B3300SU Fluid Change Confusion

[rlawrence]

Dang these manuals could use some rewriting. I thought I was changing the fluid for the HST transmission and filter like the manual says, but now wondering if I'm changing the hydraulic fluid! Yeah, it's really the same fluid right? But the manual never says that. It lists two different filters for each and different interval change outs. But if they are the same fluid, why are they not changed at the same time, and why do they even have two separate filters? Crazy and confusing, as the manual uses "hydraulic" and "Transmission" interchangeably, yet calls out filter to be one hydraulic and one transmission. Confusing.

Also, manual recommends draining rear only when changing out "transmission" filter, but removing all oil when changing out "hydraulic" filter. AND it has a heading to Change Transmission Fluid and Hydraulic Filter.... not both filters. Nuts. And don't see a reason to ever drain rear fluid when changing out transmission filter every 50 hrs.

So.... if my fluid is black, I should be changing both filters and draining front and back transmissions right? Also, what bolt size is the strainer? Nothing in manual and not one I keep. Is it 26 or 27 ml?? my 1 1/16 is just too big for it so guessing.

Thanks.

 

[North Idaho Wolfman]

Dang these manuals could use some rewriting. I thought I was changing the fluid for the HST transmission and filter like the manual says, but now wondering if I'm changing the hydraulic fluid! Yeah, it's really the same fluid right? But the manual never says that. It lists two different filters for each and different interval change outs. But if they are the same fluid, why are they not changed at the same time, and why do they even have two separate filters? Crazy and confusing, as the manual uses "hydraulic" and "Transmission" interchangeably, yet calls out filter to be one hydraulic and one transmission. Confusing.

Also, manual recommends draining rear only when changing out "transmission" filter, but removing all oil when changing out "hydraulic" filter. AND it has a heading to Change Transmission Fluid and Hydraulic Filter.... not both filters. Nuts. And don't see a reason to ever drain rear fluid when changing out transmission filter every 50 hrs.

So.... if my fluid is black, I should be changing both filters and draining front and back transmissions right? Also, what bolt size is the strainer? Nothing in manual and not one I keep. Is it 26 or 27 ml?? my 1 1/16 is just too big for it so guessing.

Thanks.

If your fluid is BLACK your in deep trouble, Hydraulic fluid should NEVER be black.
If you fluid is BLACK, load it on a trailer and take it to a dealer and have it fixed, or better yet trade it in on a new tractor, because it's in bad shape.

The hydraulic/transmission filters do different jobs.
While they share the same sump (fluid tank) they deliver to different components.
The HST (transmission) filter is a much finer element thus needs to be changed more often and also has a second filter screen that works in connection with the spin on filter.
The hydraulic filter is a much courser filter, and that fluid out of it goes to everything except the HST.

 

[nbryan]

So.... if my fluid is black,
...

1. You've drained the engine, not the tranny/hydraulics
2. The previous tranny/hydraulics fluid fill was the wrong fluid, auto tranny fluid maybe?
3. The hydraulic pump and/or transmission is fried. Burnt.
4. 2. + 3.


I hope it's 1. Otherwise BIG trouble.

 

[rlawrence]

1. You've drained the engine, not the tranny/hydraulics
2. The previous tranny/hydraulics fluid fill was the wrong fluid, auto tranny fluid maybe?
3. The hydraulic pump and/or transmission is fried. Burnt.
4. 2. + 3.


I hope it's 1. Otherwise BIG trouble.

I wish. I did engine first and all was normal.
Fluid was either original or done by a Kubota dealer. It had 99 hrs on on when they "serviced" it. Either way, it was done per specs.
"black" may be overstated. More like gray, but obviously not clear.

 

[rlawrence]

If your fluid is BLACK your in deep trouble, Hydraulic fluid should NEVER be black.
If you fluid is BLACK, load it on a trailer and take it to a dealer and have it fixed, or better yet trade it in on a new tractor, because it's in bad shape.

The hydraulic/transmission filters do different jobs.
While they share the same sump (fluid tank) they deliver to different components.
The HST (transmission) filter is a much finer element thus needs to be changed more often and also has a second filter screen that works in connection with the spin on filter.
The hydraulic filter is a much courser filter, and that fluid out of it goes to everything except the HST.

Well, "black" is subjective. Not clear. As a diver I'd say low visibility. Like maybe 1" of visibility in a bucket. On the dip stick it still looked clear. But when in my palm or bucket it showed how dirty. It was actually when I changed filter I noticed it. Was going to wait for the 400 hr change as recommended, but wasn't clear in my hand so figured I had to do it now. Now I'm thinking change now and change again in 50 hrs and see what's happening. But then the question of the post, should I change the other filter too or wait.

Figured they were separated using the same sump. But.. seems odd, as if one filter is changed and not the other, then that unchanged filter is just potentially contaminating the fluid.

Also, need to know what size is bolt on screen if anyone knows. I don't have that large mm socket, so have to go out and buy to see if I have loaded metal in the screen. I'm guessing that'll tell me just how bad the situation is.

Interestingly, I've not had any issues with the HST drive or hydraulic bucket. Maybe more noise on drive, but only noticed in high gear, and it was similar at 99 hrs when purchased. And it was clear when purchased. And not other than UDT2 has been used in it. Or actually since it is a 2014 model, it may have had UDT only in it.

 

[North Idaho Wolfman]

Figured they were separated using the same sump. But.. seems odd, as if one filter is changed and not the other, then that unchanged filter is just potentially contaminating the fluid.

Also, need to know what size is bolt on screen if anyone knows. I don't have that large mm socket, so have to go out and buy to see if I have loaded metal in the screen. I'm guessing that'll tell me just how bad the situation is.

Interestingly, I've not had any issues with the HST drive or hydraulic bucket. Maybe more noise on drive, but only noticed in high gear, and it was similar at 99 hrs when purchased. And it was clear when purchased. And not other than UDT2 has been used in it. Or actually since it is a 2014 model, it may have had UDT only in it.

Filters don't contaminate the fluid, they just quit allowing the proper amount of fluid to pass though it.

Sounds like you need to change all the fluid and filters at one time to get a good starting baseline.
Make sure you pull all the drains, there will be 4 or 5 of them.
I would also drain and refill the front axle while I was at it.

Sorry can't tell you the size of that screen, I tend to use a really good pipe wrench to pull them out.