Full‑spec OEM interchangeability Direct drop‑in replacement for AT302661, cross‑compatible with 83006780 and AT455737. Built on Sauer‑Danfoss 90R075 platform with strictly matched SAE‑C flange and 15‑tooth spline shaft, no modification required during installation.

Stable closed‑loop hydraulic performance 75 cc displacement, 350 bar rated pressure and 420 bar peak pressure. Integrated 14 cc built‑in charge pump plus hydraulic compensation control delivers consistent flow‑pressure output under continuous heavy‑load grading operation.

Harsh‑condition durability Optimized internal friction pairs reduce internal leakage. Reliable continuous‑running performance for long‑hour jobsite operation, cutting unexpected downtime for John Deere motor graders.

Perfect fit for target grader fleet Purpose‑built for John Deere D/G‑series motor graders (670D‑872G). Matches original system parameters to retain full machine hydraulic response after pump overhaul.

Cost‑effective aftermarket solution Delivers OEM‑equivalent performance for equipment repair and overhaul, offering a practical alternative to expensive original factory units.

Q1: What machine does the AT302661 hydraulic pump fit?

A: The AT302661 90R075 piston pump is the main closed-loop hydraulic pump specifically designed for John Deere D/G series motor graders, including 670D, 670G, 672G, 770D, 770G, 772G, 870D and 870G models.

Q2: Are AT302661, 83006780 and AT455737 interchangeable?

A: Yes. AT302661 is fully OEM interchangeable with part numbers 83006780 and AT455737. All three part numbers correspond to the same Sauer Danfoss 90R075 pump specification with identical mounting and performance parameters for direct drop-in replacement.

Q3: What is the core specification of the AT302661 hydraulic pump?

A: This 90R075 closed-loop piston pump features 75cc displacement, 350bar rated pressure and 420bar peak pressure. It comes with a built-in 14cc charge pump and hydraulic compensation control, matching original John Deere grader hydraulic system standards.

Q4: What is the difference between AT302661 pump and original factory pump?

A: Our AT302661 aftermarket pump strictly follows the Sauer Danfoss 90R075 original design, with the same SAE C flange, 15-tooth spline shaft and hydraulic control parameters. It provides OEM-equivalent performance at a more cost-effective price for grader repair and overhaul.

Q5: Does the AT302661 pump require modification during installation?

A: No modification is needed. The AT302661 hydraulic pump retains 100% original installation dimensions and interface standards, perfectly replacing the original 83006780 and AT455737 pumps for plug-and-play installation on John Deere motor graders.

Q6: What causes low pressure or weak performance of John Deere grader hydraulic pump?

A: Most low-pressure issues on John Deere D/G graders are caused by worn 90R075 main pump internal components and increased internal leakage. Replacing with a brand-new AT302661 pump can restore standard system pressure and original working efficiency.

Q7: Is the AT302661 90R075 pump suitable for long-term heavy-duty operation?

A: Yes. The AT302661 closed-loop variable piston pump is engineered for continuous heavy-load construction conditions. With stable hydraulic compensation and high-pressure resistance design, it supports long-hour grading operations and effectively reduces equipment downtime.

Q8: What after-sales support do you provide for the AT302661 hydraulic pump?

A: We provide factory-tested AT302661 hydraulic pumps with complete compatibility for John Deere motor graders. Global shipping, professional technical support and standard aftermarket warranty are available for all 90R075 pump orders.