Bought a used b7100 - has a hydraulic leak

[baxfin]

Hey all - thanks for taking the time. I am a very new tractor owner and I know very little about hydraulics and tractors in general. I bought a used b7100 - it was not leaking at all when I purchased it. After it arrived at my place, I noticed it starting to leak hydraulic fluid out of a fitting. Now it basically pours hydraulic fluid out of this fitting. I made sure that it is tight and it still leaks. Please see attached picture - the leak comes from the green arrow location which is between a female hex fitting and a longer hexagonal piece of metal that is perpendicular to the hose coming in. If I unthread the hose from the female fitting, the female fitting spins freely in place meaning it is not threaded to the hexagonal piece of metal. I am assuming as I thread and tighten the hose into the female fitting, it should tighten in place.

Anyways, I am almost certain I need to replace something here. Can anyone provide any pointers on how I can figure out what I need to replace and where I can buy those components? Thanks again

 

[TheOldHokie]

Hey all - thanks for taking the time. I am a very new tractor owner and I know very little about hydraulics and tractors in general. I bought a used b7100 - it was not leaking at all when I purchased it. After it arrived at my place, I noticed it starting to leak hydraulic fluid out of a fitting. Now it basically pours hydraulic fluid out of this fitting. I made sure that it is tight and it still leaks. Please see attached picture - the leak comes from the green arrow location which is between a female hex fitting and a longer hexagonal piece of metal that is perpendicular to the hose coming in. If I unthread the hose from the female fitting, the female fitting spins freely in place meaning it is not threaded to the hexagonal piece of metal. I am assuming as I thread and tighten the hose into the female fitting, it should tighten in place.

Anyways, I am almost certain I need to replace something here. Can anyone provide any pointers on how I can figure out what I need to replace and where I can buy those components? Thanks again

The hose is connected with a female pipe swivel. it spins freely until tightened on the hose.

Where is your leak - swivel joint or where the elbow screws into tractor?

Dan

 

[baxfin]

The hise is connected with a female pipe swivel. Ot spins freely until tightened on the hose.

Where is your leak - swivel joint or where the elbow screws into tractor?

Dan

Thanks for the quick reply - the leak is at the swivel point

 

[TheOldHokie]

Thanks for the quick reply - the leak is at the swivel point

The swivel joint has a male cone seat and the nut pulls that seat tight to a matching female chamfer on the end of the hose. Sounds like the seat and/or chamfer are damaged. Disconnect the hose and inspect the sealing surfaces. They should be shiney and smooth.

Dan

 

[Russell King]

I can’t easily locate a fitting exactly like what you show but this one is similar

https://us.misumi-ec.com/vona2/detail/221004967258/?CategorySpec=00000071152%3a%3aa&list=PageCategory&Tab=codeList&curSearch=%7b%22field%22%3a%22%40search%22%2c%22seriesCode%22%3a%22221004967258%22%2c%22innerCode%22%3a%22%22%2c%22sort%22%3a1%2c%22specSortFlag%22%3a0%2c%22allSpecFlag%22%3a0%2c%22page%22%3a1%2c%22pageSize%22%3a%2260%22%7d

As you see it could be leaking at three places. 1 where it screws into the tractor,2 where the hose screws into this fitting and 3 where the hex swivel is loose there is a second cone seal .

I would take the fitting to a hydraulic shop and get a replacement IF you are somewhat mechanically inclined.

 

[TheOldHokie]

I can’t easily locate a fitting exactly like what you show but this one is similar
View attachment 138680

https://us.misumi-ec.com/vona2/detail/221004967258/?CategorySpec=00000071152%3a%3aa&list=PageCategory&Tab=codeList&curSearch=%7b%22field%22%3a%22%40search%22%2c%22seriesCode%22%3a%22221004967258%22%2c%22innerCode%22%3a%22%22%2c%22sort%22%3a1%2c%22specSortFlag%22%3a0%2c%22allSpecFlag%22%3a0%2c%22page%22%3a1%2c%22pageSize%22%3a%2260%22%7d

What makes you think that outlet block is BSPP? My guess is NSPF or possibly NPTF and the elbow is NPTF x NPTF.

Dan

 

[Russell King]

What makes you think that outlet block is BSPP? My guess is NSPF or NPTF.

Dan

I said it was SIMILAR and used it as an example of what might be leaking since that was part of the original question. No where is there a suggestion that it is the SAME threads as what is installed.

 

[TheOldHokie]

I said it was SIMILAR and used it as an example of what might be leaking since that was part of the original question. No where is there a suggestion that it is the SAME threads as what is installed.

Well I will go further and say this has the correct threads and can be purchased at your local TSC. But before replacing it make sure the original is actually defective. Those things tend to be pretty robust.

Dan

1501-06-06 | 3/8" NPTF Male x 3/8" NPSM Female Swivel 90°

Check out the deal on 1501-06-06 | 3/8" NPTF Male x 3/8" NPSM Female Swivel 90° at DiscountHydraulicHose.com

www.discounthydraulichose.com

 

[Russell King]

There are shops in your state that are like this one that can provide you with the correct fitting.

Hydraulic Hose Fittings | Hydraulic Adaptors | Norwest Hydraulics

Hydraulic hose fittings are used to connect hydraulic hoses, tubes, and pipes to pumps, valves, cylinders and other parts of the hydraulic system.

www.norwesthydraulic.com

And as Dan (so politely) pointed out, there are way too many thread types involved in the hydraulic world to venture a guess what you need over one picture on the internet.

I personally avoid using any NPT type of thread in hydraulic systems if at all possible. I much prefer the JIC CONE or straight thread with a sealing washer (ORB or BSPP )

 

[TheOldHokie]

There are shops in your state that are like this one that can provide you with the correct fitting.

Hydraulic Hose Fittings | Hydraulic Adaptors | Norwest Hydraulics

Hydraulic hose fittings are used to connect hydraulic hoses, tubes, and pipes to pumps, valves, cylinders and other parts of the hydraulic system.

www.norwesthydraulic.com

And as Dan (so politely) pointed out, there are way too many thread types involved in the hydraulic world to venture a guess what you need over one picture on the internet.

I personally avoid using any NPT type of thread in hydraulic systems if at all possible. I much prefer the JIC CONE or straight thread with a sealing washer (ORB or BSPP )

I share your dislike of NPT but you can't put a male BSP fitting in a female NPT port and expect it to work reliably.

Kubota has been very consistent on the threads used in those blocks. The only ones I know of that have ORB ports are the ones I make. In the US they are NPSF with NPTF adapters. Measure the male thread if in doubt.

Also expect problems getting a new elbow to clock and seal properly in that now deformed port. I woukd switch to a straight NPTF male x JIC male adspter and put a female NPTF x JIC female swivel elbow on the hose. You wont have to worry about clocking the pipe threads.

JIC 8 Male x 3/8" NPT Male Straight 2404-08-06 Adapter | JIC Male to NPT Male - Straight | JIC to NPT | Hydraulic Adapters & Fittings | Hydraulics | www.surpluscenter.com

JIC 8 Male x 3/8 NPT Male Straight 2404-08-06 Adapter, JIC Male to NPT Male - Straight, JIC 8M x 3/8 NPTM CONNECTOR, JIC 8 Male x 3/8&quot NPT Male2404-08-06,

www.surpluscenter.com

90° Elbow, 3/8" NPTF Female x 1/2" JIC (3/4"-16 thread) Female Swivel | 6503 | Hydraulics Direct

Hydraulics Direct manufactures thousands of hydraulics products including stainless adapters, hose end fittings, valves and instrumentation fittings

www.hydraulicsdirect.com