My 98C is jamming
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=174465
Printed Date: 22 November 2025 at 4:55am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: My 98C is jamming
Posted By: motopsycho650
Subject: My 98C is jamming
Date Posted: 30 March 2008 at 4:42am
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I've got a 5-6 year old 98C (SN: 476,xxx); polished receiver, R/T, Cyclone Feed, Super-fly front bolt, BT spring kit. All other internals are stock. The last few times I've played, I have had a rare issue of the gun jamming just short of the cocked position. It seems like the sear is actually grabbing and holding the hammer just short of the notch. The rear hammer is about 95% of the way back, but again, not actually fully cocked. This hasn't happened very often, maybe once or twice a day. I haven't noticed any kind of conditions that cause this. I can tell you that it has happened on both a full tank, and partial tank. Also, when disassembled, the gun parts don't have any unusual wear, and all seem to able to move freely. The sear & hammer notch are actually in pretty good condition for as old as they are. Today, I plan to slightly sand & smooth the bottom of the hammer, but I can't think of anything else that would be causing this problem. |
Replies:
Posted By: motopsycho650
Date Posted: 30 March 2008 at 12:14pm
| I think I may have solved this problem. Actually, I'm hoping I solved two problems at once. if you are curious, http://tippmann.com/forum/wwf77a/forum_posts.asp?TID=174466&PN=1 - read this . |
Posted By: Enos Shenk
Date Posted: 30 March 2008 at 2:35pm
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Yet another problem caused by silly front bolt 'upgrades'.
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Posted By: ammolord
Date Posted: 30 March 2008 at 2:49pm
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wow, why would you even mess with the bolt? ------------- PSN Tag: AmmoLord XBL: xXAmmoLordXx ~Minister of Tinkering With Things That Go "BOOM!"(AKA Minister of Munitions)~ |
Posted By: motopsycho650
Date Posted: 30 March 2008 at 10:36pm
The only benefit I really believe in is the cupped shape in the front. It has much more contact area with the paintball, and ensures the ball centers it's self in the bolt while being pushed. The stock bolt on my old Pro/Carbine has a partial cup molded into it, but the 98's went to a flat bolt that only contacts the ball in a small ring at the center. I really do believe the cupped shape helps prevent ball breakage. I bought the Super-fly because I wanted to see if the inner o-ring really made a difference. Well, odviously it did without being set up correctly. 1st off, when I got it, it was way too snug with the stock powertube. This was because of the rough plastic molding on the powertube. I sanded it down & smoothed it. 2nd, I learned this morning that the powertube is not perfectly centered in the receiver. In both my 98C & M98, it sits pulled towards the feeder side where it's attached. I figured out that 1 small strip of electrical tape next to each powertube bolt hole is almost the perfect shim to center the powertube. The stock bolt has some slop between it & the powertube, so the non-centered valve is probably overlooked. I am not 100% sure I've fixed my issues, but it makes sense. Like I said, the internals did seem more freely able to move. |
ammolord wrote:Posted By: motopsycho650
Date Posted: 14 April 2008 at 6:21am
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Ok, I have done everything I can think of here. I have ALMOST eliminated this problem. Yesterday, my 98c jammed as I described 4 times out of 2000 balls, much less than before. I was getting 3-4 jams/1000 before. Here's the stuff I've done so far; 1. The Stock bolt is back in. 2. I lightly sanded the two molded "dots" on the power tube to smooth them out. 3. Using electrical tape as shims, the power tube is visually centered in the receiver when everything is put together (much smoother operation than before). 4. Replaced the Hammer O-ring. (it was swollen & hanging-up in the power tube). 5. I lightly sanded & polished the entire hammer, including the bottom where the sear slides against it. Everything else was working perfectly. I had my PPS Stabilizer set to 600 psi, and was shooting a very consistent 275-285 fps. Just once in a while, the internals get stuck approx 1mm from being fully cocked. Just enough to where the sear doesn't engage the trigger, and I have to reach up & fully cock it before I can fire again. ANNOYING!! I honestly have run out of ideas here. ------------- Tunka.com - Working to keep paintball legal in Colorado's National Forests. Don't rainbow rocks/trees, be safe around non-paintball players, and please DON'T CHEAT Special Ops Brigade ID:161556 |
Posted By: Mack
Date Posted: 14 April 2008 at 10:52am
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Try replacing the hammer o-ring. If that doesn't work try adjusting the reg to increase input pressure. This will decrease efficiency, but increasing the input pressure combined with using the front velocity adjuster to bring the velocity back down will have the effect of increasing the "back pressure" in the marker that resets the hammer. (I can't guarantee it will work, but it is worth a try.)
