At first I thought it was odd that people here were being told to run their tractors most of the time at full rpm's when doing work. To me, a diesel is a low rpm torquer. Then it occurred to me that most of the tractors in discussion here are small NON-TURBO engines. That's it, I'm used to all diesels being turbo charged: pick ups, tractor trailers, construction equip. And I noticed on this forum and youtube videos that the hydraulic transmissions will get too hot if you work them hard at low rpm's with low volume flow of the hydro tranny fluid, that higher flow rate allows better cooling of the fluid while operating. Somebody (I think in a video by Tractor Mike) said its better to be in a lower gear (range) and higher rpm's than a higher range and low rpm's while working the tractor hard. Makes sense now, knowing that the hydro fluid and tranny can overheat and in time and kill it or wear it out prematurely.