[bestgenman]

I'll add my two cents worth here since several friends have had the same experience.  If you have a CAT (& I think you do), the hydraulic pump has stopped making pressure and the problem is with the spline (female portion) the pump inserts into which is a CAT part.  They do not hold up well and the splines give out.   The fix is a new CAT part.   On the 07's the turbo studs would back out.  so, if you make it to a CAT repair facility, it might be worth looking into the studs.