HOTPOINT 1000 First Edition does not rinse and spin properly?

I had a problem where the belt had gone on this machine so replaced it.

It worked for a while (about 3 days!) without error, but then the spin stopped working properly: The machine was rinsing and spinning but would not empty the water. I have trie the outlet pipe for the old water at the back and it seems that when I lower the pipe (below the washer level) the waste comes out, but when I put in the pipe in the wall (which is higher thatn the outlet part at the bottom) the washer will not empty/................hope this makes sense to you as it does not really to me...

(maybe there is a pump which pushes the water out and through the outlet pipe i was thinkin?!?)

thanks

Dave