(Problem Solved) FX Wildcat won't cock

I was replacing the pressure gauge on my .25 wildcat today since the factory one was off about 12 bar and AOA offered to send me one for free. The problem I'm having now is that the rifle won't cock. All I did for the disassembly of the gun was let out the air by following Ernest Rowe's suggestion of compressing the valve stem, then I unscrewed the gauge and put a new one on. I don't understand how that affected anything internally. I have called AOA to talk to a technician, but I had to leave a voicemail and they have not yet called me back. I am hoping on of you know what I'm doing wrong so that we can prevent anyone else from having this problem. 
 
Generally not recommended to dry fire a pcp with no air pressure in it. On some rifles the lack of pressure on the valve can cause the valve to open too much thus bottoming out the valve when the hammer strikes it. If you have a paintball store or scuba shop nearby they could get it filled for you initially. As for the rifle not staying cocked......that has to be a trigger adjustment. Isnt there a linkage rod from the trigger to the trigger sear? Maybe you bumped this linkage? Either way....adjust your trigger so the sear engages when you cock the rifle....trigger should be heavy at first. Once its staying cocked.....then you can start adjusting back down/lighter to where you want it.
 
Mark, don't think I quite understand. You dumped the air, changed gauges then did you get it aired up, and then it won't cock? Or you can't get it aired up? On my wildcat on a vary rare occasion it won't cock. Be careful, it's easy to double load when that happens. Take out your mag and make sure the gun is cleared. Then pull the cocking lever all the way back, hold it and pull the trigger. You may have to work the trigger and cocking lever a bit and you will feel it catch. Happened maybe a couple times in 17K shots on mine. Have no idea why. Maybe as marksman says. Trigger just needs adjusted. After it caught everything was fine again. If you can't get it aired up, I have no idea. Good luck. 
 
Dartagnan That is exactly what happened. I didn't have a wrench narrow enough to fit the gauge (it's 4mm thick if you're wondering) so I was going to try and remove the air cylinder to take it to Lowes in order to find an 11mm wrench small enough. Well to begin with that air cylinder is stuck on there so it wouldn't come off, and it forgot to retighten the frame assembly. I called AOA and they had no idea. 

Side note: AOA was going to make me pay $32.50 each way for shipping as well as parts and labor to fix the gun. The gun is 1 year 6 days old so it's "out of warranty". The guy did say he would be able to work with me depending on if it was something simple or similar, but still. I'm glad I didn't have to send it to them because it looks like it'd probably be at least $100. I don't know if you have to pay for shipping if it is in warranty, but I would most certainly hope not. If that is the case than I'm very disappointed in FX. At least AOA sent me a new pressure gauge for free and so far it looks to be much closer to the real pressure.
 
Sometimes we get into our airgun projects and get to a point in our project, we forget the initial steps we took before we get into a bind. Hek, I started to fill my Mauder when air started gushing out the bottom of the stock. I tilted the gun to it's side and dang it! I did forget to put the pressure gauge block back in. I must have been replacing all the orings at the time. Anyway, glad you got your CAT back. 
 
I looked high and low for a 11 mm (7/16) for a wrench thin enough to fit in that very slim space the gauge nut occupies. I have all kinds at home but all were to thick. I bought thinner ones at the auto store. Nope, too thick. Then I went through a drawer where I had been keeping those cheap, think wrenches that come with toys and certain furniture when you buy them and have to put together. I found one that was think enough but a 1/16" or less to small of a box to fit over the nut. I used a file and made the box just wide enough to fit the bolt. That bolt now has marker on it: "FX Wildcat Gauge".

I had to replace the original gauge because the cover kept falling off. But, I think I caused that problem by putting the fill cap on upside down when I was trying to understand how the fill probe works (very tight fit). 

AOA was great. Of course my rifle was only days old.

I did have to send a 1 year old Regal back to Daystate. They sent a shipping sticker so I could send it back for free. They fixed the regal leak (very tiny but near the air tube connection) without charge but I did have to pay the $32.50 for return shipping. 
 
"Dartagnan"You probably twisted the frame assembly when you were working on the gauge. Loosen these bolts and make sure all is aligned properly. Be careful, once you loosen these bolts the frame will move easily.

As I was making adjusting to my trigger's first and second stage, the frame must have gotten misaligned, not sure how. My wildcat then would not cock.

Thanks for this tip, would have never guessed the frame assembly moving could cause it to not cock. I loosened the four bolts and had to move the frame back a mm at a time. Re-tighten bolts and check for sear engagement. Also noticed that proper frame alignment had noticeable affects on how smooth the cocking action was.