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| Dear All,
I am farming in Hungary in Europe and this spring I found a late model 750 boxdrill 7,5" (025953). It had some missing parts, wore out blades, tight bearings etc. I have read this forum many times and helped me a lot to get an idea how to rebuild the drill. We have worked on it and it is in a good shape by now. This machine is not very popular over here - just a few unit was exported from the US in 1998, so it hard to ask anyone about experience.
I have problem with the coulter pressure. The previous owner changed the pressure gauge so it doesn't have the colored stickers so I don'T know what is the recommended pressure range. Anyone can share a picture about the original gauge?
The other problem is that if I set the pressure to a 1000 psi after a 100 feet it dropes back to 500. I have checked the Hydraulic couplers and lines about leakage, but I found nothing. I have no idea what should I check.
This drill is equipped with the original JD marker. Is anyone knows how should it work?
Right know I don't like it. Once I activate the hydraulic, both marker arm goes down and once the reached the ground I am able to lift up one of them. I can't make rhythm with it, if I want to change it on the headland the marker arm which is used comes up and I am not able to take down the opposite one. It's a pain in the *ss to turn with it,
Is it normal, or something messed up in my system??
Thanks in Advance
pintacsi
Edited by pintacsi 11/7/2015 15:41
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Central Pennsylvania | I cant help with your questions much except for the down pressure. Not much use in going past 750 PSI. If you do it will just lift the wheels off the ground. |
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| Yes you are right. Right know I don't trust the gauge probably it isn't indicate the right pressure. Maybe I should just replace it, would be nice to see the original one and see what is the range. |
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South Central Illinois | The drill is designed for active down pressure. That means the control needs to be in continuous mode. Do you know how to do that? |
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| So the SCV has to be in the continuous mode all the time?
I was assuming that I need this mode when I am setting up the down pressure. |
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South Central Illinois | It needs to be in continuous all the time. That allows the drill to maintain the set pressure. |
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South Central Illinois | The marker sequence valve probably needs to be replaced. It is probably an individual component. It is possible that it could be rebuilt. I am not familiar with the set up that you have. After rereading your post, I wonder if the valve is set up backwards. Sounds like it is doing what you want it to do, only when it is raised instead of when it is lowered. Try switching the hoses.
Edited by John Smith 11/7/2015 16:15
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| Now it is clear for me! Thanks for the idea!
Don't you have experience with the JD markers? Maybe I am doing something wrong. |
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| Yes it is an individual part. This winter I will disassemble and see what's inside.
Thanks for your comments John! |
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South Central Illinois | I am very familiar with JD planter markers. Our 750 drill has aftermarket Yetter markers instead of JD markers. |
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South Central Illinois | Did you notice my edit? |
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South Central Illinois | Any time that I have both markers down they will both raise at the same time. There is something wrong with how the hoses are set up. Not on the tractor connection, on the sequencing valve.
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| Yes. I noticed. I left the marker hoses as they used to be .
I will check it. I guess there is drawing about the connection of the hoses in the parts Catalogue. |
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Richardson county Nebraska | More importantly than the reading on pressure gauge watch to see that the two square tubes that openers are mounted on are running with the top of them running parallel to ground. Under rotate and you will get seed on top, over rotate and you well cause excessive wear to the boots. Then as told earlier the tractor hydraulics should readjust according to ground condition. Not sure on your tractor but they make a clip to hold lever, or on newer models turn time to C for continued flow. |
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| I exchanged the drill couplers on the tractor SCV and it didn't make any changes , actually it became worse.
That's way I thought something must be wrong. I will check hoses from tha Parts Catalogue.
I guess when I am on the field it should work as I mentioned in the first post.
One side down the other up, once I operate the SCV, they switch position. Right? |
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| Thanks to your comments I know now my fault. I only used the continue flow, when I set up the ground pressure.
Don'task me why. :) Never had any machine with active pressure.
Thanks for you ideas! |
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Jackson County, AL | Rather than fool with the sequencing valve, do you have enough SCVs to run each marker individually? That's what we always did if we had 3 SCVs on the tractor. |
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| Grat Idea, Unfortunately I only have 2 SCV's on the tractor. :( |
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NNW Nebraska | I put enough pressure that i can just start to see it come up slightly when empty. Deaper and more trash, needs more pressure. If left back wheel is comming off ground, too much pressure or needs weight if ground is super hard, or lots of trash.
Mine has after market narkers. Let one down, next time the other one goes down. Let one down, cylcle the lever quick (up & right back down), and the other one will drop as well.
If your drill has the cast closing wheels with the bearing in the wheel, get updated ones that have the bearing in the arm, they eat bearings fast. There are aftermarket conversions to the newer style that work tremendously better.
