Track Chain Assembly for Hitachi EX1200-6 Excavator | YA00057804
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Hitachi EX1200-6 Excavator YA00057804
Track Chain Assembly for Hitachi EX1200-6 Excavator | YA00057804
Product Overview
The track chain assembly (also known as track link assembly) is a critical undercarriage component of your Hitachi EX1200-6 mining excavator. This precision-engineered assembly consists of interconnected track links, bushings, and pins that form the continuous loop around the undercarriage. The track chain engages with the drive sprocket, travels around the idler and rollers, and supports the 112-ton machine while providing traction in demanding mining environments .
The Hitachi EX1200-6 is a 112-ton class mining excavator manufactured from 2007 to 2012, powered by a Cummins QSK23 engine producing 567 kW (760 HP) . This genuine Hitachi track chain assembly (Part No. YA00057804) is engineered to exacting OEM specifications for perfect fit, reliable performance, and maximum service life in demanding mining environments.
This is a genuine Hitachi original equipment part.
Technical Specifications
Parameter
Specification
Part Number
YA00057804
Manufacturer
Hitachi Construction Machinery
Component Type
Track chain assembly / Track link assembly
Application
Undercarriage track system
Machine Model
EX1200-6 Mining Excavator
Operating Weight
112 t (112,000 kg)
Engine Power
567 kW (760 HP)
Engine Model
Cummins QSK23
Track Width
710 mm
Track Type
Sealed and lubricated track
Link Material
Forged heat-treated alloy steel (35MnB/40Mn2)
Surface Hardness
HRC53-58
Bushing Type
Deep induction-hardened, sealed
Pin Type
Precision-ground, heat-treated
Seal Type
Duo-Cone floating seal system
Master Link Type
Offset / Bolt-on (verify configuration)
Please verify exact specifications with your machine's technical manual or existing component.
EX1200-6 Undercarriage Overview
The Hitachi EX1200-6 features a reinforced undercarriage system designed for extreme mining conditions. This mining-class excavator works under extreme loading forces, abrasive ground materials, and nonstop operational cycles .
Component
Function
Track Chain Assembly (YA00057804)
Continuous chain with pins and bushings
Track Shoes
Individual pads bolted to links for ground contact
Drive Sprocket
Engages bushings to propel machine
Track Idler
Maintains track tension at front
Track Rollers (Lower)
Support machine weight on track frame
Carrier Rollers (Upper)
Support upper track run
Track Adjuster Cylinder
Hydraulic cylinder for tensioning
Key Undercarriage Features
- 710 mm track width provides excellent flotation and stability
- HD (Heavy Duty) undercarriage designed for mining applications
- Sealed and lubricated track design extends component life
Track Chain Components
The track chain assembly (YA00057804) integrates several critical components :
Component
Description
Track Links
Forged from high-tensile alloy steel (35MnB/40Mn2), heat-treated for exceptional resistance to cracking and stable mechanical strength under massive compression. Forging eliminates internal voids and improves grain uniformity .
Track Bushings
Deep induction-hardened outer and inner surfaces. The hardening process enhances resistance against metal-to-metal friction and abrasive penetration from fine minerals .
Track Pins
High-strength steel, precision-ground, heat-treated, inserted between links to create a flexible, load-bearing chain .
Master Link
Removable link for track assembly/disassembly. Typically offset design for easier field service.
Seals
Sealing system prevents grease leakage and contaminant ingress .
Track Shoes
Individual pads bolted to each link for ground contact (order separately).
