Tuning FX transfer port power adjuster POP sound fix

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qball

qball

Member
Apr 13, 2020
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CA, United States
Few days ago my little 3 month old dream-tac compact developed a pop sound when shooting with Transfer port power wheel is on low, when it happens the TP wheel also has good amount of vibration. 


Called Fx and talked to Chris, he walked me through the process of taking out the TP adjustment assembly which involves taking out 1 Allen screw opposite side of the TP wheel. It was immediately obvious that the 2 Orings were bone dry after I pulled the assembly out. Lathered on some silicon grease on the orings, put it back in and tighten down that 1 Allen screw and BAM(figuratively) quiet as mouse fart again!!!


Both the Dreamline and the crown have the same TP assembly so if anyone experience the pop noise when shooting with TP dial on low then the fix is likely 1 screw and couple dabs of silicon grease! Super impressed with how simple and easy this gun is to work on which shows it is extremely well thought out and superbly engineered! 👍👍👍





edit: Moderator, it appears that this thread should be in the tuning and repair section. Can you please move it? 
 
Hmmmm... 

I just noticed this ‘pop’ sound today on my Royale 400 .22 cal. Thought it was breech O Ring, but when I put a tissue over action and it didn’t move when I shot it, so don’t think that’s it. If that O ring was bad the tissue would blow off. 

I’m thinking it may be the same problem possibly. Might call FX USA as the power wheel assembly may be the same. 

Thanks for the tip. 

 
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Hmmmm... 

I just noticed this ‘pop’ sound today on my Royale 400 .22 cal. Thought it was breech O Ring, but when I put a tissue over action and it didn’t move when I shot it, so don’t think that’s it. If that O ring was bad the tissue would blow off. 

I’m thinking it may be the same problem possibly. Might call FX USA as the power wheel assembly may be the same. 

Thanks for the tip. 
Click to expand...

It's easy.

https://youtu.be/0egdml7RNt8
 
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Thanks guys. 

Watched the video, but I struck out today. Got the spring out of the first set screw, but could not dislodge the ball bearing no matter what I tried. Called and spoke to Chris ( FX USA ) twice and even removed 2nd set screw to hopefully slide out the power adjustment assembly. Chris thought this might dislodge the ball bearing. It ( power wheel) would not budge even with exerting careful pressure with a screw driver trying to create a wedge to help remove. The PW would not come off. In the video, the ball bearing falls right out. Same for the PW, once 2nd set screw is loosened.

NET: I’m not sure what else I can try to remove the PW Assembly per FX instructions. I can always ship to FX USA but I’m going to think about what I might try to dislodge that bearing. I held it upside down, ( with palm of hand directly underneath) and shook the action and that ball bearing is stuck deep in that hole. 

I will get it sorted out, but I’m stymied at the moment. 

Tom 
 
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The assembly is held in place with one screw on the opposite side the action from the power wheel. If it doesn’t move then it could be something else. There should be 2 Allen screws, big one right on top of a very small one, don’t need to touch the small/lower one, it’s there to provide an anchor preventing the whole assembly from rotating. 
 
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Success! Ed - your secret sauce worked.

I used a little WD-40 and sprayed a tiny amount on the ball bearing which was lodged in the hole ( which had been previously stuck ), and gently held the Action upside down and tapped receiver gently with hammer. Didn’t even feel the BB drop into the palm of my hands until I looked - presto, fell right into my palm. 

Next challenge was to remove PW assembly which also was stuck solid. I used a blunt hole punch and from the other side of the action gently tapped the screw/flat round piece of the assembly until I could dislodge and pull it out. Once I got it started I tapped until it fell out. Both O-rings looked good and I applied some grease and reassembled the PW assembly.

With Action out it was time to test fire into my pellet trap. With moderator ( Sumo ) screwed back on, I took three or four shots and extremely quiet. The grease did the trick! 

I feel sorry for any backyard squirrels and into the woods beyond. They will not hear that JSB 18.1 pellet (flying at 875 FPS, PW = 3) coming until it’s too late. The video was very helpful.

Thanks for the help guys!
 
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Great to hear! Btw what grease did you use? Be sure to clean off all wd40 off of everything. Petroleum based products do a number on airgun Orings!! Be sure to use silicon based grease or your orings will disintegrate in no time......ask me how I know.
1f62d.svg
Click to expand...

WD-40 won't harm the O rings. But, it's not an O ring lube (or really any kind of lube), so for O rings in a dynamic application that need lube, certainly other things are better. 

Tom, the secret is the hammer, and if it doesn't work first try, get a bigger hammer! It's about the only tool needed by us sophisticated air riflemen.

Ed
 
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Great to hear! Btw what grease did you use? Be sure to clean off all wd40 off of everything. Petroleum based products do a number on airgun Orings!! Be sure to use silicon based grease or your orings will disintegrate in no time......ask me how I know.
1f62d.svg
Click to expand...

WD-40 won't harm the O rings. But, it's not an O ring lube (or really any kind of lube), so for O rings in a dynamic application that need lube, certainly other things are better. 

Tom, the secret is the hammer, and if it doesn't work first try, get a bigger hammer! It's about the only tool needed by us sophisticated air riflemen.

Ed



Click to expand...

“Get a bigger hammer! “ Ed knows my gun smith skills so well! He’s the brain surgeon and I am the Ortho surgeon, who likes hammers. Funny, I laughed when I read this. 

I did not have any Silicon based O-ring grease, so I may pay for what I used. I had Liquid Wrench Grease and lubed both O-rings with this. Hopefully I didn’t screw it up. 
 
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I believe that is lithium based grease, which should be okay. Dow Corning makes a specific O ring lube, and the smallest container will be more than you'll ever need. Silicone is okay, as long as it isn't in contact with metal-to-metal surfaces under heat or high pressure. I expect many O ring lubes are silicone based, so again, keep it away from metal connections subject to heat or pressure. Most of the O rings subject to high pressure are in static use, and are really fine simply clean and dry.
 
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