Here is a comprehensive guide regarding the Track Chain Assembly for Hitachi Excavators, including types, part numbers, and how to identify the correct one.

1. Core Components of the Assembly

A standard track chain assembly consists of:

• Links: The connected pieces that form the rail the rollers travel on.

• Pins and Bushings: The joints that allow the chain to articulate around the sprocket and idler.

• Seals: Grease-filled cartridges that keep dirt out and lubrication in (in sealed and lubricated models).

2. Types of Track Chains

Depending on the model and application, Hitachi excavators use different types of chains:

• Standard (Dry) Chain: Common on smaller mini-excavators. The pin and bushing have no internal lubrication.

• Sealed (Grease-Lubricated) Chain: The most common type for mid-size to large excavators. The space between the pin and bushing is filled with grease, greatly extending the life of the joint.

• Sealed and Lubricated (SALT): Similar to grease-lubricated but often with enhanced sealing to keep abrasives out.

3. Common Hitachi Excavator Models & Series

Hitachi produces several series. The track chain varies significantly between them:

• ZX Series (e.g., ZX130, ZX200, ZX210, ZX330, ZX470): Modern medium to large excavators.

• EX Series (e.g., EX60, EX100, EX200, EX300, EX400): Older models, often still in use globally.

• Dash Series (e.g., 120-5, 200-5, 250-5, 350-5, 450-5): The "Dash 5" and "Dash 6" series are popular mid-range models.