中文
Welcome to Guangzhou HanRui Hydraulic Co., Ltd. We specialize in providing the complete HPV140 excavator hydraulic main pump repair kit (Part No. 708-2G-00020 / 708-2G-01022), precision-manufactured as heavy-duty aftermarket replacement parts compatible with Komatsu engineering machinery equipment. Engineered to exact original dimensions, our overhaul kits allow field technicians and fleet managers to rebuild dual-piston hydraulic main pumps at a fraction of local dealer replacement costs.
Heavy-Duty Application & Working Scenarios
Engineered to withstand continuous high working pressure and demanding earthmoving operations:
- Quarry Mining & Hard Rock Digging: Micro-lapped bronze-faced valve plates and hardened piston shoes withstand 350 Bar peak hydraulic pressure.
- Deep Trenching & Mass Excavation: High volumetric efficiency ensures fast compound movements during continuous boom hoist and arm retraction cycles.
- Hydraulic Breaker Operations: Heavy-duty swashplate cradle bearings and drive shafts absorb violent shock impulses from heavy demolition attachments.
- Fleet Maintenance & Remanufacturing: Pre-packaged overhaul sets enable rapid shop rebuilding of Komatsu 30-to-36-ton main hydraulic pumps.
HPV140 Hydraulic Main Pump Fault Diagnosis & Troubleshooting
Facing excavator hydraulic system failure? Over 90% of field repair inquiries involve internal pump component wear. Here is how our HPV140 Repair Kit resolves them:
1. Engine Stalling / Overloading Under Heavy Load (控泵熄火 / 闷车)
Symptom: Engine bogs down or stalls completely when pulling heavy loads or raising the boom.
Cause: Sticking hydraulic pump regulators or worn swashplate rocker cradles failing to reduce pump displacement.
Solution: Replacing worn swashplates, cam rockers, and servo control pins restores accurate displacement regulation.
2. System Pressure Drop & Weak Digging Force (系统掉压 / 工作无力)
Symptom: Slow attachment speeds, weak digging force, and loss of hydraulic speed as oil temperature rises.
Cause: Micro-abrasion scoring on cylinder block faces, spherical valve plates, or piston shoe surfaces causing internal fluid bypass.
Solution: Precision-ground cylinder blocks and spherical valve plates eliminate inner slippage and rebuild full 350 Bar operating pressure.
3. Hydraulic Oil Leakage at Main Shaft & Housing (主泵漏油)
Symptom: Hydraulic oil leaking continuously around the drive shaft seal or pump intermediate housing joints.
Cause: Worn drive shaft seal journals or hardened rubber seal rings resulting from elevated case drain backpressure.
Solution: Induction-hardened drive shafts combined with premium NOK shaft seals stop fluid leaks completely.
4. Pump Cavitation Noise & Severe Vibration (泵体异响 / 抖动)
Symptom: High-pitched whining noise or severe hydraulic pipe vibration under pump loading.
Cause: Worn piston shoe heads, damaged drive shaft splines, or loose cylinder block center pins.
Solution: Precision-matched piston shoes and press pin assemblies restore quiet, smooth 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 machine operation.
Cause: Excessive friction and severe internal pressure recirculating bypass within worn rotary group components.
Solution: Installing a complete new HPV140 rotary group overhaul kit minimizes internal friction and heat generation.
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 |
|---|---|---|---|---|
| PC300-7 / PC300-8 / PC350-7 | HPV140 / 708-2G-00020 | Hydraulic Pump Repair Kit / Parts | Compatible with Komatsu | Fixes Pressure Drop & Engine Stalling |
| 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 Bore Wear |
| EC210B / EC240B | 14531223 / K3V112DT | Main Hydraulic Pump Assembly | Compatible with Volvo | Fixes Boom Hesitation & Shaft Oil Leakage |
Frequently Asked Questions (Troubleshooting & Fitment)
Q: What is the factory direct price for an HPV140 hydraulic pump repair kit?
A: Direct from our Guangzhou factory, the wholesale price range for a complete HPV140 Hydraulic Main Pump Repair Kit (Part No. 708-2G-00020 / 708-2G-01022) is $380.00 – $850.00 USD per set, depending on specific components included (piston shoes, cylinder block, valve plate, swashplate, shafts). Purchasing directly saves 30% to 50% compared to local OEM dealer prices.
Q: Which Komatsu excavator models use the HPV140 hydraulic pump repair kit?
A: The HPV140 hydraulic main pump repair kit is compatible with 30-to-36-ton Komatsu excavators, including Komatsu PC300-7, PC300LC-7, PC300-8, PC300LC-8, PC350-7, PC350-8, and PC360-7 excavators.
Q: What main parts are included in a full Komatsu HPV140 overhaul kit?
A: A complete Komatsu HPV140 overhaul kit includes: 2 Cylinder Blocks, 18 Piston Shoes, 1 Valve Plate, Cam Rocker / Swashplate Hanger, Press Pins, Center Pins, Drive Shafts, Bearings, and a High-Pressure Seal Kit.
