There was a tool bobcat used to depress the two pressure relief valves located on the left from the front side of the hydrostatic unit under the cab. They are next to each other and when pulled out and the valve removed if you use a 1\8th inch rod you can depress the poppet valve. I made two tools that just screw into the holes and you then can roll the bobcat as you need. Problem is the caps (2) are really stuck after 30 years. I had to use a induction bolt heater, if you do not have one of these you need one. I have them in place in a 743 I just purchased that the engine was removed and with a spare he was planning to replace it with. When I remove them I will take pictures and show dimensions as well. I plan to make them and offer them for sale. This is how bobcat dealers rolled them when needed. I have 4 743's and one 843 I am planning to fix for resale. They are all the same, but I do not know how late and how newer models they will fit. I am in need of two oil pans that will fit V1702 that are the cast type the front motor mount bolts to. I have several stamped out steel ones but need the cast ones and preferably with the bolts. I also have the rear motor mounts to swap a refer direct injection engine V2203. The rear mount is different $300 plus shipping. Nice water jet cut. Or $200 trade for the v1702 mount.