Hydraulic Stop Valve: John Deere Review  -- John Deere Tractors Discussion Forum and Review Hydraulic Stop Valve: John Deere Review -- John Deere Tractors Discussion Forum

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 08-24-2001, 10:57 Post: 31258
Bruce W.



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 Hydraulic Stop Valve

Can anyone help me figure out what the hydraulic stop valve is used for? When does it need to be fully open or fully closed? I've got a JD MX-5 brush cutter and a front loader on the tractor. I ran the brush cutter for the first time the other day and my hydraulic hoses to the loader valves became very hot. I can't move the stop valve, "rusted"?, but have applied something to unfreeze it. Any help would be appreciated. Thanks.






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 08-24-2001, 11:50 Post: 31259
Murf



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 Hydraulic Stop Valve

Bruce, I can only assume from your description that by "stop valve" you mean the screw valve which adjusts (or stops) hydraulic flow to the 3pth. If this is what you mean, it is there so that you can adjust (usually because of varying weights) the speed at which implements mounted on the 3pth actually drop at, irregardless of the speed that the control is moved. This way heavy objects, like your brush-cutter, don't slam inot the ground if you move the lever to fast. These valves do tend to get a little stiff if not used regularly (and not many do), gently move it back and forth, it will loosen up, but don't use more than firm pressure, if you break the stem off you will be really .... annoyed. As for the temperature of the hydraulic lines, don't worry, it is normal for the lines to get hot to the point you don't want to hold them for long, this is just the fluid doing it's job, keeping your transmission, differential and pto cool, and lubricated. Best of luck.






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 08-24-2001, 13:33 Post: 31264
Bruce W.



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 Hydraulic Stop Valve

Thanks for the info. I'll make sure to try a free it up gently. I am wondering about the rate of drop issue. My tractor is a JD 950 and it has another small valve with a lever handle, located under the seat. The manual says is used to control the rate of drop. I've been able to work this one free, but have not tested the rate of drop yet. The manual says that if you turn the lever towards the front of the tractor, then the rate of drop will be slower. I've also heard that the stop valve can be used to heat up the hydraulic fluid when its cold out by closing it for a short time and forcing the fluid past the relief valve.






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 08-25-2001, 06:18 Post: 31270
TomG

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 Hydraulic Stop Valve

The difference between normally hot and over-heated is a little tough to call over the net. Murf probably is correct, but I would keep in mind that an obstructed or overworked hydraulic system can over-heat the oil which can damage things. If the hydraulics seem to have low power or speed, I'd listen to see if the relief valve is open or if the hydraulic pump buzzes or rattles. If the oil heats when using the rotary cutter but not the loader, there's a chance the cutter is large for the tractor and the flow-control valve is fairly closed down. In that case, the hydraulics would be heavily worked and the oil would heat.

I haven't heard the term 'stop valve' before. Since there seems to be another valve identified as the flow-control valve, I wonder if the stop valve is what I call a diverter valve. On many tractors, a diverter valve selects between remote (3ph) and auxiliary hydraulic systems. The auxiliary system provides a external feed and the auxiliary return flow usually feeds back into the high-pressure line to the 3ph. A tractor with a loader usually runs in the auxiliary system position. With the valve in 'remote' the 3ph should work but the loader wouldn't. I guess if the valve wasn't fully in either position it could create a line obstruction. Pressure ahead of the valve could be abnormally high and the oil could be abnormally hot. If that is the case, both the loader and 3ph should be slow and lines should heat when either the loader or 3ph is worked. I suppose that somebody who knows the tractor should comment so the valve can definitely be identified. If it's a diverter valve, it would be good if it worked freely and was fully in the aux position.






