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  #1  
Old 01-28-2016, 12:41 PM
unclehenry

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512 Hard To Cock



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Being new to the RFC site I'm looking for advice on a hard cocking 512 non grooved receiver date code IS XXX=12/51the gun is in pristine condition no scratches, dents, rust, cracking it's just beautiful.

After I got it home I took the bolt out and cleaned the lower action parts with brake clean and compressed air as it had lots of old sticky dried oil in the lower action, the brake clean came out brown and then I oiled the action parts. I then proceeded to disassemble the bolt and clean and oil it lightly.

My question is "Why is it so hard to lift the bolt handle to the cocking position?"
The bolt moves freely in the eject position and operates as it should. Is there a fix for this problem? Can I install a lighter main spring? Any suggestions would be greatly appreciated....Thanks In Advance...UNCLEHENRY
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  #2  
Old 01-28-2016, 01:26 PM
tomon is online now
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Remove the bolt.......

and hold the front of the bolt body in a padded vise or padded channellocks. See if you can cock and decock it easier. That should tell if it's confined to the bolt, or being caused by the trigger group, bolt guides, safety, or receiver.
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  #3  
Old 01-28-2016, 02:09 PM
unclehenry

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512 cocking

It is still hard to cock even in the padded vice...
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  #4  
Old 01-28-2016, 02:22 PM
unclehenry

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512 cocking

Are these rifles notoriously stiff to get into the cocked position? Seems like a lighter main spring might do the trick,,,, but how would a lighter spring affect the firing pin?
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  #5  
Old 01-28-2016, 02:32 PM
scooter22 is online now
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Was it hard to cock before you cleaned it? Do you have another(s) to compare it to? Maybe you need a little more oil or to add a dab of grease to the camming surface. What I'm getting at is maybe thats just the way the 512 is.
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  #6  
Old 01-28-2016, 02:48 PM
ez_lle71
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What are you comparing it too as far as another rifle? The force it takes to cock the rifle?
ez
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  #7  
Old 01-28-2016, 02:58 PM
Bobin Maine
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Buy another spring and cut one coil at a time until still fires and feels good.
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  #8  
Old 01-28-2016, 03:04 PM
HUSHKABOOM
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Check the pin that holds the rear beehive section onto the main bolt body. If it sticks out just a little on one side it will bind in the action.
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  #9  
Old 01-28-2016, 03:09 PM
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try cleaning + lubricating locking lug recesses in receiver + cam surfaces + pins in the bolt before replacing main spring - i have seen them get weak with age , never stronger - also spring + firing pin could be gunked up with dried up oil or grease try flushing it out with kroil or something similar - let us know -
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  #10  
Old 01-28-2016, 03:14 PM
unclehenry

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512 cocking

I took the bolt out, disassembled it then put it back together with out the main spring installed...then lifted the bolt handle up and down it seems to have points of resistance as the bolt handle pushes against the cam pin...I will try a small layer of grease....Thanks
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  #11  
Old 01-28-2016, 03:21 PM
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also check for burrs or roughness on bolt lugs , cam surfaces + receiver locking lug surfaces -
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  #12  
Old 01-28-2016, 03:24 PM
J1973s

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512 - Hard to cock

Just my experience. In my bolt action 22 collection, I have the following:
1)Springfield/Stevens Mod 53 single shot
2)Winchester 75 Sporter clip
3)Winchester 75 Sporter clip
4)Winchester 75 Target
5)Remington 582 tube feed
6)Remington 511 clip

#1-5 all cock very easily. #6, the 511 is much harder to cock. Small world that it is went to the range this morning with a friend. He brought a 511 and (I think) a 513, it said Matchmaster.
FWIW, his 511 also seemed to cock hard. I would think that the 510,511 and 512 would have the same bolt. Possibly the 511's are harder to cock. Definitely my experience from my small sample.
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  #13  
Old 01-28-2016, 03:52 PM
gwc1584
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My 510 has a tight fit. You want a solid lock-up with the bolt. Little to no movement of the bolt when you fire the rifle. It keep any excess gas from venting around the bolt face and into your face.
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  #14  
Old 01-28-2016, 09:49 PM
ghart

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Nice looking rifle. I bought a 1942 512 this summer however have no problems with the bolt. It does shoot high though so I bought a taller front sight but haven't change it yet.
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  #15  
Old 01-28-2016, 10:04 PM
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I have and had several 510, 511, 512, 513 & 521 rifles. Sometimes the bolt is just poorly finished and taking it apart and stoning and polishing the moving parts will take care of is not the your problem. A lighter main spring is not the solution.
John
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