I just purchased a 311bhs and I looked all over for mine this weekend. It would be nice if the book said where to find the unit. I located mine under the front of the trailer. I was looking at the electronic jacks and looked up under the trailer and saw the slide out pump/gear box, what ever it is up under the front sitting on the frame. The fluids looked half full so I left it for another day. Try checking there.
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2009 Sprinter 311BHS
Patrick and Brenda
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