Dont know if D-17 and WD-45 are the same at the Controls for the lift and the Traction Booster. But I know that when I first got my D-17 in Feb of 12 I used the lift a couple of times then it would not go down. Realized I had moved the traction booster leaver (Short one closer to the Steering Wheel) all the way up or down and that prevented the lift from going down. Once I moved it the other way the lift lowered. I tried to repeat it and I could, making me realize that this controls the lowering of the lift also. Maybe you could try this before you take apart the hydraulics. good luck
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