401-00354A Hydraulic Main Gear Pump for Doosan Wheel Loader | 401-00081A 401-00080 401-00156 Replacement

The 401-00354A series hydraulic gear pump from Chengyuan Hydraulic is a high-performance main pump engineered specifically for Doosan Wheel Loaders (e.g., DL Series). Fully compatible with OEM part numbers 401-00081A, 401-00080, and 401-00156, our pumps offer 100% original-place interchangeability. To withstand the frequent shock loads during digging and lifting, we have optimized the fatigue strength of the pump body. Every unit is subjected to 100% simulated condition testing to guarantee peak volumetric efficiency under full load.

Technical Specifications :

• OEM Part Numbers: 401-00354A / 401-00081A / 401-00080 / 401-00156

• Compatible Machinery: Doosan Wheel Loaders

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

• Peak Pressure: 30 MPa (300 bar / 4350 psi)

• Rated Speed: 2500 rpm

• Max Speed: 3000 rpm

• Drive Shaft: 15T Spline Shaft (or customized to OEM standard)

• Construction Material: High-strength anti-extrusion aluminum alloy / Hardened alloy steel gears

• Sealing: Premium NBR / FKM (Viton) for high-temperature resistance

Key Technical Advantages:

• Three-Piece High-Pressure Design: The pump body utilizes a specialized high-density aluminum extrusion process with floating bushings for automatic axial clearance compensation. This maintains volumetric efficiency above $95\%$ even under continuous 25MPa pressure, reducing fuel consumption and heat.

• Precision-Ground Alloy Gears: Gears are crafted from high-tensile alloy steel with carburized quenching and ultra-fine profile grinding. This ensures high contact consistency, significantly minimizing pressure ripples and noise during heavy-duty lifting operations.

• Heavy-Duty Bearing System: Designed for dusty and high-load environments, the pump features self-lubricating DU composite bushings. These bearings offer exceptional radial load capacity, preventing shaft eccentric wear and extending the Mean Time Between Failures (MTBF).

• 100% Factory Tested Performance: Every pump undergoes comprehensive load-cycle testing on our benches to verify displacement stability across various temperatures and pressures, ensuring OEM-level performance right out of the box.

Application Areas:

• Loader Lifting Circuits: Providing rapid lifting power for the boom cylinders.

• Steering Systems: Ensuring responsive and precise steering even under full load.

• Attachment Drive: Powering optional tools like log grapples or side shifters.

Expert Maintenance Tips:

• Oil Cleanliness: Main pumps are highly sensitive to contamination. Maintain system filtration at $10\text{–}20\mu m$ and replace return filters periodically.

• Alignment Check: Ensure perfect alignment between the spline shaft and the engine PTO. Avoid hammering during installation; radial stress from misalignment is the leading cause of early shaft seal failure.

• Inlet Sealing: Regularly check the tightness of the suction hose clamps. Prevent air ingestion, which causes cavitation—a phenomenon that rapidly erodes gear faces and bushings.