SH80 SH90 HD307 Vio75 PVC90R 18251-11000 KYB PVC90R Hydraulic Main Pump Assembly Compatible with Sumitomo Kato Yanmar Kubota
The Kayaba KYB PVC90R Hydraulic Main Pump Assembly (OEM Part # 18251-11000 / 172B03-73010 / PVC90R / PVC90) is a dual axial piston tandem variable pump engineered for 8-to-10-ton medium excavators operating under continuous trenching, rock digging, and earthmoving jobs.
- Factory Wholesale Price: $1,800 – $3,500 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 test video proof
Precision-matched flow control engineered to deliver smooth hydraulic action under high-intensity jobsite conditions:
- Urban Infrastructure & Utility Trenching: Fine hydraulic metering for smooth boom and arm excavation in narrow ditches with Sumitomo SH80 excavators.
- Highway Repair & Road Foundation Earthmoving: Sustained working pressure under 300 Bar for rapid bucket loading cycles on Kato HD307 excavators.
- Forestry Land Clearing & Agriculture Drainage: Thermal-resistant seal groups prevent oil bypass during long continuous operating hours on Yanmar Vio75 and Kubota KX080 machines.
- Demolition & Heavy Hammer Attachments: Reinforced pump casing protects against high hydraulic pressure shockwaves from hydraulic hammer operations.
If your 8–10 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 valve plate, causing internal high-pressure oil thermal bypass.
Solution: Replace with a complete drop-in KYB PVC90R main pump assembly (OEM 18251-11000) 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: PVC90R pump regulator 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 bronze layer or cylinder block face failure.
Solution: Flush entire hydraulic piping system, clean main control valve, and install a new PVC90R main pump assembly.
Explore our factory-direct replacement hydraulic components compatible with major global excavator brands:
| Category (品类) | Machine Model (适用型号) | OEM Part Number (零件号) | Compatibility (适配品牌) |
|---|---|---|---|
| Hydraulic Main Pump | Sumitomo SH80 / Yanmar Vio75 | 18251-11000 / PVC90R | Compatible with Sumitomo Yanmar |
| Hydraulic Main Pump | PC30-7 / PC35MR / TB135 | 708-3S-00030 / K3SP36C | Compatible with Komatsu Takeuchi |
| Hydraulic Main Pump | LiuGong 906E / Sany SY60 | 11C0678 / HP5V76 | Compatible with LiuGong Sany |
| Hydraulic Main Pump | CAT 306 / 306E | 458-1033 / AP2D28 | Compatible with Cater*pillar |
| Hydraulic Main Pump | EX120-5 / EX130-5 | 4372038 / HPV091DS | Compatible with Hitachi |
| Hydraulic Main Pump | SK200-6 / SK210-6 | YN10V00003F1 / K3V112DTP | Compatible with Kobelco |
| Slewing Motor Assembly | EX60-1 / EX60-2 | 4188099 / 4255146 | Compatible with Hitachi |
Q1: How do I verify if this KYB PVC90R main pump fits my Sumitomo SH80 or Yanmar Vio75 excavator?
A: Check your original pump nameplate for OEM part numbers 18251-11000, 172B03-73010, or PVC90R stamp. You can also send us your machine serial number for instant fitment verification.
Q2: My Sumitomo SH80 excavator slows down after 1 hour of digging. Will replacing the PVC90R pump solve this?
A: Yes, thermal slowdown is caused by internal pressure leakage inside the worn pump cylinder block. Installing our new KYB PVC90R pump restores full hydraulic speed and digging power.
Q3: Is this Kayaba KYB PVC90R hydraulic main pump bench tested before shipment?
A: Yes, every single PVC90R pump undergoes a 5-step factory bench test, verifying pressure up to 300 Bar and volumetric efficiency above 95%. A live test video is provided before shipping.
