What you are decribing is a worn out clutch. If you have adjusted it according to the book and it still does the same thing, your clutch is shot. I put one in my H this past summer and it took less then 4 hours to do the job. My hyd. pump was already out and I did not put it back in right away. It is no big deal to put one in. If you look up in the housing it will be plain as day as to what you need to do. Also look in some of the past post on replacing clutches and you should do just fine.