We bought an early 4830 sprayer new in 07'. The hose they put on the sprayer wasn't chemical proof hose and we had several failures, one of them when we were filling and spraying with some pretty nasty stuff. John Deere's response was that it was Goodyear's fault as they had incorrectly told them the hose was ok for chemicals. I noticed that all the later models I saw had different hose on them. John Deere's response to all complaints real or imagined........."Thank you for your input, it will be corrected on the next model year. Please pay now for your parts."