Metal hydraulic line burst B2400 Kubota: Loaders  -- Tractor Attachments Implements 3ph Discussion Forum and Review Metal hydraulic line burst B2400 Kubota: Loaders -- Tractor Attachments Implements 3ph Discussion Forum

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 10-19-2002, 08:26 Post: 43989
Pigtyme
2002-10-19 00:00:00
Post: 43989
 Metal hydraulic line burst B2400 Kubota

Just want some ideas on what could have caused this. This B2400 was purchased new in 1998 and has been used mainly for grass cutting. I added a LA352 loader about three months ago. The tractor only has 292 hours and has always been kept inside and maintenanced beyond recommendations. While using the loader to carry some rolls of sod a few days ago the loader started moving very slowly. Then I smelled hydraulic fluid and found it gushing from the left side of the rear pump where the metal hydraulic line connecting front and rear hydraulics bolts onto the drive pump, right under right side of drivers seat. It just seems strange to me that a metal line would fail with only 292 hours and right after installation of the loader. I don't know how it could have been damaged or if it was just a bad part to start with but you know that it was an expensive repair ... they had to take the tractor apart to get old one out and new one on.

Anyone had a problem or any ideas on the cause? I don't mind paying for repairs on something I did or wore out but I figured I paid for superior quality up front and should not have something like this go bad at such low hours on a pampered tractor ...






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 10-19-2002, 11:08 Post: 43991
Peters

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 Metal hydraulic line burst B2400 Kubota

The metal line should not break. The only reason that the line would break is if the line was damaged, rusted or had a defect in the forming at the factory. If there is no evidence of damage or rust I would look to Kubota for a replacement. Despite the fact it is out of waranty a safety problem like this need to be tract down as to the problem with supply and Kubota should replace.






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 10-20-2002, 21:57 Post: 44027
Pigtyme
2002-10-20 00:00:00
Post: 44027
 Metal hydraulic line burst B2400 Kubota

I questioned my dealer some more about this failure so I would have at least followed "chain of command" before contacting Kubota HQ. Dealer says he believes that pump was out of adjustment and over pressurized the line causing failure. Line was not externally damaged or rusted. My arguments are:

1) I did not know that you could adjust pump pressure and sure never saw it in my maintenance procedures. It is strange too that you can adjust a pump, which is full of seals and gaskets, to blow apart a metal hydraulic line. Does not sound like good engineering if true.

2) Wouldn't that be something the dealer should have checked when installing a new loader and changing hydraulic fluid just hours before the failure?

Interesting that new line does not follow path of old line. It has a "gentler bend". Makes me think trouble has surfaced before and has been reengineered. Anyway dealer says his hands are tied since tractor is out of warranty but wished me well in my contact with Kubota HQ. I did e-mail Kubota from their website and I am waiting for reply.

I love my tractor and have had nothing but good experiences with both dealer and Kubota up to now ... I will let you know what comes of this. Thanks ... Robert






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 10-20-2002, 23:15 Post: 44029
DRankin

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 Metal hydraulic line burst B2400 Kubota

You may grow old and grey waiting for Kubota to answer phones or E-Mails. I have been waiting for a return phone call for a month and an e-mail did receive an automated response after a 3 week wait.
My suggestion? Get the name of the area rep and call him every day until he calls back, or call the area distribution center and make a real pest of yourself.
But I still would not hold my breath while I waited if I were you.






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 10-21-2002, 06:53 Post: 44033
ThomasG
2002-10-21 00:00:00
Post: 44033
 Metal hydraulic line burst B2400 Kubota

As far as I know, pumps generally aren't adjustable, at least by ordinary maintenance routines. Max system pressures are usually set by a pressure relief valve rather than anything to do with the pump. I suppose the dealer could have meant the relief valve, and a stuck relief valve would raise an issue of over-pressurization. I suppose it's possible that installation of the loader could have interfered with relief-valve operation.

However, even if the relief valve isn't protecting the high-pressure line, design should be such that ruptured lines aren't likely. SAE standards in the '70's called for lines rated for four times systems pressures. If that standard were used, the lines should be rated in the vicinity of 10,000 lbs. I don't think that the gear-type hydraulic pumps generally used on tractors are capable of withstanding anything approaching 10,000 lbs.

