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Hydraulic couplings on a backhoe?

A

Anonymous-0

Well-known Member
I went to put the hoe back on my Cat. It was a pain because the hydraulic quick couplers had pressure on them and wouldn't couple until I loosened a fitting and let some oil out. I assume just from the hydraulics creeping that it's what's causing the pressure. Cat claims it takes 5 minutes to hook up. How can I set the hoe so it doesn't get pressure on the lines from creeping? Should the backhoe couplers be connected back together when the hoe is off the machine? I can't put the hoe right on the ground because the hoses aren't long enough. I shouldn't have to loosen a fitting and lose oil everytime I put the hoe on. Taking it off is easier and it's also easier to hook the hoses back together on the Cat when I take the hoe off. Any suggestions would be appreciated. Dave
 
When I used to take my hoe off I would put a big wood block under the center of the hoe and tri-pod the hoe ,than i would use the hyd's to move the hoe up and back from the tractor,than unhook the hyd lines. you do have to relieve the presure to hook them up again. I never lost more than cup full of oil....HTH...Jim in N M 504/620/3040
 
Sounds like your easiest and cheapest way out is to get a set of couplings that can be coupled and uncloupled under pressure. Any good hydraulic shop should be able to recommend a brand and size that can handle the flow and pressure needed for your application. Good luck.
 
I looked into that but was told even the ones that are supposed to couple under pressure don't always work right. Dave
 
I had a stump under it but the boom cylinder still creeped. I think maybe if I put a chain connecting the 2 stabilizers together that it would help. It would stop the stabilizers from creeping and maybe the boom cylinder as well. I guess I'll to experiment. I thought someone might have a manual that explains how to do it. Dave
 
I don't know if it makes any difference, but I have the male connectors on both of the lines connected to the backhoe, and females on the crawler. I've never had a problem reconnecting. I do relieve all the pressure I can after I have the unit off by resting things in a stable position, but of course the stabilizers must still have pressure.
 
the only time i have trouble is if it sets out in the sun and gets hot the oil will build pressure and thats only on the hoses on the hoe end
 
The hoe on a 931 needs to have one of each couplers on hoe and tractor. You need to connect tractor lines together or the main valve can't exhaust oil and the loader lift will not work. Badly worn locking groove will also give this problem.
Later Bob
 
I put new couplers on. You have to have a male and female end on both the hoe and Cat or you can't reconnect the hoses. It could be from sitting in the sun like Marlowe said but I think I need to figure out a way to relieve all pressure on the hoe and stop it from creeping over time. I don't have much problem hooking the hoses back together on the Cat after I take the hoe off. There's not a lot of room to get into to connect the hoses and when they don't couple it's just a pain. I thought there might be a special technique for parking the hoe. Thanks to everyone for the help. Dave
 
You have to hook the hoses back together so if the hoe settles it will balance the lines,and not pressurize a fitting. Probably your best option would be to get longer hoses made so you can connect the hoe to the tractor when the hoe is on the ground,and hook the hoses on the hoe together when it is dismounted.
 
Thank you. I've only had the hoe off a couple times and didn't reconnect the hoses on it. That's kind of what I was wondering. I can reconnect the hoses on the Cat even if I don't have the loader bucket on the ground. The loader is so much more maneuverable without the hoe on the back. A little tippy with a heaped bucket of wet clay though. Dave
 
I disconnect my backhoe leaving the hoses connected, then extent the feet to raise it up a little and set cement blocks under the frame, then raise the feet just enough to take the weight off of them, then disconnect the hoses.
Then I plug the 2 hoses into each other, to keep the dirt out.
My guess is that one of your valves leaks a little, letting it settle, pressureizing your hoses.
 
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