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

Does the 49 at the end of the serial tell me that its a 1949?