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Pump Lubrication

Discussion in 'Anything Airgun Related' started by Lydford, Jan 31, 2014.

  1. Lydford

    Lydford Posting Addict

    Messages:
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    Location:
    Tetbury - Cotswolds
    Does anyone ever use lube on a stirrup pump? If so what?
     
  2. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Had my fx pump for 2 years, its done a Censored load of pumping!

    It feels and sounds the same as the day I got. If its supposed to be lubed, then I didn't know that
     
  3. Lydford

    Lydford Posting Addict

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    Location:
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    I have the Webley Tri-Pump and it is working as well as ever. I just tend to lube stuff which is lubable but I guess 'if it ain't broke don't fix it' ...?
     
  4. 1961nuffield

    1961nuffield Honorary Member

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    Location:
    Originally E&S York's now SE Finland
    Use silicon based lubes as oil based ones can explode when compressed, so not a good idea. I have a can of silicon spray I use for mine, helps o rings as well.

    HTH

    John
     
  5. clbarclay

    clbarclay Engaging Member

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    Location:
    Worcester
    I only lub a pump when rebuilding.

    Word of caution, NBR o rings are fine for most seals in a pcp pump, but not the tiny one on the final stage unless you want a loT of practice stripping and rebuilding them. I spent a long reading up on what lube to use and there are almost as many different answers given as repplies. My pump is a Sun Optics (Gunpower, Airforce etc.) which were the ones origionally meant to be lubed with 30w motor oil, although I couldn't find any examples where the use of mineral was the direct cause of failure it still doesn't sound like the right stuff to be using. I've ended up using Molykote 33 medium, which is silicon oil in a lithium soap. High pressure pumps area not an application it was intended for, although it is what Theoben supplied in service kits, it works well and should be a little better than plain silicon grease for any metal on metal contact within the pump (I couldn't get a clear answer as whether silicon gauling was a problem with just steel on steel, or steel on brass as well). Plain silicon grease from dive shop is probably the most popular lubricant for pumps.
     
  6. dekka

    dekka Engaging Member

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    Location:
    Saltburn by the sea
    it is recommended that a smear of grease is put on the shaft every use due to the high heat generated (this from the maker when my sons pump was returned for repair) as this caused the seals to start to disintegrate, they also sent a small ack of lithium grease with the pump on return
     
  7. clbarclay

    clbarclay Engaging Member

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    Location:
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    I'm sceptical how much benefit regular lubing just the exposed section of a multi stage pump would have. I only have a BSA Ultra so its not like pumping up a large cylinder or buddy bottle, however heat has never been a problem. Lubing the critical final stage o rings will need disasembling the pump to do.

    I origionally bought a lot of NBR shore 70 (cheap) o rings for it, of which only the one on the high pressure rod kept failing after only a few refills, the identical o ring on the high pressure check valve was fine, so it was just wear due to movement that was critical. Both tiny o rings are subject to the same pressure and temperature. Having replaced that one tiny o ring to PU shore 90, so far it hasn't worn out since. PU and NBR have similar max temperatures, but the PU is far more wear resistant.

    On that note my pump was second hand and had signs of corrosion, so I lightly sanded all the surfaces o rings ran against with fine wet & dry paper to smooth any rough patches. It helped, but with the NBR o ring it still bid not last.
     
  8. critter

    critter Donator

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    Location:
    chesterfield
    Go to the hills pump website and download the instructions, I would say only requires a little after every 6 fills or so and only on the outer shaft. Some grease works it's way to the bottom of the shaft so can use that ro smear back over it again.
     
    Bagster66 and Kyriakos like this.
  9. DenTB

    DenTB Donator

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    Location:
    Perth Scotland
    You could always ask some of the guys at a mountain bike shop, they work on pumping the hydraulics on their downhill shock absorbers etc, my local guy said to me, hell pump up my Hw90 and Theoben, as and when i get the connections . A sound young bloke, hope you get what you need .
     
  10. tomsteebs

    tomsteebs Donator

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    Location:
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    I used moly, (gun grease that grey stuff usually made by Abbey in a tiny white pot)
     
  11. Kyriakos

    Kyriakos Member

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    So after 6 fills, I have to disassemble the pump? I have the mk4.
     
  12. critter

    critter Donator

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    chesterfield
    Dicer and pjgtech like this.
  13. Kyriakos

    Kyriakos Member

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  14. Bagster66

    Bagster66 Posting Addict

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    Location:
    Ille et vilaine
    I have a hills MK4, I use lube every couple of months but very little and on the shaft only.
    50 pumps let it cool down seems to be the most important aspect if I'm being honest
     
  15. td_boy

    td_boy Donator

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    Location:
    Norfolk
    Funnily enough wondered about this myself the other day as thought mine feels slightly drier than I remember.
    I was toying with the idea of introducing a drop or two of Crosman Pellgun oil via the air intake...
     
  16. mattw975

    mattw975 Keyboard Hero

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    Location:
    I left my heart in Newbury
    Hills supply silicon grease with every new pump, use silicon...never oil based greases.
     

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