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 08-25-2001, 08:45 Post: 31271
Sparky



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 Hydraulic Stop Valve

On JD 4000 series the knob is called Speed of Drop/Lock Valve. Does anyone know
if hydraulic pressure is reduced to a backhoe, or any attachment that takes hydraulic pressure, depnding on how far the valve is to closed or even closed all the way? Also if lift arms? ( rockshaft ) is raised all the way and valve locked, does that hinder hydraulic pressure or damage any inner workings while running backhoe ? The person who dropped off my tractor and backhoe demonstrated how to attach the backhoe. He raised the backhoe with the rockshaft, pinned it in place and kept the rockshaft raised to hold it there. I ran it an hour then eventually read the instructions. You are told to lower the rockshaft and let the backhoe rest on the pins you installed earlier! Not hold it up with the hydraulics locked in place! Also, is it normal for a backhoe to drop in about a day till the bucket touches the ground?






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 08-26-2001, 07:04 Post: 31298
TomG

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 Hydraulic Stop Valve

The flow control valve affects only the drop speed of the 3ph. The power of the 3ph and other hydraulics are not affected. It sounds like there may be some 3ph leak down, which isn't a serious problem at moderate levels. From the comment, I hope the hoe is a sub-frame mount where the 3ph is used to lift the hoe onto the sub-frame mounts. If it's a 3ph mount, the comment may indicate a very serious problem. I believe that all 3ph hoe mounting systems all lock the 3ph down. If the 3ph doesn't lock down, the 3ph could accidentally be bumped into lift mode when an operator is in the hoe seat. The result is that the operator gets mashed between the hoe console and the ROPS. It doesn't hurt a 3ph to hold weight during operation, but weight ordinarily is taken off everything when the tractor isn't used. If the hoe rests on the pins, then weight is off the 3ph. I don't understand why the hoe would leak down to the ground over-night when mounted unless the mounting pins were removed, and I donít why they would be removed. Maybe it's not an issue, but I don't believe I'd want my 3ph subject to a lot of jolts if it were locked at the top of its travel. However, it's probably safe to trust engineering design as long as the mount is properly installed and adjusted. I would make sure that the 3ph is properly adjusted so it goes out of lift mode before the top of travel is reached. A 3ph shouldn't continue to lift when at the top of travel.






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 08-26-2001, 09:02 Post: 31302
Sparky



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 Hydraulic Stop Valve

Thanks for the info. JD 4400 has a frame mount, not 3ph mount for backhoe. The 3ph is used to simply lift it onto the plate steel mounts bolted to the tractor, then lower the weight of the hoe onto the 1" pins you slide in when all is lined up. Once you figure it out it is fairly quick to install, really fast to remove. So you don't think I damaged the 3ph by working the hoe with the weight hanging on it instead of the pins?






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 08-27-2001, 06:40 Post: 31312
TomG

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 Hydraulic Stop Valve

Probably no damage, but sticking with a manual's instructions always is a good idea. I imagine the pins are designed to take the working load. There's no need applying load shocks to the 3ph if you've got a hoe mount designed to avoid doing that. I think that the geometry of a 3ph hoe places most load shocks on the top-link. Load on the lower-links would come mostly from lifting, and would be down rather than up. I don't think it's too likely that the lower-links of your 3ph would be forced up. However, there is an absolute mechanical limitation to the upward travel of a 3ph. I believe it's possible to break a hitch by backing an implement into something with the hitch full up.






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 08-27-2001, 11:30 Post: 31323
Bruce W.



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 Hydraulic Stop Valve

Tom, what you are saying seems to match what my tractor has. I still have not been able to free up the stop/diverter valve. One other thing that has started to happen since I hooked up my new bush hog and began running it is a hydraulic fluid leak. I traced it to a small hole located on the front of my bucket level control valve cylinders. The hole is centered on a cap held in place by four allen bolts. Any idea what this is? A relief valve? Why it may be leaking?






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 08-27-2001, 11:30 Post: 31324
Bruce W.



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 Hydraulic Stop Valve

Tom, what you are saying seems to match what my tractor has. I still have not been able to free up the stop/diverter valve. One other thing that has started to happen since I hooked up my new bush hog and began running it is a hydraulic fluid leak. I traced it to a small hole located on the front of my bucket level control valve cylinders. The hole is centered on a cap held in place by four allen bolts. Any idea what this is? A relief valve? Why it may be leaking?






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