Rear 3PH is not working - running into a wall

[rScotty]

Thanks for this. Where is this sleeve? Is this on the manifold or on the control valve (#21 below), which requires disconnecting the lines and removing the manifold. And to complicate things, the parts diagrams do not have a breakdown of the control valve but the manual does. I am guessing that they replace the control valve entirely and not the valves n bits themselves.

Here is the parts diagram I was able to get. They don’t make it easy to copy/paste links.

https://johndeere.widen.net/content/p5mnf9xpzo/jpeg/0003156839____________A1.jpeg?w=1900&h=1900

And what would be my PB port? Would it be labeled?

After a small amount of flow is diverted to the power steering, all the remaining flow goes to a series of contol valve assemblies. Each control valve assembly from the FEL control onward - even if it is an assembly with only a single control valve like the 3pt control - feeds pressure out of its power beyond port and sends the pressure to the IN port of the next control valve in the series.
Usually the FEL power beyond port has PB stamped or cast next to it.

The sleeve is within the body of the control valve. To find it, locate the PB port, undo the hydraulic hose going to that PB port..... and the sleeve is the next thing inside the port.
Sometimes it just slips out and sometimes it is threaded.

Since you said that you had worked on that valve, your PB sleeve might have slipped out and been lost. It's a common enough problem to be worth mentioning. Stick around TBN for awhile and at least once a year someone takes their control valve apart and loses their PB sleeve. When they do, the tractor HST, and steering, and FEL all work fine, but nothing else hydraulic works at all. No pressure. A stuck accessory solenoid will do the same thing.

rScotty

 

[arcteryx]

Page 70-30 -2 shows item H as implement pump to rock shaft valve supply so if my interpretation is correct line H would be connected to power beyond line from FEL to rock shaft valve which is 3 point hitch.

This is based on that diagram on page 70-30-2 not including an FEL valve.

Correct, that is called the "Implement Pump to Rockshaft Valve Oil Supply Line”. I did confirm that fluid is flowing into the lower (lowest) right valve on the manifold.

 

[arcteryx]

After a small amount of flow is diverted to the power steering, all the remaining flow goes to a series of contol valve assemblies. Each control valve assembly from the FEL control onward - even if it is an assembly with only a single control valve like the 3pt control - feeds pressure out of its power beyond port and sends the pressure to the IN port of the next control valve in the series.
Usually the FEL power beyond port has PB stamped or cast next to it.

The sleeve is within the body of the control valve. To find it, locate the PB port, undo the hydraulic hose going to that PB port..... and the sleeve is the next thing inside the port.
Sometimes it just slips out and sometimes it is threaded.

Since you said that you had worked on that valve, your PB sleeve might have slipped out and been lost. It's a common enough problem to be worth mentioning. Stick around TBN for awhile and at least once a year someone takes their control valve apart and loses their PB sleeve. When they do, the tractor HST, and steering, and FEL all work fine, but nothing else hydraulic works at all. No pressure. A stuck accessory solenoid will do the same thing.

rScotty

Thanks for this. I thought PB was the rearmost line on a tractor, but from what I read, there can be multiple PBs if it supplies power to another valve, ie a PB on the SCV.

The manual only refers to PB for rear remotes. I don’t see a name for the PB on the control valve, here are the components of the valve. While it does show the breakdown of each item, there are no part #s as it is not serviceable, meaning you have to purchase a complete control valve.

 

[oldnslo]

Correct, that is called the "Implement Pump to Rockshaft Valve Oil Supply Line”. I did confirm that fluid is flowing into the lower (lowest) right valve on the manifold.

To be clear was the oil flowing into the rock shaft valve?

 

[arcteryx]

To be clear was the oil flowing into the rock shaft valve?

Correct, it was going into the valve.

 

[oldnslo]

If going into the valve you now have to determine what is happening to that flow when you command 3 point movement. If it stops then problem is in supply to 3 point - rock shaft valve. If flow keeps going then something in rock shaft is not correct or seals on rock shaft cylinder are completely gone.

 

[camshawn]

On my old yanmar, the piston seal for the cylinder that operates the lift arms failed. It bypassed back into the tank.

 

[arcteryx]

I looked into this a little more. I remove the rockshaft to check on the seal for the piston. It had some rust on one side, used a wire brush to get the shaft and piston clean again. See pic, it’s all clean now though. It may have been frozen from rust as it did not want to move initially. I have gaskets on order.

I then checked to see if the line for the rockshaft was putting out fluid, it was not. This certainly would prevent the rockshaft piston from moving ). I have confirmed that fluid comes into the manifold and the returns ok, these are the three lowest hoses on the bottom of the manifold in the previous photos.

Some questions
1- Would lack of pressure prevent any fluid from coming out of this top line to the rockshaft? I don’t think it would but want to confirm. I don't have a pressure gauge set and there are no quick couplers. Maybe I should get a set if this would aid in troubleshooting? Given that flow is happening in the system and the FEL/power steering work, it appears to be correct.
2- Is there anything in the manifold that could block the fluid from entering the rockshaft feed line?
3- I did adjust the relief valve to increase pressure, but no change on the rockshaft. There are 2 components, the manifold and the control valve. Even though I took apart the control valve, it is possible it’s faulty. I am unsure how, any ideas? Perhaps the springs are out of spec? I am trying to decide if I should get a control valve or get the entire manifold which includes the control valve.
4- Would a bad relief valve cause this behavior even though the FEL/PS work? The relief valve is the second thing to the left of the hole in the second pic, with the allen head top.

Thanks for reading and your feedback.

 

[beenthere]

Do you have the service tech manual that has the hydraulic control lines featured ? My 4300 does, so would think the 3032E would as well.

Seeing the rust, maybe some blockage of a valve or a screen is plugged.

When was last hyd. oil and filter and the screen changed and/or cleaned?

 

[arcteryx]

Do you have the service tech manual that has the hydraulic control lines featured ? My 4300 does, so would think the 3032E would as well.

Seeing the rust, maybe some blockage of a valve or a screen is plugged.

When was last hyd. oil and filter and the screen changed and/or cleaned?

When you say hydraulic control lines, what is that specifically called in the manual?

I changed the 2 filters about 2 months ago when I got it, unsure when it was done before that. I don’t believe there is a screen, just 2 spin on filters.