I bought an old Bunton (cheap and too see if I want one for the long haul) ZTR. It is a model BBMH20. For the life of me I can not find a drain for the hydraulic system. Do I just remove a hose? Do you then have to bleed air out? I don't have an owners manual, yet, but would like to get all the fluids changed. Here are some pics, maybe it matches up with another manufacturers system. Pump Wheel Motor Reservoir Any help would be greatly appreciated. Any time I buy something "new" I like to get the fluids changed ASAP.