HELP! Did I do something really bad to my B7300?

Junkman · Oct 21, 2003

Hopefully no one will ever be insulted after reading a post. We are all here to help one another and to that end, we might not always pick the best words to use, but even if we disagree, we are all here to help. I has been said that some times I am harsh, but that is me. I sometimes write with stronger words than are necessary or with a passion, but never with malice or venom intended. I hope that everyone that reads this will also feel the same way..... we are "family" and even if we don't always agree, we will always be civil and helpful to one another.

bgott · Oct 21, 2003

Can you pre- fill the hydro filter? If it isn't lower than the sump where it can gravity fill the pump might have a hard time sucking oil. Hydraulic pumps are designed to suck and pump oil, not air.

Junkman · Oct 21, 2003

I don't know if it is possible on this machine, but on my BX, the filter is in a horizontal position and there is no way to fill it first...

mahlers · Oct 22, 2003

Thanks - very good information!!

jinman · Oct 22, 2003

Well Chris, I wish you had found something, because that would have made it much easier. Is this a new tractor? Was this the first time the tractor was serviced? How much oil did you drain out of the transmission as opposed to how much you put back in? I don't expect answers to all these questions, I'm just kind of brain-storming for you "out loud." You'd think someone else with a tractor like yours would be able to tell you their normal procedure. Did you ask this question in the Kubota forum? It's a good thing you used Super UDT because that's Kubota's recommended oil. When you call one of the service numbers Junkman suggested, you won't have someone blame it on an "off-brand" product. Anyhow, you have my sympathy, but I can't offer you much else. I'm sorry you made a mess removing filters again, but I think that was a necessary step you needed to eliminate. The thought of something from the filter getting sucked into the innards of your hydraulic system is pretty scary. Perhaps the Kubota reps can suggest a bleed location. I'd be tempted to loosen a line somewhere near the pump to see if air or hydraulic fluid came out, but you'd also probably have another mess and Super UDT is an expensive mess. /forums/images/graemlins/frown.gif I used to have to bleed the hydraulics on an old Ford 4000, but that was due to air getting into the system anytime the tractor would sit for a couple of weeks unused. Good luck, and please let us know what you find out.

This is the statement you made that concerns me most:
( I cleaned off the filings on it, and replaced it. )
How many "filings" did you find? If metal particles were "stirred up" they may be blocking a tiny orifice somewhere in your system. I don't know, but I'm starting to have a bad feeling about this. I'd say be sure you tell the Kubota folks about what you found.

Egon · Oct 22, 2003

Re: HELP! Did I do something really bad to my B730

In addition to Jinmans comments I would suggest you drain all the new oil out and duplicate everything you had done the first time. reuse the oil drained out or perhaps put the old oil back in just for the working on it period to cut the cost of new oil. Really wish I could be of some usfull help but that's the limit of my ideas.

Something seems off. Just some little thing.

Egon

Kelvin · Oct 22, 2003

Just a thought...

( I changed the engine oil and filter, transmission oil and filter, front axle oil, fuel filter and air filter.

I followed the procedure in the manual to the letter!

...and I realized that the transmission fluid was a little higher than the full mark on the dipstick. Today, I drained about a quart, to get it back between the lines. )

By following the procedure to the letter I assume that you put in the correct amount of UDT fluid. Since your dipstick indicated too much UDT fluid after filling it up, then I'll agree with others that it appears that you may have a lot of air in the system that is causing your problems.

Good Luck,
Kelvin

DavidJ · Oct 22, 2003

After reading the rest of the posts here I tand to believe the trapped air theory.

I ran the tractor at about 1500 RPMs for 10+ minutes.

When you ran the engine did you have the hydro in gear or was it in neutral? If it was in neutral I would check and see if the manual says you should run it in gear so the system will rid itself of excess air.

BIGUN · Oct 22, 2003

I am not familiar with servicing the B7300HSD, but it seems like so many times that a problem like this occurs because fluid was drained from one area and then added back to another area. The statement about draining fluid in two places and then the level being too high on the dipstick makes me wonder.
I had my old Ariens hydrostatic not work after servicing it once when I forgot to release the pressure relief valves that let the transmission freewheel. This probably doesn’t apply to this tractor though.
Let us know what you come up with. I bet it is something really simple. /forums/images/graemlins/smile.gif

skent · Oct 23, 2003

My B7300HST has a change to the manual (concerning fluid changes). After changing hydro filters and fluid, It states to start and run the engine for a minimum of 30 seconds with the clutch held in. This allows the hydraulic pump to charge the filters and hydro transmission full with oil before the hydro itself starts spinning (ie: clutch engaged). They then go on to say the 3PH should be cycled a few times before letting out the clutch. When ever I change my fluid, I usually give it a minute or more.
The changes were added to the manual after printing (it's like a big sticker placed over the entire page).
Keep us posted with what you find.