Runaway Gun problem
Printed From: Tippmann Paintball
Category: Paintball Equipment
Forum Name: Gun Maintenace and Repair
Forum Description: Important info for keeping your marker in top shape
URL: http://www.tippmannsports.com/forum/wwf77a/forum_posts.asp?TID=123880
Printed Date: 17 May 2024 at 9:27pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Runaway Gun problem
Posted By: Spike44
Subject: Runaway Gun problem
Date Posted: 17 January 2005 at 9:00am
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Hi guys, newbie to this forum but hope to find some help. I have a 98 Custom that's developed a peculiar problem, it'll "runaway" after I shoot sometimes on the first shot, sometimes after a shot or two. It's like it's not re-cocking all the way and it goes into "full auto" mode until it either starves for air, or you grab the cocking lever and manually stop it from firing. I've replaced/tried different main springs, sear springs, even re-oringed the valve, and removed my double trigger and put the stock trigger back on all with the same result. Is it a problem with my valve that (re) o-ringing it didn't cure? Is it something I'm missing? The only irregularity I've noticed is my drive pin (operating rod) is very very slightly bent. Barely even enough to notice. It's not cause a visible bind in the main spring or and "roughness" in operation. Any help/suggestions are greatly appreciated. I already ordered all new internals from Tippmann this morning and they're on the way, but I was hoping someone could pin-point the problem for me...I'm stumped.
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Replies:
Posted By: rmorey
Date Posted: 17 January 2005 at 9:15am
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Check your sear. If it's worn too much it just won't catch the rear bolt properly (or consistently). Other than that, you've pretty much done everything you can. Your last resort is to let Tippmann take care of it. Send it in to them and they'll usually fix it for free (less the cost of parts). ------------- You are never beaten until you admit it. - G. Patton |
Posted By: Spike44
Date Posted: 17 January 2005 at 9:23am
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Thanks for the encouragment. It's very frustrating when you think you know what you're doing but still can't find/diagnose the problem. I have replaced the sear recently, and the leading edge looks nice and crisp. I'm hoping the new valve and other parts will cure it...but I'm still curious as to why it's doing this.. |
Posted By: LordJovian
Date Posted: 17 January 2005 at 2:31pm
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Have you oiled the valve? Could be the valve pin isn't opening all the way to allow air to push the rear bolt back enough. Might also be blockage in air supply lines. More than likely it is the CVX. After you get your replacement, take apart the old CVX and see what the problem was. ------------- A-5 E-grip Chipley Custom Carbon Graphite 16" Evil Adapter(Spyder) 32 Deg New '03 XChamber Remote Line Gun Sling Sniper f/x Stock LPK 68/4500 HPA R-5 CP Reg JCS Duel Trigger |
Posted By: bravecoward
Date Posted: 17 January 2005 at 5:45pm
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low on co2? lol
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Posted By: Shadowminion
Date Posted: 17 January 2005 at 8:44pm
Or possibly Cold CO2 , Tis the season and all  ------------- SL68-II , micro honed and polished .688" bore . Tuff Enuf . Widowmaker , under construction |
Posted By: Spike44
Date Posted: 18 January 2005 at 10:52am
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I don't use CO2, I use HPA..and have tried several tanks of various fill..it's not a "supply" problem. LordJovian, I agree, I'm hopeful/optomistic that the new valve will hook me up. It's gotta be something I've over-looked inside the valve. |
Posted By: eaglesin05
Date Posted: 18 January 2005 at 8:42pm
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I had an expansion chamber with a vert adapter and a remote line and my
gun was doing that to me at my friends house. I field stripped the
eintire thing and tok out the vert adapter and expansion chamber. I
know its not the same problem but it was doing the same thing
------------- Camo'd 98C Remote Polished internals Dbl trigger 14" J&J Ceramic Barrel Rocket Cock 2 Trigger Slop Mod 12V Revvy 03' Dye stikies R/T Drop Forward |
Posted By: footballz31
Date Posted: 18 January 2005 at 9:36pm
Sell it on ebay and get a new tippy  ------------- Tippmann 98 Custum Smartparts Progressive 14" barrel |
Posted By: Mack
Date Posted: 20 January 2005 at 2:07pm
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Could be a blockage in you air line from the ASA to the valve. You'd need another airline to test this theory. I would discount it if you are still getting good velocity. ------------- 
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Posted By: clownshooter
Date Posted: 20 January 2005 at 9:24pm
| If it is not the sear, it could be the cup seal in the valve. My Pro-Carbine did the same thing, only it was off and on. I replaced the valve and the problem vanished. |
Posted By: iceman1186
Date Posted: 22 January 2005 at 9:33pm
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Well, if you havent already make sure that the valve bolts on the side of the gun are tight. ------------- 
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Posted By: mod98commando
Date Posted: 23 January 2005 at 10:33pm
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You may also want to check the o-ring on the rear bolt. This o-ring has
to be in good condition for the valve to be able to blast the rear bolt
back enough for the sear to catch it. If it's broken or damaged and
isn't making a good seal with the valve then it could definitely cause
your problem.
------------- oreomann33: Everybody invades Poland Rofl_Mao: And everyone eats turkey Me: But only if they're hungary Mack: Yeah but hungary people go russian through their food and end up with greece on everyth |
Posted By: twistedkev1990
Date Posted: 28 January 2005 at 8:49pm
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I had the same problem. It was a combination of a cracked slightly cracked powetube and a bad sear. You might want to look real close at you powertube and look for a crack. -------------  http://img145.imageshack.us/my.php?image=98c23es.jpg">
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