i have a woods 1050 backhoe, the problem i have is when i pull handle to raise or lower boom , the boom creeps down until valve is all the way activated. any help would be greatly appreciated i have some knowledge in hydraulics.
thanks in advanced,
Buckeye Bob
Pics Join Date: Sep 2007 Location: West of Toronto Posts: 1303
re: problem with 1050 woods backhoe
Robert, I assume the "lever" is the boom up/down control, and I don't exactly get what happens when the boom sinks. But hydraulic seals do fail in time, usually requiring troubleshooting to locate where, and bringing that part to a hydraulics shop for a new seal.
Bob;
Welcome to the form, we try our best to help if we can, and sometime you likely can help one of us too.
I'm not familliar with your backhoe valve but have used other brand hoes. So far I haven't had to get into a valve, but I'd guess they all are pretty similar inside.
Perhaps a bit more description on the way ot acts would help. If I get it correctly when you move the control lever you have no function between creep and full speed? Is there some linkage between the lever and the valve spool that may have enough wear or an obstruction like a dirt buildup making the spool hard to move?
From there getting into the valve itself is something I haven't had to do yet on a backhoe, but I've had other valves apart. I'm sured there are "O" rings, springs, balls, etc. etc. that will jump out all over the place when it comes apart, so I hope you don't have to get into that.
Frank.
Okay i will try to describe my problem in more detail. when i try to feather boom up, the boom falls until i open valve all the way. In other words when I move boom control in the upwards position, just part way not fully up, the boom falls or creeps down until valve is fully activated. i hope this helps, if anyone needs more detail i will be watching the board.
thanks in advance
Buckeye Bob
Bob;
Ok, I'll make a couple assumptions here.
First - With the boom lever in neutral position the boom does not creep down? If so that rules out a cylinder problem and also rules out a sealing proiblem in the valve when in neutral position.
Second - Did this situaton happen all of a sudden or start a while ago then got worse as time went along?
If it hapened all of a sudden then I would suspect a broken "O" ring or a broken ball retaining spring if your valve uses them.
If this was a long time happening, then an "O" ring or rings loosing the ability to seal from wear or a valve seat or seats that need replacing.
OK, now I don't want to pretend to be an expert on backhoe valves. I have worked on remeote valves on farm tractors and have a pretty good understanding of them but a backhoe valve is designed to control the flow in a different way than a tactor remote valve, so I won't speculate much further.
Frank.
Frank or any hydraulic wizard out there. Maybe this will help, I have a link to the woods backhoe control valve assembly
http://www.messicks.com/Woods/7.aspx
There are shock/ dampening valves, check valve assemblies and a myriad of other hydraulic gizmos that I know very little about. This schematic should help those of you with a hydraulic background. To answer your question Frank, the boom does not drift down when the control handle is in neutral. I don't remember if this problem happened all of a sudden or over time. Thanks for everything,
Buckeye Bob
Sounds like a check valve for each up and down circuit may be opening or not closing fully. Or the spool is worn and fluid is leaking back through the down circuit. Try switching the up/down circuits at the valves or if easier at the cylinder and see if the situation changes. Report back.
Sounds to me like you've either got an 'open circuit' machine and 'closed circuit' hydraulics (or vice versa) problem, or you've got a 'power beyond' port going to the wrong place.
What you describe is often what happens when you get the plumbing a little scrambled.
It sounds like the flow is dumping to reservoir as is the return line, but before the pressure goes to the lifting side.
earthworks,if i flip hoses at the control valve and lets say the same problem exist,what does that tell you? this sounds like a good way to isolate the problem! thanks
I'm leaning toward what Murf said if nothing changes. If it does change then check the check valve cartridge(s) or switch them around. The machine will need to have a load or have gravity or pressure to duplicate since a cylinder that was used to pushing will now have to pull
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