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Discussion Starter #1 (Edited)
HI new here, my buddy has an 05 350 fourtrax that appears to have a bad bearing at the top of the swing arm (can grab racks and move atv side to side and see it move). My friend isnt very mechanical so he had his father in law take a look at it and said he could not remove it because there was a special nut/bolt keeping him from doing so. i am all for tearing into but my friend would like to make sure it is something we can tackle, i have not had the chance to take a good look at it so i was wondering if someone could tell me what it is? thank you.

ok i found a pretty good how to guide on the net; they are refering to it as a "castle nut looking lock nut", what would be the best way to remove this and reinstall it
 

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if the lock nut on the...right? cant be adjusted. build a box out of plywood and 2x4. 2"-4" higher than stock frame height. use some poop, and tip the wheeler way up...then stuff yer box up in there (oh yeah, loose the lugs first) all four will be off ground. remove shock bottom, (w/jackstands to hold axle up) lower front of swingarm remove&replace bearings and reinstall in reverse order.
 

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This sounds like the same thing i had to do to my 2005 Rancher AT 400. Sounds like its where the swing arm connects to the frame in front of the rear tires. If this is it there are two bolts, called the pivot bolts, that have to come out. They take a 17mm allen socket or allen wrench to take out. The socket is much easier to use and the bolts are extremely tight. There is also a locking nut that spins on the pivot bolt on the right that needs to be loosened first. You also need to take the bolt out of the shock on the bottom side, the rear axle, and take the brake cables off as well. Basically take all the things off that are connected to the rear swing arm as you are going to want to take it completely off and over to a bench. After it is off you will be able to get to the bearings which are a royal pain in the butt to get out. Just a thought, you might want to look at the rear wheel bearing and seal too. Mine was bad also and chances are if the swing arm bearings are shot then so is the wheel bearing and seal. There is only the one of them and it is on the left side. Changing the wheel bearing and the swing arm bearings took me about 4-5 hours so plan on having a full day to do this, also in case you need to run and get parts. If this is it and you have any questions let me know.
 

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Discussion Starter #4
thanks, thats what i was looking for, the axle it self seems pretty tight but i will check that bearing as well
 

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From what I could see is you either got to take a big Allen wrench and screw it out or Try and get the outer ring to screw out. I would say the lock nut should turn out You could try a pair of needle nose pliers and turn it out. It should look like 3 slots in the lock nut. I hope this will help. You could spray some PB Blaster in and around it and try working it loose.
 

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Hello Duke, let me know what you find out, I am taking a 86 fourtrax apart, and I think it has that same nut on the right side. I havent tackled that yet, but I think your looking for something like this, I found on bike bandit.

http://www.bikebandit.com/motion-pro-honda-cr-seal-bearing-retainer-tool

This is for a CR, and I havent found the correct one for the fourtrax yet. If you find it first let me know.
 

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FYI guy thats a spanner tool and it is basically the same as a 4X4 lock nut in a truck I think the rangers are pretty close if my memory serves me.
 

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alright thanks for taking the time...got bearings, just need get the lock nut out and don't want to buy the 80 dollar tool...maybe the Honda guy will just pop it loos for me who knows? Have a good Thanksgiving...
 

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Atvtech gets the credit for this write up


If you’ve ever removed the swingarm from your straight axle Honda ATV, you’ve seen the locknut on the right side swingarm bolt. This locknut requires a special tool that is not easily obtained and a little on the expensive side. You can make your own tool to allow easy removal/installation of the swingarm locknut. (This does not apply to the Rancher 420 as it uses through-bolts to fasten the swingarm.)

This is the locknut in question.


And here is the special Honda locknut tool.




To make your own locknut removal tool, grab an old 1" impact socket and grind/cut the end to form four equally sized tabs that fit into the locknut’s notches. A bench grinder and rotary tool with cutting disc make this an easy modification. Here is what the modified socket should look like.


 

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I am about to try this same thing on mine and have read where someone has taken a lug nut and welded it on to the socket and cut groves in it to fit the special app. however i havn't even torn mine apart to get to that yet! good luck
 

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I have done this repair on various ATVs. It is best to buy the tool if you can find one, but it can also be made from an old socket or lug wrench as previously discussed. If you can't buy one or make one, you can use a big punch or something similar as a last resort, but it's not recommended. I have done it successfully, though. Note that you only have to break the lock nut loose. You don't have to turn it all the way off the pivot bolt as it will turn on off with the pivot bolt when you take the pivot bolt out. Make sure you're allen wrench or allen socket fits the pivot bolt real good, because on a lot of ATVs they are extremely tight. If it slips and rounds out the bolt head, you will have a big problem. Sometimes one will not be extremely tight, but I have found this to be rare. Also, when you get the bearings in the swing arm and start reassembling it, be careful not to tighten the right side pivot bolt too tight, as you can damage the frame and cause the bearings to go out prematurely. As you tighten the pivot bolt, if you tighten too tight, you will see the frame start to bend out and you will see the space between the swing arm and frame starting to get bigger. You don't want this to happen. You just want to tighten the pivot bolt down snug, but you will want to tighten the lock nut real night. I don't know the exact torque for it, but it needs to be real tight. You will need to hold the pivot bolt with an allen wrench or socket, to keep it from turning, while you tighten down the lock nut. It's a good ideal to mark the pivot bolt and the lock nut with a punch or chisel, so you will be able to look at it and make sure it hasn't loosened up. After you ride it for a little while, check it to make sure it hasn't loosened up. Sometimes they do, if you didn't get the lock nut tight enough. Keep an eye on it every time you ride it for a little while, to make sure it isn't going to come loose. Good luck.
 

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if there are three slots in the nut then the best thing to use is a spanner wrench. Much safer on the knuckles too!!
 
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