SY215-8S SY215C SY235-9 11422789 60021665 K3V112DT Hydraulic Main Pump Assembly Compatible with Sany
1. Product Overview & Wholesale Price Range
The Sany SY215-8S / SY235-9 K3V112DT Hydraulic Main Pump Assembly (OEM Part # 11422789 / 60021665 / 11422790 / K3V112DT / K5V112DT) is a high-pressure dual axial piston tandem variable displacement pump engineered for 21-to-23-ton heavy excavators working under continuous digging, quarry loading, and infrastructure earthmoving tasks.
- 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 test video proof
2. Application Worksite Checklist (施工场景清单)
Precision-matched displacement control designed for continuous high hydraulic power output under harsh conditions:
- Heavy Mining & Aggregate Quarrying: High sustained hydraulic flow under 350 Bar working pressure for rapid rock truck loading with Sany SY215-8S excavators.
- Highway Trenching & Infrastructure Projects: Smooth dual-circuit hydraulic displacement during simultaneous boom lifting, arm crowding, and swing movements on SY235-9 machines.
- Deep Foundation Excavation & Earthmoving: Fuel-efficient hydraulic flow matching for long-hour earth excavation and canal digging.
- Demolition & Heavy Concrete Crushing: 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 Sany 21–23 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 SY215-8S main pump assembly (OEM 11422789) 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: K3V112DT 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 Sany SY215-8S 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:
| Category (品类) | Machine Model (适用型号) | OEM Part Number (零件号) | Compatibility (适配品牌) |
|---|---|---|---|
| Hydraulic Main Pump | SY215-8S / SY235-9 | 11422789 / 60021665 / K3V112DT | Compatible with Sany |
| Hydraulic Main Pump | SK330-8 / SK350-8 | LQ10V00018F1 / K3V180DT | Compatible with Kobelco |
| Hydraulic Main Pump | CAT 320C / 320D | 200-3269 / SBS120 | Compatible with Cater**pillar |
| Hydraulic Main Pump | PC400-7 / PC450-7 | 708-2G-00020 / HPV160 | Compatible with Komatsu |
| Main Control Valve | ZAX200-3 / ZX200-3 | 4653603 / 4642948 | Compatible with Hitachi |
| Slewing Motor Assembly | SK120-5 / SH120 | YN15V00001F1 / MSG-85P | Compatible with Kobelco Sumitomo |
| Diesel Engine Assembly | PC400-7 / PC450-7 | 6251-11-1001 / SAA6D125E-3 | Compatible with Komatsu |
5. Frequently Asked Questions & Technical Support (QA 问答专区)
Q1: How do I verify if this main pump fits my Sany SY215-8S or SY235-9 excavator?
A: Check your original pump nameplate for OEM part numbers 11422789, 60021665, or K3V112DT stamp. You can also send us your machine serial number for instant fitment verification.
Q2: My Sany SY215C excavator stalls the engine when lifting the boom. Will replacing the pump solve it?
A: Yes, engine stalling is usually caused by a faulty pump regulator valve failing to stroke down under load. Installing our pre-calibrated Sany SY215-8S pump restores correct engine power matching.
Q3: Is this Sany SY215-8S hydraulic main pump bench tested before shipment?
A: Yes, every single main 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.
