Gecko Faults

Here is a little background, just got an exact jr bare frame, and was
going to add my own motors/controls. Here is the mill
http://www.ameritechcnc.com/exact%20jr%20series.htm I asked them
what servos they use, and they said 16 ft lbs cleveland servos.
Direct drive. I got some off of ebay. I bought these motors
thinking they would be sufficient
http://cgi.ebay.com/ws/eBayISAPI.dll?
ViewItem&category=42895&item=3849879999&rd=1 . I got everything
hooked up, I have the accel/velocity turned way down. They fault
almost immediately. Is there something I am doing wrong, or these
motors just not up the the job at hand? Thanks