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Air Gun Home Forum Index » General Air Gun Questions and Topics » Benjamin pump lock-up    View previous topic :: View next topic  Benjamin pump lock-up   Posted: Mon Dec 05, 2011 6:59 pm domer_pyle Senior Member Joined: 17 Sep 2009 Posts: 523 Anyone know why they do that? SunOptics is sending me a free rebuild kit this week, but I've taken everything apart and it's all sound. O-rings all look brand new, no wear or damage to speak of. Just wondering what could possibly need replacing   Posted: Mon Dec 05, 2011 8:10 pm AirGunEric Site Admin Joined: 20 Jan 2007 Posts: 6930 Location: "Out There" Sun Optics are not very organized, or all that reliable- much like their pumps are at times. That being said, when you say "locked up" you mean you cannot compress the pump arm? _________________ ` I'd say "I care." But I'd be lying. Canadian Airgun Supplier: http://www.scopesandammo.com/storefront   Posted: Mon Dec 05, 2011 10:03 pm radar Silver Status Member Joined: 13 Nov 2011 Posts: 1138 Location: Des Moines, Iowa, USA Does anyone make a good hand pump? I hear nothing but bad about everything on the market (that I can find.) _________________ It's never too late to have a happy childhood.   Posted: Mon Dec 05, 2011 10:31 pm AirGunEric Site Admin Joined: 20 Jan 2007 Posts: 6930 Location: "Out There" Seems to be a bit of a crap-shoot. The Benjamin/AirForce/Sun Optics pumps are the most dubious (and also the cheapest). _________________ ` I'd say "I care." But I'd be lying. Canadian Airgun Supplier: http://www.scopesandammo.com/storefront   Posted: Tue Dec 06, 2011 2:08 am domer_pyle Senior Member Joined: 17 Sep 2009 Posts: 523 It starts off normal but gradually gets tougher to pull up. When it can still be fully extended it pulls itself down a few inches if you let go of it, more and more til it pulls itself almost all the way down, like there is suction pulling it. Everything seems fine when it's apart which is why I really can't figure it out   Posted: Tue Dec 06, 2011 10:47 am SMP Silver Status Member Joined: 04 Feb 2011 Posts: 1183 Location: Just south of "Out There"- Land O Lakes Ontario Has it got a stock piston and valve or a custom setup? _________________ Sean   Posted: Tue Dec 06, 2011 12:53 pm domer_pyle Senior Member Joined: 17 Sep 2009 Posts: 523 Sorry, should have clarified in the original post. I meant the Disco hand pump   Posted: Tue Dec 06, 2011 1:41 pm AirGunEric Site Admin Joined: 20 Jan 2007 Posts: 6930 Location: "Out There" Are you sure the check ball is still intact? Sounds like it may not be stopping airflow properly. _________________ ` I'd say "I care." But I'd be lying. Canadian Airgun Supplier: http://www.scopesandammo.com/storefront   Posted: Tue Dec 06, 2011 6:16 pm domer_pyle Senior Member Joined: 17 Sep 2009 Posts: 523 If you mean that little rubber ball inside the top of the pump shaft then yes, but it does sound like it pops a bit when moving the shaft with the ends open. My first thoughts are that maybe there is a moisture problem, I wiped off all the excess grease from everything   Posted: Tue Dec 06, 2011 9:42 pm redone1992 New Member Joined: 28 Sep 2011 Posts: 3 Location: ohio usa domer_pyle wrote: If you mean that little rubber ball inside the top of the pump shaft then yes, but it does sound like it pops a bit when moving the shaft with the ends open. My first thoughts are that maybe there is a moisture problem, I wiped off all the excess grease from everything When my pump does that it is the small o ring on the iner shaft is bad it is size is 007. Go to the sun optics site they have break down of the pump. _________________ Don   Posted: Wed Dec 07, 2011 8:07 pm domer_pyle Senior Member Joined: 17 Sep 2009 Posts: 523 Very cool, I'm going to do that now and hopefully fill my Disco by tonight Benjamin pump lock-up     Air Gun Home Forum Index » General Air Gun Questions and Topics You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum All times are GMT - 5 Hours   Page 1 of 1   All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First  Select a forum Main Forums----------------AirGunHome Q&AGeneral Air Gun Questions and TopicsPicture GalleryTarget Shooting: Casual, Fun and CompetitionHunting, Pest Control, Varminting People/Events/Airgun Issue Discussion----------------Introduce YourselfThe BS TopicClubs/Events/Regional/Political Airgun Issues Maintenance, Modification and Reviews----------------RiflesPistolsAntique, Collector and Novelty AirgunsBB GunsPellets/AmmoOpticsAccessoriesAirgun Smithing Buy, Sell or Trade Forums----------------For SaleWant to Buy   Note: If you are seeing "Please enter your username and password to log in." 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