When I shoot my 850 now the rotary clip stops in the middle of the spin,by applying a little thumb pressure it will spin on into position,I'm wondering if this is just a worn out clip or if something internally is worn in the the action. Any comments are appreciated.I'm still shooting it though,today the heat index here is 102degrees and the chrony is showing 733 with co2,not bad,and accurate as you would want.I don't want to replace it since I might not get one as accurate,this thing hardly ever misses.I may have 20,000 or so pellets through it ,it may be worn.The little goodie that grabs the clip to spin it does not look worn to me.The aluminum center of the clip that it contacts however does.
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20.000 Wow... I've heard of FX Tarantulas blowing valves after 15.000 rounds. This is great news. I agree with Rich try some new mags, they are cheap here:
Co2 is working so well in this hot weather I'm using it and saving my air.I think it is the clips ,PA has them for 12.99.Darn I just got in 6,000 pellets the other day and I could have included it in that order,I won't make an order that small,I'll have to wait and order something else with it.I got in on that 15% Fathers day discount.That worked out pretty well for me.
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Roald and I had talked about and messed with my .177 several times. One of the early issues was a bent bolt probe...which both Roald and I had straightened more than once on my gun. This was obviously caused by my ham fisted frustration of a not so smooth cycling of pellets out of the mag. After some more discussions I finally took my gun down to Roald's house and we tore it apart one more time we also had another 850 that was in good working order side by side we looked at everything inside and out that we could and finally decided that part# 465.20.13.0 was a little looser fitting than the good working gun's. So we replaced it and things have been good ever since. When we took the action housing off and cycled the bolt plate back and forth we noticed that the little bird beak thing wasnt getting actuated as soon as it should have been. The bad part was that the amount of movement was so slight that if you dont have a good working gun side by side you wouldnt notice it. Basically if you look inside and move that lever that moves the little bird beak, when the lever is slid forward that bird beak should move instantly when that lever moves.... no pause. If there is a pause then the mag does not cycle all the way and ends up binding the bolt forcing you to use some finger action on the mag to get the bolt through and the pellet chambered. Anywho you might investigate part #'s 465.20.13.0 and 465.20.14.0 and 308.20.07.3 the pin that the lever pivots on and make sure that when the lever is moved that the bird beak moves simultaneously with it. I cant remember what the price was of the parts but they werent too bad. So you might wanna give Ryan or Glen a call at Umarex and see if you can get em. Hope this might help.
you described exactly what is happening when I cycle the bolt and there is a pause before the birds eye thing starts moving,then it binds and needs a little help to get going.I'll have to look into some replacement part,thanks for that informative post.
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So the new magazines (clips) didn't cure the problem ..
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July 3 2009, 8:46 PM
John beat me to a reply with some good ideas, especially the part about the 'bird beak' but maybe we can narrow down the focus some more.
I don't have the experience Roald has but I have fought many battles regarding the feeding of these in both 22 and 177 caliber so maybe I can help if you are able to troubleshoot and answer some questions.
#1.. First of all, what caliber is it? The 22 seems more prone to feeding issues due to pellet size. Also, when did this start happening. Has it always been there or was it noticed after some event like a pellet jam?
#2.. Assuming the gun is charged with C02, load clip with pellets and pay close attention to the front of the pellet (round nose preferred) -- we want the nose to be smooth with no marring. Now, load the clip and cycle the clip. If it didn't stop, shoot and cycle the next chamber. Do this until it stops then instead of using the thumb to move the clip, push harder on the bolt to impress an indentation into the pellet assuming it is not centered and jamming against the breech of the barrel. Now -- don't shoot the pellet but unload the clip making sure you can identify the pellet. Inspect the nose carefully and look for damage from applying pressure to the bolt when it stopped. Look into the cavity where the probe makes contact and see if you can tell where the probe hit the pellet. This is more applicable to a pellet like CP's that don't have the conical shape. Keep in mind the possibility that a cone shaped skirt 'may' have some impact on how the pellet exits the clip, as well as a probe hitting a flat shaped skirt. Do this several times to see if a pattern forms. If the pellet has indentations then it is getting jammed against the breech of the barrel and stopping short. If there is no indentations, I will be surprised but we can look at the next step anyway.
#3.. 'Remove the clip' and cycle the bolt slowly while carefully watching how the bolt enters the barrel breech. Assuming you are close enough that you can tell, do this multiple times and try different methods of closing the bolt. Apply pressure downward on the bolt handle, then reverse it upwards. Try appling pressure on the back of the bolt (the part that exits out the rear) both up and down, left and right. Again, look for repeatable patterns.
#4.. Look very closely at the bolt and probe to see if they are straight or bent. The 177 is easily bent while the 22 is more robust - but it can be bent as well.
#5.. Now with an empty clip inserted and locked in place but with the bolt drawn back -- see if there is slop in how it fits the axle is centers on. If slop exists, it can shift the clip location. The orings often play a part in this as well. Now slowly push the bolt forward while looking at a side view and notice how the orings interact with the clip position. If you have a light in the background, you can tell if the probe oring affect the clip oring and shifts the clip one way or another.
Although there are many suspects in feeding issues, the two most likely suspects are the bolt/probe being bent, and the barrel breech having a fairly narrow cone entrance -- both are fixable. With the rounds you have through the gun, it could be possible that parts like the clip centering axle are worn enough to cause issues as well.
Last question -- how handy are you. Do you feel comfortable inside the action and and doing your own fixes?
This message has been edited by gordonid on Jul 3, 2009 8:47 PM
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My problem seems to start before the probe gets close enough to push the pellet,with a little help from the thumb it spins on into place and doesn't seem to bind while pushing the pellet into place.However I will look for a bent probe but I think mine is ok in this case.
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