CAT 320B CAT 320C 114-0329 R902026809 Rexroth A8VO80 Hydraulic Main Pump Assembly Compatible with Cat-erpillar Rexroth Liebherr

1. Product Overview & Wholesale Price Range

The Rexroth A8VO80 Hydraulic Main Pump Assembly (OEM Part # 114-0329 / R902026809 / R902000000 / A8VO80) is a high-efficiency dual axial piston tandem variable displacement pump engineered for 18-to-22-ton excavators operating under continuous open-pit trenching, rock digging, and mass excavation environments.

• Factory Wholesale Price: $3,200 – $5,800 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 pressure test video proof

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

Precision-matched flow control designed to deliver smooth hydraulic displacement under continuous 350 Bar working pressure:

• Urban Infrastructure & Utility Trenching: Fine hydraulic metering for smooth boom and arm excavation in narrow ditches with Cat-erpillar CAT 320B excavators.
• Road Repair & Foundation Earthmoving: Sustained working pressure for rapid bucket loading cycles on CAT 320C excavators.
• Agricultural Irrigation & Farm Drainage: Thermal-resistant seal groups prevent oil bypass during long continuous operating hours in hot climates.
• Demolition & Small Breaker Operations: Reinforced pump housing protects against severe pressure shockwaves from hydraulic hammer attachments.

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

If your 18–22 ton 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 distributor valve plate, causing internal high-pressure oil thermal bypass.
  Solution: Replace with a complete drop-in Rexroth A8VO80 main pump assembly (OEM 114-0329) 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: A8VO80 pump regulator power-control spool jammed or hydraulic pilot regulator valve miscalibrated.
  Solution: Recalibrate A8VO80 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 hydraulic inlet lines, contaminated oil suction filter, or worn drive shaft support 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 Rexroth A8VO80 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 Rexroth A8VO80 main pump fits my CAT 320B or CAT 320C excavator?
A: Check your original pump nameplate for OEM part numbers 114-0329, R902026809, or A8VO80 stamp. You can also send us your machine serial number for instant fitment verification.

Q2: My CAT 320C excavator slows down after 1 hour of digging. Will replacing the A8VO80 pump solve this?
A: Yes, thermal slowdown is caused by internal pressure leakage inside the worn pump cylinder block. Installing our new Rexroth A8VO80 pump restores full hydraulic speed and digging power.

Q3: Is this CAT 320B Rexroth A8VO80 hydraulic main pump bench tested before shipment?
A: Yes, every single A8VO80 pump undergoes a 5-step factory bench test, verifying pressure up to 350 Bar and volumetric efficiency above 95%. A live test video is provided before shipping.