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98 Custom PS ACT -- Stuttering Issue

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oldpbnoob View Drop Down
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    Posted: 25 February 2013 at 5:01pm
Small clarification on HPA tanks. While all HPA tanks have to be rehydroed, only CF tanks have a lifespan and it's 15 years.  Aluminum tanks can be used indefinitely as long as they pass rehydroing. At least thats the way it is here in the States. Maybe Belgium is different? HPA tanks themselves have come down considerably over the past few years, but the compressors I know are still quite expensive.
 
Just my $.02.  


Edited by oldpbnoob - 25 February 2013 at 5:02pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jonas Hove Quote  Post ReplyReply Direct Link To This Post Posted: 25 February 2013 at 4:45pm
Wow, thanks a lot, I would've never thought about the added spring pressure being a possible problem (although, thinking about it, it is pretty obvious). 

I know CO2 isn't great, but I didn't/don't have the budget to make the switch to HPA, especially since everything was working fine untill the new markers arrived.

So I don't have any HPA tanks at my disposal, but I'll try and switch the hammer and linkage arm from one of the old markers with one of the problematic ACT's and try it out while it's still cold. I will get back to you on that.

Anyway, winter's almost over here, so the problem might dissappear on its own :)

Funny thought that downgrading might be the solution to my problem.

Once again, thank you for your help!

Jonas


Edited by Jonas Hove - 25 February 2013 at 4:47pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mack Quote  Post ReplyReply Direct Link To This Post Posted: 25 February 2013 at 3:24pm
The CO2 is probably a large part of your problem.  It just really isn't a good cold weather propellant due to its temperature sensitivity.  The best test to verify this would be to try one outside, then bring it in, let in warm up and try it again.

It also wouldn't surprise me if it was the ACT markers acting up because of the CO2.  The ACT system adds additional spring pressure which must be overcome by the propellant to reset the rear hammer.  If operating pressure is already reduced because of the cold that additional resistance might be sufficient to cause problems.

Do you have any compressed air tanks you can try on one of the malfunctioning markers?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jonas Hove Quote  Post ReplyReply Direct Link To This Post Posted: 25 February 2013 at 1:39pm
Sorry for making a mess of your forum.

I am familiar with proper marker maintenance, and keep my markers well in check. 
No upgrades or modifications have been made to the markers. 
There is no discernable wear on the hammer and sear, allthough I do feel the sear pin sits quite loose in the right side receiver. I however cannot put this down to wear, as these were bought as back-up markers last summer, and haven't seen more than 4 days of action (= 3-5 cases of paint each max).
Replacing the valve with one out of the older, rental versions of the 98 PS (also replaced the powertube the valve was in) seems to have solved the problem in that marker.
I'm shooting CO2, and now that I think about it, I didn't hear complaints about this the first time they were used (during the summer). So I guess they just can't handle the CO2 below 8C. But, since my other markers (98 PS rental, bought in the USA) have no problem with it (played this weekend in minus 3C), I feel this isn't acceptable.
The thing that really got me thinking there was a general manufacturing fault, was that out of these 10 new markers, 7 were showing the same symptoms of malfunction. 
Maybe also important to note that, allthough I ordered rentals, my wholesaler (this time in Germany) delivered customs, of which some are ACT's. I can't remember right now if there were any non-ACT markers malfunctioning.
These markers are still under warranty (purchased 2011), allthough they have not been registered on the tippmann site.

Thank you for your time,

Jonas Hove
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mack Quote  Post ReplyReply Direct Link To This Post Posted: 25 February 2013 at 11:10am
This probably should have been put in a new thread;  the bumping of year-dead posts is generally frowned upon here.  However, as this is on topic and a general question rather than one aimed at a specific poster I'll try to help.


Originally posted by Jonas Hove Jonas Hove wrote:

Hello,

I'm new on this forum, but I've been renting out paintball supplies for 4 years. I never had problems with my 98 PS Rentals, but I now have the same problem "stuttering" with 8 out of 10 new markers I bought in june 2011.

Can someone please help?


More information would help us help you.  Things it is useful for us to know would be any modifications made to the markers, air source that is used on them, conditions that stuttering occurs under, etc.  However, I can give a few general guesses/pieces of advice that might help even without the additional information.

