CEwriter
Senior Member
The Parallel Link Undercarriage System (PLUS) has been in the US less than two years. It's Komatsu's first roller-bushing undercarriage, which they say is suitable for high-impact and high-abrasion applications and can as much as double conventional undercarriage life. They made it standard equipment on the D51EX/PX-22, D61EX/PX-15 and D65EX/PX/WX-15 crawler dozers.
More here
More here