CAT 330B CAT 330C 123-2314 R902026815 Rexroth A8VO120 Hydraulic Main Pump Assembly Compatible with Cat-erpillar Rexroth Liebherr

1. Product Overview & Wholesale Price Range

The Rexroth A8VO120 Hydraulic Main Pump Assembly (OEM Part # 123-2314 / 161-6634 / R902026815 / A8VO120) is a high-capacity dual axial piston tandem variable displacement pump engineered for 25-to-30-ton heavy excavators operating under continuous quarrying, deep trenching, and mass excavation environments.

• Factory Wholesale Price: $4,200 – $7,500 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:

• Heavy Open-Pit Quarrying & Mining: Massive continuous hydraulic flow output under high pressure for rapid rock truck loading with Cat-erpillar CAT 330B and CAT 330C excavators.
• Deep Mass Foundation Excavation: Dual-circuit hydraulic stability during simultaneous boom lifting, bucket curling, and swing cycles on 28-ton excavators.
• Highway Infrastructure & Heavy Trenching: Precise electronically-controlled proportional response for fuel-efficient long-hour earthmoving work.
• Demolition & Heavy Concrete Crushing: Reinforced ductile iron pump housing protects against continuous high hydraulic pressure shockwaves from heavy breaker attachments.

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

If your 25–30 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 A8VO120 main pump assembly (OEM 123-2314) 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: A8VO120 pump regulator power-control spool jammed or hydraulic pilot regulator valve miscalibrated.
  Solution: Recalibrate A8VO120 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 circuit 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 A8VO120 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 A8VO120 main pump fits my CAT 330B or CAT 330C excavator?
A: Check your original pump nameplate for OEM part numbers 123-2314, 161-6634, or A8VO120 stamp. You can also send us your machine serial number for instant fitment verification.

Q2: My CAT 330C excavator slows down after 1 hour of digging. Will replacing the A8VO120 pump solve this?
A: Yes, thermal slowdown is caused by internal pressure leakage inside the worn pump cylinder block. Installing our new Rexroth A8VO120 pump restores full hydraulic speed and digging power.

Q3: Is this CAT 330B Rexroth A8VO120 hydraulic main pump bench tested before shipment?
A: Yes, every single A8VO120 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.