Dyson DC07 hose not picking up?

I have a Dyson DCO7 that was in the shop and came back with great suction. Then I notced the hose was starting to break, so I replace it. Now with a new hose I still can not get good suction. I have taken the hose off, the u tube(i think that is what you call it) and still nothing. I have good suction all the way until I install the hose. Any suggestions would be appreciated