One issue we have with this vehicle is that it has two hydraulic motor mounts which are recurring problem with the Touring model and its engine economy mode. (autolist.com)
I came across this word on a particular type of hydraulic motor, but I do not understand what is so «orbital» about orbital motor. (mechanics.stackexchange.com)
Instead, the engine was connected to two hydraulic pumps (one for each side) that used pipes to drive individual hydraulic motors in each wheel. (en.m.wikipedia.org)