Oil & Fuel Gear oil in front axle specs

[ovrszd]

Yes, the honey comparison is an exaggeration, and it was in response to someone else who used it first, suggesting that 80-90w was like honey.

Not going to argue this further. Everyone is welcome to believe as they choose. And clearly some people are not willing to accept this, even though information is available saying the same thing I am.

We are not arguing. Each has their opinion based on personal experiences with each type of oil.

Yesterday I used two plastic water bottles for containers. Drilled 1/8" hole in the center of each cap. Filled them about 1/3 full, one with 80-90w and one with JD HyGuard. The oils were shop temperature, 70-ish degrees.

Drilled two holes in a 1"x4" short board big enough for the bottle caps to slip thru and hold the bottles upside down. Then laid the bottles on their sides and drilled a 1/4" hole in the side of each bottle that would be above the oil line when they were inserted in the board.

Placed the board over a trash can and simultaneously inserted bottles upside down so oil would flow out the cap holes.

I considered the test completed when the first bottle quit running a constant flow and started dripping. The HyGuard bottle stopping flowing first. 6 seconds later the 80-90w bottle quit flowing. This was over a span of 2 minutes of flow.

I conclude that the difference in flow rate for 80-90w versus Hydraulic fluid is insignificant. They do appear to have almost identical viscosity.

Learn something every day!!! And yes, I was bored and nothing else going on in my toasty warm shop!!!!

Thanks to ray66v for bringing this up. I would have never tested that theory if he hadn't.

 

[Bluegill2]

Good Test Richard!

I wasn't going to go that far, but just did a visual and the 80W oil looked thicker.

I'm comparing Kubota's SUDT2 and it does seem to be thinner than other hydro oils? Very thin!

 

[ovrszd]

Good Test Richard!

I wasn't going to go that far, but just did a visual and the 80W oil looked thicker.

I'm comparing Kubota's SUDT2 and it does seem to be thinner than other hydro oils? Very thin!

Yep, I'd say there are differences in multi-grade hydro oils. I'm not sure what the HyGuard is?? I'm pretty sure that SUDT2 is multi-grade and it's synthetic I believe.

When I was pouring the two oils I thought the 80-90w appeared to be thicker. Sure didn't turn out that way, or at least not much thicker.

 

[ray66v]

I conclude that the difference in flow rate for 80-90w versus Hydraulic fluid is insignificant. They do appear to have almost identical viscosity.

This is one of those things people just don't seem to want to accept. So, I choose sometimes to limit my frustration, and stop trying.

Your welcome. And, thank you for going too far, and finding the truth.

There is also lots of information people who like to read, on the internet, explaining more about this.

Keep in mind, the viscosity of one brand 80-90w gear oil, and another, at a given temperature will be slightly different. As well as the hydraulic transmission oils have slightly different viscosity's. You can see this by Looking the specifications up.

That means the results of a test like you did will vary. But, will it not change the fact that they are basically the same thing.

The first clue now makes a lot more sense. The one where the owners manuals say they are interchangeable.

 

[V1Rotate]

On a slightly different note.
After buying a used BX1500 I changed out all of the fluids using SUDT2.
Shortly afterward the front axle seals started to seep a little. Has this happened to anyone else or was this just a coinsidence?

 

[ovrszd]

On a slightly different note.
After buying a used BX1500 I changed out all of the fluids using SUDT2.
Shortly afterward the front axle seals started to seep a little. Has this happened to anyone else or was this just a coinsidence?

I've heard others complain about that. That fact always added confidence to my theory that hydro oil was "thinner" than 80-90w.

And again, I think SUDT2 is multi-grade and synthetic. I think in the test I performed it would flow faster than 80-90w. I only JD HyGuard to compare with.

 

[MHarryE]

This chart shows the different oil type classifications so you can see that in general 80W gear oil is close to SAE 20 engine oil, but from there you need to consider temperature, viscosity index, dynamic viscosity and kinematic viscosity. If you get your 80W-90 gear oil up to 212F it will be more like SAE 40 or SAE 50 at that same temperature.

 

[Bluegill2]

On a slightly different note.
After buying a used BX1500 I changed out all of the fluids using SUDT2.
Shortly afterward the front axle seals started to seep a little. Has this happened to anyone else or was this just a coinsidence?

I've also heard of this happening to more than a few. It usually takes a few hundred hours from what I've read.

SUDT2 is Very Very Thin!

 

[ray66v]

To illustrate how these products vary in viscosity:

Hy-gard has a viscosity of 59 cSt @ 40C. Using the chart Harry provided, (thank you), you can see from the scale on the right hand side, it's the same as 80w gear oil.

Kubota SUDT is indeed slightly thinner, 37 cSt @ 40C. putting it in the top range of 75w gear oil. But, it does thicken to perform as 80w at 100C, with 8.1 cSt.

Amsoil ATH, (what I use), is 53.7 cSt @ at 40C. and, 9.8 cSt @ 100C. Both would be 80w on the gear oil scale.

I used to have a link to the spec's for Permatran, (hard to find), but I don't anymore. For some reason MF keeps them a secret. :laughing:

So, if you have one of those ugly orange tractors, you could look for a gear oil in the higher viscosity range, and indeed have an oil in the front axle that would be slightly thicker, to help with leaks. Whether it is enough to matter is the next question. :confused3:

 

[dragoneggs]

We are not arguing. Each has their opinion based on personal experiences with each type of oil.

Yesterday I used two plastic water bottles for containers. Drilled 1/8" hole in the center of each cap. Filled them about 1/3 full, one with 80-90w and one with JD HyGuard. The oils were shop temperature, 70-ish degrees.

Drilled two holes in a 1"x4" short board big enough for the bottle caps to slip thru and hold the bottles upside down. Then laid the bottles on their sides and drilled a 1/4" hole in the side of each bottle that would be above the oil line when they were inserted in the board.

Placed the board over a trash can and simultaneously inserted bottles upside down so oil would flow out the cap holes.

I considered the test completed when the first bottle quit running a constant flow and started dripping. The HyGuard bottle stopping flowing first. 6 seconds later the 80-90w bottle quit flowing. This was over a span of 2 minutes of flow.

I conclude that the difference in flow rate for 80-90w versus Hydraulic fluid is insignificant. They do appear to have almost identical viscosity.

Learn something every day!!! And yes, I was bored and nothing else going on in my toasty warm shop!!!!

Thanks to ray66v for bringing this up. I would have never tested that theory if he hadn't.

Great test... I love it when someone brings some empirical data to the table... I mean forum. Now I would say... what about at different temps. Some oils viscosity might vary comparably at low temps (if anyone cares). Just stirring the pot here.