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OK, Sir, welcome to the world of DB hydraulics. If you do a search on David Brown hydraulics on this web site, you will find several hundred messages that will tell you all you need to know. I strongly recommend you get a shop manual, which is available from several sources. Check out the David Brown Tractor Club in the UK as well. You will find many hits if you Google it. As to some of the questions you ask: The depth/height/TCU control behind the raise/lower control for the hydraulics controls the mode of the hydraulic system. Leave it in "height", middle position, until you need to change it. The umbrella shaped lever that moves vertically upwards is, believe it or not, the parking brake. It's often seized and needs freeing up. You pull it up and turn it to the right to lock it. If you get off the tractor and look at it, you will see the operating rod is connected to the brake pedals under the footrest. Or it should be - when I got my DB the thing wasn't hooked up! And the rotary knob in the same area controls the raise/lower rate of the hydraulics. When you change the transmission and hydraulic fliud, change the filter as well. The filter is in a big metal enclosure right underneath the tractor, behind the back wheels. Sounds like your baby has been a bit harshly treated. I'd recommend you change the engine oil and filter, fuel filters and the coolant/anitfreeze before using it for any serious work. Good luck..... .
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