Making Replacement Packing for 37MM Antitank Gun Recoil article

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Kim Sievert
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Making Replacement Packing for 37MM Antitank Gun Recoil article

Post by Kim Sievert » Sun Mar 03, 2019 12:05 pm

Making Replacement Packing for 37MM Antitank Gun Recoil system article.
https://apps.dtic.mil/dtic/tr/fulltext/u2/a479876.pdf
Hope this helps somebody with a M3 37mm AT gun
Maybe applicable to other recoil systems ?
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waterdawg2004
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Re: Making Replacement Packing for 37MM Antitank Gun Recoil article

Post by waterdawg2004 » Sun Mar 03, 2019 1:17 pm

Thanks, will have to put that in my files.
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Re: Making Replacement Packing for 37MM Antitank Gun Recoil article

Post by novectaner » Thu Mar 07, 2019 5:44 pm

I had to make a mold and injected polyurethane of the appropriate durometer to make replacement seals for the recoil rod of my 75mm pack howitzer. After a couple attempts and better technique, I was able to get some very good results. Of course the piston seal and the stuffing box seal are not the same size so two molds were needed. The old seal had a flat spot on the perimeter that prevented the seal from working when the hydraulic fluid was pumped up to operating pressure.
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