INTRODUCTION Undercarriage is the most expensive element among several elements of repair and maintenance (hereafter R&M) cost to run a large size bulldozer. And among undercarriage parts such as track , top(carrier) rollers, bottom(track) rollers, idlers, sprocket segments, roller guards and so on, track parts spend major portion of entire undercarriage cost such as 50% or more of the total cost. In order to manage R&M cost in reasonable one, WET TURN OF TRACK BUSHING is the most important issue for large size bulldozer and reduces number of tracks to be replaced with a new one as an example shown in below.
Bulldozer R&M cost Undercarriage R&M cost Other Undercarriage Track Other Track R&M cost No turn Bushing turn In 2001, a new D475A is launched with a new undercarriage system, which is explained in details on the next pages. Wedge rings fitted on both ends of pin assure holding pins and links in proper position even pins are fitted with less force to prevent scuffing. K-bogies prevent from link shoulder chipping by better following-up capability and new guards do not cause inclined wear on pin ends any more. A new F5 seal is adopted and it extends seal life as well.
All these innovations enable WET TURN OF TRACK BUSHING more easily and this manual is issued to introduce the new undercarriage and its WET TURN OF TRACK BUSHING procedure correctly and practically. It would be more effctive if this manual is utilized with separate volume of " Guidance for Reusable Parts - Lubricated Track (II)" Form No. SEBG4091" . We thank very much for all persons of NSK(Australia) who gave us great cooperation on the occasion of taking pictures of actual jobs there for the draft creation. Note: This publication is intended for guidance only and KOMATSU LTD.
hereby expressly denies and excludes any representation, warranty or implied warranty for the reuse of sealed and lubricated track - 1 - Other Other Bushing turn Track2 Track1 Track3 Other Bushing turn Track2 Track2 Track1 Track1