John Deere AT Series Piston Pump & Motor | AT302661 AT223519 AT197383 AT432422

The AT Series axial piston pumps and motors by Chengyuan Hydraulic are heavy-duty components engineered specifically for John Deere excavators, dozers, and loaders. This range, including AT302661, AT223519, AT197383 pumps and AT432422, AT455737 motors, is manufactured to match stringent OEM specifications. To withstand high-frequency shocks and continuous full-load cycles, we have reinforced the rotating groups with premium materials and advanced heat treatment. These units offer 100% original-place interchangeability and undergo 100% simulated condition testing. They deliver identical pressure response and volumetric efficiency compared to the original units, providing a high-performance, cost-effective alternative for fleet maintenance.

Technical Specifications :

• Compatible Brand: John Deere

• Pump Models: AT302661, AT223519, AT197383

• Motor Models: AT432422, AT455737

• Nominal Pressure: $34.5\text{ MPa (345 bar / 5000 psi)}$

• Peak Pressure: $40\text{ MPa (400 bar / 5800 psi)}$

• Control Types: Load Sensing (LS), Pressure Compensator

• Max Rated Speed: $2200\text{–}3200\text{ rpm}$ (depending on frame size)

• Displacement Range: $45\text{cc}$ to $130\text{cc}$ customized for JD machinery

• Housing: High-strength ductile iron for superior fatigue resistance

Key Technical Advantages:

• Reinforced Rotating Groups: The piston-slipper assembly undergoes specialized bronze-tin alloying and vacuum quenching. This significantly enhances anti-seizure properties during high-pressure transitions and prevents slipper detachment.

• Precision Valve Plate Engineering: The valve plate profiles are optimized using computational fluid dynamics (CFD) with integrated silencing grooves. This reduces flow ripple and lowers operating noise by $3\text{–}5\text{ dB(A)}$, extending the life of downstream components.

• Bimetal Side Plate Technology: Our motors feature bimetal side plates that provide excellent self-lubrication during high-speed startups and frequent reversals, ensuring smooth torque output even at ultra-low speeds.

• 100% Full-Condition Testing: Every AT series unit is tested across the entire pressure and speed spectrum before shipping, simulating the actual performance on John Deere equipment in extreme environments.

Application Areas:

• Excavators: Main hydraulic pumps or travel and swing drive motors.

• Bulldozers: Closed-loop hydrostatic drive systems.

• Graders & Loaders: Implement pumps or auxiliary hydraulic drives.

Expert Maintenance Tips:

• System Flushing: Since the AT series contains high-precision variable mechanisms, thoroughly flush the hydraulic tank and lines before installation. Use filters with a rating of $10\mu\text{m}$ or better.

• Pre-Start Priming: Never perform a dry start. After installation, fill the pump or motor housing with clean hydraulic oil through the drain port and bleed all air before low-speed loading.

• Case Drain Pressure: Monitor the case drain line to ensure pressure does not exceed $0.2\text{ MPa (2 bar)}$. Excessive backpressure can cause premature shaft seal failure or sluggish control response.