Older IR 2135Ti 1/2" impact gun - body of gun shakes like crazy with almost no power at output. I took it apart expecting a bad anvil but didn't see anything broken or any obvious signs of wear. Any suggestions?

The I.R. 2135Ti or TiMAX has some known issues with the trigger o-ring (item# 22A) swelling, the throttle valve (item# 28D) bending or breaking, and the throttle valve seal (item# 28E) wearing out or deteriorating. Procedure wise you should not be able to remove the trigger without first removing the inlet bushing assembly (item# 26) the reason is that the reverse valve (item# 24) keeps the throttle valve from tipping forward and releasing the trigger, there is a slot for the stem of the throttle valve to slide into.
Follow this link to the parts list:
http://manualarchive.ingersollrandproducts.com/ir_pdfs/Tools/Vehicle%20Service%20Tools/Air%20Impact%20Tools/45534070_ed3.pdf
When reassembling the tool first install the inlet bushing assembly and then install the trigger, make sure to lube the o-ring before inserting.

The IR 2135-k303 air inlet repair kit along with a IR 2131-322 inlet removal tool should fix your problem.

This gun shouldnt have an adjustment. If you cfm's from your compressor are enough. Too low cfm's mean lower torque. If cfm is high enough for the gun rating then I would say the gun is bad.

Sounds as though you have broken or worn hammers. Try KCTool 715 445 7700. They can and will help you.

you need special tools to disassemble the air inlet - and i have it

try going to irtechpubs.com nd under industrial tools you will find your model number and can download a breakdown for it. Let me know if you have trouble, I went thru about 15 sites before I found it.

if air sound comes out when you press trigger your pressure regulator pin is stuck-oil gun and attach hose repeate until pin frees or remove pin and clean with brake kleaN oil and replace

NOT exactly a solution, but may help you with your problem: I'm also a Owner of a 261 ( In fact 90% 0f all my Air Tools are IR) that I used everyday when I was working on Terex Equipment & EMD Locomotives. I "Upgraded" the Major Parts inside my Gun to the "Industrial Line" rather than the Automotive Parts since the 261 is classified as a Automotive Tool..and Installing an Adjustable Regulator on the Gun Helped a Lot too...by "tweeking" my Gun out, I was Pumping almost as much torque as some of the 1" Guns...
FYI: Don't Over Oil as the Oil will absorb into the Vanes, causing them to Expand in thickness "Permanently"...just 2-3 drops of a Hi-Grade Air Tool Oil before starting the Day is enough...sounds to me like your Picking up some contamination someplace??

Go to: http://www.irtools.com/contact/?pro=&cat=&sbu=&formType=ussales
make a Request for schematic, they have always given me great assistance.

not easy y did u take it apart