Maybe they were neoprene at some point

deanostoybox · Sep 29, 2017

Pulled top cover, pulled cylinder, popped out piston, wonder why it leaks

Here is a picture of the front or O-ring side of the remnants of the backup washer. At first sight I thought it was leather. On first touch, it obviously wasn't.
<a href="https://deanostoybox.com/8N-sediment-bowl/o-ring-side-of-backup-washer.jpg">

o-ring-side-of-backup-washer-s.jpg" width="800" height="600" alt="o-ring side of backup washer"

</a>

Here is a picture of the back side of the remnants of the backup washer.
<a href="https://deanostoybox.com/8N-sediment-bowl/back-side-of-backup-washer.jpg">

back-side-of-backup-washer-s.jpg" width="800" height="600" alt="back side of backup washer"

</a>

Hit on end with my BIC lighter, bust into yellow flame with a lot of black smoke. Smells like burning tire. Definately not Teflon (PTFE). PTFE is slick. This is not. More rubbery, but harder than O-ring "rubber". More like a dried out O-ring in hardness, but still plastic like vinyl.

Here is a PTFE backup washer.
<a href="https://deanostoybox.com/8N-sediment-bowl/teflon-backup-washer.jpg">

teflon-backup-washer-s.jpg" width="800" height="600" alt="teflon backup washerback-side-of-backup-washer.jpg"

</a>

PTFE does not support combustion. You have to try pretty hard to burn it. You don't want to smell it when it burns. Pretty nasty stuff.

Walston · Sep 29, 2017

Looks like leather to me. It would burn and stink like that from the oil on it.

Tim PloughNman Daley RIP · Sep 29, 2017

It does look like leather to me too, or maybe even just a plain rubber drain plug gasket? Try slicing it with a knife and see if the inside is still unsaturated with oil. Stretching it will tell us too -leather will tear, rubber will spring back.

TPD

deanostoybox · Oct 20, 2017

I finally got around to removing the small piece of backup washer from a jar of alcohol where it has been soaking for a couple of weeks. Turns out it is leather, just has a bit of rubber stuck to the front side. Interestingly enough the bit of rubber matches the missing rubber from the O ring. Looks as if whoever was in there before me glued the backup washer to the O ring. Not surprising really, whoever it was was glue happy. All of the gaskets (including the pump) had been glued down with some really powerful adhesive, all the bolt holes were filled with blue silicone. The tractor had been split before between the transmission and hydraulics, and there was a considerable amount of blue silicone that had squeezed out on the inside. Cleaned out all of the excess silicone from inside the hydraulic compartment and put it back together with all gaskets dry, used anti-seize on the housing bolts though. Fun fun fun.

later
deano

Maybe they were neoprene at some point

deanostoybox

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Walston

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Tim PloughNman Daley RIP

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deanostoybox

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