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Old 10-09-2013, 05:22 PM   #1 (permalink)
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Autococker - what did I do?

I've worked on autocockers since 1998 and am finally stumped. The velocity on my current pump build will not increase or decrease...it just makes a faint noise when gassed up and trigger pulled. The velocity has steadily dropped off the point that the marker won't push a ball down the barrel. I've checked the following:

Bolt is in the correct position
Double check bolt...
Checked the air source for adequate pressure
Adjusted the ivg so it's just past flush
Adjusted the ivg inward to increase velocity...nothng
Checked the hammer spring to see if its to light
Bypassed the mini-reg to see if the mini-reg is bad by screwing tank into the ASA
Checked the on/off to see if its choking the system
Checked the macroline fittings to see if the system is being choked off
Checked the hammer to see if it was hitting the valve...looks ok

The last item I haven't checked, I believe, is the valve since I'm currently without a valve tool. After going thru the list my guess is that the valve has some crud in it and is preventing the valve stem from traveling far enough.

Is there something I could be missing? I really thought it was the mini-reg, but after putting a tank directly to the marker and getting the same result, I can rule that put.

Thanks for any suggestions and help!
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Old 10-09-2013, 05:31 PM   #2 (permalink)
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Just a thought...could it be the tank?
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Old 10-09-2013, 05:42 PM   #3 (permalink)
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This a 2k+ cocker? Could be the reg isn't working and it's going to full pressure. I'd start by checking the output pressure on the reg (or use another known good operating in the 200-400 psi range).
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Old 10-09-2013, 05:44 PM   #4 (permalink)
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I agree with MaD. Sounds like too much pressure.
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Old 10-09-2013, 06:09 PM   #5 (permalink)
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That's kinda what I'm leaning towards since no matter where I set the mini-reg I get the same results. I get similar results when screwing a tank directly to the marker without the reg. I've got a CP reg coming to me in the mail tomorrow. I hope that's the problem since nothing else seems to remedy the issue.

I'd open up the mini-reg, but I don't have a good way to remove the c-clip without damaging it. Not that would do any good since I don't have the necessary Irving's or piston rebuild it.

After all of the dockers I've owned I've never had one with a bad main reg...assuming that's the problem.
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Old 10-09-2013, 09:01 PM   #6 (permalink)
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I third too much pressure. I have seen the same symptoms your describing caused by the owner of the cocker replacing the HPR with a gas thru grip.
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Old 10-10-2013, 02:31 PM   #7 (permalink)
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put your thumb on the cocking knob and press down on it hard when you fire. If there is a huge difference you are over pressurizing it as said above. If there is no difference take the ivg off and make sure nothing is blocking in either end of the ivg. Then yea I would check the valve but that would be strange.

Another possible way to check if the mini reg is regulating pressure without using a gauge would be to gas the marker up without cocking it first, if its a 2k model with a lower pressure valve it should vent air unless its receiving the high tank pressure, or the valve spring is way to heavy.

I'm also pretty sure its just an over pressure situation
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Old 10-10-2013, 06:04 PM   #8 (permalink)
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Bad mini-reg. I installed a CP reg and it works fine. Anyone know where I can get new internals for a mini-reg? I'm guessing the piston is messed up...or it could be filled with crud and needs a good cleaning.
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