60D 60G 75D 85G 130G AT318382 AT335839 Hydraulic Main Pump Assembly Compatible with JD

1. Product Overview & Wholesale Price Range

The JD60D / 60G / 75D / 85G / 130G Hydraulic Main Pump Assembly (OEM Part # AT318382 / AT318383 / AT335839 / AT385202 / AT353278) is a dual axial piston variable displacement pump engineered for compact and mid-size excavators operating under continuous trenching, land clearing, and infrastructure construction jobs.

• Factory Wholesale Price: $1,850 – $3,800 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-matched flow control designed to deliver smooth hydraulic power across compact excavator jobsites:

• Municipal Utility Trenching & Cable Laying: Fine hydraulic metering for smooth boom and arm excavation in narrow ditches with JD 60G and 75D excavators.
• Residential Infrastructure & Foundation Prep: Sustained hydraulic working pressure under 280 Bar during foundation digging and site leveling with JD 85G excavators.
• Agricultural Drainage & Forestry Clearing: Thermal-resistant seal groups prevent oil bypass during long continuous operating hours on JD 130G excavators.
• Demolition & Small Concrete Breaking: Heavy-duty pump casing built to absorb pressure shockwaves caused by hydraulic hammer attachments.

3. Hydraulic Main Pump Troubleshooting & Diagnostic Guide (液压泵常见故障排查)

If your JDmini or mid excavator is exhibiting hydraulic system failure, consult the diagnostic guide below:

• Fault 1: Cold Machine Operates Normally, But Machine Slows Down & Drops Pressure After 1 Hour (冷车正常,热车掉压发慢)
  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 60D/75D/85G main pump assembly (OEM AT318382 / AT335839) or overhaul the internal rotary group kit.
• Fault 2: Engine Stalls or Overloads When Actuating Hydraulic Boom/Arm (憋车/发动机过载熄火)
  Root Cause: Pump regulator power-control spool jammed or hydraulic pilot regulator valve miscalibrated.
  Solution: Recalibrate pump regulator pilot pressure or replace the complete regulator assembly to restore engine horsepower 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 gear pilot pump relief pressure.
• 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 bearings.
  Solution: Replace suction line seals, flush hydraulic fluid tank, and replace drive shaft roller 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 JD 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 excavator brands:

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

Q1: How do I verify if this main pump fits my JD 60D, 75D, or 85G excavator?
A: Check your original pump nameplate for OEM part numbers AT318382, AT335839, or AT385202 stamp. You can also send us your machine serial number for instant fitment verification.

Q2: My JD 75D excavator stalls the engine when lifting the boom. Will replacing the pump solve it?
A: Yes, engine stalling is usually caused by a sticking pump regulator valve failing to de-stroke under load. Installing our pre-calibrated JD main pump restores smooth engine power matching.

Q3: Is this JD hydraulic main pump bench tested before shipment?
A: Yes, every single main pump undergoes a 5-step factory bench test, verifying pressure up to 280 Bar and volumetric efficiency above 95%. A live test video is provided before shipping.