中文
Welcome to Guangzhou HanRui Hydraulic Co., Ltd. We specialize in providing complete KYB 923 / K3V122 / K3V112 excavator hydraulic main pump assemblies and replacement spare parts, precision-manufactured as heavy-duty aftermarket replacement parts compatible with Kayaba, Kawasaki, Kobelco, Hyundai, Doosan, and Volvo engineering machinery equipment. Built to exact OEM mounting and flow specifications, our tandem hydraulic main pumps ensure full digging torque and smooth multi-function movements for 20-to-22-ton excavators at factory-direct pricing.
Heavy-Duty Application & Working Scenarios
Engineered to handle medium and heavy excavator digging demands and continuous high-pressure hydraulic output:
- Quarry Mining & Earthmoving: Micro-finished cylinder blocks and swashplates deliver constant working pressure up to 34.3 MPa (343 Bar).
- Continuous Deep Trenching: High volumetric efficiency guarantees rapid boom hoist and bucket stroke compound movements for 20-22 ton excavators.
- Hydraulic Breaker Operations: Reinforced piston shoes and cradle bearings absorb violent hydraulic shock spikes from breaker attachments.
- Fleet Replacement & Overhaul: Pre-calibrated hydraulic main pump assemblies allow direct drop-in bolt-on replacement to minimize site downtime.
KYB 923 K3V122 Hydraulic Main Pump Fault Diagnosis & Troubleshooting
Facing hydraulic pressure drop or pump leakage on your excavator? Over 90% of field repair inquiries involve these main pump failures. Here is how our KYB 923 K3V122 Hydraulic Main Pump Assembly resolves them:
1. Engine Stalling / Overloading Under Heavy Digging (控泵熄火 / 闷车)
Symptom: Excavator engine bogs down or stalls completely when pulling heavy digging loads or raising the boom.
Cause: Sticking pump regulators or worn swashplate cradle bearings failing to destroke pump displacement under load.
Solution: Calibrated hydraulic regulators ensure accurate power-matching with the engine to prevent engine stalling.
2. System Pressure Drop & Slow Cycle Speeds (系统掉压 / 动作无力)
Symptom: Slow cylinder attachment movements, weak bucket breakout force, and speed fade as hydraulic oil temperature rises.
Cause: Internal oil bypass caused by micro-abrasion scoring on cylinder block faces or worn piston shoes.
Solution: High-grade alloy cylinder barrels and precision-lapped valve faces eliminate inner slippage and rebuild full operating pressure.
3. Hydraulic Fluid Leakage at Main Shaft & Housing (主泵漏油)
Symptom: Hydraulic fluid leaking around the front drive shaft oil seal or intermediate pump housing joints.
Cause: Shaft seal journal grooving wear or seal lip hardening caused by high case drain backpressure.
Solution: Induction-hardened drive shafts combined with premium NOK high-pressure shaft seals stop oil leaks completely.
4. Pump Cavitation Noise & Severe Vibration (泵体异响 / 抖动)
Symptom: High-pitched whining noise or heavy hydraulic hose shuddering during pump rotation under load.
Cause: Worn piston shoe heads, damaged drive shaft splines, or loose swashplate cradle supports.
Solution: Precision-matched piston shoes and heavy-duty cradle bearings restore smooth, vibration-free hydraulic rotation.
5. Hydraulic Oil Overheating & Thermal Fade (主泵发热高温)
Symptom: Hydraulic tank oil temperature spikes rapidly after 30 minutes of continuous working.
Cause: Excessive friction heat and internal pressure recirculating bypass within worn rotary group components.
Solution: Tight OEM machining tolerances minimize internal friction and heat generation during long working shifts.
Hot Popular Excavator Hydraulic Main Pumps & Spare Parts Catalog
Explore our factory-direct aftermarket catalog for major construction equipment brands:
| Machine Model (型号) | Part Number (零件号) | Component Name (品名) | Compatible Brand (适配品牌) | Target Fault Solved |
|---|---|---|---|---|
| SK200-8 / R210-7 / EC210B | KYB 923 / K3V122 / K3V112DT | Hydraulic Main Pump Assembly | Compatible with Kobelco / Hyundai / Kayaba | Fixes Engine Stalling & Low Digging Pressure |
| SK130-8 / R140LC-9 / DX140 | K7V63 / K3V63DT Kit | Main Pump Overhaul Repair Kit | Compatible with Kobelco / Hyundai / Kawasaki | Fixes Engine Stalling & Low Pressure Loss |
| Cat 336GC / 336E | 509-5142 / K5V160DTP | Hydraulic Main Pump Assembly | Compatible with Cater.pillar | Fixes Low Digging Pressure & Oil Leakage |
| EX200-5 / EX200-6 / ZX200 | HPV0102 / HPV102 Parts Kit | Main Pump Overhaul Repair Kit | Compatible with Hitachi | Fixes Casing Leakage & Bearing Seat Wear |
| PC300-8 / PC350-8 | 708-2G-00020 / HPV160 | Hydraulic Main Piston Pump Parts | Compatible with Komatsu | Fixes Slow Movement & Pump Noise |
Frequently Asked Questions (Troubleshooting & Fitment)
Q: What is the price range for a complete KYB 923 / K3V122 hydraulic main pump assembly?
A: Direct from our Guangzhou factory, the wholesale price range for a complete KYB 923 / K3V122 / K3V112 Hydraulic Main Pump Assembly is $1,250.00 – $2,550.00 USD per set, depending on exact port configuration and order volume. Purchasing directly saves 30% to 50% compared to local OEM dealer prices.
Q: Which 20-22 ton excavator models are compatible with KYB 923 and K3V122 main pumps?
A: KYB 923 and K3V122 / K3V112 hydraulic main pumps are compatible with 20-to-22-ton excavators, including Kobelco SK200-6, SK200-8, SK210-8, Hyundai R210-7, R215-7, Doosan DX225, Sumitomo SH200, Kato HD820, and Volvo EC210B excavators.
Q: How do I know if my KYB 923 / K3V122 hydraulic main pump needs a complete replacement?
A: Signs that your main pump requires complete replacement include: severe engine stalling under load, rapid hydraulic speed fade when warm, continuous shaft seal leakage, and metal shavings in the case drain filter. Installing a new pre-calibrated pump assembly prevents recurring downtime.
