Husqvarna 254 oil pump?

I have a Husqvarna 254 which needs a new oil pump.
I have stripped it down taking the clutch, barrel, sprocket and bearing off and have removed the retaining screws from the old pump.
I still cannot dislodge the old pump from the machine!
There is movement but it seems like it is still secured in place some how??
Any ideas on how to get the pump off??
Thanks in advance.
KB