Benjamin Pump Diagram



Author Topic: Benjamin Pump Diagram  (Read 17003 times))

Offline longislandhunter

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Benjamin Pump Diagram
« on: October 29, 2011, 02:39:31 PM »


Will add this video showing disassembly and reassembly proess.

Small | Large
« Last Edit: July 10, 2012, 06:57:58 PM by ezman604 »
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Offline CharlieDaTuna

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Re: Benjamin Pump Diagram
« Reply #1 on: October 29, 2011, 09:18:06 PM »
Thanks Jeff... a great contribution.  ;) ;)

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Offline longislandhunter

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Re: Benjamin Pump Diagram
« Reply #2 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
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Online ezman604

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Re: Benjamin Pump Diagram
« Reply #3 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
Revelation 760 PumpMaster (Vintage 1967)
Powerline 1000S .177 (semi-tuned by me & innards by kiwi Pete)
Benjamin Super Streak .177/.22 (converted to NP & w/GRT-III)
Weihrauch HW97K .177
Benjamin Trail NP XL1100 (home tuned by muwah with Tuna trigger)
Stoeger X-20 RAMmed by Gene and Tuna trigger
Winchester 1000SX .177 (semi-tuned by muwah)
Winchester 1000B RAMmed by Gene
Crosman 1377 "Goldfinger"
Disco .22 Multi-Shot Custom

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Offline vigilandy

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Re: Benjamin Pump Diagram
« Reply #4 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

Thank you for watching out for GTA members Jason!

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