中文
Welcome to Guangzhou HanRui Hydraulic Co., Ltd. We specialize in providing the complete HPV145 excavator hydraulic main pump cylinder block and swash plate assembly (including 9-hole cylinder barrels, piston shoes, copper-lined blocks, and swashplate cradles), precision-manufactured as heavy-duty aftermarket replacement parts compatible with Hitachi engineering machinery equipment. Cast from high-density alloy steel with precision-finished piston bores and micro-lapped end faces, our cylinder blocks ensure maximum volumetric efficiency and pressure holding capability under extreme working loads.
Heavy-Duty Application & Working Scenarios
Engineered to endure severe continuous high-pressure reciprocating piston friction without thermal deformation:
- Quarry Mining & Heavy Excavation: Copper-bushed cylinder bores withstand continuous reciprocating piston loads up to 350 Bar working pressures.
- Continuous Deep Trenching: Micro-finished cylinder end faces maintain 100% fluid sealing contact against the valve plate for instant hydraulic flow response.
- Hydraulic Breaker Operations: High-density alloy body prevents fatigue cracking and bore galling caused by hammer shock impulses.
- Main Pump Overhaul & Remanufacturing: Precision OEM-spec mounting dimensions enable direct drop-in replacement during shop overhauls.
HPV145 Hydraulic Pump Cylinder Block Fault Diagnosis & Troubleshooting
Experiencing loss of hydraulic breakout force or oil temperature spikes? Worn cylinder blocks account for over 85% of internal pump slippage cases. Here is how our HPV145 Cylinder Block & Swash Plate Assembly resolves them:
1. Cylinder End Face Scoring & Internal Pressure Drop (缸体端面磨损 / 掉压)
Symptom: Slow attachment speeds, weak digging force, and loss of hydraulic speed as oil gets hot.
Cause: Deep scratches or uneven wear on the cylinder block mating face caused by contaminated oil or heat thermal expansion.
Solution: Precision-milled, copper-bushed cylinder faces restore 100% sealing contact with the valve plate, rebuilding full 350 Bar pressure.
2. Piston Bore Galling & Engine Stalling Under Load (柱塞孔拉伤 / 闷车)
Symptom: The engine bogs down or stalls completely, or pistons seize tightly inside the cylinder block bores.
Cause: Extreme friction heat destroying the lubrication film inside the piston bores, causing copper pick-up or metal seizing.
Solution: CNC honed, bimetallic copper-bushed bores ensure smooth piston stroke friction and prevent piston lockup.
3. Center Pin Bushing Wear & Severe Pump Vibration (中心孔磨损 / 抖动异响)
Symptom: Heavy knocking noise or severe vibration shaking the main pump casing under rotation.
Cause: Loose center pin spring seating or ovality wear inside the cylinder block center bore.
Solution: Precision-ground center pin bore journals eliminate rotational runout eccentric chatter and extend bearing life.
4. Hydraulic Oil Overheating & Volumetric Efficiency Fade (主泵发热高温)
Symptom: Main pump casing temperature spikes rapidly within 30 minutes of operation.
Cause: High fluid friction caused by continuous internal high-pressure fluid recirculating bypass across worn cylinder block faces.
Solution: Ultra-tight tolerance machining minimizes internal fluid bypass, keeping working oil temperatures low.
5. Cylinder Spline Wear & Drive Slipping (缸体花键磨损 / 传递失效)
Symptom: Slipping rotation or power transmission lag between the drive shaft and cylinder barrel.
Cause: Internal drive shaft spline teeth inside the cylinder center bore worn down by torsional fatigue.
Solution: Induction-hardened internal drive splines ensure positive, slop-free torque transmission from drive shaft to pistons.
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 |
|---|---|---|---|---|
| ZX330 / ZX350 / EX300 | HPV145 Cylinder Block | Hydraulic Pump Cylinder Block / Swash Plate | Compatible with Hitachi | Fixes End Face Wear & Internal Pressure Drop |
| Cat 336GC / 336E | 509-5142 / K5V160DTP | Hydraulic Main Pump Assembly | Compatible with Cater.pillar | Fixes Engine Stalling & Low Digging Pressure |
| SK330-8 / SK350-8 | LQ10V00018F1 / K3V180DT | Main Hydraulic Pump Assembly | Compatible with Kobelco | Fixes Pressure Instability & Internal Bypass |
| PC300-8 / PC350-8 | 708-2G-00020 / HPV160 | Hydraulic Main Piston Pump Parts | Compatible with Komatsu | Fixes Slow Movement & Pump Noise |
| EX200-5 / ZX200 | HPV0102 / HPV102 Housing | Hydraulic Pump Casing / Body | Compatible with Hitachi | Fixes Casing Leakage & Bearing Seat Wear |
Frequently Asked Questions (Troubleshooting & Fitment)
Q: What is the price range for an HPV145 hydraulic pump cylinder block?
A: Direct from our Guangzhou factory, the wholesale price range for an HPV145 Hydraulic Pump Cylinder Block (Cylinder Barrel / Piston Block) is $150.00 – $480.00 USD per piece, depending on copper bush lining configuration and order quantity. Purchasing directly saves 30% to 50% compared to local OEM dealer prices.
Q: Which excavator models use the HPV145 cylinder block and swash plate assembly?
A: The HPV145 cylinder block is compatible with 30-to-35-ton Hitachi excavators, including Hitachi ZX330, ZX330-3, ZX350, ZX350-3, EX300-2, EX300-3, EX300-5, and EX350 excavators equipped with HPV145 main hydraulic pumps.
Q: How do I know if my excavator hydraulic pump cylinder block needs replacement?
A: Signs that an HPV145 cylinder block requires replacement include: deep circular grooves or scratches on the cylinder end face, loose or seized piston bores, rapid pressure loss when hydraulic oil gets hot, and excessive metal shavings inside the main pump case drain filter.
