Rear Differential Fluid... - Polaris ATV Forum
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post #1 of 8 (permalink) Old 03-19-2011, 05:44 PM Thread Starter
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Rear Differential Fluid...

Well today I completed my first ever service on anything! I changed all fluids with Amsoil, except the rear differential where I felt that Valvoline Full Syn 75-90w speced out much better. I greased all fittings and to my suprise it required 3 pumps on all (at 3 I could see it slightly ouzing out of the seals).

Anyway, the rear diff calls for 7.2 ounces, but it states (Not to overfill). So I stopped at what I gauged was 7.2 ounces but it was not seeping out of the fill plug. I guess it just makes me a little uneasy not having a gauge of measurement...

Any thoughts on this?
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post #2 of 8 (permalink) Old 03-19-2011, 08:35 PM
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Just fill to the bottom of the fill/check plug. That's why it's placed on the side where it is, instead of on top.

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post #3 of 8 (permalink) Old 03-19-2011, 11:02 PM Thread Starter
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Quote:
Originally Posted by Razorback View Post
Just fill to the bottom of the fill/check plug. That's why it's placed on the side where it is, instead of on top.
That is exactly what I thought, but in the owners manual it strictly states NOT to fill to the Fill Line... Can an overfill hurt the feat differential?
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post #4 of 8 (permalink) Old 03-20-2011, 12:05 AM
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So then why did the put a fill line on it? LOL

I don't think it's gonna hurt anything. Mechanics at the dealers don't measure out the fluid. They just fill it to the plug. I bet that if you'd have measured the amount of oil that drained out of it, there was probably more than 7.2oz in there already.

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HD springs
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post #5 of 8 (permalink) Old 03-20-2011, 08:25 AM Thread Starter
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Good Point, but by nature I'm a direction follower and I just did not know if adding too much could harm the rear differential. Thanks
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post #6 of 8 (permalink) Old 03-20-2011, 09:08 AM
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Quote:
Originally Posted by mngatorhunt View Post
Well today I completed my first ever service on anything! I changed all fluids with Amsoil, except the rear differential where I felt that Valvoline Full Syn 75-90w speced out much better. I greased all fittings and to my suprise it required 3 pumps on all (at 3 I could see it slightly ouzing out of the seals).

Anyway, the rear diff calls for 7.2 ounces, but it states (Not to overfill). So I stopped at what I gauged was 7.2 ounces but it was not seeping out of the fill plug. I guess it just makes me a little uneasy not having a gauge of measurement...

Any thoughts on this?
What did your fluid look like when you drained it? I changed mine a few days back and it came our discolored and streaky. The drained fluid was very light colored with a blue or silver tint streaking through the fluid. The magnet didn't have too much in the way of shavings.

To me, it looked like another fluid had been introduced into the system. The service department at the dealership believed it was nothing more than the first batch of fluids the factory uses are slightly different than the fluids we purchase. I used the Drive Fluid Plus, which looked nothing like the drained fluid.

Think I'll take it for a spin next weekend then drain it again to see what it looks like.

2010 Sportsman 550XP
2009 Trailblazer 330

Last edited by jgroesbeck; 03-20-2011 at 09:15 AM.
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post #7 of 8 (permalink) Old 03-20-2011, 09:59 AM Thread Starter
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Hey man, I noticed the blue tint as well and streaky. I had thin mist shavings on the magnet. I'm going to drain again after the next couple of rides and add the Valvoline again...
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post #8 of 8 (permalink) Old 03-20-2011, 03:46 PM
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Think the quick, and probably correct answer is that it's the factory provided fluid, which is slightly different that what we buy off the shelf. As long as I don't see similar streaking at the next change I'm calling it good to go

Cheers,
Joe

2010 Sportsman 550XP
2009 Trailblazer 330
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