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BX-2200 transaxle filter imploding

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tool man
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2006-05-07          129045

tractor ran great until filter buldged out and ruptured. Installed another and got about an hr of run time before it ruptured again. I own all the service manuals and none talk about this happening. Where would you start trouble shooting?

eager to fix
tool man


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AV8R
Join Date: Oct 2003
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2006-05-07          129046

The dealer?

Seriously, that sounds like a major problem. ....

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earthwrks
Join Date: Dec 2003
Posts: 3853 Home Office in Flat Rock, Michigan
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2006-05-07          129051

Seems a little odd that it took an hour of use to develop the problem again. Typically hydraulic problems are instantaneous---all things being equal. I'm thinking you must be using a hydraulic circuit which could be the cluprit some time after you are using the machine for awhile. Does it have a loader or aux. ports which have quick disconnects? It still shouldn't affect the system but a quick disconnect that isn't fully seated will prevent a cylinder from working properly causing a relief valve to blow by. Perhaps the relief valve isn't working. ....

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Art White
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2006-05-08          129066

Alright, what adjustments to the hydraulic system have been made? Is it a Kubota filter? ....

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yooperpete
Join Date: Jan 2004
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2006-05-08          129067

When changing the filter, did you also change oil? If so, do you have the correct oil weight in it? Could it have a slug of contamination in it? ....

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DRankin
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2006-05-08          129069

That is not an IMplosion. It is an EXplosion in progress.

See Art's comments........... ....

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Murf
Join Date: Dec 1999
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2006-05-08          129074

Off the top of my head it sure sounds like you have a 2 hydraulic hoses reversed and are thus pressurizing the return line.

Not a good thing .......

Best of luck. ....

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tool_man2
Join Date: May 2006
Posts: 11 ohio
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2006-05-08          129107

Art,

The oil was changed along with the OEM filter this past fall, probably have put 10 hrs on the machine before this happened. Whats confusing is the machine ran fine. Tonight I took the low and high pressure plugs out and tomorrow I'm going to buy test plugs for gauging. My thought is possibly the high pressure check is leaking through and sending enough volume of oil that the low pressure relief can't handle it all. If this is the scenario, the tractor would run except for achieving proper speed. I can't confirm this because I was mowing the the lawn at time of incident. You think I'm heading in the right derection?
Regards,
Tool Man ....

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tool_man2
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2006-05-08          129109

eartwrks,

The machine has a FEL which was off at the time. I checked the quick disconnects and they appear to be ok.
Regards,
tool man ....

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tool_man2
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2006-05-08          129110

DRakin,

I agree EXPLOSIAN, still not a good thing
Regards,
tool man ....

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tool_man2
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2006-05-08          129111

Murf,

All hoses appear to be ok.

regards,
tool man ....

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earthwrks
Join Date: Dec 2003
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2006-05-08          129119

What do mean by "removing high and low pressure plugs"?

Also, if your orange is anything like my blue, the hydro pump is isolated from the accessory pump. And if I'm not mistaken (and I could be---too lazy to go look) they're both separate from the power steering (Super Steer) system, so it wouldn't make sense about getting up to speed since they may not be related. ....

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tool_man2
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2006-05-09          129131

earthwrks,
everything you said is the same as my orange. The suction oil which the transaxle uses is all the diverted oil from the other systems going back to tank. Beyond the filter, towards the Hydro motor and pump you have a low pressure relief valve set at approx. 70 lbs. This is what I will be monitoring. This low pressure passage also feeds the Hydro pump and motor. When the varible displacement pistons are on the unload end they pull from this low pressure passage. When the pump or motor see high pressure a check valve closes at this passage. I'm hoping to find my excessive pressure in the return system here. It's a start any way. Wish me luck!

Regards,
tool man ....

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Murf
Join Date: Dec 1999
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2006-05-09          129138

Toolman, there is only one way to blow a filter, you have pressure(and lots of it) where there should be none.

Basically look at everything that was touched since it was last run when it didn't blow the filter off. If no lines have been touched then it has to be internal, and there are very few things, like the relief valve you mentioned, that could cause that to happen.

Best of luck. ....

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Art White
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Posts: 6898 Waterville New York
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2006-05-09          129150

Is this a BX22 or a 2200, just checking. ....

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earthwrks
Join Date: Dec 2003
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2006-05-09          129167

Toolman I have my doubts about that low pressre line---my experience is that is what is called the "charge" line to keep the pump swash plate against the small slippers on the ends of the pistons, and keep the seals and bearings wet. Here's a thought: I have a large Case trencher with a dozer engine in it. I was trenching one day under full power when it caught on a chunk of concrete and it siezed up so quickly the pump relief valve didn't have time to react and so the pump front seal blew out filling the pump drive box and out the vent. You may have the same sort of thing where errant pressure is going to the wrong place---I dunno. (Trencher is for sale too) ....

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tool_man2
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2006-05-10          129178

Art,

BX-2200, 2001 model.

Regards,
Tool Man ....

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tool_man2
Join Date: May 2006
Posts: 11 ohio
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2006-05-10          129180

earthwrks,
Unfortunately I can only view 1/2 of your response due to not being a premium member. So far I like how this discussion thread is moving and I'm seriously considering to join, maybe at a later date. You are correct by calling this the charge sytem. Is it possible to reply with the later portion of your previous response?

Regards,
tool man ....

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Art White
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Posts: 6898 Waterville New York
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2006-05-10          129181

This is not at all a common problem or one that I've heard of on these tractors but it can happen as I've seen it before on others. ....

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Gearhead
Join Date: Jul 2005
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2006-05-10          129203

Shounds like the charge releif valve is getting stuck. ....

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tool_man2
Join Date: May 2006
Posts: 11 ohio
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2006-05-11          129213

To all,
Recieved all my test ports and gauges. Last night I started with a visual exploratory. Removed all plugs where the test ports were going to be installed. Looked in all passages with a pen light. BINGO! found a blockage inside the charge relief passage. Used a small packing puller hoping it it was soft yet durable to be extracted. No good, the pieces which I was removing appeared to be a rubber gasket. Tried back flushing and was able to open the passage but there is still material in there. I've elected to pull my Transaxle and open it up. My guess at this point is at one time somebody used a generic filter which came apart. I will keep you all posted with more detail as I dig further. I hope it was a generic filter nad not an OEM Kubota filter !

Thanks for all the help,
Keep tuned in for further details,
Tool Man ....

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tool_man2
Join Date: May 2006
Posts: 11 ohio
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2006-05-14          129338

To all,

All fixed and back to mowing. Just a major labor job, 20 hrs total and did'nt have to buy a part other then another filter.

Thanks,
Tool Man ....

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