This one's for Enno. Grant really wanted to play with my old LEGO pneumatic dump truck. It's been assembled for 15 or 20 years, sitting in the basement of my parents' house. It needed some minor repairs and adjustments, but otherwise still worked! Well, after about one day of use, I heard a popping sound inside the pneumatic pump and it stopped working. We figured out that, internally, the rubber o-ring/piston had come detached from the rod you push. I found some LEGO enthusiast forums online and saw that others indicated it was possible to fix the pump. (A replacement would have been at least $20 - LEGO doesn't currently release any sets using this part.)
So with some effort, help from my dad, and, sadly, damage, I got the top of the pump off, cleaned the inside, relubricated with silicone grease, and now it works again! Not as well as it used to, but this is better than just throwing the part away. :)
p.s. you can see that the rear door doesn't open and shut like it used to... the support for the rear pneumatic output is cracking.
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