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| With the after market markers you have both marker down, when you turn around on the headland??
You bet with the closing wheels. :) My next investment will be the updated wheel kits. I changed enough bearings this year. |
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Elizabethtown,KY | I bought a new 750 in '97 that had Deere markers, the sequencing valve is the same as a 7200 6 row corn planter. |
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North Central Texas | The 1560 manual covers 95% or better of your drill and shows the guage pressure and marker system.
http://manuals.deere.com/omview/OMN200998_19/?tM= |
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NE Indiana | Matt Hagny has good information on his website on setting up no-till drills. In particular he says don't worry about the gauge, look at your rockshaft and springs to know if you have enough down pressure or not.
http://www.exapta.com/knowledge/tipdrill.html |
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| Here is the original color coded one. I try and stay right at the top of the green zone and I believe there is something in the book about not running in the yellow zone without added weights on the back cross bar. Also have factory JD markers on mine with the sequencing valve. Push lever forward and one marker goes down. Pull back and it raises and switches valve so next time the opposite one goes down. Can also put both markers down at the same time. Put one down then quickly pull lever back for a split second which causes the sequence valve to change. Push the lever forward and the other marker drops. Then when you pull the lever back both markers will raise together. Nice feature if you need to lay out a straight pass with marks on both sides or for drilling a waterway where you drive in the center and want an additional pass on each side. Sounds like a sequencing valve issue if they are both going down unless you are changing direction of lever while putting first one down. Usually run lever in float condition once on the ground. Here is a picture of my sequencing valve. Lines on top and bottom got to tractor but in my case they go to a push pull splitter valve so I can run markers and drill fill (but only one at a time) off 1 tractor remote. Without ever having to couple and uncouple dirty hoses in the field.
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| 70'JDplowboy - 11/7/2015 15:26 More importantly than the reading on pressure gauge watch to see that the two square tubes that openers are mounted on are running with the top of them running parallel to ground. Under rotate and you will get seed on top, over rotate and you well cause excessive wear to the boots. This is a myth that originates in the JD Owner's Manual. All the square tubes (aka rockshafts) do is compress the big coil spring on each opener. In no-till conditions, it is often necessary to rotate the rockshaft beyond horizontal by as much as 15 or 20 degrees. If the frame lifts, add more frame weight. This often equates to 1200 psi or so. Softer soils will need less. |
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South Central Illinois | Correct. Every marker system that I ever used could be tricked into dropping the second marker after raising the first one a 1/4 inch. After the second marker is down the lift would lift both markers. Yours sounds backwards. Check out the instructions if you can. |
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South Central Illinois | I think he needs to switch the hoses going from the sequencing valve to the markers. This can probably be done on the valve or the cylinder. |
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| guage wheels should just make firm contact with the soil. Too much and hard on components, too little and not going deep enough. Works for me anyways for finding the correct downpressure. |
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| I am pretty sure now that the hoses are mixed up on the sequence valve. Next weekend I will check it.
Thanks for your comments, helped me a lot! |
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| Hello Won WC,
I will keep in my mind that the edge of the green zone is at 700 psi, so that is the maximum what I need. We seed winter wheat after sunflower or corn and there is always at least 1x stubble cultivation. So we don't need the extra weights.
After reading your description about the markers, that is what I expected from the marker system. According to your comment I am sure that my hoses are mixed up on the sequencing valve or something wrong inside. I will check it next weekend.
Thanks for these sharp pictures. Your machine looks awesome, just like a brand new!! I guess she never slept outside! My was never shedded so the paint is gone.
What tractor do you use for pulling this drill?? |
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| We don't have no till conditions at the moment, (maybe in the future we will). We seed winter wheat after sunflower or corn and we do have a stubble cultivation at least once.
The government pushing us now to use cover crops after summer harvest, so I planning to try out with this drill.
I guess by than this knowledge will be very useful.
Thanks a lot! |
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| Yes this is what I was doing, but it is always good to have some feed back from the gauge also. |
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| Thanks for the idea! I will check it! |
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| Glad to help lots of great advice and knowledge on here so if you have any more questions be sure and ask. This drill goes to the barn at night but sometimes get caught in rain when it's really dusty and that makes it a mess. Pulled with a John Deere 4040 with a M&W turbo.
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| If you do not get the markers to work after some of other ideas, remove and take the marker cylinders apart. There were some cylinders of that vintage that would have the piston retaining nut loosen and allow the piston to fall off the end of the rod. Had the same problem with a few planters that age also, and you have the planter style markers. |
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John Deere 750 boxdrill pressure problem
