AT159554 check valve Fits John Deere 700H LT, 700J LTOne New Aftermarket Replacement Check Valve Fits John Deere Crawler Dozers This aftermarket replacement check valve fits the track adjuster assembly on Fits John Deere crawler dozers. The valve screws into the track adjuster and controls grease flow to the track tensioner, keeping proper track tension. Over time these valves can fail to seat properly, requiring replacement to maintain correct track tension and prevent grease loss. Compatible Models