VIO70 VIO70-2 VIO75 172458-73100 172A03-73010 A10VD43 Hydraulic Main Pump Assembly Compatible with Yanmar

1. Product Overview & Wholesale Price Range

The Yanmar VIO70 / VIO75 Hydraulic Main Pump Assembly (OEM Part # 172458-73100 / 172458-73101 / 172A03-73010 / A10VD43) is a high-pressure dual axial piston tandem variable pump engineered for 7-to-7.5-ton compact excavators operating under continuous urban trenching, landscaping, and foundation digging applications.

• Factory Wholesale Price: $1,650 – $3,200 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-matched flow control designed to deliver smooth hydraulic power across compact excavator jobsites:

• Municipal Utility Trenching & Pipe Laying: Fine hydraulic metering for smooth boom and arm control in narrow ditches with Yanmar VIO70 zero-tail excavators.
• Residential Foundation & Site Earthmoving: Sustained hydraulic working pressure under 250 Bar during foundation digging and site leveling with VIO75 machines.
• Road Infrastructure & Municipal Landscaping: Fast response hydraulic flow for quick bucket loading and grading cycles in compact city spaces.
• Demolition & Small Concrete Breaking: Reinforced 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 Yanmar VIO70 / VIO75 mini 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 VIO70 main pump assembly (OEM 172458-73100) 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: A10VD43 pump regulator power-control spool jammed or pilot pressure relief 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 Yanmar VIO70 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 Yanmar VIO70 or VIO75 excavator?
A: Check your original pump nameplate for OEM part numbers 172458-73100, 172A03-73010, or A10VD43 stamp. You can also send us your machine serial number for instant fitment verification.

Q2: My Yanmar VIO70 excavator stalls the engine when digging. 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 Yanmar VIO70 pump restores smooth engine power matching.

Q3: Is this Yanmar VIO70 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.