Gear Pump for Hitachi ZX210W-3 Excavator
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Hitachi ZX210W-3 Excavator 4649265
Gear Pump for Hitachi ZX210W-3 Excavator | 4649265
Product Overview
The gear pump is a vital component in your Hitachi ZX210W-3 excavator's hydraulic system, serving as the dedicated power source for the pilot control circuit. This precision-engineered pump supplies stable, low-pressure oil flow to operate the pilot control valves, enabling precise and responsive control of all machine functions including boom, arm, bucket, swing, and travel movements.
The Hitachi ZX210W-3 wheeled excavator features a sophisticated hydraulic system comprisingtwo variable displacement piston pumps (main pumps) plus two gear pumpsfor auxiliary functions . This genuine Hitachi gear pump (Part No. 4649265) is specifically designed to meet the exacting requirements of the ZX210W-3 pilot circuit, ensuring smooth, reliable machine operation in construction, road building, and utility applications.
This is agenuine Hitachi original equipment part, manufactured to precise OEM specifications for perfect fit, reliable performance, and long service life.
Technical Specifications
Parameter
Specification
Part Number
4649265
Manufacturer
Hitachi Construction Machinery
Pump Type
Fixed displacement gear pump
Application
Pilot circuit / Control system
Rated Flow
27.7 L/min (system specification)
Rated Pressure
3.9 MPa (pilot circuit pressure)
Mounting Type
Flange mount / Tandem mount with main pump
Please verify specifications with your machine's technical manual or existing component.
Genuine Hitachi Quality
Component
Feature
Benefit
Gear Set
Precision-ground hardened steel
Consistent flow, minimal wear
Housing
High-strength cast iron
Rigid construction, no distortion
Bearings
Heavy-duty journal type
Long service life
Seals
Genuine Hitachi high-pressure seals
Leak-free operation
Drive Shaft
Induction-hardened alloy steel
Reliable power transmission
Key Features
- Fixed displacement design for consistent pilot pressure
- Compact size for tandem mounting with main pumps
- Smooth, pulse-free flow for precise control response
- Optimized for ZX210W-3 hydraulic system specifications
- Factory-tested for flow and pressure performance
Function & Operation
The gear pump (4649265) serves a critical role in the Hitachi ZX210W-3 hydraulic system:
Function
Description
Pilot Pressure Supply
Provides stable oil flow at 3.9 MPa to operate pilot control valves
Control Signal Generation
Enables precise operator commands to main control valve
System Efficiency
Allows main pumps to focus on work functions without parasitic losses
System Context
The ZX210W-3 utilizes the advanced HIOS III hydraulic system . The gear pump supplies pilot pressure that:
- Activates main control valve spools proportionally to lever movement
- Provides smooth, predictable machine response
- Enables fine control for precise grading and positioning
Compatible Hitachi Models
Series
Models
Primary
Hitachi ZX210W-3 Wheeled Excavator
Check Compatibility
ZX190W-3, ZX220W-3
IMPORTANT: Please verify your machine's serial number with our parts department to ensure correct compatibility, as pump configurations may vary by production date and regional specifications.
Common Failure Signs
Symptom
Likely Cause
Slow or sluggish control response
Reduced pilot flow, pump wear
Erratic machine movements
Fluctuating pilot pressure
External oil leaks
Shaft seal or housing seal failure
Unusual noise (whining)
Cavitation, bearing wear, aeration
High pilot circuit pressure drop
Internal wear, bypassing
Genuine Part Assurance
Assurance
Detail
Authenticity
100% genuine Hitachi part
Packaging
Original Hitachi packaging with security seals
Warranty
Full Hitachi manufacturer's warranty
Documentation
Genuine parts certificate
Traceability
Complete manufacturing records available
Installation Guidelines
Critical Requirements
- Verify part numbermatches your machine's requirements
- Ensure absolute cleanliness- Contamination causes gear pump failure
- Inspect main pump mounting- Gear pump often mounts in tandem
- Replace all sealsduring installation
- Have new genuine Hitachi filters and oilready
Installation Steps (Overview)
- Relieve system pressure completely
- Clean pump area thoroughly before disconnection
- Label and disconnect pilot lines
- Remove old gear pump from tandem mounting
- Clean mounting surface and all port openings
- Inspect drive coupling for wear
- Install new genuine Hitachi gear pump (4649265)
- Connect all lines using new seals
- Torque all connections to Hitachi specifications
- Prime pump before starting
- Start engine, check for leaks and proper pilot pressure
Post-Installation
- Verify pilot pressure is stable at 3.9 MPa
- Check all control functions for smooth response
- Inspect for external leaks after first hours of operation
IMPORTANT: Installation should only be performed by qualified technicians familiar with Hitachi hydraulic systems.
Maintenance Recommendations
Interval
Maintenance Task
Daily
Check for external leaks, unusual noise
Weekly
Verify smooth control response
Every 500 hours
Check hydraulic oil cleanliness
Every 2000 hours
Change hydraulic oil and all filters
Critical Maintenance Notes
- Always use genuine Hitachi hydraulic oil (ISO 46 recommended)
- Maintain strict cleanliness - gear pumps are precision components
- Address any pilot control issues immediately
- Keep hydraulic oil clean to prevent premature pump wear
Ordering Information
Part Number: 4649265
Product Name: Gear Pump (Pilot Pump) - Genuine Hitachi
Application: Hitachi ZX210W-3 Wheeled Excavator
Condition: New Genuine OEM Part
Packaging: Original Hitachi industrial packaging
Technical Support
Our parts specialists can assist with:
- Compatibility verification using your machine serial number
- Installation guidance and best practices
- Pilot pressure setting specifications
- Troubleshooting existing pilot system issues
Please have your machine serial number ready when contacting us.
Hitachi is a registered trademark of Hitachi Construction Machinery. All genuine parts are sourced through authorized distribution channels.
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