AT457670 AT302661 Sauer Danfoss Piston Pump 75cc 420bar

Product Overview

The AT457670, AT302661 (cross-reference 83006780, AT455737), and 83005896 belong to the Sauer Danfoss (now Danfoss Power Solutions) axial piston pump product lines, corresponding to the 90R075 platform closed-circuit variable pump and the Series 45 open-circuit variable pump respectively. These models are widely used in hydraulic drive systems of John Deere motor graders, combine harvesters, tractors, and other mobile machinery.

AT302661 / 83006780 is a closed-circuit variable axial piston main pump built on the Sauer Danfoss 90R075 platform, featuring 75 cm³/rev displacement, 350 bar rated pressure, 420 bar peak pressure, and an integrated 14 cc charge pump with hydraulic compensation control. The pump utilizes an SAE-C 4-bolt mounting flange and 15-tooth spline shaft, manufactured strictly to John Deere OEM specifications as a direct replacement for John Deere D/G series motor graders (670D, 670G, 672G, 770D, 770G, 772G, 870D, 870G, 872G) main hydraulic drive pumps. The AT302661 forms a complete cross-reference system with AT457670, AT455737, and 83006780.

AT457670 is also a Sauer Danfoss axial piston pump with a cross-reference relationship to AT302661, fitting John Deere 772G and other motor grader models. The pump features a high-strength cast iron housing, sealed shaft bearings, and hydrodynamic cylinder barrel bearings, supporting long-term continuous operation under high pressure.

83005896 is a Danfoss Series 45 open-circuit variable axial piston pump with model code LR-L-030D-LS-16-15-NN-N-3-C2TR-A6N-PLB-NNN-NNN, 30 cm³/rev displacement, 260 bar maximum working pressure, up to 5,000 rpm maximum speed, and approximately 22.6 kg weight. The pump features a swashplate variable design with output flow proportional to drive speed and displacement, achieving stepless displacement adjustment through swashplate angle variation. It is widely used in combine harvesters (Claas Torum, Acros series, etc.) and tractor hydraulic systems.

All products are manufactured to exact Sauer Danfoss / Danfoss OEM specifications, with mounting dimensions, flange interfaces, and port layouts fully consistent with original pumps for true drop-in interchangeability. Every unit undergoes 100% simulated operating condition testing before shipment.

Technical Specifications 

AT302661 / 83006780:

• Model: AT302661 (Cross-Reference: 83006780, AT455737, 90R075)

• Platform: Sauer Danfoss 90R075 Closed-Circuit Variable Pump

• Pump Type: Axial piston variable pump, swashplate design, closed circuit

• Displacement: 75 cm³/rev

• Rated Working Pressure: 350 bar (5,075 psi)

• Peak Pressure: 420 bar (6,090 psi)

• Charge Pump Displacement: 14 cc/rev (integrated)

• Control Type: Hydraulic compensation control

• Mounting Flange: SAE-C 4-bolt flange

• Shaft Option: 15-tooth spline shaft

• Port Connection: SAE standard flange ports

• Recommended Hydraulic Fluid: ISO VG46 / VG68 anti-wear hydraulic oil

• Net Weight: Approx. 35–42 kg (varies by configuration)

• Compatible Models: John Deere 670D/670G/672G/770D/770G/772G/870D/870G/872G motor graders

AT457670:

• Model: AT457670 (Cross-Reference: 83041431)

• Pump Type: Axial piston variable pump

• Displacement: 90 cm³/rev

• Rated Pressure: 350 bar

• Peak Pressure: 420 bar

• Weight: Approx. 45–66 kg (varies by configuration)

• Compatible Models: John Deere 772G, 872G motor graders

• Manufacturer: Sauer Danfoss / OEM

83005896:

• Model: 83005896

• Full Model Code: LR-L-030D-LS-16-15-NN-N-3-C2TR-A6N-PLB-NNN-NNN

• Series: Danfoss Series 45 (Open Circuit)

• Pump Type: Swashplate axial piston variable pump, open circuit

• Displacement: 30 cm³/rev

• Maximum Working Pressure: 260 bar (3,771 psi)

• Maximum Speed: 5,000 rpm

• Rotation Direction: Left-hand (CCW)

• Weight: Approx. 22.6 kg

• Flow Range: 10–140 L/min

• Compatible Models: Claas Torum 780/750, Acros 595/585/550 Plus, Vector 420/410, Sampo combine harvesters and tractors

Key Technical Advantages

1. 90R075 Platform Closed-Circuit High-Performance Design (AT302661 / 83006780): The AT302661 is built on the proven Sauer Danfoss 90R075 closed-circuit platform, employing a parallel axial piston/slipper design with a tiltable cradle swashplate. The 75 cm³/rev displacement delivers a stable high-pressure oil source at 350 bar rated pressure. The integrated 14 cc charge pump supplies replenishing and control oil flow to the closed loop without external charge pump piping, simplifying machine hydraulic plumbing. Hydraulic compensation control automatically matches pump output flow to load demand, maintaining stable flow-pressure output during continuous heavy-duty grading operations.

