中文
Welcome to Guangzhou HanRui Hydraulic Co., Ltd. We specialize in providing complete Hitachi 330, 350, and 360-3G (ZX330 / ZX350 / ZX360-3G) excavator hydraulic main pump assemblies and replacement spare parts, precision-manufactured as heavy-duty aftermarket replacement parts compatible with Hitachi heavy engineering machinery equipment. Built to exact OEM mounting dimensions and high-pressure hydraulic flow specifications, our tandem main pumps restore original digging power and operating speed for 30-to-36-ton heavy excavators at factory-direct pricing.
Heavy-Duty Application & Working Scenarios
Engineered to handle heavy mining excavation demands and continuous high-pressure hydraulic output:
- Quarry Mining & Heavy Rock Digging: Micro-finished cylinder blocks and swashplates deliver constant high pressure up to 34.3 MPa (343 Bar).
- Mass Earthmoving & Deep Trenching: High volumetric efficiency guarantees rapid boom hoist and bucket stroke compound movements for 30-36 ton excavators.
- Heavy Demolition Breaker Work: 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.
Hitachi 330 350 360-3G Hydraulic Main Pump Fault Diagnosis & Troubleshooting
Facing hydraulic pressure drop or pump leakage on your Hitachi 330/350 excavator? Over 90% of field repair inquiries involve these main pump failures. Here is how our Hitachi 330 350 360-3G 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 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 heavy 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 |
|---|---|---|---|---|
| Hitachi 330 / 350 / 360-3G | HPV145 / K5V160DTP | Hydraulic Main Pump Assembly | Compatible with Hitachi | Fixes Engine Stalling & Low Digging Pressure |
| Hitachi 450-6 / ZX450-6 / ZX470-6 | Hitachi 450-6 Main Pump | Hydraulic Main Pump Assembly | Compatible with Hitachi | Fixes Engine Stalling & Low Digging Pressure |
| 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 Hitachi 330 / 350 / 360-3G hydraulic main pump assembly?
A: Direct from our Guangzhou factory, the wholesale price range for a complete Hitachi 330 350 360-3G (ZX330 / ZX350 / ZX360-3G) Hydraulic Main Pump Assembly is $2,200.00 – $3,650.00 USD per set, depending on exact regulator and port configuration. Purchasing directly saves 30% to 50% compared to local OEM dealer prices.
Q: Which excavator models are compatible with this Hitachi 330 350 360-3G main pump assembly?
A: This hydraulic main pump assembly is compatible with 30-to-36-ton Hitachi excavators, including Hitachi ZX330, ZX330-3, ZX350, ZX350-3, ZX360-3G, EX300-2, EX300-3, EX300-5, and EX350 excavators.
Q: How do I know if my Hitachi 330 / 350 / 360-3G main pump needs a complete replacement?
A: Signs that your Hitachi main pump requires complete replacement include: severe engine stalling under heavy digging load, rapid hydraulic speed fade when warm, shaft seal oil leaks into the engine flywheel housing, and metal shavings in the case drain filter. Installing a new pre-calibrated pump assembly prevents recurring downtime.
