Finally, Hydraulic Backhoe Stabilizer Locks, Lift and Lock,

[WaxMan]

I hated every time I go to drive out of the garage. I have to start the tractor go in back and put up the backhoe stabilizers and get back in the cab.
I want to get in hit the garage door opener and drive out.

Backhoe Stabilizers Bleed Down, Why didn't I think of this, before.

I did a nice job on my stabilizer locks for the Woods backhoe outrigger on my b3030. Spring loaded, baked on paint finish, auto disconnect, ,stainless steel pins, handy ready to lock at any time.

I really wanted to do something along the same line for my BH92 backhoe.

I looked at it, studied it, held pieces of metal up to it , but nothing lines up right like on the Woods backhoe. I was puzzled, how was I going to make this outrigger lock system on my BH92 backhoe. No way I'm going to tie them up each time with ratchet tie down straps, ropes then untie them every time I want to use the tractor.
About to give up
Then it came to me, why not just stop the fluid from escaping the piston.
While they were up I loosen the bottom line to the cylinder no fluid came out. Then I loosen the piston side and fluid came out the outrigger started to drop, so

I ordered two high pressure 1/4 inch hydraulic shut off valves for 18.00 each and 4 fittings, From Surplus Center Installed them at the piston end of the cylinders.

Problem solved, Two days now and still up tight. Normally they drop pretty quick, overnight they are down quite a bit. Now just Lift the stabilizers and lock them. It was that easy. It sure beats getting out the rope, chain, tie downs etc. Don't have to worry about breaking anything if you forget to unlock it.
I would have liked to make something like I did on the B3030 backhoe, but this is quick and seems to work.

 

[FatTire]

That's a great idea. I park outside so I don't care if they drop a few inches, but for the garage, this would be great.

 

[rich bx]

You really are a brilliant genius Waxman, your ingenuity is inspirational, keep it up , please...

 

[kcender]

Nice modification,looks factory.

 

[WaxMan]

Thanks FatTire,rich bx and kcender for your comments.
I will keep it up rich bx just because you asked, thanks.

 

[rich bx]

cool, can't wait to see the next brain storm : )

Thanks FatTire,rich bx and kcender for your comments.
I will keep it up rich bx just because you asked, thanks.

 

[techman]

Be very careful with this idea. If the valve is left closed and you try to lower the stabilizer with the hydraulic valve you will intensify (multiply) the pressure in the rod end of the cylinder. The pressure will rise to the tractor max pressure times the area ratio of the cylinder, typically 2:1. This relates to 5000-6000 PSI in the rod end of the cylinder which is well beyond the working pressure. It will likely not "blow up" the cylinder, but would possibly blow out the rod seal. A properly designed hydraulic circuit has a relief valve on the rod side when a shut off valve is installed. It is referred to as an "intensification relief" and protects from high intensified pressure.

paul

 

[WaxMan]

Be very careful with this idea. If the valve is left closed and you try to lower the stabilizer with the hydraulic valve you will intensify (multiply) the pressure in the rod end of the cylinder. The pressure will rise to the tractor max pressure times the area ratio of the cylinder, typically 2:1. This relates to 5000-6000 PSI in the rod end of the cylinder which is well beyond the working pressure. It will likely not "blow up" the cylinder, but would possibly blow out the rod seal. A properly designed hydraulic circuit has a relief valve on the rod side when a shut off valve is installed. It is referred to as an "intensification relief" and protects from high intensified pressure.

paul

I thought is was too easy, Nothing is that easy, Thank you for telling me that. Anybody wanting to do this should know that information.

AND NOT DO IT AT ALL, unless they understand the risks.

So with the valves closed operating the tractor would not be a problem?
The only time there would be a problem is trying to lower the outriggers with the shut off valve on? Holding the lever down.


In your opinion how long would you have to hold the levelers down with the shut off valve on before max pressure builds up?
Because I did try it after installation and it sounded just like it does running the piston all the way out to stop like a relief was working.

Boy that would have been something pop and the seal pops off, Glad you told me won't do that again.
I have read things if you put a metering valve on and slow the flow the pressure would build up. I guess stopping the flow all together the same things happen.
So the relief is on the rod side only? Is there another way to do it?
Thank you very much for that important information.

I was going to post No more erectile dysfunction for my backhoe outriggers.
Still erect after 4 days

 

[Gary Fowler]

Be very careful with this idea. If the valve is left closed and you try to lower the stabilizer with the hydraulic valve you will intensify (multiply) the pressure in the rod end of the cylinder. The pressure will rise to the tractor max pressure times the area ratio of the cylinder, typically 2:1. This relates to 5000-6000 PSI in the rod end of the cylinder which is well beyond the working pressure. It will likely not "blow up" the cylinder, but would possibly blow out the rod seal. A properly designed hydraulic circuit has a relief valve on the rod side when a shut off valve is installed. It is referred to as an "intensification relief" and protects from high intensified pressure.

paul

This makes no sense at all. No way can you "intensify" hydraulic pressure beyond the pumps relief valve. With the valve shut, it would be no more that holding down the valve after the cylinder reaches it max extend range, then all the oil would simply by-pass at the relief valve.
Where do you guys come up with this non-sense.

 

[J_J]

Be very careful with this idea. If the valve is left closed and you try to lower the stabilizer with the hydraulic valve you will intensify (multiply) the pressure in the rod end of the cylinder. The pressure will rise to the tractor max pressure times the area ratio of the cylinder, typically 2:1. This relates to 5000-6000 PSI in the rod end of the cylinder which is well beyond the working pressure. It will likely not "blow up" the cylinder, but would possibly blow out the rod seal. A properly designed hydraulic circuit has a relief valve on the rod side when a shut off valve is installed. It is referred to as an "intensification relief" and protects from high intensified pressure.

paul

If a shutoff valve is in the work port, and you shut it off with the cyl raised, where are you getting the fluid to make the cyl do anything?

If a work port is shut off, and you move the lever, the relief will activate as in any circuit that is blocked.

Placing a shut off valve in the work ports is about the only way to stop fluid flow.

Pilot operated check valves might also work.