b3030 blew a hose at 53 hrs

[workinallthetime]

blew a hydro hose on my backhoe tonight, wondering if it was just a bad hose or something i did. I was tearing through a root when it happened.
i think it will be more of a pain to send it to the shop then if i just fix it.

any thoughts?

 

[art]

Depending on the fluid loss, you will need some more. Hoses are easy to change with the right tools.

 

[workinallthetime]

got the fluid and a box full of tools begging to be use

 

[RonMar]

I doubt it was something you did, unless you physically damaged the hose material while ripping out a stump or hanging the hose up on an obstruction. The safeties in the system should keep the pressure below the hose pressure rateings. That being said, hoses do flex and wear out, but I would not think this likley at only 53 hours. Where did the hose fail, middle or end? Could have been a production flaw in the hose, could have been a bad crimp/assembly of a hose end. Do you have a pressure gauge on the backhoe circuit? That will tell you if your safety valve or valves are set correctly. If they are set correctly, it is probably just a production flaw. At only 53 hours, any chance of a warranty replacement hose from the dealer/manufacturer?

 

[workinallthetime]

I doubt it was something you did, unless you physically damaged the hose material while ripping out a stump or hanging the hose up on an obstruction. The safeties in the system should keep the pressure below the hose pressure rateings. That being said, hoses do flex and wear out, but I would not think this likley at only 53 hours. Where did the hose fail, middle or end? Could have been a production flaw in the hose, could have been a bad crimp/assembly of a hose end. Do you have a pressure gauge on the backhoe circuit? That will tell you if your safety valve or valves are set correctly. If they are set correctly, it is probably just a production flaw. At only 53 hours, any chance of a warranty replacement hose from the dealer/manufacturer?

hose "split" about 6 inches from any coupler, hose went to curling cylinder on bh. blew out under use. tractor was bought as a tlb from kubota in april, i think.

 

[hill]

Do you have any accessory hydraulics such as a grapple on your loader?

Reason I ask is that there is a caution in an instruction I got with a W.R. Long kit warning that any added hydraulic system plumbed downline of a backhoe may cause excessive pressures in the backhoe valve and or hoses. Although it doesn't say why I assume it means that it would be possible to apply line operating pressure to parts of the valve not designed to hold so much, the return circuit which would normally not be subject to the high side pressure.

It's all pretty mysterious to me so during the install of that kit I realized that I had no idea whether a 'power beyond' outlet is high side or low side, and it seems to me that it could be either depending on which side of a valve is connected to the source pump output.

But that's how stupid I am about this stuff. It may have nothing to do with your blown hose but it should engender some corrective statement that'll help us both. (instead of "learn by doing" make "learn by fishing" your safer course to enlightenment )

 

[workinallthetime]

nothin added on yet, still just a plain ole tlb

 

[john_bud]

The thing about hoses is they blow. I had one on the Kubota bucket curl blow with a huge gyser when I quick dropped a full bucket. Had done the exact same thing for 6 years with no problem and whammo! A major bucket line blew on my Ford when it was new to me. Shot fluid out like a rocket when it blew (max lift - naturally) and continued to spew as the FEL dropped. That one scared me as the 2000+ psi fluid went right past my head. It got new hoses the next day - any hose that was routed near me is now new.

jb

 

[Soundguy]

If kubota is making all it's hydro hoses like it makes it power steering (will-fail) hoses.. then i expect this to be a common type of thread here in this forum.

I expect hoses to fail every now and then.. I don't expect them to 'need' to be replaced at oil change intervals though...(wink)

That orange japanese rubber must be made in china or something (double wink )

soundguy

 

[dillo99]

My Kubota has about 240 hours on it and I have blown three of the loader hoses - I think the first one went at about 75 hours. I had new ones made at a local place that makes some serious stuff (for very big equipment). I noticed that their hose seems much stronger than those that I replaced. My guess is that the new hoses will last much longer than the stock Kubota ones.

 

[RonMar]

I would imagine in most corporations that produce anything these days, Accountants are a major part of the engineering/design team...

 

[workinallthetime]

$13.10 and all of 10 minutes
the factory hose had the name ANCHOR printed on them, and even in english.

 

[Soundguy]

I would imagine in most corporations that produce anything these days, Accountants are a major part of the engineering/design team...

Yep.. some bean counter somewhere point out that they could start using hoses made by supplier 'B', and save 1.5 cents per gross.. and only degrade lifespan by 70-80%.. but that those hoses would almost deffinatly hold till the machine was driven off the dealers lot.

bean counter probably got a promotion out of it too..

soundguy

 

[diyDave]

If they keep breaking, you might want to check your relief valve pressure setting, but for one hose, I wouldn't worry too much. It's when it becomes a habit, that would make me check it more extensively.

