Hi and welcome to
FixYa, I am Kelly. I apologize for the much delayed response but I was helping another customer and your post appeared after I answered that post so I am going to respond now.
You will have to determine the part number of your Air drive.
The seals are dried out and cracked. Also the spring for the trigger is probably broken or the plunger is stuck down.
The CP828 parts can be found here:
http://www.ereplacementparts.com/chicago-pneumatic-cp828-t022708-3834-ratchet-parts-c-36298_36356_36369.html
The parts you probably need are items 3, 5, 7, 30 and 34. Possibly even item 109. That just repairs the trigger. You still need to repair the motor and head. See item 800 of the link for the repair kit. $33.75 Also note what item numbers above are in the kit.
The repair kits can be also located here:
http://www.pneumatictoolsonline.com/HTML%20pages/Tune%20Up%20Kits.htm Notice there are several versions of the CP air motors. I send this link because there are three types of ratchet heads and it lists both the CP828 and CP886 repair parts.
You should be able to breathe life back into this thing with just a repair kit.... and possibly a few other trigger parts.
Thanks for choosing
FixYa,
Kelly
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