Need advice on FX hand pump lube

[Nessmuk]

Compressed air is just that it is atmospheric air compressed, and the atmosphere is 78% Nitrogen & less than 21% Oxygen, so the inert N2 acts as a "damper" to the O2 content.

Doesn't stop internal combustion engines from working does it? They only get their oxygen from the atmosphere. I'd say it's unlikely you'd end up with the right oil and compressed air mix for it to combust, but there must be a small chance that you could, surely? Worth avoiding the wrong oil for that reason I would think.

[angrybear]

Doesn't stop internal combustion engines from working does it? They only get their oxygen from the atmosphere. I'd say it's unlikely you'd end up with the right oil and compressed air mix for it to combust, but there must be a small chance that you could, surely? Worth avoiding the wrong oil for that reason I would think.

True, but petrol engines require a spark to ignite the mixture and diesel engines require the fuel to be injected, atomised at high pressure and a precise measure. (as I stated in the line above the one you quoted )

Anything with a reasonably high calorific value can be made to combust if precisely the correct conditions are met, as slow_runner intimates a cloud of flour can be ignited with spectacular results, however that does not mean that a smear of 3in1 on a pump seal is going to.

[slow_runner]

More help needed thanks.
Despite being stripped down, cleaned, then carefully reassembled, the pump will only attain 150bar.
All manner of O ring grades have been tried to no avail. So now we are back to original spec with no change in behaviour of the pump.
Would we be correct in assuming that 150bar is the 2nd stage limit and the problem could exist somewhere in the final stage? But where, why?
Has anyone had similar results and what was the solution?

It is driving Jeff crazy; I'm Ok as I am there already

[smudger1234]

More help needed thanks.
Despite being stripped down, cleaned, then carefully reassembled, the pump will only attain 150bar.
All manner of O ring grades have been tried to no avail. So now we are back to original spec with no change in behaviour of the pump.
Would we be correct in assuming that 150bar is the 2nd stage limit and the problem could exist somewhere in the final stage? But where, why?
Has anyone had similar results and what was the solution?

It is driving Jeff crazy; I'm Ok as I am there already

I would check the final stage seal. This is the one most people substitute out for a cheaper commonly available o ring, needs to be the original PU spec; nitrile and viton dont cut it.

[slow_runner]

I would check the final stage seal. This is the one most people substitute out for a cheaper commonly available o ring, needs to be the original PU spec; nitrile and viton dont cut it.

Thanks for the advice smudger.
All the seals are as per the FX recommendation; the final stage seal is PUR90 grade.
In that regard our local supplier, Seal House, have been very accommodating with advice and service.

[angrybear]

How are you testing the pressure ? have you blanked it with a brass plug or are you trying it on a rifle ?

Could it be that the adaptor is leaking rather than the pump ?

[slow_runner]

How are you testing the pressure ? have you blanked it with a brass plug or are you trying it on a rifle ? Could it be that the adaptor is leaking rather than the pump ?

Hi angrybear.
I received a call from Jeff late last afternoon, he had a big smile in his voice
After isolating stages he discovered that a gland seal was passing. He has sorted that by resorting to using 3(?) smaller O rings.
I will know more when I visit next and I'll post images if possible.
He tells me that it now pumps up quite efficiently.
So much so that while pumping up his pneumatic air rifle, the old hose couldn't take it and blew out in protest

[Neil54]

When cleaning model aircraft engines, they would fire and run on WD40, also 3in1 I seem to remember.
Models use caster oil as a lubricant. I wouldn't put it in your pump though, dries to a sticky mess.

Lubricate with silicon based products.

[keithy]

If you read the info on the 3 in 1 container it says; contains petroleum distillates don't use near heat, from memory I remember my BSA meteor giving a loud crack if I put 3 in 1 down the transfer port. I definitely wouldnt use 3 in 1 in a pump pumping at 200 bar (3200 psi).

[greenman]

Nope....even the very benign looking abbey white silicone grease combusted ...like I said,the hills grease is spot on and the tub will last a lifetime.

[evert]

I bring up this old thread, as I just found a possible source of the mysterious FX-recommended grease for PCP pump lubrication, Fuchs Renolit RHF1:

https://www..de/itm/Fuchs-Renolit-RH...-/112402374510