Welcome,
I just got my 2005 A300 back in January.
Just a heads up that you should post any questions on the appropriate forum, not the introduce yourself. A lot of people skip over those.
I'll assume that your tilt was working fine before the hose replacement.
Most likely you got hoses connected wrong. Very easy to do since the hoses connect next to each other. if this is what you did, you may hear the relief valve open if the two cylinders are fighting one another or the fluid may be just circulating before it gets to the cylinders.
You can look up your machine by the serial number at bobcatpartsonline.com and look at the exploded view of your hydraulics to check your connections.