how to remove hose from shower pump ?

I have an Aqualiser Type 3 TE shower pump that I found the plumber (several years ago) fitted the wrong way round (hot to cold etc). I need to swap it over, but when I try to remove the hoses from the pump, they come an inch or two off but then there is something like a spring that stops me taking them right off. Can anyone tell me how I remove them please?