Do (did) you mean the difficulties experienced in collecting pumps to populate the Equipment Library in the first instance ... or a day-to-day reluctance by the wards to surrender pumps borrowed from the Library?
In either case, the issue is best solved through "interpersonal skills", I would have thought. Let's face it, some folk are good at that sort of thing, whilst others are better off, shall we say, shuffling about at the back of the workshop!

If the staff are hiding pumps, surely this can only be an indication that (for some reason or another) they are unhappy with the service afforded them by the Equipment Library. Why not have a chat with them and find out what the real problem is?
Not enough pumps. Never one available when they need one. Stuff like that, I should imagine. Then address the problems squarely once they have become clear.