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Posted By: oldpbnoob
Date Posted: 15 April 2008 at 9:25am
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I thought I read somewhere that Tippmanns are supposed to run with 750-800psi? ------------- "When I grow up I want to marry a rich man and live in a condor next to the beach" -- My 7yr old daughter. |
Posted By: motopsycho650
Date Posted: 17 April 2008 at 7:15am
I've read that too. Here's the thing. A 98C is sold as an unregulated CO2 powered gun. Using CO2, and no regulator, it is impossible to have your gun run between 750-800psi unless the out side temp is between 60-70 degrees out. I read from tippmann, that the CVX valve was designed to work at a pressure range of 350 - 1200+ psi. That is much more realistic considering temp changes & CO2. The 750-800 psi range is what they consider to be the best operating pressure. I'm running a Palmer's Stabilizer, a harder main spring, and have my stock velocity adjustment turn out pretty far, (Farthest out while still being able to split the receiver). I have been using my stabilizer adjustment as my velocity adjustment. I have great consistency, and save quite a bit of air because I'm adjusting the input pressure for velocity, not the output pressure which wastes air. I think my problem has nothing to do with pressure. The other 1996/2000 shots re-cocked just fine. The 4 shots that jammed, I believe is something inside binding up. Some one on specialopspaintball.com suggested I have the receiver bolts too tight. That makes more sense to me that anything else. Before the weekend, I'm thinking I'll try spacing the two receiver halves with a piece of electrical tape at strategic locations. That should eliminate any possibility of things being too tight and binding. If that doesn't work, I'll try upping the psi to the 700-800 range. P.S. Tippmann's customer service dept. has not returned my email in over 48 hours on this issue. And on a previous R/T problem, they provided me with a blow-off answer... What happened to the legendary Tippmann Customer Service Dept. from 5 years ago??? I'm getting annoyed enough at my 98C, that I've thought of going to Wal-mart & buying a new one. The problem is, they have changed the design so much, most of my upgrade parts won't fit the new 98C's. i.e. All my barrels are old style threads, etc. Now with the Platinum edition 98C's, there will be even more "New Style" upgrade parts. ------------- Tunka.com - Working to keep paintball legal in Colorado's National Forests. Don't rainbow rocks/trees, be safe around non-paintball players, and please DON'T CHEAT Special Ops Brigade ID:161556 |
Posted By: thejudge
Date Posted: 17 April 2008 at 8:57am
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I suggest upping the pressure and then using the actual velocity adjuster to adjust velocity. The extra pressure should help solve your problem. ------------- Stay low, run fast, and hope that paintball doesn't hit your... http://www.deltasquad.info/"> 
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Posted By: Mack
Date Posted: 17 April 2008 at 11:26am
Hmmm . . . this seems familiar . . . just can't put my finger on where I've seen this before.  -------------
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Posted By: thejudge
Date Posted: 17 April 2008 at 1:48pm
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just repeating the idea to make sure he saw it. figured if 2 people gave the same answer he would def try it ------------- Stay low, run fast, and hope that paintball doesn't hit your... http://www.deltasquad.info/">
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Posted By: motopsycho650
Date Posted: 17 April 2008 at 2:16pm
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We'll see... I'm playing on sunday. Problem is, what if the temp won't support 800 psi... I am in colorado, and it's still April. I don't know. I never had this problem before it was stored for 3 years while I recovered from a broken femur. Since then, it happened before I added the palmer's, cyclone, or spring kit mods. I am playing enough now to where I really want to figure this out. I will try both ideas on Sunday, and report back... ------------- Tunka.com - Working to keep paintball legal in Colorado's National Forests. Don't rainbow rocks/trees, be safe around non-paintball players, and please DON'T CHEAT Special Ops Brigade ID:161556 |
