ACP129 1MC2F996 Replacement

The GP1 Series high-pressure external gear pumps by Chengyuan Hydraulic are precision power units fully compatible with Casappa industrial standards. Spanning displacements from GP1D3 to GP1D7, this series offers various flange and shaft configurations (as seen in codes 1AD9ACP129 and 1MC2F996). Constructed with a high-strength two-piece aluminum body, the GP1 series is engineered for space-constrained applications requiring high-pressure reliability. Every unit is subjected to 100% simulated condition testing, strictly verifying volumetric efficiency and thermal stability under rated loads to ensure 100% original-place interchangeability with OEM components.

Technical Specifications :

• Core Models: GP1D3, GP1D5, GP1D7 (Codes: 1AD9ACP129 / 1MC2F996)

• Displacement: $1.39\text{ cm}^3/\text{rev}$ to $11.8\text{ cm}^3/\text{rev}$ (Based on model size)

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

• Peak Pressure: $27\text{ MPa (270 bar / 3915 psi)}$

• Max Speed: Up to $4000\text{ rpm}$

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

• Shaft Ends: 1:8 Tapered, Parallel Keyed, or Splined

• Mounting Flange: European standard 2-bolt or SAE standard

• Sealing: High-grade NBR (standard) or Viton (FKM) for high-temperature resistance

Key Technical Advantages:

• Automatic Axial Clearance Compensation: Utilizing advanced lateral thrust plate technology, the pump automatically adjusts end-face clearances as pressure rises. This maintains over 90% volumetric efficiency even at 250 bar, minimizing energy loss.

• High-Tensile Fatigue-Resistant Body: The housing is extruded from aerospace-grade aluminum alloy and heat-treated. This prevents structural deformation or fatigue cracking under frequent pressure cycles and high-vibration environments.

• DU Bearing Support System: Equipped with high-performance DU bearings that provide superior lubrication under heavy loads. The precision-ground gear journals ensure a low friction coefficient, extending mechanical life and reducing operational noise.

• Modular Configuration Flexibility: Codes like 1MC2F996 demonstrate high versatility. By changing front and rear covers, the pump easily adapts to various port positions and flange standards, simplifying the replacement process for legacy equipment.

Application Areas:

• Mobile Machinery: Forklift steering, mini-loader auxiliary circuits, and sanitation truck hoists.

• Industrial Power Units: Clamping devices for small machine tools and primary supply for hydraulic balers.

• Agricultural Equipment: Tractor 3-point hitch controls and harvester header drives.

Expert Maintenance Tips:

• Alignment Precision: For parallel keyed shafts (1AD9 types), never use excessive force to mount couplings. Axial impacts can damage the internal thrust plates, leading to increased internal leakage.

• Inlet Velocity Control: Ensure the suction line is sufficiently sized. Maintain fluid velocity between $0.5\text{–}1.5\text{ m/s}$ to avoid cavitation, which causes “honeycomb” pitting on the gear surfaces.

• Viscosity Management: For optimal performance, use high-quality anti-wear hydraulic oil with a viscosity between $12\text{–}100\text{ mm}^2/\text{s}$. Recommended operating temperatures are $30\text{°C}$ to $60\text{°C}$.