IR WS550 impact wrench

[samss]

I'm looking for a parts breakdown / tech manual for this old impact wrench. My pa-inlaw says he bought it in the early to mid sixties. Bushings or bearings must be wearing out considering the sounds it makes.
My googlefu isn't working very well.

 

[bcradio]

Is he looking to fix it? Seems like it's had a good life and ready for retirement to bring in a new 2135 or something.

 

[samss]

Just trying to get some more life out of it. He used it alot in the sixties, since then it has sat in the tool box most of the time.