My son helped me repair the 2590 seat last week. The plastic bushings are $40+ at the dealer and the pivot pin had worn slots in the plates so bad the seat would move 3" or more like a rocking chair.
So we welded some 1/8" flat to the outer sides of the plates, rebored them to 1/2", fabricated new rods from 1/2" shafts and 4 bushings later from McMaster and we are back in business for under $15.
Hardest part of the job was getting the seat assy in and out of the cab.
Thought this might help someone else out sometime.
Bushings:
http://www.mcmaster.com/#2938T12
So we welded some 1/8" flat to the outer sides of the plates, rebored them to 1/2", fabricated new rods from 1/2" shafts and 4 bushings later from McMaster and we are back in business for under $15.
Hardest part of the job was getting the seat assy in and out of the cab.
Thought this might help someone else out sometime.
Bushings:
http://www.mcmaster.com/#2938T12