Honda Fourtrax 300 Rear Differential - Honda ATV Forum
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post #1 of 17 (permalink) Old 10-18-2013, 08:39 AM Thread Starter
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Honda Fourtrax 300 Rear Differential

Hi folks,
names Mark
new to the fourms, joined up a few weeks ago.
Great info and I found lots of help.

I just picked up a '95 Honda Fourtrax 300 4wd, which had some issues when I bought it.

I pulled the rear end apart, had some minor damage but I'm replacing all the bearing, seals and o-rings.

I have a question about the 2 axle bearings and upper drive bearing.
The service manual doesn't really mention and I asked the dealer and they confirmed that I DO NOT need to pack the bearings in grease.
The axle bearing get lubrication from the gear oil in the case, sure no problem. But where does the upper gear bearing get lubrication?

I have attached an image, axle bearings are #27 and upper gear bearing is #28 (highlighted in red).

Click the image to open in full size.

I was just wondering if I could grease the bearings a little bit, I just can't get past putting an exposed bearing into something, while not being greased.

Any input or info is appreciated.

Thanks in advanced
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post #2 of 17 (permalink) Old 10-18-2013, 11:53 AM
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The upper bearing is splash lubricated. You have to remember the 300 isn't a fire breathing machine that runs 100mph, top speed is only like 45. There is plenty of gear oil being thrown around in there. Tha trick is to keep the oil clean if you ride mud/water because those rearends are not cheap.

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post #3 of 17 (permalink) Old 10-19-2013, 06:44 AM
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I am rebuilding my diff to and I have put grease in it. Its not really needed. But something I have always done to help the new bearings on initial start up. The old man has always done it on every car/farm machine and never had a problem and I do so now to.

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post #4 of 17 (permalink) Old 10-19-2013, 12:00 PM
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the rear differental has gear oil splashing all around inside it...everything is getting oiled by the gear oil. what keeps this gear oil in...is the pinion seal, and the differental seals you see at the sides of the differental. if these seals go bad ?..then they will leak gear oil. and most times..if the bearings go bad ?..then the seals will follow !.

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post #5 of 17 (permalink) Old 10-25-2013, 08:45 AM Thread Starter
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thanks for the info guys.
I'm picking up one final part today and hopefully get it all back together.
I have everything cleaned up and some of the case assembled.

I do have another question. First, theses bikes are completely new to me. I'm usually working on snowmoblies and vehicles.

I bought the All Balls Racing bearing rebuild kit (25-2010 All Balls Racing.

The kit has 4 seals, 3 of the seals I have in place, however I don't know what the other seal is for.

If I look at the diagram I added above, I only see 3 seals or am I missing something?

Can anyone point me in the right direction?
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post #6 of 17 (permalink) Old 10-25-2013, 12:22 PM
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oil versus grease

I have seen where the after market kits will have an extra seal in them , I'd guess the kit is universal and fits more than one application , match up what you need and don't worry about anything left over ----------- I don't like putting grease on the bearings as it will discolor the oil once you run it , not that it will hurt the oil any , but I'd like to monitor the oil by it's cleanliness , so what I do is have a squirt oil can with the oil I am putting in the differential and squirt it into the bearings as I assembly it
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post #7 of 17 (permalink) Old 10-25-2013, 12:56 PM
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Quote:
Originally Posted by slvdak View Post
thanks for the info guys.
I'm picking up one final part today and hopefully get it all back together.
I have everything cleaned up and some of the case assembled.

I do have another question. First, theses bikes are completely new to me. I'm usually working on snowmoblies and vehicles.

I bought the All Balls Racing bearing rebuild kit (25-2010 All Balls Racing.

The kit has 4 seals, 3 of the seals I have in place, however I don't know what the other seal is for.

If I look at the diagram I added above, I only see 3 seals or am I missing something?

Can anyone point me in the right direction?
i'll bet that other seal is for the brakes backing plate !!!..if you look at the inside of your rear brake area ?..you will see a dust seal just inside where the axle pokes through. this is what i think anyway for the extra seal.

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post #8 of 17 (permalink) Old 10-25-2013, 03:56 PM
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extra seal

I just came in from starting a rebuild on my 250 differential that I am putting in a 300 , the kit I got is a Quad boss and I had exactly what I needed no extras ------but if I remember right from past 300 kits , there is two choices of seals on the left side the differential , the older bikes had just a regular lips seal , where the newer ones like 99-2000 had a seal with a out going lip that sealed against a steel washer which sits behind the axle nuts , this was a much better design in my eyes as it helped keep dirt out the seal , I have modified the older one by using the newer style seal and adding the steel washer , I think was about $7 for that washer but worth it , so I think that is why you have an extra seal to cover all years of the 300 -----------the brake seal would come in another kit , going to try and post some pics I took of the differential build under a thread I have on 250 differential
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post #9 of 17 (permalink) Old 10-26-2013, 03:12 AM
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I understand your dilemma. Dry bearings make me cringe also. If you intend on sticking with gear oil as your lube, you can coat the bearings with engine assembly lube. It goes on like grease but once oil touches it, it dissolves. It is made just for instances like this. Also, the front assemblies of a gear box aren't "splash" lubricated but rather sprayed (usually directly) from the ring gear. As you drive forward the ring gear's teeth with pick up the gear oil and sling it towards the front of the housing naturally because that's the way it's spinning. It's literally pumping fluid on the front of the housing. Saying "splash" lubricated gives me the impression that the more bumps you hit the better your bearings will be lubed, which quite frankly isn't true and gives a tainted impression for new comers.

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post #10 of 17 (permalink) Old 11-19-2013, 01:08 PM Thread Starter
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Thanks for the help guys.
Bike is back rolling and rear end doesn't seems to be leaking. More items to fix now.

Heres a pic

Click the image to open in full size.
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