GTA
Airguns by Make and Model => Daisy Airguns => Topic started by: lognom on May 06, 2021, 12:52:19 PM
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Hi,
I own an Daisy CMP 853 that's won't charge with air. When I first pump it I can hear air rushing from the barrel. When I pump it again, the air from the barrel will stop and the gun will charge, but not with full power. This problem began out of the blue. One day I was shooting fine and then more or less suddenly the large power drop-off happened. I've learned a huge amount about this gun by reading this forum, including how to repair it, but this time, nothing I've done works.
I've replaced the two o-rings, valve, and felt washer and I've the oiled the pump plunger seal and washer. What other parts do you think I should look at that could explain this? Would replacing the trigger housing make any difference? Mine doesn't show any cracks. Also, I noticed in Tom Johnson's Sporter Tips, that some of you have seen, he mentions an airplug in the bottom of the trigger housing, without which the gun won't charge. Before I looked at this, I never even knew there was such a part and I see no such plug in my rifle. Could that falling out explain the gun not holding sufficient air.
Since buying this rifle I've since moved on to fancier guns like the Daisy 599, but I still love this one. I guess I could buy a replacement from CMP, but I'd rather fix this one.
Thanks,
Lloyd
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following with great interest
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"air rushing from the barrel."
This indicates to me that the valve is not closing.
Maybe a bad valve, valve not installed properly, oil in the valve (from too much oil in the compression chamber), the hammer is holding the valve open, or . . .
As I recall, the procedure is to first cock the hammer, put on the safety, then charge the air.
Cocking the hammer releases pressure on the valve, so the valve can close.
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ac12,
Thanks for your reply. However, I already wiped out the valve body with a q tip and replaced the valve. I also examined the valve with a magnifying glass to make sure there weren't imperfections in it. I should've mentioned that the air rushes from the barrel when I cock the gun, before I fire. it. But I also replaced the piston seal and felt washer and oiled them. I guess there might be a difference between the two o-rings (valve body and piston) and I should go back and reverse them in case that helps.
Are you familiar with the airplug that Col. Tom Johnson refers to in his instructions? He says the gun won't charge without it. I don't see any plug in my trigger housing although I do see a hole where a plug might go. This part isn't mentioned on the Daisy 853 parts schematic. I've been shooting this gun since 2014 and wasn't even aware of it until this issue began and I poured through all my repair instructions.
Lloyd
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quote
I should've mentioned that the air rushes from the barrel when I cock the gun, before I fire it.
I am interpreting this as: you charged the gun with air, before cocking the striker.
If so, the uncocked striker could be holding the valve open.
Try the reverse.
Cock the gun (to get the striker off the valve, and let the value seat and seal), press the safety ON, then charge it.
Note on the x53 rifle SSP guns, the two actions CHARGING and COCKING are sometimes mixed up.
- CHARGING the gun with air, with the lower charging handle.
- COCKING the gun/striker, by pulling the bolt back.
Don't shotgun the problem.
You have to look at the problem in sections and systematically.
#1 WHEN does the air leak happen.
Does the air leak when you charge the rifle, or when you cock the rifle? See above about charging and cocking.
- You should be cocking the rifle on an uncharged gun, so there should not be any air pressure to leak. If you have air leaking when you cock the rifle, you charged the gun before cocking.
- If the air is leaking during charge, is the striker cocked (unloading the valve, to let the valve seat)?
#2 WHERE is the leak. You said "air rushes from the barrel"
If it is from the barrel, then you have an air leak through (or around) the valve, because the valve is supposed to hold the air in the compression chamber.
If you have a cracked receiver, the air would be leaking out in the receiver.
I discount leaking past the piston seal, because of you said the air "rushes from the barrel."
No idea about that air plug that you mention.
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ac12,
Your advice fixed it. Though I'd been shooting the rifle for over five years, I didn't know that cocking affected the valve. Now that I'm making sure to cock before charging, the air isn't leaving the barrel when I charge and I once again have sufficient velocity.
I've learned a lot about my 853 from reading your comments over the years.
Lloyd
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Yes, the two part process of cock and charge is different from a spring rifle where there is only one action to cock the gun.
The neat thing about this is, you can dry fire the gun, without expelling air, simply by just cocking the striker.
I did this a LOT on my Daisy 747 SSP pistol, when I was working on trigger control.
It depends on how hard the striker hit the valve and if it held the valve open.
Or if the valve spring was able to close the valve against the pressure of the striker spring.
It's been a long time since I've been inside the receiver of my x53 rifles.
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Cool thread and thank you AC12!
Occasionally I do not cock before charging (actuating cocking lever) and this might explain any changes in POI
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I dread opening up the receiver. It's kind of a pain to do, so I only do it when parts have to be replaced.
Yes, I love guns that can be dry fired without using air.
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I dread opening up the receiver. It's kind of a pain to do, so I only do it when parts have to be replaced.
Yes, I love guns that can be dry fired without using air.
Speaking of opening the receiver;
I need to replace the cocking (bolt)handle on my 853
And I do have a parts diagram.
Any advice or hints?
Are there any useful videos about the task?
Thanks
Ed
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I dread opening up the receiver. It's kind of a pain to do, so I only do it when parts have to be replaced.
Yes, I love guns that can be dry fired without using air.
Speaking of opening the receiver;
I need to replace the cocking (bolt)handle on my 853
And I do have a parts diagram.
Any advice or hints?
Are there any useful videos about the task?
Thanks
Ed
It's not that bad of a job.
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Silent Squirrel,
There is a YT video as well as written instructions on the the Pilkguns website. Daisy also has instructions floating around the web.
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Silent Squirrel,
There is a YT video as well as written instructions on the the Pilkguns website. Daisy also has instructions floating around the web.
Thanks lognom
Lots of good info on the Pilkington site.
Ed