Function & Operation
Function
Description
Weight Distribution
Transfers machine weight to track shoes and ground via rollers
Propulsion
Pin and bushing engagement with drive sprocket transfers torque to ground
Articulation
Links pivot at pin and bushing joints, allowing track to wrap around sprocket and idler
Shock Absorption
Absorbs impact loads during travel over obstacles
Operating Principle
- Drive sprocket engages track bushings
- Sprocket rotation pulls track chain around undercarriage
- Track links articulate at pin and bushing joints
- Track chain transfers motion to track shoes
- Shoes contact ground, propelling the 112-ton machine
- Idler and adjuster maintain proper track tension
Wear Mechanism
As the track chain operates, the following progressive wear occurs :
- Pin and bushing outer surfaces wear from sprocket engagement
- Pin and bushing internal surfaces wear from articulation
- Track chain "stretches" as pin/bushing clearances increase
- Seal failure leads to contamination ingress, accelerating wear
- Proper lubrication and tension management extend service life
Compatible Hitachi Models
Series
Models
Primary
Hitachi EX1200-6 Mining Excavator
Also Compatible
EX1200, EX1200-5, EX1200-7
Important:Please verify your machine's serial number with our parts department to ensure correct compatibility. The EX1200-6 was manufactured from 2007 to 2012 with serial numbers requiring verification .
Genuine Hitachi Quality
Component
Feature
Benefit
Track Links
Forged high-tensile alloy steel (35MnB/40Mn2)
Exceptional resistance to cracking, stable mechanical strength under massive compression
Bushings
Deep induction-hardened surfaces (HRC53-58)
Extended wear life, stronger resistance to internal wear
Pins
Precision-ground, heat-treated
Smooth articulation, long service life
Seals
Duo-Cone floating seal system
Superior contamination protection, retains lubrication
Master Link
Offset design for easy assembly
Simplified field installation
Surface Protection
Industrial-grade coating
Protects against rust, humidity, and chemical corrosion
Key Features
- Sealed and lubricated track design for extended life in abrasive mining environments
- Deep induction-hardened bushings for maximum wear resistance
- Precision-forged links with uniform grain structure
- Reinforced link profile for heavy impact and rock abrasion resistance
- OEM-standard pitch for perfect compatibility with EX1200-6 undercarriage components
- Tested under toughest mining conditions
- Direct replacement for original equipment
Common Failure Signs
Symptom
Likely Cause
Track noise (squeaking, popping)
Worn pins and bushings, lack of lubrication, seal failure
Excessive track sag
Pin and bushing wear, track chain stretch
Track derailment
Worn components, improper tension, flange wear
Sprocket jump (track skipping)
Worn bushings, improper sprocket engagement
Uneven link wear
Misalignment, worn rollers
Track chain measurement exceeds limit
Pin and bushing wear beyond service limit
Master link failure
Fatigue, improper installation
Seal leakage
Duo-Cone seal damage, contamination ingress
Genuine Part Assurance
Assurance
Detail
Authenticity
100% genuine Hitachi part
Condition
New
Warranty
Full Hitachi manufacturer's warranty
Packaging
Original Hitachi heavy-equipment industrial packaging
Origin
Japan
Note:Hitachi Genuine Parts are manufactured using high-quality materials and tested under the toughest conditions to guarantee reliable performance.
Installation Guidelines
Critical Requirements
- Verify part number matches your machine's requirements
- Prepare adequate heavy lifting equipment - Track chain is extremely heavy
- Support machine securely with proper blocking
- Relieve track tension before removal using track adjuster grease valve
- Use proper track tools for master link and chain handling
- Reference EX1200-6 Workshop Manual for complete procedures
Installation Steps
- Position machine on level ground, block securely
- Relieve track tension using track adjuster grease valve
- Remove track shoes from old chain (if reusing shoes)
- Remove master link bolts and separate master link
- Remove old track chain assembly
- Clean sprocket, rollers, and idler surfaces thoroughly
- Inspect undercarriage components for wear
- Position new track chain assembly (YA00057804) around undercarriage
- Align master link and install connecting pins
- Install master link bolts and torque to Hitachi specifications
- Install track shoes with new bolts (if not pre-assembled)
- Apply track tension to specification using track adjuster
- Test track operation in forward and reverse at low speed
- Re-torque master link bolts after initial operation
- Re-check and adjust track tension after test operation
Post-Installation
- Verify smooth track operation in both directions
- Check for proper sprocket engagement with bushings
- Inspect for unusual noise during travel
- Monitor track tension during initial operation
- Re-tension after break-in period (typically 50 hours)
Replacement Strategy
Due to the interdependent nature of undercarriage components, it is standard and highly recommended practice to replace the track chain together with the drive sprocket as a matched set. Worn sprockets will rapidly accelerate wear on a new track chain, and vice versa.