If you aren't regularly oiling/maintaining the markers, do so.  There is a general paintball guide in the new players section that has some maintenance suggestions in it.  Here is the short version:  A half-dozen or so drops of oil in the ASA before each use followed by about thirty shots of firing without paint and a squeegee down the barrel will keep the internals well lubricated which does wonders for performance.  It doesn't hurt to put an additional drop or so of oil on the side of the rear hammer that you can see near the charging handle, on the spring you can see inside the marker and on the other side of the chamber beyond the spring.

Specific to stuttering, you should check the sear and bottom of the rear hammer for wear as well as checking the condition of the o-ring on the front of the rear hammer.  (Worn parts may not properly catch and a bad o-ring will allow air to get past the hammer decreasing the amount of force pushing it back, which could keep it from going back far enough to catch on the sear.

Additionally paint debris or build-up inside the marker can add additional friction which keeps the hammer from going back far enough to reset on the sear as well.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jonas Hove Quote  Post ReplyReply Direct Link To This Post Posted: 25 February 2013 at 6:07am
Hello,

I'm new on this forum, but I've been renting out paintball supplies for 4 years. I never had problems with my 98 PS Rentals, but I now have the same problem "stuttering" with 8 out of 10 new markers I bought in june 2011.

Can someone please help?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Underst8 Quote  Post ReplyReply Direct Link To This Post Posted: 10 March 2011 at 1:50am
Just seriously getting into paintball and I'm hoping you guys can assist - 

Ever figure this issue out? I just got the same gun (after back-burner wanting a 98 for years since I first played paintball with a m98 in like 1996). Worked fine until i took it apart to clean the internals (amazing how much dust and manufacturing crap was on the towel after, not even having polished...) and then oiled and put back together.

Not exactly the same problem you have - mine will always move both bolts but the rear bolt seems to engage sooner than the front or the act arm/cup are separating and then catching up just after the rear bolt fires. Result is less than consistent velocity and lots of c02 out the end of the barrel.

Took it apart again, cleaned and lightly oiled all parts again according to the manual and it's better but still having the issue sometimes. Obviously theres a chance I've just messed something up since it was OK before I opened it, but I've done my forum research and have lots of experience in building computers and working on/modding cars so I'm familiar with mechanicals, and I think I've covered most of the basic possibilities...but it's my first gun)

Side question - are you supposed to oil the entire outside of the front bolt and the power tube section that the bolt slides on or just a bit on the o-ring?

Thanks in advance.

-98c platinum ACT
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Post Options Post Options   Thanks (0) Thanks(0)   Quote o2x4 Quote  Post ReplyReply Direct Link To This Post Posted: 14 July 2010 at 10:54pm
call tippmann they prob fix over phone, they had me file a sear tripper in a a5 the other day and now it works perfectly
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bluebomb Quote  Post ReplyReply Direct Link To This Post Posted: 13 July 2010 at 6:09pm
Thanks for the response pbnoob, I did check that. I am using the the black pin for the sear and the springs are in the right places.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldpbnoob Quote  Post ReplyReply Direct Link To This Post Posted: 13 July 2010 at 2:15pm
The Sear pin is different color from the rest, so make sure you have the correct one in. Also make sure you did not mix up the sear spring and the trigger spring.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bluebomb Quote  Post ReplyReply Direct Link To This Post Posted: 13 July 2010 at 12:05pm
I've been working on this issue for a few weeks now, and am still having trouble. I have a 98C PS w/ACT that started stuttering. Every trigger pull will result in about three or four cycles of the rear bolt before the sear will catch. I'm not low on air, I've replaced several of the o-rings for good measure, checked my power tube and springs. All of it seems to be in good condition.

I did notice that the sear pin seems to have a lot of play in it. Almost like the pin hole in the receiver halves are wore out. This concerns me a little bit since this 98 has only been in action for about three months. Has anyone else had any issues with this? While at the field I took one of the older 98 customs apart to look at its sear pin and it was held in place very securely. So, I'm guessing this is probably my issue unless anyone else can think of anything.
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