HITACHI CONSTRUCTION MACHINERY

Hitachi's technology is built on a wealth of experience and know-how from limestone sites and quarries around the world. The undercarriage of the ZAXIS 250 has become much stronger. Improved construction and enlarged box sections, a track undercover plate that protects the center joint and hydraulic hoses make this machine more durable.

Strengthened undercarriage
The X-beam is strengthened by the improved construction and enlarged box sections. The section is increased in strength up to 45%. Top and bottom plates of the X-beam use monolithic plates, instead of conventional welded four plates. This eliminates welding to strengthen the X-beam. Upper and lower rollers and upper roller brackets are increased in size for higher durability. Track links are thickened and reshaped for higher durability and rigidity.

Improved idler brackets
The idler bracket reinforcing plate is thickened greatly for higher durability to prevent the opening of idler bracket. The rack link disengagement preventive plate, located just behind the idler bracket, is thickened for higher durability, and reshaped by extending its stepped end to prevent the disengagement of track links.

Strengthened front attachment
Using high-tensile steel strengthens the boom top bracket. At arm-bucket joint, the arm top is hardened with Tungsten-Carbide thermal spraying for greater wear resistance at its contact surface with bucket, reducing jerking. Reinforced resin thrust plates designed to reduce noise and resist wear. The new HN bushings, containing HITASOL (solid molybdenum-based lubricant), are utilized at the boom-arm joint and arm cylinder mounting area for better lubrication and higher durability. (At other joints, conventional HN bushings are also utilized.) The boom foot is enlarged for higher strength. This improvement increases the durability and reliability under heavy-duty operation.

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