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Thread: MG34 bolt problems

  1. #1
    Join Date
    May 2007
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    Question MG34 bolt problems

    I have a MG34 semi on a TNW receiver and when I charge the gun the bolt slides real rough and is hard to pull back and sometimes sticks. After a few pulls the bolt makes a click sound and gets stuck and the charging handle pulls free of the bolt and wont grab It again. I have to take the butt stock off and force the bolt out of the receiver. there is a rod on the top of the bolt that I assume is the ejector. It slides through the top of the bolt into the face of the bolt at an angle. Is this supposed to have any spring tension? this one has no spring tension on It and slides back and fourth freely. Where It comes through the top of the bolt Its all buggered up and I think thats whats hitting the receiver and causing this problem. When I re install the bolt I have to push this "ejector" forward with my finger so It protrudes at its furthest point through the face of the bolt to get It to slide in the receiver. HEEEEElp me with my new toy please!!
    I think its because I wasn't cuddled enough as a child.

  2. #2
    Thats the ejector you're decribing, the plunger you have to push forward to get the bolt in. I have to do the same to get my bolt past the ejector plate. The only 2 ejectors I've ever seen were pretty beat but worked ok. These rifles need lubed well. TNW recommends TW 25 or something like that. I've seen it on Brownells websight or TNW will sell you some. If you feel lube is not an issue, open the top cover, pull off the feed tray, take a piece of wood and lay crossways in front of the protrusion on the bolt carrier that works the belt feed mechanism and see if you can pull the bolt back easily. Do not use the charging handle, leave it in the forward position. If it's hard to pull back, or feels like it's dragging, check the rivits that hold the cam plates to the reciever. Make sure the rollers on the bolt are there and turn freely. If it pulls back and goes forward with no noticable drag, the problem is probably wear on the pin that's attached to the charging handle. If this is worn or bent just a little bit, it will cause what you posted to happen. There are 2 things that the charging handle does. The most obvious is it pulls the bolt back. If the pin is worn it can act like a cam and shove the bolt to the side and cause it to bind. The other thing it does is harder to see and understand. On the bottom of the barrel shroud, right next to the pin that you push to remove the shroud from the reciever, is a sping loaded tab that looks like its only reason for being is to keep the charging handle locked forward during firing. This tab goes through the reciever and locks the bolt in place too. Take the bolt out, put the charging handle all the way forward until it engages the tab and you can see the bolt lock move. If the pin that pulls the bolt back is worn, it throws the timing off on that locking tab and makes it a bear to pull back. Good luck on your new toy.

  3. #3
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    The pin on the charging handle is pretty beat up looking I think from this problem. When I put the charging handle locked in the forward position and use a piece of wood to pull the bolt back Its hard to do and the bolt itself seems to not want to twist and move and It seems to "half lock" between being cocked and not cocked. Everything is well lubed with lithium grease right now and I dont see anything interfering with the rollers on the bolt. I tried to find a tutorial on taking the bolt apart but I cant find one. Ive gotten as far as twisting the bolt to disengage the fireing pin but on the back of the bolt It doesn't look like any other bolts Ive found in pictures so I cant figure out how to take It apart. Even when I pull the bolt back as far as it will go with the wood and let It slam forward Its still in that half cocked mode and sometimes I can bang It forward with the wood and sometimes Its just stuck. This really sucks! I paid a crapload of money for this thing.
    I think its because I wasn't cuddled enough as a child.

  4. #4
    That is some good advice WetWilly, I wish YouTube had videos of people like yourself troubleshoting the '34, now that would be helpful.

  5. #5
    If the bolt does not retract easy using the wood trick, I would focus on the cam area. Wish I could post some pics. Check out these 2 places. There have been many dicussions and troubleshooting on them. I would never have gotten mine built without them and all the helpful folks pitching in. There are some good pics on the mg42 sight in the mg 34 section that show the cams and the rivits that have caused the same troubles you have had. If the pin on the charging handle is worn you will need to replace it or build it up with weld and shape it like I did. I spent many hours polishing the cams AND the bolt trying to get mine to cycle smoothly before I found the real problem. Do you know if this was built by TNW or homebuilt using one of their recievers?
    http://www.weaponeer.net/forum/forum...p?FID=424&PN=1
    http://www.mg42.us/

  6. #6
    Pull the trigger assembly off and try moving the bolt. The bolt could be hanging up or dragging on the trigger.

  7. #7
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    Ok, the new charging handle assembly is in the way and I Finlay see the rivets holding the cams in place. they are slightly raised and look like they have wear on them. I got the dremmel tool out to polish them so say a prayer for me!
    I think its because I wasn't cuddled enough as a child.

  8. #8
    I used a dremel with some of the "flapper" type tools. Then used a polishing tip. Go slow and check often.

  9. #9
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    Alright. I polished as much as I feel comfortable for now as my pin on my charging handle Is totally wasted. Its hard to tell how hard It pulls with a wood stick. I ordered a charging handle from numrich and I hope its in better shape than mine. I received the gun in Its major pcs. and the guy who shipped It left the bolt in the receiver. When I got It home the bolt was jammed in limbo with the charger handle pin. I was forced after lots of prying and pushing with my fingers to tap It with a small plastic hammer which freed It from the pin but totally chunked It. Now for another bolt question. My bolt is different than all the ones I see in pictures. Theres some guy on youtube that shows how to disassemble It but the jackass goes too fast. the first difference is I dont have that flap on the back to release the back of the bolt. Mine has two knurled button's I have to push together, lift up and then screw the back off. in the video he takes the back pc. of the bolt turns It around and uses the carrier to release the firing pin. that doesnt work with mine as It has a small wire lock ring holding It so I cant push It in to release that "J" shaped release mechanism. Am I supposed to take off that small lock ring? By the way wetwillie, I appreciate all the help. Im surprised your helping me after are disagreeing on another thread and I was a major smart ass! I guess you can at least agree with me when I say with all our differences we are all friends!
    I think its because I wasn't cuddled enough as a child.

  10. #10
    Quote Originally Posted by bigblock View Post
    By the way wetwillie, I appreciate all the help. Im surprised your helping me after are disagreeing on another thread and I was a major smart ass! I guess you can at least agree with me when I say with all our differences we are all friends!
    You're still a smart ass, by my god man this is an ailing belt fed we're talking about. What kind of a guy would let personal feelings get in the way of helping out in this situation?

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