Fits John Deere Crawler dozer track adjuster VALVE AT159554 450 450b 450c 550 55

One New Aftermarket Replacement Track Adjuster Check Valve Fits John Deere (Fits JD) Crawler Dozers and Loaders

This aftermarket replacement check valve screws into the track adjuster assembly and controls grease flow into the track tensioner on Fits John Deere (Fits JD) crawler dozers and loaders. Over time, the internal seat on these valves wears and no longer seals properly, preventing grease from reaching the tensioner — replacement restores correct track tension adjustment. The valve accepts a standard grease fitting at the inlet for easy service access.

Compatible Models

Fits John Deere Crawler Dozers: 450, 450B, 450C, 450D, 550, 550A, 555, 555A, 700H, 700J, 700J-II, 700K, 750C, 850C

Fits John Deere Crawler Dozers (G-Series): 450G, 455G, 550G, 555G, 650G

Replaces Part Number(s):

AT159554, AT159554-A, UNU20-0021

New aftermarket replacement part – not remanufactured, not used.