An external pump & tank will give more speed (more oil volume being pumped) but not more digging force. Tractor internal hydraulics are set at about 2000 psi. A standard external system will be set about the same. That's not to say you couldn't bugger with it and raise the pressure a little - but there won't be a major difference. The safest way to get more digging force is with bigger cylinders (different backhoe). /forums/images/graemlins/frown.gif