Hi John just wondering if you could help me out wit this before I bring the pump into a rebuilder who may or may not be able to repair my pump.

It seems to me that the pump is locked up. I went to start up when it was very cold around 0 the keyway broke that goes between the hub and the shaft.i replaced the keyway and put the pump in a vice and could not get it to turn even with a big adjustable on the hub.does that sound like its locked or is it that these pumps are just really hard to turn? 

As far as the serial number of my crawler it is 1j\-498 the model is oc12-60-dl 

Thanks in advance for any help