Posted By: StormyKnight
Date Posted: 17 April 2008 at 3:49pm
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Ooh ooh ooh! I think I saw it here -----v
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Posted By: motopsycho650
Date Posted: 18 April 2008 at 6:27am
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I understand fully what you guys are saying about the pressure. I know it's cause & effect on re-cocking. The pressure still doesn't answer my question, Why is it jamming??? If it was nothing but a pressure issue, then why isn't my gun double firing, or making the "out of air" fart noise? Like I said, I understand fully what you guys think about the air pressure. But, that CAN'T be the only problem. Something has to be binding inside for the internals to get stuck partially cocked. Pressure, or lack of pressure will not cause jamming by it's self, so what is the OTHER cause??? I'd be willing to bet money, than I can go remove my regulator, screw a heated tank straight into my gun, so that it would be getting over 1000 psi, and it will still jam. I know this because it did BEFORE I added the reg and lowered the pressure. Before I broke my leg, it shot flawless, at 100 degrees, at 30 degrees, it didn't matter what the pressure was. As soon as I pulled it out of storage, it jams. None of the additional mods I have added since then have effected the jamming, whether it be the regulator, the spring kit, etc. It jammed before I added them, and it jammed after I added them, so therefore, they can be eliminated as a cause of the problem. Tippmann finally wrote me back, they suggest loosening the receiver bolts as-well. Other than that, they said, "we're not sure what else could cause this, check your hammer & sear for wear." It's not a good sign when the guys who built the gun don't have a clue... P.S. I have read lots of articles, as well as played with people who have their 98C's running less than 600 psi without the LPK. Pressure times flow equals velocity. If you lower the pressure, and increase the air flow (i.e. heavier spring to hit the valve harder), you can get the same 300 fps as a stock gun. There is actually a science to it, matching the pressure to the outside temp to prevent shooting solid... ------------- Tunka.com - Working to keep paintball legal in Colorado's National Forests. Don't rainbow rocks/trees, be safe around non-paintball players, and please DON'T CHEAT Special Ops Brigade ID:161556 |
Posted By: oldpbnoob
Date Posted: 23 April 2008 at 11:08am
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Personally, I would try the pressure first and swapping out the bolt and tube next. I had a Dead on Tube/bolt in my 98c and it went nuts. With the cold weather here in Ohio added to the CO2, and high rate of fire with R/T, the theory is it cause the metal to swell and wouldnt let the rear bolt go in and out of the PT properly. Basically it was too tight. Took the PT out and havent had an issue since. ------------- "When I grow up I want to marry a rich man and live in a condor next to the beach" -- My 7yr old daughter. |
Posted By: thejudge
Date Posted: 23 April 2008 at 1:08pm
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i dont know if this was asked or not but are you running co2 or HPA? i assume co2 if it is that finicky in cold weather. Try HPA for a day if you can. see if that helps. ------------- Stay low, run fast, and hope that paintball doesn't hit your... http://www.deltasquad.info/">
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Posted By: motopsycho650
Date Posted: 23 April 2008 at 2:31pm
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Well, it turns out it was not the pressure, and it was not the receiver being too tight. It was, in fact, the BT spring kit for 98C's. I fiddled with all sorts of pressure settings and spring tensions. When I finally put the stock (6 year old) spring back in, and re-adjusted my palmer's, I achieved 285 fps, at ONLY 550 psi, and did not have a single jam in 1000 shots. I did all this without touching the stock velocity adjustment, which is still set the furthest out while still being able to split the receivers. Ends up the BT spring kit is a big pile of ____ (insert favorite 4-letter word). ------------- Tunka.com - Working to keep paintball legal in Colorado's National Forests. Don't rainbow rocks/trees, be safe around non-paintball players, and please DON'T CHEAT Special Ops Brigade ID:161556 |