IMPORTANT:Installation must only be performed by qualified mining equipment technicians following procedures in the EX1200-6 Workshop Manual.
Maintenance Recommendations
Interval
Maintenance Task
Daily
Visual inspection for damage, check track tension, listen for unusual noise
Weekly
Check for loose track shoe bolts, inspect for seal leakage
Monthly
Measure track sag, adjust tension as needed
Every 500 hours
Measure pin and bushing wear
Every 1000 hours
Perform detailed undercarriage inspection
Every 2000 hours
Complete track chain wear measurement, sprocket inspection
As Needed
Replace when wear limits are reached
Track Tension Management
Maintaining proper track tension is critical for pin, bushing, and sprocket life:
- Overtightening increases rolling resistance and load on pins/bushings
- Undertightening causes track whipping and uneven wear
- Refer to EX1200-6 Operator's Manual for specific track sag specifications
Critical Notes
- Always use genuine Hitachi replacement parts
- Undercarriage wear is a major maintenance cost on 112-ton excavators
- Regular pin and bushing measurement extends track life
- Worn tracks accelerate sprocket, roller, and idler wear significantly
- Replace undercarriage components in sets for even wear distribution
- Seal integrity directly dictates the service life of the track chain
Ordering Information
Part Number:YA00057804
Product Name:Track Chain Assembly / Track Link Assembly (Genuine Hitachi)
Application:Hitachi EX1200-6 Mining Excavator
Also Fits:EX1200, EX1200-5, EX1200-7
Condition:New Genuine OEM Part
Recommended Related Parts
Component
Part Number
Notes
Track Shoe
Contact parts department
Order separately
Drive Sprocket
Contact parts department
Replace as matched set
Track Roller (Lower)
Contact parts department
Inspect during track replacement
Carrier Roller (Upper)
Contact parts department
Inspect during track replacement
Track Idler
Contact parts department
Inspect during track replacement
Track Adjuster Seal Kit
Contact parts department
If adjuster service needed
Quantity per Machine
The Hitachi EX1200-6 is equipped with 2 track chain assemblies (1 per side).
Track Shoe Options
Track chain assemblies can be supplied with or without track shoes. Track shoe configurations include:
- Double grouser (standard for mining)
- Single grouser (for less aggressive terrain)
- Rubber pads (for roading applications)
Please specify your track shoe requirements when ordering.
Service Manual Reference
The EX1200-6 track chain and undercarriage system are documented in the following factory service publications:
Document
Reference
Content
Workshop Manual
EX1200-6 Workshop Manual
SECTION 3 UNDERCARRIAGE - Track
Technical Manual (Operational Principle)
EX1200-6 Technical Manual
Component operation theory
Technical Manual (Troubleshooting)
EX1200-6 Technical Manual
Diagnostic procedures
For complete service information including torque specifications and wear limits, refer to the official Hitachi EX1200-6 Workshop Manual.
Product Source Information
The track chain assembly YA00057804 is available through authorized Hitachi parts distribution channels. For EX1200-6 undercarriage components, it is recommended to contact parts specialists with your machine serial number for accurate compatibility verification. The EX1200-6 was manufactured from 2007 to 2012, and serial number verification is important for ensuring correct fitment .
Hitachi EX1200-6 is a registered trademark of Hitachi Construction Machinery. All genuine parts are sourced through authorized distribution channels. Specifications and design subject to change without notice.
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Factory 05
Factory 04
Factory 03
Factory 02
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