560 keeps blowing hydraulic line

Anyone have this problem ? 560 seems lime its overpressures hydraulics, blows line from pump to valve body. If you bump had lever it will relieve pressure. Where is the main relief valve located?

In the valve block next to the reservoir side. It includes the regulator and demand pilot. The pilot has a screen that could also be plugged. Jim

It is an open center system. The only time the relief valve should be activating is if you are using the hydraulics and you reach the end of the cylinder travel.

If this line is blowing with the tractor just sitting there running, you have a blockage in the valve stack, along with a relief valve problem.

The relief valve should activate to prevent the line from blowing, but also, it should not be activating in the first place.

Thanks all, demand orfive screen plugged with debris, you guys are first class.

It is NOT a true open center system. When the aux valve levers are in neutral there is NO flow through the aux valves. The flow is controlled by an unloading valve in the regulator valve block. That block contains the relief valve(heavy spring loaded one) a regulator piston with a ball and seat underneath it and then right in the middle is a screwdriver headed screw with a orfice and a screen on it. That orfice is the flow to the regulator valve piston when in neutral. The flow through the orfice forces the piston down and opens the ball valve dumping oil to sump. When you move the aux valve lever to raise or lower imp, the first thing that happens is it uncovers a land on the spool which is hooked parallel to a channel to the orfice screen. This allows much more oil to flow to sump through that channel than the orfice can provide to the regulator piston and therefore the ball seats and you go on demand.

If that orfice or screen plugs the regulator piston cannot dumup oil to sump and therefore you remain on pressure even in neutral.

Also, if one of the single to double adjustment roll pins are bent or broken that same channel in valve will be open all the time same as operating the lever so you go on demand (high pressure).

Might as well go a little farther here. The reason you can set it to double or single action is that in single action that land never uncovers when you move the lever to drop positon and therefore system stays on low pressure. That is the main reason IH used that system was for the single action control without having a float positon in the valve.

Pete 23 you are correct. A few years ago there was an article in the Red Power Magazine that explained the hydraulic system on the 300/400 and the X40 & X60 series of tractors. I wish I could find it. Can somebody help me with what issue.

Ryan every one forgot that if you have fast hitch it could be the follow up linkage not working right or the gears not working inside the hitch valve.

Very true about the fast hitch and linkage etc. I thought I had bloviated long enough so didn't open that can of worms. The teledepth valve itself can be troublesome with wear and require drilling the orfice out to over come the wear in that valve. Another subject.

Pete, Jim ,Charlie ace, mk, thanks for the help. I am a heavy eq field mechanic by day and tractor mechanic on afternoons.
Problem tractors seem to find their way over to us. Next in line is a 1370 powershift. I come here every night, and usually can't sleep until I read the daily post. Hope to get to know you all better. Thanks again. Ryan in eastern ohio

you state in the OP that the main line is blowing, the main feed line is steel on each end with a rubber section in the middle, if you are blowing this line (approx $300) there is a serious problem with the relief valve. The small screen you cleaned is right beside the relief valve, be sure the small piston(approx 1/2" diameter) under the heavy spring is moving freely

If you get a hold of the 300 & 400 hydraulic system service manual it has the very best explanation of the system you will fine. It of course does not get into teledepth valve but that does not matter with respect to how it operates. It is very well illustrated. When I first started working for the IH dealer in 1958 I carried my lunch to work. During noon break I would sit down and go through the service manuals. Heck, I had no intention of being a tractor mechanic, thinking cars, but no way could find a job so just tried IH temporally and still working on tractors.