2. Motor Grader Drop-In Interchangeability: The AT302661 / 83006780’s SAE-C 4-bolt mounting flange and 15-tooth spline shaft are manufactured strictly to John Deere OEM specifications, enabling true drop-in interchangeability with original pumps such as AT457670 and AT455737. During major overhaul or breakdown repair, the pump can be installed directly without modifying piping, couplings, or mounting bases — dramatically reducing downtime and maintenance costs.

3. Series 45 Platform High-Speed High-Efficiency Design (83005896): The 83005896 is built on the Danfoss Series 45 open-circuit platform, featuring a swashplate variable design with maximum speed up to 5,000 rpm and high power density output at 30 cm³/rev displacement. The pump achieves high overall efficiency and low noise operation, with output flow proportional to drive speed and displacement and stepless displacement adjustment from zero to maximum via swashplate angle variation.

4. Wear-Resistant Cast Iron Housing and Long-Life Bearing System: All models feature high-strength cast iron housings with sealed shaft bearings and hydrodynamic cylinder barrel bearings. Critical running surfaces are made from wear-resistant alloy steel with hardening treatment. Optimized internal friction pair design reduces internal leakage, ensuring long-term stable operation under harsh conditions including construction site dust, vibration, and temperature fluctuations.

5. Comprehensive Cross-Reference and Multi-Machine Compatibility System: The AT302661, AT457670, 83006780, AT455737, and 83005896 form a complete cross-reference network, covering hydraulic system repair and replacement needs for John Deere motor graders, Claas combine harvesters, tractors, and other mobile machinery. The same pump body can be adapted to multiple host machines through different control configurations and interface options, providing users with flexible selection solutions.

Application Areas

• John Deere Motor Graders: 670D, 670G, 672D, 672G, 770D, 770G, 772D, 772G, 870D, 870G, 872D, 872G series main hydraulic pumps

• John Deere Tractors: Hydraulic systems for 6-cylinder tractors compatible with AT457670 and similar models

• Combine Harvesters: Claas Torum 780/750, Acros 595 Plus/585/550, Vector 420/410, Sampo (83005896)

• Road Construction Machinery: Motor graders, road rollers — travel drive hydraulic systems

• Agricultural Machinery: High-horsepower tractors, forage harvesters

• Material Handling: Industrial vehicle hydraulic systems requiring high-pressure closed circuits

Expert Maintenance Tips

1. Shaft Alignment and Flange Connection: Concentricity deviation between the pump and drive shaft must be less than 0.05 mm, with angular deviation less than 0.25°. The AT302661 / 83006780 uses an SAE-C 4-bolt flange. Tighten flange bolts in diagonal sequence for even loading. Check that the original mounting base locating step is in good condition — repair the base before installing a new pump if worn.

2. Initial Start-Up Filling and Bleeding: Pre-fill the pump with clean ISO VG46 anti-wear hydraulic oil through the case drain port before installation. Start at the lowest drive speed and observe a steady oil flow from the case drain port free of bubbles. For closed-circuit systems, also verify proper operation of the charge pump circuit and confirm stable charge pressure before gradually applying load.

3. Closed-Circuit Charge Pressure Check (AT302661 / 83006780): After initial startup or repair, connect a pressure gauge to the charge port to verify charge pressure. Abnormal charge pressure may cause sluggish control response or inadequate lubrication of rotating components. Also verify that the high-pressure relief valve pressure cut-off value is within the specified range.

4. Series 45 Variable Control Check (83005896): The 83005896 uses LS (load-sensing) control. After installation, connect a pressure gauge to the LS control port to verify control pressure. With maximum speed of 5,000 rpm, confirm the suction line is unobstructed during high-speed operation to avoid cavitation from insufficient suction.

5. Fluid Cleanliness Management: Use ISO VG46 / VG68 anti-wear hydraulic oil with system filtration of β10 ≥ 75. Closed-circuit systems require high fluid cleanliness. Replace filter elements after the first 500 operating hours, then every 1,000 hours or annually thereafter.

6. Extended Shutdown Protection: For equipment idle longer than 30 days, start the pump once per month and run unloaded for 10 minutes to prevent oil film breakdown between pistons and cylinder block, avoiding dry friction wear on restart.