I got tired of how many times this jumped the track. I believe the gears are plastic, as well, it stopped progressing along the hose.  I never abused my tractor sprinkler, always putting it away (fearing theft).  I ultimately bought a national walking sprinkler and added the brass arms so i would be done replacing this expensive item for once and for all. [...]  That item is expensive and heavy but is all metal and does a great job.