Something my dealer never told me when talking me into a Hydrostatic (1740M), the engine has to be run at ~2500 RPM to make the Shibaru engine burn the particulate correctly. If I don't, the engine starts chugging and coughing black smoke. I hate high RPMs as it makes everything super sensitive - raising the loader makes the tractor jump, raising the three point makes the tractor jump. Do you have to operate the shuttle shift tractor at high RPM for the same reason? I assume so if it has a no particulate engine.
Never heard of such a thing. We have sold numerous Shibaura Engines in 2700E & now 1700M and never heard or have had this and know our customers are not operating at full throttle. I would recommend getting your tractor in to your dealer so they can check. Something does not sound right especially if black smoke is improper fuel/air mixture. They can connect to AGCO EDT Electronic Diagnostics Tool and watch the engine. The Operators Manual recommends minimum of 1500 RPM with hydrostat for Maximum Response Control of the Hydrostat Transmission page 88 in Operators Manual. I'd recommend getting your tractor checked out by your selling dealer.
True, page 88 states "keep the engine speed above 1500 rpm when operating the hydrostatic control pedal." but this is referring to the pedal, not the transmission. Section 3.8.1 on page 87 states "The hydrostatic transmission works best when the engine is operating at or above 2400 rpm." 1500 rpm is a minimum for proper pedal response and also for warming a cold engine/hydraulic system according to paragraph 13 at the bottom pf page 79. So per the owners manual, there's nothing wrong with the tractor, it's just my dislike for the operational requirement of hydrostatic transmissions. Being new to hydrostatic transmissions, I guess it will just take some getting used to. I love everything else about the 1740M but I do think the DL-125 loader package when paired with a hydrostatic transmission should automatically include SoftDrive since having to run the engine at such high rpm's makes loader operation touchy. Thank you for your reply and thank you for the extremely well done and helpful videos. Vahrenberg Implement has been more informative to me than anyone including my dealer who has never even heard of SoftDrive.