Help with BH92 Hydraulic Hose

[invisibleotis]

I'm sure this is answered somewhere but I've owned a tractor less than a year (my wife says I'm cosplaying) and I can't find the right keywords to understand what's going on here.

On my BH92 backhoe, one of the hydraulic hoses that controls the left/right boom started to come undone and was spraying fluid everywhere. I originally thought it had just come loose, so I tightened it again, but as you could expect, when I move the boom left/right, it instantly loosens* the nut to the point where I can easily spin it with my hand.

Before you comment, this picture was just to get the tractor back to the where I park it, when I first tightened it, I kept the hose pointing directly forward and it still came loose.

 

[Russell King]

That is an odd problem!

The hose (probably) has a female JIC swivel fitting on its end that screws onto a port adapter in the cylinder. The fittings have a tapered metal connection to seal the hydraulic fluid pressure. They are generally very easy to attach and tighten up easily. There is probably some proper torque value but I just snug them together with two wrenches (one on the adapter so it doesn’t turn, and one on the hose end) until it is “tight”.

Clean up the area to get the dirt away from the fittings..

Looking closely at your picture the right hose seems to go onto the fitting much further than the left fitting. That makes me think that is not the proper adapter fitting tee into the cylinder. But since it has been working for a year that would be odd.

Please take the hose completely off the fitting and use some clean rags to wipe everything clean, take pictures if possible. It will probably be dripping oil out so put down a catch pan and you may want someone else to help take pictures since your hands will be oily and you will probably want to get it back together quickly.

I am asking @TheOldHokie to chime in since he has much more experience and knowledge about this stuff than I do. Hopefully he will be along soon.

 

[TheOldHokie]

Disconnect the hose and slide the nut rearward as shown below. Inspect the threads and the flared seat for signs of dammage. Do the same for the male fitting on the cylinder. If no damage found reattach the hose by first placing the flared seat squaely against the male flare on the cylinder. Then slide the nut up and tighten hand tight making sure the nut is not cross threaded and the female flare stays square to the male flare. Once hand tight tighten securely with a wrench.

Dan

 

[PoTreeBoy]

The BH92 is similar to the BT900 used on the L35. Those hoses get pulled pretty hard when the hoe is fully swung. One member used heavy tie wraps around the cylinder to help. You have to tighten those pretty snug.

I seem to have a little drip back there, need to crawl under. Thanks for the reminder.

 

[TheOldHokie]

The BH92 is similar to the BT900 used on the L35. Those hoses get pulled pretty hard when the hoe is fully swung. One member used heavy tie wraps around the cylinder to help. You have to tighten those pretty snug.

I seem to have a little drip back there, need to crawl under. Thanks for the reminder.

Use the "flats" method for best results:

1. Align the flares and tighten with a wrench until light resistance is felt
2. From that point tighten 1-1/2 flats for a JIC-08 tube nut.

Dan

 

[invisibleotis]

Thanks everyone, this is my first experience in this forum and I'm so grateful for the help. Brings me back to the old forum days I used to love 25 years ago . I only go to our property on the weekends at this rate so I will try out the suggestions on Saturday and update here.

 

[Russell King]

The BH92 is similar to the BT900 used on the L35. Those hoses get pulled pretty hard when the hoe is fully swung. One member used heavy tie wraps around the cylinder to help. You have to tighten those pretty snug.

I seem to have a little drip back there, need to crawl under. Thanks for the reminder.

@invisibleotis

Before you take it apart, it would be a good ideal to swing the hoe fully in both directions to see where they might be hitting the static frame. Then arrange the hoses a bit inside that limit. Then you could probably use a wide Velcro strap to hold the hoses together if that is necessary. (I don’t like using wire ties on hoses since they can wear through the hose casing.)

https://www.amazon.com/Wrap-Heavy-Duty-Storage-Straps-Large/dp/B01N6VG9YY

The hose could be limited in its travel and acting as a lever to loosen the nut on the flared end as you use the backhoe.