Trouble hooking up Bobcat backhoe, pressure wont release

[azbinder]

That's the reason connecting the hoses to each other. It helps with equalizing the pressure. Also, work all the control levers before disconnecting the hoses at the bh.

 

[Smokeydog]

Clamp I made for flat face connectors. Doesn’t take much pressure, just more than I can do by hand.

 

[Halfcoyote]

A common problem if not handled properly. Let me see if I can do a step by step.

#1- Find a solid, level place to dismount your bh.
#2- Lower the bh boom and stabilizers to the ground. If you don't want to lower the stabilizers, tie them up so they will not lower on their own or if someone moves the lever.
#3- Once the bh is on the ground and solid, SHUT OFF the tractor.
#4- Move all the control levers to relieve pressure in the connecting hoses.
#5- Disconnect both bh hoses from tractor and IMMEDIATELY connect to each other.
now you are able to use the tractor.

When installing the bh:

#1- Back up to the bh and SHUT OFF tractor. Move all hydraulic control levers on tractor to relieve any pressure.
#2- Before disconnecting the bh hoses move all bh control levers in all directions to equalize any built up pressure.
#3- Connect bh hoses to tractor and start tractor.
#4- Finish mounting bh to tractor.

Please note that I'm not trying to be a wise guy, but I have worked in dealerships and have done my fair share of installing loaders, backhoes, TNT kits and remote hydraulic valves. All I can say is that if pressure is NOT relieved, you will have a very difficult time reconnecting couplers. It MUST be done with the tractor SHUT OFF.

Thanks, That's what I've tried to do. The first time I made the mistake of thinking the backhoe could sit on the stabilizers and boom like a tripod, yes, bad idea. Since then, I do what you say, but still get pressure built up. I don't do #5, I have 3 hoses to my backhoe.

 

[LD1]

The pressure can build up if you unhook the backhoe when its full of cold oil or on a cold day.

Then you try and reconnect on a hotter day or with sun beating down on the black hoses. The fluid gets warm and tries to expand. That builds pressure.

Do as you are now....shut off tractor and cycle all the levers to bleed everything that way gravity isnt causing pressure after unhooking.

Then after unhooking.....reconnect to the tractor (with the tractor still off) a few times and disconnect again. This lets a few more drops of oil bleed out of the system each time and is usually just enough to ease re-install when the time comes

 

[Smokeydog]

Ken’s hooks sells a “Waite” tool to relieve pressure from an attachment by depressing the qa fitting. Got one to try, works and small enough to fit in a tool box. Not hard to make something similar. Even with the best preventative techniques still attachments can build pressure sometimes. I like the bar clamp because no fluid loss.

Used the wack the Parker poppet method for decades on hydraulic haying equipment. Used brake cleaner or WD40 to clean female QAs. Messy and dirty. Have switched to flat face for most things now. Much easier to keep clean. Tractors have changed too. HST and more hydraulics to keep clean fluid.

 

[Fxfymn413]

After seeing this thread I did a search for tools to solve this problem and of course they are out there. I like the QC-Mate 12-in Hydraulic Quick Coupler Connect Under Pressure Clamp. Very pricey IMO, but a pretty elegant solution. Very similar to what Smokeydog made, but uses a quick clamp instead.

 

[Diggin It]

Interchangeable heads. About $5 at HF and other places. Wood dowels are cheap too. No need for fancy expensive doohickeys.

If you're a farmer, or working on machines and think dirts and oils are ickey .... well .... there are rags.

KISS


Keep

It

Simple

Stupid.

(Or stupid simple works too.)



Or, and as to the level ground crack? I don't have any.


"You gotta do it this way and you gotta buy this pricey gizmo. It's the only way!!!!"


No, YOU might gotta do it that way and YOU might have unlimited resources to buy a billion special purpose gizmos, but not everyone does. And there are like a thousand different ways to do everything. Adapt.

 

[Fxfymn413]

No, YOU might gotta do it that way and YOU might have unlimited resources to buy a billion special purpose gizmos, but not everyone does. And there are like a thousand different ways to do everything. Adapt.

Wow! Didn't realize I was striking a nerve. Sorry.