HST has been around for a while now, even on the compact tractors since around 1990... so the 10-year old models with thousands of hours are in fact out there. Overall reliability problems with HST would be heard loud and clear... the fact is the companies who developed these transmissions put a lot into the development...
As for the larger tractors, we're starting to see them bigger and bigger with the HST. The latest bad boy with HST is the L48 TLB/monster. A ton of weight (7760lbs, to be exact /w3tcompact/icons/wink.gif) and an intended use that promises to be rough on the tractor and transmission... the development of HST has come a long way for sure. It wouldn't surprise me to see 50+ HP tractors with HST in the future. If you're thinking about long (LONG) term reliability (like, 50 years) ... who knows! /w3tcompact/icons/smile.gif Very few owners of tractors in the HP range that have HST options will keep them 50 years anyway... I would compare it to the automatic/manual transmission reliability comparison in cars, although tractor transmissions are probably much more reliable overall.
As for the larger tractors, we're starting to see them bigger and bigger with the HST. The latest bad boy with HST is the L48 TLB/monster. A ton of weight (7760lbs, to be exact /w3tcompact/icons/wink.gif) and an intended use that promises to be rough on the tractor and transmission... the development of HST has come a long way for sure. It wouldn't surprise me to see 50+ HP tractors with HST in the future. If you're thinking about long (LONG) term reliability (like, 50 years) ... who knows! /w3tcompact/icons/smile.gif Very few owners of tractors in the HP range that have HST options will keep them 50 years anyway... I would compare it to the automatic/manual transmission reliability comparison in cars, although tractor transmissions are probably much more reliable overall.
