Rancher 420 Differential Oils? - Honda ATV Forum
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post #1 of 5 (permalink) Old 02-14-2011, 02:44 PM Thread Starter
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Rancher 420 Differential Oils?

Can someone please explain to me how/where to check & drain my front and rear differentials on my 2007 Rancher.

I opened the top plug on the rear diff. and couldn't see/feel any oil, but I read online somewhere that the top plug is for filling and there's another plug for checking and another for draining...is this correct?

How about the front diff.? And I suppose any 90 weight gear oil would be fine in them, correct?
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post #2 of 5 (permalink) Old 02-14-2011, 02:57 PM
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Yeah, the rear diff has a check bolt on the left side of the diff, down near the bottom. Take the check bolt out and fill through the top oil fill cap, until the gear oil is up to the bottom of the check bolt hole. The drain for the rear diff is on the bottom, right side under the skid plate.

The front diff is different. The oil fill cap is down lower on the side of the diff. On the front diff, just pour the gear oil in the oil fill hole and when it comes up to the bottom of the hole, it's full. Of course, the drain plug is on the bottom of the front diff, as well.

Both diffs use hypoid SAE#80 gear oil, any brand will be fine.

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 #3 of 5 (permalink) Old 02-24-2011, 11:44 PM
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I agree with Helmut(Super Moderator). I also check bolt out and fill the used differentials through the top oil fill cap, until the gear oil is up to the bottom of the check bolt hole. It is similar on what Helmut stated.

Last edited by kenbarls; 03-04-2011 at 11:27 AM.
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post #4 of 5 (permalink) Old 02-25-2011, 09:33 AM
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Honda calls for Hypoid gear oil. I don't know what the difference between regular gear oil and "Hypoid" is but that's what I use, Honda stuff

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post #5 of 5 (permalink) Old 02-25-2011, 02:37 PM
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Quote:
Originally Posted by Ballast View Post
Honda calls for Hypoid gear oil. I don't know what the difference between regular gear oil and "Hypoid" is but that's what I use, Honda stuff
Yeah, "hypoid" gear oil should be used. It's designed to hold up better in differentials that contain hypoid gears, such as ring and pinion gears. Doesn't really matter what brand it is though.

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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