Fallon
Super Member
A HST is just a hydraulic pump directly connected to a hydraulic motor. Variable displacement pump so it can almost go instantly from 0 flow to full flow or anywhere in between. At 0 flow, the motors don't move, so they hold you at a stop. In practice they leak down a bit so depending on the gear the machine will creep a little bit.where is torque multiplied in an hst. is there torque converter?
Tractors have a clunky 3 speed transmission on them. Not actually sure if it's before or after the HST. Need to come to a complete stop to shift that tranny. No keep to stop to change speed within those 3 ranges. Some cheap machines out there only have a 2 speed tranny. Know a few machines like some mini TBLs that only have a 1 speed HST. I guess excavators & many skid steeres fall in that bucket as .