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Old 04-06-2013, 09:40 PM   #1 (permalink)
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Hammer 7 pump arm issue...

So, i finally got to play with my Hammer 7 today, and noticed something that i wanted to know if it was normal or not.

When aired up, after i would cock it, the pump arm would not push forward, i would have to manually push it back forward. However, if not aired up (since it won't actually 'cock' w/ no air) the spring would easily push the arm back forward.

Was wondering if this is normal, or if there might be something wrong with something inside to cause this to happen only when the hammer is cocked...

LOVING the clip fed pump though, awesome fun so far.
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Old 04-06-2013, 09:54 PM   #2 (permalink)
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Mine works the exact same way.
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Old 04-06-2013, 10:47 PM   #3 (permalink)
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So, whats the point of the return spring, if you have to manually return it while in normal use? I'm kinda confused.
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Old 04-07-2013, 12:45 AM   #4 (permalink)
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I've had nothing but problems with my Hammer since I got it - and (long story short) they won't touch it unless I pay for shipping and a part to get it fixed. Aside from the MAJOR problem with my marker, I encountered the issue you describe as well when trying to get it running.

In hopes that there would be compatible parts, I grabbed my old Hammer which hadn't been gassed up for over a decade, and it held air and fired perfectly, as did my old homebrew nelson which hadn't been gassed up in probably five years more. I prefer a Sheridan-based pump, but I have to acknowledge that the Nelson valve design is probably the most simple and reliable system ever made... Don't know how Kingman got it so wrong.
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Old 04-07-2013, 10:12 AM   #5 (permalink)
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Quote:
Originally Posted by panhead4411 View Post
So, i finally got to play with my Hammer 7 today, and noticed something that i wanted to know if it was normal or not.

When aired up, after i would cock it, the pump arm would not push forward, i would have to manually push it back forward. However, if not aired up (since it won't actually 'cock' w/ no air) the spring would easily push the arm back forward.

Was wondering if this is normal, or if there might be something wrong with something inside to cause this to happen only when the hammer is cocked...

LOVING the clip fed pump though, awesome fun so far.
This sounds like you are confusing the main spring with the return spring. The main spring will return a Nelson back all day long if not aired up. When aired up if there is no return spring then it will not return. Is there a spring on the pump arm somewhere? I don't have a hammer 7 but I own a few and have owned a few Nelson based guns. My nelspot which doesn't have a return spring does the exact same thing you are talking about.
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Old 04-07-2013, 12:17 PM   #6 (permalink)
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Yes, there is a return spring in the pump arm. Its not my first rodeo.

Other than this, i haven't had any issues, not even the ones most ppl were having with their guns out of the box (that were fixed by using the replacement parts sent with the guns). Heck, i didn't even have to turn my velocity yet as my paint bore match had me right at 280 fps.
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Old 04-07-2013, 12:21 PM   #7 (permalink)
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FYI... the springs on nelsons were never intended to "return" the pump like a snipers... It was meant to keep the pump from moving when the gun was cocked. Mostly this happened when running or moving.
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Old 04-07-2013, 12:52 PM   #8 (permalink)
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FYI... the springs on nelsons were never intended to "return" the pump like a snipers... It was meant to keep the pump from moving when the gun was cocked. Mostly this happened when running or moving.
Truth. But those were not undercocking kits; they tended to be thin low tension springs around a wide barrel. This setup is a small higher tension spring on a secondary guide rod - it really wants to return the bolt but doesn't quite do it. If my H7 worked I would try fiddling with the spring maybe replacing it but it's not worth me getting mad and smashing it since it wouldn't work anyway.
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Old 04-07-2013, 05:41 PM   #9 (permalink)
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my pump return works great. but i polished all the internals and the body then added a CCM return spring plus half the spider return spring.
Pump it back. let it go and it snaps forward.
it will get better with use.
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Old 04-13-2013, 12:26 AM   #10 (permalink)
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I cut down an old spyder drive spring and it does the trick for now. Seems a bit stiffer to pump, but atleast it returns forward now. Might play tomorrow with it and see how it does.
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