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| Item | Specification |
|---|---|
| Part Number | 4729804 |
| Product Name | Track Link Assembly / Track Chain Group |
| Product Type | Undercarriage Component (Crawler Track System) |
| Compatible Machine Models | Hitachi EX1200-6, EX1200-7 (Large Hydraulic Mining Excavator) |
| Track Chain Type | Heavy Duty Sealed & Lubricated Track (SALT) |
| Number of Links | 49 Links per assembly |
| Total Assembly Weight | 2,552 kgs (5,626 lbs) |
| Pin & Bushing Type | Heat-treated, press-fit, sealed & lubricated |
| Material | Premium Alloy Steel (Boron/Manganese steel) |
| Heat Treatment | Induction hardened pin/bushing surfaces; Fully hardened link rails |
| Seal Type | Duo-Cone / Floating Seal (Prevents internal contamination) |
| Lubrication | Factory-filled grease (Extended service life, maintenance-free) |
| Track Pitch | 317 mm (12.5 in) *[Standard assumption for EX1200-class] |
| Industry Focus | Surface Mining, Heavy Overburden Removal, Quarrying |
| Compatibility | Direct OEM replacement for Hitachi 4638435, 4638436 series |
Hitachi EX1200-6 track chain assembly
4729804 undercarriage parts
EX1200-7 track link group
49 link sealed lubricated track for Hitachi
Heavy duty mining excavator track chain
EX1200 track assembly 2552 kg
Replacement track links for Hitachi EX1200 series
The Hitachi Track Link Assembly (Part No. 4729804) is a complete, ready-to-install undercarriage component designed specifically for the EX1200-6 and EX1200-7 large hydraulic mining excavators.
| Feature | Benefit |
|---|---|
| Sealed & Lubricated Track (SALT) Design | Internal grease lubrication and floating seals keep dirt and water out, drastically reducing internal pin/bushing wear. |
| 49-Link Configuration | Specifically engineered for the heavy demands of 120-ton class excavators, ensuring proper fitment and track tension. |
| Induction Hardened Components | Links, pins, and bushings are surface-hardened (HRC 52-62) to withstand high impact and abrasive wear. |
| Press-Fit Assembly | Pre-assembled at the factory under hydraulic pressure, ensuring consistent torque and alignment, eliminating field assembly errors. |
| Boron Alloy Steel Construction | Provides superior toughness to resist bending and breaking under extreme digging and dozing loads. |
Hard rock surface mining
Heavy overburden removal
Large-scale quarry operations
Heavy construction & earthmoving
Proper Tension: Ensure correct track sag (2-3% of center distance) to avoid excessive wear on the sprocket and idler.
Compatibility: 100% compatible with Hitachi OEM sprockets (e.g., 4661591), carrier rollers (4638433), and track shoes.
Lifting: Due to the heavy weight (2.5+ metric tons), use certified lifting slings and heavy-capacity forklifts or overhead cranes during installation.
Extended Service Life: The sealed & lubricated design significantly outlasts dry track chains in abrasive mining environments.
Cost Efficient: Reduces downtime by minimizing internal pin/bushing wear, lowering long-term operating costs.
OEM Interchangeability: Manufactured to exact Hitachi specifications for a perfect bolt-on fit without any modification.
| Specification | Value |
|---|---|
| Pitch (center-to-center pin distance) | 317 mm (12.5 in) |
| Link height (rail height) | Standard heavy duty profile |
| Bushing outer diameter | Oversized for mining loads |
| Pin diameter | Heat-treated alloy steel |
| Weight per link (approx.) | 52 kg (including pin/bushing) |
Note: To ensure 100% compatibility, please verify your machine’s serial number (SN: 2001 to 2100 range for EX1200-6; 2101+ for EX1200-7) and current track pitch before ordering. If you need the matching track shoe group or sprocket, please request part numbers 4661591 or custom shoe options.