This seems like a good place to repeat a hydraulics basic. Pumps don't develop pressure, loads do, and pumps are rated for how much pressure they can withstand. It would have been the loads of sod that produced high pressures, not the pump. Unless the loads were especially heavy for the loader, pressures shouldn't have approached a relief valve setting, let alone the pump's peak pressure rating, which should be a decent measure of max system pressure.

When the loader was working, you might have noticed if the relief valve was working. With especially heavy loads or a valve held open for a few seconds when the loader is at the limit of it's travel the relief valve should open and a scream should be heard. If you've heard that sound, then the relief is likely working and max pressure should be around 2,500 lbs.






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 10-21-2002, 07:16 Post: 44036
Art White

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 Metal hydraulic line burst B2400 Kubota

I haven't seen or heard of any problems that you have described. We did just do a service call on a leaky line from a loader installation but that is it. I would try and talk to the dealer support staff and find out who put your loader on and checked it over. I would be digging deeper.






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 10-22-2002, 17:01 Post: 44088
Pigtyme



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 Metal hydraulic line burst B2400 Kubota

Well Kubota did reply to my e-mail telling me that it has been transferred to its Southeast Support Division for consideration. I guess even that reply is encouraging. I am pretty hydraulic ignorant so I have to rely on what the dealer tells me and bring to you more knowledgeble board members his words for a "truth check". What he said just did not make sense to me even with my limited knowledge. I am sure that the loader was not overloaded with the sod though. I was hand loading the rolled pieces of sod and they were fresh and fluffy weighing only 20-30lbs each and could only get ten at a time loaded. Loader is working well again though and I still love my tractor ... put out 28 yards of mulch this morning with barely a sweat and no aching back. Tractor is still the best working toy I have and is a fine piece of equipment. I guess nothing is perfect no matter how it is built. I will keep you posted. Thank you all for information. Robert






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 10-22-2002, 18:03 Post: 44089
Peters

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 Metal hydraulic line burst B2400 Kubota

Stay at them either the dealer or Kubota has made a mistake one need to come clean.
If you consider the break force when you are loading earth from a pile, the sod in the bucket should not be a problem.
I loaded sod this summer and do not recall it being overly heavy. I certainly have had heavier loads of wet soil in the bucket.






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 10-23-2002, 08:13 Post: 44100
TomG2
2002-10-23 00:00:00
Post: 44100
 Metal hydraulic line burst B2400 Kubota

I guess it's pretty obvious that I don't think much of the 'over-pressured' explanation. I'd stay with the Kubota CS folks and maybe think that the dealer just used some convenient words. the works might not have come from a technical person.

Since the loader is now working, I would run the bucket to the limit of it's travel, continue to hold the valve open for a few seconds and listen for the relief valve. If the relief valve is working, there's virtually no possibility of pressures on the tube exceeding the system pressure. Irrespective of whether the system is obstructed and the relief valve stuck, components should be capable of withstanding the max pressure the pump could generate.

I also doubt that high-pressures from excessive loads were ever present. Keep in mind that pumps don't make pressure on their own. However, much higher pressures than the load itself can results from bumps hit while driving or dropped loads. However, the steel line is exposed to load pressures only while actually lifting. I suppose a lift or bucket could be made while the tractor was moving and a bump might be hit. A shock load would be generated. However, even if the relief valve was stuck, most loader valves have safety valves on the cylinder lines to protect against load shocks. 3PH's have safety valves as well, and typical safety relief pressures are around 3,200 lbs. compared to 2,200 lbs. for the system valve. If a loader valve is open, the safety valve would protect the steel line against high-pressure. Anyway, it's really stretching trying to reason that operation or even a combination of part failures could expose the line to pressures that it wasn't designed to withstand.






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 10-23-2002, 14:32 Post: 44109
Art White

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 Metal hydraulic line burst B2400 Kubota

When you are talking to your dealer have him reference his service bulletins on the B-2400 and he will find that there was an update that put an additional clamp and a longer collar to stop the vibrations from doing as you have.






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Discussion Boards > Active Subjects > Messages as Posted > Loaders Forum

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