Description
PVD-1B-32P 4605638 Hydraulic Pump Assembly Overview
The PVD-1B-32P 4605638 Hydraulic Pump assembly manufactured by Tatan is an integrated multi-flow hydraulic unit belonging to our Hydraulic Pump Assembly classification. Designed specifically for Hitachi ZX35U, ZX35U-2, and ZX30U-2 mini excavators, replacing your worn pump with a Tatan complete assembly eliminates sluggish digging cycle times, corrects track crawling deviation, and cures internal thermal bypass across demanding utility trenching and landscaping projects.
Driven directly by the Yanmar 3TNV88 engine and supplying continuous flow to the main control valve assembly, this hydraulic pump integrates two variable displacement axial piston pumps (P1 and P2) and an auxiliary gear pump (P3) into a single compact housing, ensuring 100% direct bolt-on installation with flywheel drive dampers and suction lines.
Key Attributes & Technical Parameters for PVD-1B-32P 4605638 Hydraulic Pump
| Product Category | Hydraulic Pump Assembly | Warranty | 1 Year / 12 Months |
| Specific Valve Model | Nachi PVD-1B-32P Dual Piston + Gear Pump | Brand Name | Tatan |
| Compatible Equipment | Hitachi ZX35U | ZX35U-2 | ZX30U-2 | OEM Part Number | 4605638 / 4612128 / 4642385 |
| Matched Engine Series | Yanmar 3TNV88 Diesel Engine (21.2 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 Regulator |
| Machinery Test Report | Provided (100% Bench Dual Flow Tested) | Video Outgoing-Inspection | Provided Before Shipping |
| Hydraulic Fluid Spec | ISO VG 46 Anti-Wear Hydraulic Oil | Packaging | Export Wooden Box Packaging |
Supported Excavator Machinery Brands & Hydraulic Lineup
In addition to Hitachi mini 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 mini excavator distribution system with our PVD-1B-32P 4605638 Hydraulic Pump, workshop technicians and fleet managers achieve direct machine uptime:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| Hitachi ZX35U 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. |
| Mini Excavator Parts Stockists | High-demand 3.5-ton hydraulic pump inventory packaged in solid export wooden crates ready for immediate global dispatch. |
PVD-1B-32P 4605638 Hydraulic Pump Diagnostic & Troubleshooting Guide
Use this technical guide to diagnose common hydraulic pump symptoms on Hitachi ZX35U series mini excavators:
| Hydraulic Fault Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Single track stalls or slows down when curling bucket | P1 or P2 rotary group volumetric loss or swashplate regulator spool imbalance starving one travel circuit under compound load. | Replace with Tatan 4605638 complete pump assembly with factory-calibrated dual flow-sharing balance. |
| 2. Rapid loss of digging power once oil reaches operating temperature | Excessive internal clearance between cylinder barrel face and bimetal valve plate allowing fluid to bypass into casing. | Install Tatan new hydraulic pump with micro-lapped bimetal valve plates (< 0.003 mm tolerance); flush hydraulic tank 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 oil. | Stop machine immediately to prevent valve chest contamination; install fresh complete pump and clean suction strainers. |
| 4. Loud whining noise & pump body vibration | Suction port O-ring hardening or restricted inlet strainer causing fluid aeration and swashplate flutter under load. | Replace suction line seals, fill with fresh ISO VG 46 anti-wear hydraulic oil, and mount new balanced pump unit. |
Transport Packaging & Certified Quality Assurance
Precision hydraulic piston pumps require absolute vibration and moisture protection. Every Tatan unit is sealed and bolted in solid timber export 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-1B-32P 4605638 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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