Umarex Notos cocking got gritty

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Strange thing happened yesterday went to shoot the notos and noticed when trying to cock 1/2 way through the cycle it started feeling gritty
Found some pellet debris
But still little gritty
Cleaned up did some polishing
what I notice is from the tension from the hammer spring when cooking causes that bolt to slightly cock and drag on the top and bottom
No galling anywhere strange it was fine couple days later and this
Anyone else run into this issue ?

20240930_175553.jpg
 
well, found another issue with this
if you look in the picture above that little pin in the cocking lever works its way up and skins the screw holes i found.
needless to say, a small peen took care of that
i also used high pressure black moly grease and skimmed the bolt n bore
now it's back and smooth as butter real smooth, that silicone grease it don't work for this to well but the 5% moly sure does.
 
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I started having the same issue.. My cocking was never smooth, but it would always cock.. now it gets to the point where it just wont budge.

I took out the hammer spring and noticed there was some burring on the mushroom part that the hammer spring seats in. I initially thought it was that part as I could feel some wear where that slides. And maybe it does add some resistance. But I don't think the main cause.

After some more testing, it is the cocking lever... I can slide it 50 times and it will be so smooth, but than all the sudden it starts to bind. Sometimes when held vertically it will unbind, but not always.. Once I assemble the hammer spring, it will 100% bind, it seems to be the way it puts pressure. I didn't want to have to take the cocking lever assembly out...

Any suggestions


Here is a short video of it binding.. then being good, then binding really badly.

20250307_173321.jpg
 
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"when trying to cock 1/2 way through the cycle it started feeling gritty"
"that little pin in the cocking lever works its way up and skins the screw holes"
"now it gets to the point where it just wont budge"

All of the above happened to me. Friday evening was out shooting and the gritty cocking finally seized and it will no longer cock.

What did you guys do to resolve this? I've contacted seller I purchased from, but it's been a minute so I don't expect they will / can do anything. I've also contacted Umarex about it. If they don't do anything, I will NOT recommend this air rifle to anyone in the future as several of us have had this issue and given I've only had the thing a little over 2 months, it hasn't been resolved.

Please comment if you resolved the issue and how you did it. Thanks
 
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iFish said:
"when trying to cock 1/2 way through the cycle it started feeling gritty"
"that little pin in the cocking lever works its way up and skins the screw holes"
"now it gets to the point where it just wont budge"

All of the above happened to me. Friday evening was out shooting and the gritty cocking finally seized and it will no longer cock.

What did you guys do to resolve this? I've contacted seller I purchased from, but it's been a minute so I don't expect they will / can do anything. I've also contacted Umarex about it. If they don't do anything, I will NOT recommend this air rifle to anyone in the future as several of us have had this issue and given I've only had the thing a little over 2 months, it hasn't been resolved.

Please comment if you resolved the issue and how you did it. Thanks
Click to expand...

I ended up tearing the gun down. I have less than 1 tin of pellets fired. Cleaned everything up, lubed it... My pins were all seated, but also easily came out, but with the gun apart the firing pin still seizes and I can see its not the pin... There was some slop in the pivot on the cocking lever that I thought may have been the issue, as without the hammer spring in, the firing pin would bind, and if I applied pressure it would release and slide.

I could reassemble, cock 5 maybe 10 times fine, then it would lock up.. I can't 100% see the issue. My guess is its torquing it self and wearing the metal, creating a burr and jamming it. I could feel burrs on the hammer spring bushing and inside where it seats it looks worn. But it binds without the hammer bushing in, so it may also be where the cocking pin slides is worn and now torquing it self up and binding.. hard to explain but if you took it apart you would understand. I just don't see obvious wear on the firing pin, and its hard to see into the channel the firing pin slides..

Waiting on some moly paste, but it may be too late, the lube they recommend is not enough to prevent premature wear. Will call umerex monday.
 
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I changed my mind on what is binding.. Looking over it again, its the front shaft of the firing pin, binding on the front silver bushing. The cause? hard to pin point.. There is a bit of tolerance as the pin slides through, and that bushing also has play, can rock left and right. I think its just a combination of too much slop, and towards the end of travel the pin is no longer staying centered, and the bushing is shifting, and it just locks it all up..

the movement always had resistance, so something wore or slightly bent under normal use, making an already problematic issue, worse

Waiting on moly paste. will see about polishing that firing pin shaft, and that bushing
 
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Tim23 said:
I changed my mind on what is binding.. Looking over it again, its the front shaft of the firing pin, binding on the front silver bushing. The cause? hard to pin point.. There is a bit of tolerance as the pin slides through, and that bushing also has play, can rock left and right. I think its just a combination of too much slop, and towards the end of travel the pin is no longer staying centered, and the bushing is shifting, and it just locks it all up..

the movement always had resistance, so something wore or slightly bent under normal use, making an already problematic issue, worse

Waiting on moly paste. will see about polishing that firing pin shaft, and that bushing
Click to expand...

I agree it's not the hammer or spring. Mine jams even when that is removed. It may have to do with the pins they use to hold the lever to the firing pin (I assume the rod that pushes the pellet into the breach is called the firing pin). they seem to scrape the frame internally. I can see the gouge marks in the housing when I move the cocking lever back and forth. It's a mess in there. I put reel grease on the hammer and it didn't help at all. Putting grease on the firing pin won't help either if what is happening is what I suspect it is.

Very disappointed in this air rifle, even if it is on the cheaper side, if you can call $270 cheap. I sure don't.
 
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iFish said:
I agree it's not the hammer or spring. Mine jams even when that is removed. It may have to do with the pins they use to hold the lever to the firing pin (I assume the rod that pushes the pellet into the breach is called the firing pin). they seem to scrape the frame internally. I can see the gouge marks in the housing when I move the cocking lever back and forth. It's a mess in there. I put reel grease on the hammer and it didn't help at all. Putting grease on the firing pin won't help either if what is happening is what I suspect it is.

Very disappointed in this air rifle, even if it is on the cheaper side, if you can call $270 cheap. I sure don't.
Click to expand...


Agree 100% (I was calling it the firing pin too, no idea the real term) ... If I manipulate the arms on the firing pin, it sometimes will free up the movement as long as the hammer spring is not installed,.. too much slop in those levers arms, they slightly twist at the pin.. once back together, just too many forces, and really bad tolerances.... I see scratching along the front of the firing pin that goes through the bushing, and wear inside the chamber.. less than 1 tin of pellets fired.


I put up with the other issues of this gun, as it was good for my purposes, but with this issue, I'd say it's a hard pass on the recommendation.
 
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Just another note, there is a bolt that screws into what we're calling the firing pin. If you place an allen key into that bolt, push down and attempt to slide the cocking lever, it will slide smoothly back and forth. At least mind does. Remove the pressure and it jams instantly again. I tried to back that allen screw out a bit as it hits the hammer, hoping it would put enough pressure on the firing pin to allow it to move freely. Didn't work at all.
 
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This is one of many points that it binding.. I can take it apart knock down the burrs, assemble.. get 3-5 smooth cocks, starts to get gritty.. By 10 its locked up

I took the front bushing out, and just sliding the firing pin can start to get gritty at the back of the action.. but doesn't lock up

on top off all that.

the firing pin is not straight.. maybe off from new, or maybe slightly bent over time.. when chucked in the drill press, there is a good wobble... as the front shaft is passing through the bushing, its forcing the back where the lever attaches into the frame. As this happens I can see the front bushing is no longer flush and trying to twist.

Then add the hammer spring bushing and that also drags on the spot I circled in the picture.. all just leading to not being able to cock it.

20250309_141033.jpg
 
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