need help with 2009 honda rancher 420

i am running out of options and not sure what to do anymore. i have an 2009 honda rancher 4x4 foot shift model. i have only put about six tanks of gas through it since i bought it. i have developed a really bad grinding noise from the rear end only when you make right hand turns. it does not grind while driving straight or turning left only when you turn sharp to the right. you can hear it and feel it throughout the bike. it has been into three different dealerships now and not one dealership can figure out what is causing the grind. they said the bearing all look ok, the shims are to spec and everything in the rear end looks normal. it has solid rear end with drum brakes. Is this a normal sound for this model ?or does anyone know what is causing this grinding noise?

have you drained your rear diff oil? if so was there any metal in it? it could either be to low of side bearing preload in the diff or your left rear wheel bearing is brennelling or flaking but has not yet loosened off. i have seen this on alot of bearings. especially ball bearing types. this is more prominent in KLM bearings. I hope this will be of some help.

I agree, draiin that diff oil to see if there are metal filings in there. Turning sharp right would put weight on the left side of the atv. Does it sound more form the rear or wheel area?

i didnt get to see the fluid cause the dealership drained it so who knows if they will tell me the truth. could the bearing just be defective from the factor? the sound seems to like it is coming from the rear diff, the sound is on the left side in the rear end and you can feel it in the left foot peg

yes it is possible to get defective bearings from factory. if you put enough miles on your atv (approx30 miles or so the oil will pick up any metal left in the diff. they will not get all of the filings out when they drained it. i would pick up the factory rear diff oil and drain it yourself. catch it into a clean white container. then shine a flashlight into it. if you see metal reflecting the light in the oil then there is possibly a rear diff issue. if not i would do some close inspecting of the left rear corner. does the noise sound loud and higher pitched or is it deep and hollow sounding?

its a deep grinding noise, the dealer just told me that they found some scoring on the gear in the transfer case but said they are not doing anthing about it, could that be a cause?

yes that would cause the noise. if it is a deep noise it is coming from internal parts. if there is scoring on the gears in the transfer case then i would question it. is it still under warranty? if it is i would say WTF!!! there should be no scoring on your gears unless there is a problem. if it is under warranty i would be very stubborn and make them fix it. sometimes you have to email the factory complaint department.

hey sounds like right bearing to me.not much it could be.good luck rick

got it back from dealer they tried a fatter shim in rear end and that helped a little but still there, honda said there is nothing more they can do so i am on my own, i think the next step is to try new bearings cause my mechanic at work said there is no way to check sealed bearings and they could look ok to the eye but really there could be a small defect with them so monday i guess will order some new ones and hope that is the problem

Is this machine still under warranty? If so, I would not let the dealer tell you that there isn't anything else they can do. If it is under warranty, it is thier responsibility to fix it period. If it is not under warranty, then I would say your friend is right, you cannot tell if a sealed bearing is bad just by looking at it unless it is completely wasted and comes apart. If there is a bearing that is so bad that it allows enough movement to damage gears, then I suppose a bearing problem is a possibility. However, if your problem is a bad bearing or two, and the dealer techs couldn't figure that out, then someone needs to be hit in the head with a big ass hammer. I am also wondering if the damaged gear in the t case is even related to the noise that you hear only when turning right? That seems more like a diff or axle bearing issue, I don't see how the two could be related. I think you have two different problems.