Description
PVD-2B-40P 4643034 Hydraulic Pump Assembly Overview
The PVD-2B-40P 4643034 Hydraulic Pump assembly manufactured by Tatan is a multi-circuit variable displacement axial piston unit belonging to our Hydraulic Pump Assembly classification. Engineered specifically for Hitachi ZX55, ZX55U, ZX55U-5A, and ZX50U-2 compact excavators, replacing your worn pump with a Tatan complete assembly eliminates compound motion deceleration, restores dozer blade holding pressure, and cures internal thermal bypass across demanding utility trenching and civil construction projects.
Driven directly by the Yanmar 4TNV88 diesel engine and routing pressure flow through the main control valve assembly, this hydraulic pump combines dual variable piston pumps (P1/P2) with an auxiliary gear pump (P3) in a rigid cast housing, ensuring 100% direct bolt-on installation with flywheel drive couplings and chassis hydraulic hard lines.
Key Attributes & Technical Parameters for PVD-2B-40P 4643034 Hydraulic Pump
| Product Category | Hydraulic Pump Assembly | Warranty | 1 Year / 12 Months |
| Specific Valve Model | Nachi PVD-2B-40P Dual Piston + Gear Pump | Brand Name | Tatan |
| Compatible Equipment | Hitachi ZX55 | ZX55U | ZX55U-5A | ZX50U | OEM Part Number | 4643034 / 4642386 / 4629471 |
| Matched Engine Series | Yanmar 4TNV88 Diesel Engine (29.8 kW) | Place of Origin | Guangdong, China |
| Max Relief Pressure | 24.5 MPa (245 bar / 3553 PSI P1/P2) | Auxiliary Gear Pump | 20.6 MPa (206 bar P3 Circuit) |
| 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 |
Comprehensive Hydraulic Pump & Component Inventory
Tatan maintains an extensive inventory of complete multi-flow hydraulic 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 compact excavators, Tatan manufactures and supplies replacement hydraulic main pumps, regulators, and rotating barrel groups across global equipment brands:
Application Scenarios & Buyer Value
When upgrading or replacing your 5.5-ton excavator distribution system with our PVD-2B-40P 4643034 Hydraulic Pump, workshop technicians and fleet managers achieve direct machine uptime:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| Hitachi ZX55 Pump Replacement | 1:1 direct bolt-on installation eliminates tracking pull and restores full digging power on boom and arm cylinders. |
| Compact Machinery Repair Workshops | Avoids the complex labor of internal lapping; saves mechanic hours with pre-tested, factory-calibrated P1/P2/P3 flow balance. |
| Utility & Drainage Contractors | Maintains stable 24.5 MPa operating pressures during continuous auxiliary auger drilling and rock-breaking hammer tasks. |
| Equipment Parts Stockists | High-demand 5.5-ton hydraulic pump inventory packaged in solid export wooden crates ready for immediate global dispatch. |
PVD-2B-40P 4643034 Hydraulic Pump Diagnostic & Troubleshooting Guide
Use this technical guide to diagnose common hydraulic pump symptoms on Hitachi ZX55 series compact excavators:
| Hydraulic Fault Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Arm crowding slows down accompanied by engine bogging | P1/P2 swashplate regulator control spring miscalibration failing to destroke pump displacement as pressure exceeds 20 MPa. | Replace with Tatan 4643034 complete pump assembly with factory-calibrated regulators matched to 4TNV88 engine output. |
| 2. Dozer blade lift stalls when curling bucket simultaneously | P3 gear pump side-plate galling allowing internal pressure drop below 15 MPa under simultaneous operation. | Install Tatan new multi-circuit pump with high-pressure bimetal gear pump section; 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. | 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 multi-flow 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 mini excavator parts replenishment.
📦 Export Wooden Crates
Solid fumigated timber cases lined with thick shockproof foam to prevent transit damage.
PVD-2B-40P 4643034 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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