中文
Welcome to Guangzhou HanRui Hydraulic Co., Ltd. We specialize in providing complete Hitachi EX2500, EX3600, EX5500, and EX8000 ultra-large mining excavator main hydraulic pump assemblies and overhaul replacement parts, precision-manufactured as heavy-duty aftermarket replacement parts compatible with Hitachi mining and earthmoving machinery equipment. Engineered to handle extreme continuous hydraulic flow demands, our ultra-class main pumps ensure maximum reliability in open-pit mining environments at factory-direct pricing.
Heavy-Duty Mining Application & Working Scenarios
Engineered for 24/7 continuous ultra-heavy open-pit mining operations under extreme working stress:
- Open-Pit Coal & Copper Mining: Micro-lapped heavy-duty rotary groups maintain maximum volumetric efficiency under 35.0 MPa (350 Bar) pressure.
- Heavy Rock Shovel Loading: High dual/triple-pump flow output ensures fast cycle times for 15-to-40-cubic-meter mining buckets.
- Extreme Climate Mining Sites: Heavy-duty iron casings and high-temp seals withstand continuous oil temperatures up to 95°C without pressure fade.
- Mining Fleet Overhaul & Remanufacturing: Pre-calibrated hydraulic main pump assemblies allow direct drop-in replacement to minimize site downtime.
Hitachi Mining Excavator Main Pump Fault Diagnosis & Troubleshooting
Experiencing hydraulic pump pressure drop or fluid leakage on your mining excavator? Over 90% of site downtime involves these core failures. Here is how our EX2500 / EX3600 / EX5500 / EX8000 Hydraulic Main Pumps resolve them:
1. Engine Stalling / Overloading Under Heavy Digging (控泵熄火 / 闷车)
Symptom: Mining excavator engine bogs down or shuts off completely when curling the bucket or hoisting the boom.
Cause: Sticking pump displacement regulators or worn swashplate control pistons failing to destroke pump displacement.
Solution: Calibrated electronic/hydraulic regulators match pump torque with engine output to prevent engine stalling.
2. Severe System Pressure Drop & Slow Cycle Speeds (系统掉压 / 动作缓慢)
Symptom: Bucket digging force drops significantly and boom hoist speeds slow down when oil reaches working temperature.
Cause: Micro-abrasion scoring on cylinder block faces, valve plates, or piston shoes causing severe internal oil bypass.
Solution: High-alloy cylinder blocks and precision-lapped valve faces eliminate inner slippage and rebuild 350 Bar operating pressure.
3. High-Pressure Hydraulic Fluid Leakage at Main Shaft (主泵高压漏油)
Symptom: Continuous hydraulic oil 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 & Heavy Hose Vibration (泵体剧烈异响 / 抖动)
Symptom: High-pitched howling noise or heavy hydraulic pipe shuddering during pump rotation.
Cause: Worn piston shoe heads, damaged drive shaft splines, or loose swashplate cradle bearings.
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 continuous heavy loading.
Cause: Extreme fluid friction and internal pressure recirculating bypass within worn rotary group components.
Solution: Tight OEM machining tolerances minimize internal friction and heat generation during 24/7 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 |
|---|---|---|---|---|
| EX2500 / EX3600 / EX5500 | EX2500 Main Pump | Mining Hydraulic Main Pump Assembly | Compatible with Hitachi | Fixes Engine Stalling & High-Pressure Oil Leaks |
| Cat 336GC / 336E | 509-5142 / K5V160DTP | Hydraulic Main Pump Assembly | Compatible with Caterpillar | Fixes Low Digging Pressure & Oil Leakage |
| SK330-8 / SK350-8 | LQ10V00018F1 / K3V180DT | Main Hydraulic Pump Assembly | Compatible with Kobelco | Fixes Pressure Instability & Internal Bypass |
| 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 Hitachi EX2500 / EX3600 / EX5500 hydraulic main pumps?
A: Direct from our Guangzhou factory, the wholesale price range for Hitachi EX2500, EX3600, EX5500, and EX8000 mining excavator hydraulic main pump assemblies / overhaul units is $4,500.00 – $18,500.00 USD per set, depending on exact pump displacement and configuration. Purchasing directly saves 30% to 50% compared to local OEM dealer prices.
Q: Which mining excavator models are compatible with this hydraulic main pump assembly?
A: This heavy-duty hydraulic main pump series is compatible with ultra-large Hitachi mining excavators, including Hitachi EX2500, EX2500-5, EX2500-6, EX3600, EX3600-5, EX3600-6, EX5500, EX5500-5, EX5500-6, and EX8000 open-pit mining shovels.
Q: What warranty and quality testing do you provide for mining hydraulic main pumps?
A: Every mining hydraulic main pump undergoes 100% full-flow and high-pressure test bench inspection before shipment. We provide a 12-month quality warranty and full technical support for global mining contractors.
