ok bought ford 1900 4x4 with front loader knowing 3 point did not work , front loader works awesome, changed seal on piston the presses the rod that raises 3 point , seal was cracked bad , changed - no difference , loosened nuts on the end of controls (fast & slow control under front of seat ) no oil coming to control, whats next ??? any ideas, pull control unit from side ? THANKS !!!!!
1900 3 POINT HITCH WON'T RAISE
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jinman
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Yes, it sounds like the power beyond plug in your joystick valve has loosened and come out. It is normally an allen head threaded plug under another threaded cover that keeps the port sealed. When the plug is out, oil is returned to the reservoir rather than continuing through the open center system to the 3PH. The loader works fine, but the 3PH will not work because it never gets pressure. This has happened on several models of New Holland tractors. Do you have a New Holland loader? Is your joystick a New Holland joystick? If it is, I can look up the diagram and try to help you with the location of the Power Beyond plug.
jinman
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Is it the 771 loader? If it is a 771, I might have something for you to check. BTW: I'm not sure of the flow for your loader, but on most utility size NH tractors, there is a diverter valve that interrupts flow to the 3PH and routes it to the loader. The loader joystick valve then routes the fluid back to the diverter and onto the 3PH. New Holland does not make the joystick valves, but they do show detailed diagrams of the valves. If it's some other loader, then NH would not have any of their diagrams.
Another thing is the speed adjustment just affects the rate of 3PH drop. It does not change how fast the 3PH raises. Therefore, it only works when the 3PH is raised by metering how fast the fluid in the lift cylinder is allowed to escape back to the reservoir when the 3PH lever is moved down.
Another thing is the speed adjustment just affects the rate of 3PH drop. It does not change how fast the 3PH raises. Therefore, it only works when the 3PH is raised by metering how fast the fluid in the lift cylinder is allowed to escape back to the reservoir when the 3PH lever is moved down.
It is the 771 loader with victor control , where would I find a diagram ? I have the ff-44 book but does not show the loader stuff , just the pump. went to garage to look at the hyd. plumbing and this makes sense now. When you say diverter valve would this be in the loader controls ?? THANKS!!
JC-jetro
Elite Member
toolhawk,
I just got your pm. can't add much more than Jim already said about power beyond port. I do not have a loader on my rig to have first hand knowledge. What I would do is to systematically follow the hyd pump discharge pipe and verify flow or lack there of. One way you can easily verify flow is right at the lift cylinder head. There is a port where you can attach a gauge. You can search under my handle for thread I started and you'll see where I'm talking about. If you remove that plug, put a bucket under you can verify flow. if no flow I would then manipulate lift handle all the way open and closed to see if it eject a blockage, same as passing kidney stone. You might also have a blockage in your lift spool valve where it revert all the flow back to diffy.If you have flow when you remove the plug and no movement of the arm then there is a possibility that over pressure relief on the cylinder head is reverting/by passing the flow to the diffy. Do you put any load on the 3 point when you try to raise it? Have you tried to raise it with no load on it. Can you with the tractor off and no load on the 3 point manually by hand lift the lift arm?... thinking may be ram rod is not pushing the piston or the pin that hold it to rock shaft is broken. Give us some more input and we might be able to steer you in the right direction.
JC,
went out this morning just to confirm , I can raise and lower arms freely , can look thru side with spool removed and rod is connected and moving when arms are raised and lowered, will reassemble and loosen banjo bolt carefully when running to see if any pressure is even getting to spool . THANKS!!!
JC-jetro
Elite Member
Okay, sounds good. One by one we need to eliminate potential cause of the problem. There were several other thing I suggested. Let us know what you'll find out.
JC,
jinman
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Toolhawk, I'm going to post a few illustrations below, but I have to tell you that I may be way beyond my expertise with your tractor. I'm beginning to think that your tractor may not have that "power beyond" plug on the loader control valve. I'm sure that the hydraulic flow is diverted to the loader ahead of the 3PH, but the bypass path I described may not be there. Looking at the piping diagram and the valve diagrams makes me think your loader controls are a whole different genre than the newer loader and valves. The last thing I want to do is mislead you and make you waste time chasing your tail. Without a hydraulic system schematic, I have to advise you to take my comments as well-intentioned, but not necessarily reliable.
The diagrams below came from messicks.com. Go to this link. Enter your model number into the blank on the right side of the page (1900 or 771) and search through the parts diagrams. These show detailed breakdowns for both your 1900 tractor and 771 loader.
Attachments
Ok checked a few things with no luck,and called messicks , they told me to turn slot on block from 10 to 2 or other way , don't think the 1900 has that to divert front to rear ,
Hers what I did , loosened high pressure line that goes in under 3 pt controls , has pressure when running , pulled plug on side of lift cylinder head while running -no oil !!, backed off screw on control valve that bolt on spool and did effect the loader performance ,screwed back in , had no effect on 3 pt., I do have a pressure gauge but at am a loss what to check with nothing at lift cyl. head.. Thanks !!! for any help, and that messick site is awesome!!
Hers what I did , loosened high pressure line that goes in under 3 pt controls , has pressure when running , pulled plug on side of lift cylinder head while running -no oil !!, backed off screw on control valve that bolt on spool and did effect the loader performance ,screwed back in , had no effect on 3 pt., I do have a pressure gauge but at am a loss what to check with nothing at lift cyl. head.. Thanks !!! for any help, and that messick site is awesome!!