670D 670G 672G 770G AT302661 AT302662 Hydraulic Piston Main Pump Assembly Compatible with Danfoss

1. Product Overview & Wholesale Price Range

The Danfoss AT302661 Hydraulic Motor Grader Pump Assembly (OEM Part # AT302661 / AT302662 / ERR100 / ERR130) is a high-pressure axial piston variable displacement main pump engineered for Danfoss heavy motor graders operating under continuous road grading, slope leveling, and earthworking operations.

• Factory Wholesale Price: $2,800 – $5,200 USD (Direct manufacturer pricing — Save up to 50% vs regional dealer markups)
• MOQ & Bulk Discount: 1 Unit (Tiered wholesale discounts available for batch container orders)
• Lead Time: 1–3 business days (Large factory stock ready for immediate worldwide dispatch)
• Warranty: 12 Months full replacement warranty with 100% bench test video proof

2. Application Worksite Checklist (施工场景清单)

Precision displacement matching engineered for smooth blade control under continuous heavy grading loads:

• Highway Infrastructure & Earth Levelling: Sustained hydraulic working pressure under 300 Bar for smooth blade lift, tilt, and side-shift control on Danfoss 670G motor graders.
• Airport Runway & Asphalt Sub-Base Preparation: Fine pressure metering ensures micro-precise grader blade positioning for sub-grade flatness.
• Mining Haul Road Maintenance & Scraping: Heavy-duty pump housing absorbs shock loads from heavy rock scraping on Danfoss 770G graders.
• Agricultural Drainage & Snow Plowing: Thermal-resistant shaft seals prevent oil bypass during long continuous operating cycles in harsh climates.

3. Motor Grader Hydraulic Pump Troubleshooting Guide (平地机液压泵故障排查)

If your Danfoss motor grader is exhibiting hydraulic control failure, consult the diagnostic guide below:

• Fault 1: Slow Moldboard Blade Lift & Pressure Loss After 1 Hour (热车铲刀举升缓慢掉压)
  Root Cause: Thermal expansion wear gap between the piston shoes, cylinder block, and valve plate, causing internal high-pressure oil thermal bypass.
  Solution: Replace with a complete drop-in AT302661 main pump assembly (OEM AT302661 / AT302662) or overhaul the internal rotary group kit.
• Fault 2: Engine Stalls or Lacks Hydraulic Force When Articulating or Steering (憋车/转向铲刀无力)
  Root Cause: Danfoss ERR100 pump load-sensing (LS) control spool jammed or pressure compensator valve miscalibrated.
  Solution: Recalibrate pump LS regulator valve or replace the complete regulator assembly to restore engine power matching.
• Fault 3: Hydraulic Oil Leakage From Drive Shaft Seal Area (主驱动轴封高压串油漏油)
  Root Cause: Clogged casing drain line causing excessive internal housing backpressure, blowing out the front drive shaft skeleton seal.
  Solution: Flush housing drain lines, replace front drive shaft seal, and check pilot pressure relief settings.
• Fault 4: Abnormal Cavitation Noise or Severe Vibration From Main Pump (泵体异响抖动/气蚀)
  Root Cause: Air suction at inlet suction pipe, contaminated hydraulic tank filter, or worn drive shaft roller bearings.
  Solution: Replace suction line seals, flush hydraulic fluid tank, and replace drive shaft bearings.
• Fault 5: Black Metallic Filings Found Inside Hydraulic Tank Filter (油箱内有黑粉或金属屑)
  Root Cause: Severe friction galling on swashplate shoe bronze layer or cylinder block face failure.
  Solution: Flush entire hydraulic piping system, clean main control valve, and install a new AT302661 main pump assembly.

4. Hot Machinery Replacement Parts Recommendation (5大品类热门推荐表)

Explore our factory-direct replacement hydraulic components compatible with major global machinery brands:

5. Frequently Asked Questions & Technical Support (QA 问答专区)

Q1: How do I verify if this AT302661 pump fits my Danfoss 670G or 770G motor grader?
A: Check your original pump nameplate for OEM part numbers AT302661, AT302662, or Danfoss ERR100 stamp. You can also send us your machine serial number for instant fitment verification.

Q2: My Danfoss 670G grader blade moves slowly when the hydraulic oil heats up. Will replacing the pump fix this?
A: Yes, slow blade lifting under thermal heat is caused by internal oil bypass inside the worn pump cylinder block. Installing our pre-tested AT302661 pump restores full hydraulic speed and lift torque.

Q3: Is this Danfoss AT302661 hydraulic main pump bench tested before shipment?
A: Yes, every single main pump undergoes a 5-step factory bench test, verifying load-sensing (LS) response, working pressure up to 300 Bar, and volumetric efficiency above 95%. A live test video is provided before shipping.