 

[Volfandt]

the factory hose had the name ANCHOR printed on them, and even in english.

Hate to say it but Kubota makes some, if not most of it's North American marketed implements & attachments at their plant in GA, USA.
The BX is manufacted there w/only the engine & HST imported from Japan and although the B series is imported, I believe the MMM's, FEL's & BH's are made in the GA plant also.
I also think it's a bean counter induced early failure rate.

 

[dangier_VA]

My experience working with hydraulics, hoses are bound to blow at times. I blew the main pump hose on my 3130 at 9 hours. Looked to be from a kink when the unit was crated. I had actually looked at it when delivered and commented to the driver. After it blew, it was replaced under warranty with 5 gallons of fluid. I just had to clean up the mess in the neighbor's gravel driveway (just missed his flower garden-whew). I later had an assortment of 4000# hoses made up for future needs. Nice to have a selection available for misc. projects too.
Regards,
David

 

[Soundguy]

Hate to say it but Kubota makes some, if not most of it's North American marketed implements & attachments at their plant in GA, USA.
The BX is manufacted there w/only the engine & HST imported from Japan and although the B series is imported, I believe the MMM's, FEL's & BH's are made in the GA plant also.
I also think it's a bean counter induced early failure rate.

But do they manufacture their own hose, or even assemble the hoses from components.. or do they outsource the hoses?

Where ever it is.. they have a problem some where and apparently don't care about it as long as the orange customers keep coming in and buying orange tractors and orange 'will-bust' hoses from them.

I like Nh and all.. but if i bought a part from them that kept failing and I could get that part made at napa.. I would do so... oils to expensive to blow out on the ground.. not to mention the down time..

Soundguy

 

[Wayne County Hose]

Hi guys, I'm new here but I hope I can help. Anchor hose and coupling is an old and respected company. I don't know about their new stuff, but the old stuff was quality. They still do a lot of O.E.M work for major manufacturers such as Kubota and Caterpillar. Even though I am a distributor for a competitor, I can say that Anchor's stuff is not junk.
Hoses blow for many different reasons. I have seen weak batches of hose. It happens, no manufacturing process is perfect. The hose could also have been installed improperly. A 5 degree twist in a hose will reduce it's life by up to 90%.
Many manufacturers use one wire hose to get them through the warranty period. Two wire is only about 25% more expensive but usually on an application like this will last infinitely longer. On a tractor, I universally install two wire unless the customer requests otherwise.
The main thing is for your hose man to identify why the hose burst. Was it excessive pressure, twisting, bent past minimum bend radius? Wherever you get your hose made, they should be able to answer this. If they can't most of the time, go somewhere else.

 

[J_J]

The thing about hoses is they blow. I had one on the Kubota bucket curl blow with a huge gyser when I quick dropped a full bucket. Had done the exact same thing for 6 years with no problem and whammy! A major bucket line blew on my Ford when it was new to me. Shot fluid out like a rocket when it blew (max lift - naturally) and continued to spew as the FEEL dropped. That one scared me as the 2000+ psi fluid went right past my head. It got new hoses the next day - any hose that was routed near me is now new.

Job

Maybe you have already figured out what happened. This may be a logical explanation for what happened. When you drop a heavy load, and pop the valve to neutral before it hits the ground, the load weight/force is being sent to the cylinder, which is now acting as a pump. The hydraulic pressure generated can exceed the burst pressure of the hose, and or cylinder. You say that you have done this many times, however it is not a good idea to try and catch a load. I am thinking that this will weaken the hose, and other components, and it will reach a burst pressure and explode. I have cracked a fitting on a cylinder hose by doing the same thing. I have a pressure gage hooked up on my cylinders, and I can see the spikes that are generated sometimes. A similar situation can happen when people drive fast into a pile of dirt in order to get a good load. The ram effect will apply in this situation also.

 

[john_bud]

J.J.

Your explaination makes sense. The actual circumstances were a little different. The exact action was dumping the bucket over the edge of a spoils mound. Raise the FEL as the mound is approached, reach the mound as the FEL raises to the correct height, snap the lever to dump and hold it there until the bucket reaches full dump position and hits the stops to rattle off the stuck mud/dirt. The failure was at the crimp, but was the hose. The hose in question goes from the hard line to the upper cylinder port that has the least motion. It is in a hard sharp 90 degree bend, but nothing out of this world.

So, while the actions were a bit different from your example, the reactions of hose pressures and such were probably pretty similar. Replacement cost was under $20 and under an hour from the time the hose blew to the time it was back in service. Yes, There is a good hose guy in town!

jb