Is this correct?? 400ex Rear Axle - Honda ATV Forum
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post #1 of 13 (permalink) Old 06-15-2011, 03:23 PM Thread Starter
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Is this correct?? 400ex Rear Axle

These pics are from the back of my 400ex. Is this how the locknut is supposed to be located? Also there is a very slight rotational movement when I try to turn the locknut and collar by hand. The locknut, collar and the threaded section move as one. They rotate maybe a degree.
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post #2 of 13 (permalink) Old 06-15-2011, 03:38 PM
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Nope,you have them in the wrong position...The 1 with the smooth area goes on 1st with the smooth part inwards like it is sitting on there now,and the skinny nut locks against it using 2 wrenches if I remember correctly....

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post #3 of 13 (permalink) Old 06-15-2011, 03:56 PM Thread Starter
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Basically the collar nut is supposed to be against the rotor covering up the threads and the backup nut holds that collar on there.

I thought so, I just bought this quad and the rear pads were worn down to the backing plate. When I was fixing the brakes I noticed the lock nut really didnt seem to be doing anything. How can i tell if this is the factory axle and if it is why would he take apart the rear??

Thanks for your help!
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post #4 of 13 (permalink) Old 06-15-2011, 04:00 PM
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Just by looking at the pics posted I'd say it was a stock axle as usually people put a wider axle on when,or if they have to replace it,plus it has the OEM cadmium patina to it unlike the aftermarket shiney look...As to why take the rear apart the bearings need replacing in them often times if ridden hard,or mud riding seems to accelerate their going out on the exs from my past experiences with them...

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post #5 of 13 (permalink) Old 06-15-2011, 04:01 PM Thread Starter
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post #6 of 13 (permalink) Old 06-15-2011, 04:05 PM
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That looks right to me. There's a stopper ring on the axle that the big nut tightens out against. You can't see the stopper ring in the picture, as it's under the edge of the big nut. The nuts have left hand threads so when you turn the big nut clockwise, it locks against the stopper ring and pushes the threaded sleeve in against the brake rotor hub. Then the smaller nut locks against the big nut.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.

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post #7 of 13 (permalink) Old 06-15-2011, 04:15 PM Thread Starter
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OK one person says no and another says yes LOL. OK if that is correct should I be able to move that assembly with my hand no matter how slight?

The service manual doesnt make this assembly any clearer. I googled pics of rear axles on 400exs and most were antifade units (sigh). Are antifades worth the money?

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post #8 of 13 (permalink) Old 06-15-2011, 04:26 PM
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K,I was remembering wrong...Here's a diagram that shows the proper installation order...
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post #9 of 13 (permalink) Old 06-15-2011, 04:32 PM
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Quote:
Originally Posted by MarioWeldingInc View Post
OK one person says no and another says yes LOL. OK if that is correct should I be able to move that assembly with my hand no matter how slight?
I'm not sure if it's normal to be able to move that a very slight amount or not. I know it shouldn't move much at all because of the splines on the axle. You might want to loosen the lock nut and re-torque the big nut just to make sure. Some of the sport quad guys should be online soon and they can tell you for sure.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.

Last edited by Helmut; 06-15-2011 at 04:35 PM.
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post #10 of 13 (permalink) Old 06-15-2011, 05:23 PM
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Loosen the slim nut all the way to the rotor getting it out of the way, now turn the big nut towards the front of the quad you need to support the rearend off the ground too by the way. keep turning the big nut until it feel snug, now grab the rear wheels and wiggle them front to back alternating ie. push with one hand and at the same time pull with the other if the axle has any movement turn the nut more it will tighten up on the collar stop ring if it dosent then either the big nut is stripped on the threads closest to the hex part or the threaded collar is stripped.

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