My Whyte came with an X9 Type 2 rear mech - when I bought it I asked the shop to fit an XT, I now want to fit the X9 back on. It's as new, the shop supplied it in a box when I picked up the bike.
When I bolt it on to the hanger, the cage barely moves under finger pressure (no cable installed). It doesn't swing down to any degree, it just moves a bit inwards, a bit down then strikes the cassette and stops.
It goes nowhere near to opening as much as the pic here http://www.sram.com/sram/mountain/products/sram-x9-type-2-rear-derailleur
Even off the bike, cage movement is very restricted. Surely the cage is supposed to be able to swing way down (as if taking up chain slack) without moving in.
What am I doing wrong? I don't see how the RM can work like this.
(I've built bikes before, I'm well aware of limit screws and the B screw - I'm sure that's not the problem).