Hydraulic hose problem

[GNB]

I have a problem with my Kubota B 2410 HST , it has a loader on it
I bought the tractor 2 weeks ago used of course and it has blown 3 hoses
on it, I change one and it blows another at the loader control stick, I am
new to tractors so do not know why it is blowing these hoses, today when
I went to get a new hose built the guy said that it maybe that the pump
is hooked up wrong, it just blew a small hose right behind the loader, hope
someone can help..
Thanks
BNG

 

[J_J]

Check your pressure with a 3000 psi gage.

New hoses are tested to at least double or triple the printed psi.

I think you just have some old hoses, sun dried and cracked casing allowing the wire to rust, etc.

 

[GNB]

Thanks I will check the psi
maybe I should just replace all the hoses only have 7 more to go...

 

[Discount Hydraulic Hose]

Check your pressure with a 3000 psi gage.

New hoses are tested to at least double or triple the printed psi.

I think you just have some old hoses, sun dried and cracked casing allowing the wire to rust, etc.

The news is even better than that. The ratio of minimum burst pressure to maximum working pressure is 4:1, so if your hose has 3,000 PSI on the layline, then it's been tested and proven not to burst at less than 12,000 PSI.

The only exception to this that I have encountered is hydraulic jack hose, which is rated for 10,000 PSI at NO IMPULSE. The NO IMPULSE is important, and the minimum burst pressure on those hoses is 20,000 PSI (a 2:1 safety factor, which they can get away with because there are no impulses in this application.

The OP, replacing all of the hoses may be the way to go here. If all of them are old and worn, then replacing just one or a few is only going to lead to the eventual failure of the others.

 

[rswyan]

I think you just have some old hoses, sun dried and cracked casing allowing the wire to rust, etc.

I have a B2910, possibly of similar vintage ... and I've got one loader hose that has started to split right at the QD at control valve ... so I'd say your assessment is entirely reasonable :thumbsup:

 

[J_J]

Have you checked the hose supply at.

Surplus Center

Hose and Tubing

 

[tcreeley]

I just bought a hose and fittings to replace a blown hose on my NH 7308 loader. I measured what was there and it looked like either a 7/8 wrench or a 22mm wrench. Seeing the tractor was a Shibaura made TC30, I got two craftsman 22mm wrenches. They were so tight I had to tap them on to use them. When I bought the hose, I picked up a couple of 7/8 wrenches. The fit is sloppy. There doesn't seem to be a middle ground. Somebody wasn't machining to specs. Anybody else running into this?
Tractor supply is not the place to buy hydraulic fittings- out of stock and staff are clueless. Now I figured out what I need, I can buy online.
Like the op is experiencing- one hose goes, the others are already lined up for their turn!
On the adapter's female pipe thread side, where it screws on to the hose's male pipe thread end- leave it dry? teflon? dope?
I always leave them dry- but I thought I would double check.

I am thinking of taking a grinder to the 22mm wrenches to improve the fit.

 

[J_J]

You need some kind of thread sealer on NPT fittings.

http://www.henkelna.com/us/content_data/141299_LT5557_5452SSF448695.pdf

 

[CJONE]

I just bought a hose and fittings to replace a blown hose on my NH 7308 loader. I measured what was there and it looked like either a 7/8 wrench or a 22mm wrench. Seeing the tractor was a Shibaura made TC30, I got two craftsman 22mm wrenches. They were so tight I had to tap them on to use them. When I bought the hose, I picked up a couple of 7/8 wrenches. The fit is sloppy. There doesn't seem to be a middle ground. Somebody wasn't machining to specs. Anybody else running into this?
Tractor supply is not the place to buy hydraulic fittings- out of stock and staff are clueless. Now I figured out what I need, I can buy online.
Like the op is experiencing- one hose goes, the others are already lined up for their turn!
On the adapter's female pipe thread side, where it screws on to the hose's male pipe thread end- leave it dry? teflon? dope?
I always leave them dry- but I thought I would double check.

I am thinking of taking a grinder to the 22mm wrenches to improve the fit.

I have a lot of customers try to tell me line size by what wrench they used. different manufactures use different size wrench hexes and now that the cheap import suppliers are getting into the game it is getting even worse. The problems you are having is directly related to no quality on the manufacturers end. If it truly is NPT then use a good PTFE high pressure sealant on the male thread. CJ

 

[tcreeley]

I got some sealer, put the ends on the hose with sealer, then put it on the tractor. The flare ends were fine, no leak. The pipe thread connection for the hose both leaked. I've used teflon and stick dope with with brass and copper in the past- used it right away and never a leak. Do you have to let these sealers cure before you put them under pressure by turning the tractor on? Had real slow drip -you could count to 10 between the drops. I kept tightening it, but no luck.