I replaced my JD 1760 planter with a $700 John Deere planter. It failed the following year, but JD didn't guarantee it since it was a year old, so I replaced it with a Viair 450c (identical to John Deere). The new Viair unit didn't seem to pump air from the get-go. I tried contacting the manufacturer for help but never got a reply so every time I filled the planter last year I had to refill the planter. I think I'll try again in spring but I'm not very optimistic.