YM240D Bucket slow till 3pt hitch engaged

[joe swanson]

If everything is working fine great, other wise it sounds like you may be missing a headless plug in the 3pt hitch hydrolic assembly, I had a similar problem. wiht a 336 D. Plug is a simple brass plumbing plug with an allen socket.

Joe

Aaron (hoye tractor)

Thanks for taking my call the other day. We were correct the headless plug is necessary and its absence was causing the proble,. The chamber is 1/2 " Pipe and about 1 " deep, then it reduces to 1/4 pipe. this is where the headlesss plug goes in and block the passage between the TPH and th FEL. Works like a champ now.

Joe

 

[braeges]

Well tank wasn't realy a good description. The fluid is tapped out ot the top of the transmission directly uder the seat, it looked to me to be a separate tank. I'm still learning here. which brings me to my next question is what is a "headless plug in the 3pt hitch hydrolic assembly" and how do I determine if it is missing? I've ordered a service manual which hopefully should be here next week.

 

[winston1]

Braeges, I think the picture you are showing is your pressure line from your hydraulic pump to your 3 point lift. The plug they are talking about is a 1/4" npt pipe plug. I'm not sure it is applicable in your case. It goes in the outlet block if you have an auxiliary valve attached. Most loader valves are just teed into the already existing hydraulic lines. I'm wondering if the little square box you have circled is where your loader valve is teed in?

 

[braeges]

Yes, the loader's lines from the valve assembly go directly to the box.

 

[MJPetersen]

All our systems are what is called an open center system--what this means is that the pump is constantly pumping fluid through the lines and through the valve, but when no valves are actuated the pressure is almost zero. The flow volume of fluid is constant while the pressure varies with the work being done.

What that "box" does is redirect the flow from what was before the loader to what is after the loader. It redirects the flow from the pump to the "IN" port of the loader valve and accepts the flow from the loader valve (either the "PB" or "OUT" port) on to the valve for the 3 point lift. The "box" sends the oil flow on a detour through the loader valve. This places our valves in series, with the first valve having priority.

I will attach a diagram that maybe will explain it better than I can. It is not original with me but I copied it from some web site, which I have forgotten.

One question do you have 6 or 7 lines attached to your loader valve? The preferred method is with 7, but many are plumbed with 6. With 6, your control for the 3pt is located in the green return line of the first drawing, if you have 7, then the second schematic shows your system. 6 lines on the valve would be: 4 to cylinders, IN, and OUT (or R for return). The 7 line system adds a "PB" port (power beyond).

Mike

 

[braeges]

Thanks. The control Valve has six lines attached to it. There appears to be a connection point on the valve assembly for a 7th line which appears to have a plug. This is a new valve which the dealer installed, factory paint is covering this "plug". The four lines coming out the top go to the cylinders while the remaining 2 lines attach to the sides and are connected to the "box" as seen in the previous post. I have been using the FEL for the last two days and still cannot understand why the 3PH need to be engaged for the loader to work properly. By everyones descriptions it should not make a deffference.

 

[winston1]

As I understand hydraulics that box your lines come off of should stop the flow of fluid from going directly from your pump to your three point control valve. With the box installed the fluid now goes into one side of box, then through your loader valve and then back into the box and on to the three point control valve. Not being familiar with these hook up boxes can someone tell me how these boxes attach and how they stop the normal flow of fluid through the pressure line? I'm wondering if it is possible for that box to allow leakage through it which might cause the symptoms you are having. My loader just has the pressure line cut, short section removed, quick connect fittings installed on both sides and then hoses with quick connects going to loader valve. Hope this is understandable.