Upper rollers and upper roller brackets are increased in size for higher durability.
Track links are thickened and reshaped for higher durability and rigidity.
Strengthened X beam and side frames
The X-beam is strengthened by the improved construction and enlarged box sections.
The section is increased in strength up to 35 % (maximum). 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.
Improved idler brackets
The idler bracket reinforcing plate is thickened greatly for higher durability to prevent the opening of the idler bracket. The track link disengagement preventive plate, located immediately behind the idle bracket, extends its top to prevent track link disengagement and increase durability.
Strengthened front attachment
The boom top bracket is strengthened by using high-tensile steel.
At arm-bucket joint, the arm top is hardened with WC thermal spraying (Tungsten-Carbide) 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 "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 reliable under heavy-duty operation.
New HN bushing
WC Thermal spraying
Reinforced resin thrust plates