GTA

All Springer/NP/PCP Air Gun Discussion General => PCP/CO2/HPA Air Gun Gates "The Darkside" => Support Equipment For PCP/HPA/CO2 => Topic started by: longislandhunter on October 29, 2011, 02:39:31 PM

Title: Benjamin Pump Diagram
Post by: longislandhunter on October 29, 2011, 02:39:31 PM
(http://i114.photobucket.com/albums/n260/longislandhunter/Benjypumpinternaldiagram.gif)

Will add this video showing disassembly and reassembly proess.

http://www.youtube.com/watch?v=BVU59gqQxtA&feature=player_embedded# (http://www.youtube.com/watch?v=BVU59gqQxtA&feature=player_embedded#)
Title: Re: Benjamin Pump Diagram
Post by: CharlieDaTuna on October 29, 2011, 09:18:06 PM
Thanks Jeff... a great contribution.  ;) ;)

Title: Re: Benjamin Pump Diagram
Post by: longislandhunter on October 29, 2011, 09:21:32 PM
Thanks Bob.  I had thought about putting it in the "Library" but I don't know how to do that so I put it here,, guess it's as good a place as any  :)

Jeff
Title: Re: Benjamin Pump Diagram
Post by: ezman604 on October 27, 2014, 05:45:32 PM
Adding something new to an old sticky. :)
Thanks to Geoffrey_K for taking the time to create a downloadable and printable instruction set for disassembly and repair of this hand pump.
Please check the GTA Library for the Benjamin Pump rebuild instructions.
THANKS Geoffrey!!!
http://www.gatewaytoairguns.org/GTA2/PDF/Benjamin%20Pump%20rebuild%20document.pdf (http://www.gatewaytoairguns.org/GTA2/PDF/Benjamin%20Pump%20rebuild%20document.pdf)
Title: Re: Benjamin Pump Diagram
Post by: vigilandy on July 13, 2018, 04:31:36 AM
Update courtesy of nervoustrigger:

O-ring #5 in the diagram must be a -211, not a -210.  This O-ring serves double duty...it is in a wide groove and must slide up and down to work properly.  A -210 is too tight to function reliably but a -211 is just big enough to allow it to slide to each side of the groove on the up and down strokes.

At some point along the way, Sun Optics posted some updated instructions on their site and it has this O-ring identified properly.
http://sunopticsusa.com/content/HP%20REPAIR%20INSTRUCTIONS.pdf (http://sunopticsusa.com/content/HP%20REPAIR%20INSTRUCTIONS.pdf)

Thank you for watching out for GTA members Jason!