Gehmann hand pump diagram

Seamaster · Post by **Seamaster** » Sun Dec 05, 2010 8:32 pm

I have a hand pump that is over oiled and leaking air.

I bought it from a friend. He told me it is made by Gehmann.

The rubber handle has "made in Finland" printed on it.

Does anyone have a diagram of this pump? I would like to change all the seals.

kevinweiho · Post by **kevinweiho** » Mon Dec 06, 2010 1:25 am

Hello, Seamaster:

I can provide you with a diagram, just e-mail me: kevinweiho@yahoo.es

The pump says Gehmann, but it is actually made by FX and is probably the 3 stage version. If you try to contact FX on how to change the seals, forget it because i have already tried, and they will not help you out.

Also do not oil the pump. When the internal shaft becomes dry it requires a small amount of silicone grease to smoothen the action.

Please tell us if you were able to change the seals. Almost everyone that i asked told me that the FX pump is virtually impossible to fix.

jipe · Post by **jipe** » Mon Dec 06, 2010 5:17 am

Gehmann is a big german reseller, they do not make any product.

There are several versions of the "Gehmann" pump.

To identify which one you have, the best would be to put a picture of your pump.

Reinhamre · Post by **Reinhamre** » Mon Dec 06, 2010 5:20 am

Is it this one you are asking for?
http://www.fxairguns.com/_pdf/detail/Ha ... rawing.pdf
Kent

Seamaster · Post by **Seamaster** » Tue Dec 07, 2010 12:21 am

That is the Gehmann hand pump I have.

Today, I break it down and wipe off as much oil/grease as I can. I can pump pressure up to 3000 psi, but the inner tube just does not feel smooth. It is a bit grabbing and loose at the same time.

I just don't know how to get to this inner part.

motorcycle_dan · Post by **motorcycle_dan** » Wed Jul 01, 2015 12:29 pm

I have one of the Blue Gehmann hand pumps. I have the 3 stage type (without the valve in the middle of the handle)
I downloaded the exploded view of the pump and bought the kit from Airguns of AZ. Mine was a slight bit different (or I couldn't get it all the way apart) Ordered another kit and going after it with increased vigor. Clean everything then lube with a light coat of silicon. Right now it acts as if you are lifting a spring, it just pulls real hard and does not pump it over to the next stage.

I WISH there was a how to video or instructions.

seamaster · Post by **seamaster** » Wed Jul 01, 2015 1:24 pm

I gave up on that inner tube project long time ago. Almost impossible to get into that inner tube without proper diagram.

End up getting Daryl Szarenski's Hill air pump after he gave up on air pistol shooting.

kevinweiho · Post by **kevinweiho** » Thu Jul 02, 2015 2:34 am

motorcycle_dan wrote:I WISH there was a how to video or instructions.

There is a video that shows a rebuild, but does not show you how to disassemble the inner tube.

www.youtube.com/watch?v=RRE4RvyRi7A

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Gehmann hand pump diagram

Gehmann hand pump diagram

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