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Thread: 4 PC BTFE/NBR/NYLON CATŪTYPE PISTON SEAl compression tool

  1. #1
    Supporting Member Frank S's Avatar
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    Frank S's Tools

    4 PC BTFE/NBR/NYLON CATŪTYPE PISTON SEAl compression tool

    This tool is basically a used wear ring clamped around the center of a 4 piece BTFE/NBR/NYLON piston seal to compress it back into shape after having to stretch it over the piston
    Normally when doing these cylinders I do them at home in my shop because I prefer to boil the nylon portion of the piston seal in water for about 15 minutes to render it soft and pliable making it much easier to install. I also have a range of tools I can use to reshape or compress it to its original size and form but being in the field yesterday some of these niceties were not available no hot water or means of boiling any and no piston ring compressor
    So I made do whit what I had it was warm yesterday so I laid the nylon ring on a shiny aluminum pate and allowed the sun to help warm it for about an hour while disassembling the cylinder on the excavator
    after installing the piston ring the nylon was badly stretched out of shape as always. I used an old wear ring plus a short piece of another wear ring to fill the gap not shown in the pic, and my chain vice grips to squeeze it back in shape leaving them clamped there for a few minutes did the trick just as well as my expensive ring compressors would have done.
    4 PC BTFE/NBR/NYLON CATŪTYPE PISTON SEAl compression tool-20201119_162658hsc.jpg

    4 PC BTFE/NBR/NYLON CATŪTYPE PISTON SEAl compression tool-20201119_162710hsc.jpg

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    baja (Yesterday), Jon (Today), NortonDommi (Today), nova_robotics (11-23-2020), Scotty1 (11-23-2020), suther51 (11-23-2020)

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    Thanks Frank S! We've added your Piston Seal Compression Tool to our Piston category,
    as well as to your builder page: Frank S's Homemade Tools. Your receipt:




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    Supporting Member suther51's Avatar
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    Thanks for this. The last cylinder I did i nicked the seal trying to get it all back together. And this was after asking advice from the "expert" at the hydraulic shop. Great tips, thanks again.

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    Try using rubber straps/slingshot rubber bands or similar items. The straps are flat, strong, elastic and about 0.6mm in thickness. Pass two rubber straps inside the seal, set part of the seal on the rod and with both hands pull the opposite part of the seal with the straps.


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