Description
K3V280 4635645 Hydraulic Pump Assembly Overview
The K3V280 4635645 Hydraulic Pump assembly manufactured by Tatan is a massive tandem variable displacement axial piston unit belonging to our Hydraulic Pump Assembly classification. Engineered specifically for Hitachi ZX870, ZX870-3, ZX870-5G, and ZX870LCH 87-ton mining excavators, replacing your worn pump with a Tatan complete assembly eliminates compound motion deceleration, restores digging breakout power, and cures internal thermal bypass across demanding quarry and heavy open-pit mining operations.
Driven directly by the Isuzu 6WG1 diesel engine and routing pressure flow through the main control valve assembly, this K3V280 4635645 Hydraulic Pump combines dual variable piston pumps (2 × 280 cm³/rev) with an integrated auxiliary pilot gear pump, ensuring 100% direct bolt-on installation with flywheel drive couplings and chassis hydraulic hard lines.
Key Attributes & Technical Parameters for K3V280 4635645 Hydraulic Pump
| Product Category | Hydraulic Pump Assembly | Warranty | 1 Year / 12 Months |
| Specific Valve Model | Kawasaki K3V280 / HPK300AS Tandem Piston Pump | Brand Name | Tatan |
| Compatible Equipment | Hitachi ZX870 | ZX870-3 | ZX870-5G | ZX870LCH | OEM Part Number | 4635645 / YB60000246 / YA00003076 |
| Matched Engine Series | Isuzu 6WG1 / 6WG1-XYSA Diesel (397 kW / 532 HP) | Place of Origin | Guangdong, China |
| Max Operating Pressure | 31.9 – 34.3 MPa (319 – 343 bar / 4975 PSI) | Power Boost Pressure | 36.3 MPa (363 bar / 5265 PSI Boost) |
| Spool Precision Spec | Micro-Lapped Bimetal Plate < 0.003 mm | Quality Status | 100% Brand New Assembly with Regulators |
| Machinery Test Report | Provided (100% Bench Flow Tested) | Video Outgoing-Inspection | Provided Before Shipping |
| Hydraulic Fluid Spec | ISO VG 46 Anti-Wear Hydraulic Oil | Packaging | Export Wooden Box Packaging |
Mining Excavator Hydraulic Pump & Component Inventory
Tatan maintains extensive factory inventory of complete tandem piston pumps, regulators, pilot gear pumps, cylinder block rebuild kits, and bimetal valve plates across global machinery lines:
Supported Excavator Machinery Brands & Global Coverage
In addition to Hitachi mining excavators, Tatan manufactures and supplies replacement hydraulic main pumps, regulators, and rotating barrel groups across global equipment brands:
Application Scenarios & Buyer Value
When contractors search to compare Hitachi ZX870 hydraulic pump replacement cost and upgrade their machine with our K3V280 4635645 Hydraulic Pump, they secure measurable field reliability and lower cost per hour:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| Hitachi ZX870 Pump Replacement | 1:1 direct bolt-on installation eliminates tracking pull and restores full digging power on boom and arm cylinders. |
| Mining Equipment Repair Workshops | Avoids the complex labor of internal lapping; saves mechanic hours with pre-tested, factory-calibrated dual flow balance. |
| Quarry & Open-Pit Mining Fleets | Maintains stable 34.3 MPa operating pressures during continuous heavy rock-breaker hammering and deep quarry trenching. |
| Heavy Equipment Parts Stockists | High-demand 87-ton hydraulic pump inventory packaged in solid export wooden crates ready for immediate global dispatch. |
K3V280 4635645 Hydraulic Pump Diagnostic & Troubleshooting Guide
Use this technical guide to diagnose common hydraulic pump symptoms on Hitachi ZX870 series mining excavators:
| Hydraulic Fault Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Boom hoisting slows down accompanied by engine bogging | K3V280 negative flow control regulator power-limiting spool sticking failing to destroke pump displacement as pressure exceeds 30 MPa. | Replace with Tatan complete K3V280 4635645 Hydraulic Pump assembly with factory-calibrated regulators matched to 6WG1 engine output. |
| 2. Unequal flow delivery across compound digging circuits | P1 or P2 rotary group volumetric loss or swashplate servo piston seal degradation causing uneven flow output under 1,000 L/min load. | Install Tatan new tandem pump with precision-matched dual rotating barrel groups; flush contaminated oil lines. |
| 3. Fine bronze glitter & copper dust in return filter element | Piston slipper pads worn thin or separated from swashplate thrust plate due to contaminated hydraulic fluid under heavy hammer vibration. | Stop machine immediately to prevent control valve contamination; install fresh complete pump and clean suction strainers. |
| 4. Digging breakout fades rapidly once oil reaches 75°C | Excessive clearance between cylinder barrel face and bimetal valve plate allowing high-pressure fluid to bypass into casing. | Install Tatan new hydraulic pump with micro-lapped bimetal valve plates (< 0.003 mm tolerance) and new suction O-rings. |
Transport Packaging & Certified Quality Assurance
Precision tandem hydraulic pumps require absolute shock protection. Every Tatan unit is sealed and packaged in solid export timber crates:
✈️ Express Air Courier
Partnered with DHL, FedEx, and UPS for 3-7 day priority delivery worldwide.
🚢 Sea Cargo Freight
LCL and FCL container ocean freight for bulk equipment parts replenishment.
📦 Export Wooden Crates
Solid fumigated timber cases lined with thick shockproof foam to prevent transit damage.
K3V280 4635645 Hydraulic Pump FAQ & Related Categories
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote.
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