What was wrong with it, and was it fixable? I was having to break bolts free by hand before I could zip them out too.
I had two jobs in a row that needed high-torque from my impact gun, and it failed both jobs. This was the first one. The second was unrelated.
I was desperate to get the second job finished, so I tracked down the Snap-On Guy. Bought a new MG725, $375 plus tax, cash (slight discount from retail at that time.) They were over $500 when they were discontinued, now Snappy sells the PT850 for $600.
I keep whip-hoses on all my air tools. I'm pulling the whip off my old, weak air wrench--a formerly superb Snap-On IM510B. When I was working at the Bus Plant, this was the only 1/2" air impact that could properly tighten the large jam-nuts on the air conditioning pipes. I think the nuts (socket size) were 1 1/2 inches, and 1 7/8 inches. This is 3/4" impact territory. My Snappy would eat the brand-new company-supplied 1/2" IRs and CPs. I actually had to tell my crew to NOT use those impacts to tighten those jam nuts, because they couldn't get 'em tight enough, and then when the A/C hoses were attached--one of them used a brass (high temperature) O-ring which needed to be REALLY tight to seal--the copper tubes would wind-up when the hose was installed. Then we spent hours removing and replacing the damaged copper tube.
Anyway, I'm pulling the whip hose off my 510B to install on the shiny, new MG725. It suddenly occurs to me that in all the years that I've had the 510B (about six years professionally, at the bus plant, then another six or ten with hobby use, and I bought it from the Mac Guy as a used tool, so it was actually older than that)
I'd never, ever cleaned the screen on the air inlet in the handle.
So I pull the air inlet fittings out, and I find the screen is 1/3 plugged with crap that made it through the air hose, or fell into the air inlet. I clean out the crap, put it all back together, and I used that 510B again while my brand-new MG725 went out-of-warranty sitting in my tool box.
Eventually I sold the 510B on Craigslist for $80 or $90, which was about what I'd paid for it all those years ago, and started using the MG. Yeah, the MG is more powerful than the 510B...but that 510B did me proud for many, many years.
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1. Don't forget to clean the air-inlet screen now and then. For that matter, change the oil in the impact case (some models) or squeeze in some fresh grease (other models.)
2. If there's an actual broken part inside an air tool, I've purchased repair parts for a Mac 3/8 impact through Power Tool Repair in Ohio. They seem to have an EXTENSIVE selection and inventory of parts for dozens of brands and hundreds--maybe thousands--of models.
https://www.powertoolrepairohio.com/
3. Remember that air tools are -usually- rated for power with 90 psi. That 90 psi is AT THE AIR TOOL INLET, WITH THE TOOL RUNNING. This probably means that there's 120+ psi in the air tank. My system runs with the tank at 135 psi to get a steady 90 at the tool, with the tool running. Most single-stage air compressors will NOT be able to keep up, so the air pressure--and tool power--drops. When I still had a single-stage compressor, I took the regulator OFF, because I needed every bit of air the thing could deliver. God bless two-stage air compressors!