PV300 John Deere 450 550 series track adjuster. Complete track adjuster assembly for the following John Deere models: 450 Loader, 450, 450B, 450C, 450D, 450E, 550, 550B, dozer, all with 5 roller track frames. These adjusters are manufactured here in the USA and are made from high strength steel and are precision welded. These replacement track adjusters are an exact fit and require no modifications.
Note: Machines with 6 roller track frames such as the 450E, 550 & 550B Long Track require the PV305.