8-n hyd problems

While trying to "spike" a hay bale from the side and not being successful the first time, I thought that if I would get a running start (in reverse) that the hay spear would then penetrate the tough bale. Well aside from a good jolt nothing happened. Seconds later the hyd. lift stopped working. I peeked into the reservoir through the dipstick cover/plate and saw some terbulence in the oil. I replaced the oil and still no luck. I then replaced the pump and this time no terbulence and no response. The pump was taken from a 8-n parts piece of tractor that I bought specifically because the man that sold it to me had told me that the hyd. system on it was in excellent shape. Somebody else told me to check the "dogbone" in it. What does that mean?

Thanks for any thoughts on this subject.

Now then, when abused, the dogbone has been known to put a hole right thru the top of the hydraulic piston. And guess what?....with a hole in the hydraulic piston, the darn thing don't work. Wonder why?

Respectfully..... ...Dell

Thanks for responding.

Lops(tx)