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Discussion Starter · #1 ·
The piston assembly broke and scored the cylinder walls some. I bought and put a new piston in. Now when I connect air it slowly drives the piston all the way down without pulling the trigger, and leaks a lot of air. Is this from air leaking past the piston or something else?

Maybe I wasted money on the new piston and will need to buy a new gun anyway. I already have an NR83, but I really like the weight of this as my primary gun. The Bostich F21PL which shoots ticos too seems neat but I think people don't like Bostich for framers.

I don't do a lot of framing myself. 1000-5,000 square feet a year.

Here's the Hitachi parts list:
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