AT223519 AT203579 Hydraulic Pump for John Deere 624H 544H Wheel Loaders

Genlu Hydraulic proudly introduces our industrial-grade hydraulic piston pumps, specifically engineered to replace John Deere OEM part numbers AT223519 and AT203579. These high-performance units are designed to withstand the rigorous duty cycles of wheel loaders, including the 544H, 544H LL, 624H, 624H LL, and TC624H series.

Engineered for precision and built for power, our hydraulic pumps deliver superior load-sensing response and pressure stability. Genlu guarantees 100% Drop-in Interchangeability across mounting dimensions, splined-shaft specs, and hydraulic output characteristics compared to original John Deere assemblies. Every pump undergoes 100% full-pressure load testing on our digital test benches, certifying that your heavy equipment receives the rugged, reliable hydraulic power required for demanding construction and material handling operations.

Technical Specifications 

• Product Series: John Deere Wheel Loader Hydraulic Piston Pump

• Replacement Part Numbers: AT223519, AT203579

• Compatible Models: 544H, 544H LL, 624H, 624H LL, TC624H

• Nominal Operating Pressure: 280 bar

• Peak Transient Pressure: 310 bar

• Max Rated Speed: 2400 rpm

• Control Logic: Load-Sensing / Pressure Compensated

• Shaft Style: Involute Splined Shaft

• Mounting Style: Flange Mounting

Key Technical Advantages:

• Precision Load-Sensing Control: Advanced internal controls regulate flow based on real-time operational load, optimizing engine-to-hydraulic efficiency and significantly reducing fuel consumption.

• Hardened Rotating Group: Pistons and valve plates are manufactured from high-strength wear-resistant alloys with deep-nitriding treatments, ensuring elite durability in harsh, high-vibration construction sites.

• Structural Housing Rigidity: The high-strength cast-iron housing is engineered to dampen hydraulic pressure pulses and vibrations, effectively preventing premature seal failures and casing fatigue.

• Elite Seal Integrity: Equipped with premium-grade FKM (Fluoroelastomer) seals for superior heat and chemical resistance, guaranteeing leak-free operation during continuous, heavy-duty duty cycles.

Application Areas:

• Earthmoving: Primary power for bucket lifting, tilting, and auxiliary drive systems on 544H/624H loaders.

• Material Handling: Heavy-duty loading and unloading operations in ports, quarries, and logging sites.

• Civil Infrastructure: Consistent power transmission for loaders operating in demanding municipal and construction environments.

Expert Maintenance Tips:

• Fluid Cleanliness Standards: Maintain strict adherence to ISO 4406 18/16/13 fluid cleanliness. Change hydraulic filter elements every 500 hours to prevent particulate contamination from damaging the precision rotating group.

• Pre-Lubrication Procedure: Before initial operation after installation, fill the pump housing completely with clean hydraulic oil through the case-drain port. This prevents dry-start damage to the rotating group.

• Cavitation Prevention: Regularly inspect intake hoses for airtight integrity. If operational noise levels rise significantly or hydraulic response slows, verify that suction-side filters are not clogged or restricted.