C9A won't fire, und...
 

C9A won't fire, under pressure??  

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ScottMn
(@scottmn)
Joined: 2 years ago
Posts: 13
2018-08-01 07:42:55  

I have a C9A that won't fire but yet there seems to be pressure in the gun because there is a fair amount of resistance when pumping. I would like to take it apart but don't want to have anything "launch" when disassembling the gun. Any Advice?

I would also like to replace all the seals etc... Can anyone recommend a complete kit?

 

Thanks


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DanD
 DanD
(@dand)
Joined: 2 years ago
Posts: 22
2018-08-01 09:21:26  

Hello,

It does sound like your gun is over-pumped, and the hammer cannot overcome the pressure in the valve.

The exhaust valve works just like a valve on a tire- when you push the valve stem in, it releases air. You can take the breech end cap off, and hammer assembly out to get to the exhaust valve stem. Use large punch or dowel to reach into the tube to the end of the stem, then tap it with a light hammer to let the air out. Be sure the barrel is pointed into a backstop in case there is a pellet in the chamber. Don't worry, the valve should not go flying, but hammer spring pressure will push the breech cap outward, so just give some opposing pressure with your hand as you loosen the breech cap screws.

If you have a C9A with the stamped trigger blade, you'll need to take off the two brass parts that hold the trigger return and safety mechanism to get to a little screw that holds the bottom of the cap in. Watch for the little detent ball bearing between the action and the safety tab. Then remove the two screws on the sides of the cap, and the cap, hammer spring, and hammer will slide out, revealing the valve stem. Be sure the bolt is in the close position so it doesn't interfere with the hammer movement.

If you have the die-cast trigger pack, the breech cap is part of the trigger assembly, and you'll need to remove the two side screws and loosen the front nut to slide the assembly out.

If your gun is overpumped, the valve is probably sealing fine. If you want to reseal it, if it's the soldered valve version of the C9A, you'll need a special tool sold by Pyramyd, JGAirguns, etc to take the valve apart. Some C9As have the modern cartridge valve, which are easier to work on.

Good luck, and have fun!


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ScottMn
(@scottmn)
Joined: 2 years ago
Posts: 13
2018-08-01 09:23:42  

OK, I grew a pair........released the pressure by leaning on a wood dowel inserted in the rear of the cylinder. Here's what I found.....

IMG 7226
IMG 7230

I gather that the brass valve assembly is better than an aluminum one. There is also a valve in the "tube" that can be replaced but you need a special tool to replace it? The hammer spring appears to be bent and I believe I've seen some kind of end or guide for the end of the spring that isn't in my gun?

I did reassemble it and it will fire up to four pumps and then will stop. Could it be that all I need is a new hammer spring and guide/end/cap so the hammer will strike the valve hard enough to release the pressure?

Thanks for any advice.

 

 


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DanD
 DanD
(@dand)
Joined: 2 years ago
Posts: 22
2018-08-01 09:38:59  

Good job! You have the newer cartridge valve, so no worries about special tools. The solder valve in the tube is an older variant. 

It looks like someone put a very light hammer spring in your gun. I think you're right that a new hammer spring (and guide if applicable) will fix the issue. You can find the parts diagram on the Crosman website support area and call Crosman customer service with the part numbers you need. Crosman parts are very affordable.

Have fun!


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ScottMn
(@scottmn)
Joined: 2 years ago
Posts: 13
2018-08-01 10:12:16  

Thanks Dan, By solder valve in the tube do you mean the valve that is in between the piston and the valve body? There is a valve there and no pin or visi means of holding it that I can see. I assume that is the valve I need the special tool for?

This is a Frankenstein gun put together by Gary at B&B Supply in Minneapolis years ago for my son. It was his first gun but stopped working a few years ago. He just went into the Marines and I thought I would get it working again for old times sake.  Gary had purchased a bunch of the brass actions and was putting them together for people so it's probably a mix of parts??? Gary passed away a couple of years ago otherwise it would be back with him right now.

I'll check out crosmans site.  Thanks


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ScottMn
(@scottmn)
Joined: 2 years ago
Posts: 13
2018-08-01 11:13:22  

OK, I'm a moron. There's nothing between the piston cup and the end of the valve body. A little light always helps. 😬 


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marflow
(@marflow)
Joined: 2 years ago
Posts: 643
2018-08-01 17:40:57  

did Gary pass away or was it has wife, I thought at the time of the first post I saw someone for Gary corrected the story but have never found out the facts------Gary is a first class guy in any case

Mike


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ScottMn
(@scottmn)
Joined: 2 years ago
Posts: 13
2018-08-02 08:39:53  

Just ordered two of all the internal washers, orings, screws, and springs for $35.00 shipped. Forgot a couple of screws and they weren't able to add on to the order but got them out with no shipping charge. Not bad at all.  Thanks again


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