907002 Seal Kit Fits Case 450C Long Track, 550 to s/n JAK0013968One New Aftermarket Replacement Track Adjuster Seal Kit for Case Crawler Dozer Models This aftermarket replacement track adjuster seal kit (Case part number 907002) is designed to rebuild the hydraulic track adjuster cylinder on Case crawler dozers. Important fitment note: This kit fits the Case 450C Long Track and Case 550 up to serial number JAK0013968. The kit contains all necessary seals and a retainer ring to rebuild one track adjuster assembly.