are talking the hesston built straight through or the dion built straight through?
Those were one in the same. They replaced the 7170, I think was the model number of the last Hesston/Case forage harvesters. When case and new holland merged the partnership between case and agco for hay tools was dissolved. I don't know if sales volumes of pull type forage harvesters were to low for hesston to keep making their machine, or if they found it cheaper to out source production to Dion. The design of the Hesston 7500 and what ever Dion called it at the time was a good design, for small farms, with lower horse power tractors, who weren't putting up thousands of tons of feed per year. The bigger feedlots and dairies around here that had them wore them out the first year. All the liners in the spout, blower paddles, some of the feed rolls, and most critically the main gear box's were failing. They couldn't handle the power. The previous machines could handle power, but were limited by what they could feed into them. The 7500 had the capacity, but couldn't handle guys hooking up 500 hp 4 wd tractors to them. The gear box's heated up, and the gears failed, lost teeth on the gears, and in some cases, put a hole in the gear case its self. They did come up with a change up after the first couple of years, helical gears instead of straight cut. This was a fix as fail deal. If it didn't fail under warranty, you didn't get it fixed for free. While these changes made a huge difference, I think the damage to the brand was done, they weren't a long lasting model.
If you didn't put to much power to them they would last, until just after warranty, then fail. Thats what happened to us. Ran it a couple of year after we had it fixed and traded it on a new holland fp 240. Good machine. In this area, most of the hesston 7500's were traded on self propelled units, and they were worth slightly more than scrap metal price. I think the Claas forage harvester dealer in Eckville had 4-6 7500's on their lot for several years, before they ended up either as scrap, or sold at auction. The new Dion is the same design. The dealer told me that they have upgraded the drives, liners, and other wear points. But it just brings back a lot of bad memories.