Small Engines (Lawn Mowers, etc.): replace lh lift link assy., adjustment nut, www3

Question
craftsman 18hp 42" my deck went down on left side so cutting was not level.I saw the the LH liftand could notturn or break feee the adjustment nut which in turning I broke it off.Now I have anew one & don't know how to break free the nut to put back on. it is a crownlock nut.Here's what I rec'd part#151141 link ASM Lift LH from sears. bought mower in feb04.model#917.272761

Answer
Did the part number change?

I checked out the Sears website, http://www3.sears.com/ typed in the mower model number to see exactly what part you were having trouble with but did not find part #151141.


Could you check out the Sears site and locate the part in the diagram.  This will help me determine what's going on.

Is the old nut rusted?
Let me know.
Eric