need help with hook ups on john deere 750 to hook up FEL

[krisbodean85]

i just purchased a used front end loader that wasnt used very much for my John Deere 750 the problem that im having is i dont know where my hydraulic lines need to go because it does not have quick connect but i was told that i can tap into some plugs that are under the seat but i dont know which ones and which one would be the pressure side and which one will be the return. i hook it up where i thought it would go but the fel wont go up or down or nothing so i must not have it right. and when i hook it up a diffent way the only way the fel moves is if i raise the three point hitch and get the hydraulics going and bottom the three point hitch out then it sends fluid to the fel and can operate. but i know this is not right can someone point me in the right direction.

 

[JohnDeereHere]

Are you saying that you have installed an aftermarket DSCV (loader control valve) and it won't function?Is it a John Deere loader or an aftermarket?If so what brand?

 

[RoyJackson]

Does your tractor have the "joystick"? Did one come with the loader?
You should see a pressure line leading from the hydraulic pump (engine driven, so it's going to be on the side of the engine) leading back to the Selector Control Valve (the joy stick mounts on that valve).
You don't want to pull the fluid of the rockshaft (which is what you're trying to do).
The attached picture is the Deere 4300/4400 hydraulic locations. Your 750 won't be exactly the same, but it should give you an idea of what components are necessary and where they're located.

Hopefully, someone with a 750 can provide better info. You can also contact the loader manufacturer if it's not a Deere brand.
OOPS!! The file is too big...if you leave your e-mail address, I can send it that way. I converted it to a .jpg. If you want the original .pdf file, let me know

 

[krisbodean85]

Its a bulldog brand fel i have not installed one of them didn't know i had to it has joystick control on it

 

[krisbodean85]

Krisbodean85@yahoo.com

 

[RoyJackson]

Its a bulldog brand fel i have not installed one of them didn't know i had to it has joystick control on it

I guess you sent that from a cell phone...
Does it, or does it NOT, have a joystick and SCV?

There's not a lot of info on Bulldog. Here's an old TBN thread:
http://www.tractorbynet.com/forums/yanmar/62539-bulldog-front-end-loader.html

 

[JohnDeereHere]

Since your loader already has a joystick you won't need another one.A hydraulic supply and return location need to be determined.I have a 650,which is very similar to your 750.I can possibly help with the supply location.My pump has a line that runs to a diverter block near the rate of drop knob.My tractor does not have power steering.This is the only pressure line coming from the pump.I will post a pic of this as soon as i get time.

 

[RoyJackson]

Krisbodean85@yahoo.com

File sent...

 

[kebo]

Man, one of the two 750's that I used to have had a hydraulic hose attached to the manifold just behind the seat, and to the right hand side of it. Actually, it was two separate hoses and each one had a quick couple to hook them together. I never figured out what it was for, but I can only assume that one hose had full hydraulic pressure, and the other one was acted as a return line. Unfortunately, I looked through all the pic's that I took of that tractor and apparently I never took a closeup of the two hoses. Sorry, I realize without a good pic, this isn't going to help you any but thought I would mention it.

 

[krisbodean85]

johndeerehere that would be very helpfull if you can send me some pictures of your tractor that would help alot cause its not doing me any good to the way it is now thanks for all yall input

 

[JCByrd24]

This should help, it's from my yanmar 186d manual, but they are cousins, yanmar made those deere. You are close, you just need a little plug inside the diverter block to force the flow the the loader valve. Without it the flow can just short right to the 3ph, which is why you could get some action when messing with the hitch.

 

[Jdman4x20]

This should help, it's from my yanmar 186d manual, but they are cousins, yanmar made those deere. You are close, you just need a little plug inside the diverter block to force the flow the the loader valve. Without it the flow can just short right to the 3ph, which is why you could get some action when messing with the hitch.

And just remember if you ever removed your loader you will need to remove the plug. If not the Hyd system will run in relief and the rockshaft will not function.

 

[JCByrd24]

It'd likely be worse than running in relief and non-fuction. Per the note in the lower right of that page, pump breakage is likely to occur. The relief is in the 3ph valving downstream of the diverter block so without removing the small internal plug when re-installing the external plugs the pump would be deadheaded and would shear the key or damage the pump.

To clarify, this is if you remove the loader permanently like if you sold it. Just removing for non-load work is not usually a problem.

When the valve stays with the tractor and the QDCs are in the working ports there is almost zero risk of the above.

Some loaders are plumbed so the loader valve removes with the loader, so the QDCs are in the pressure and return line vice working ports and you have to connect them together when the loader is removed, or else what is described above happens. This is a very bad way of doing the plumbing on this tractor.

 

[Jdman4x20]

It'd likely be worse than running in relief and non-fuction. Per the note in the lower right of that page, pump breakage is likely to occur. The relief is in the 3ph valving downstream of the diverter block so without removing the small internal plug when re-installing the external plugs the pump would be deadheaded and would shear the key or damage the pump.

To clarify, this is if you remove the loader permanently like if you sold it. Just removing for non-load work is not usually a problem.

When the valve stays with the tractor and the QDCs are in the working ports there is almost zero risk of the above.

Some loaders are plumbed so the loader valve removes with the loader, so the QDCs are in the pressure and return line vice working ports and you have to connect them together when the loader is removed, or else what is described above happens. This is a very bad way of doing the plumbing on this tractor.

Thanks for the clearing it up.

I was thinking that the relief was before the diverter block at the RCV to also protect the add on loader. If not the pump woud be damaged if the loader cylinders where fully extended,retracted or if the bucket was overloaded.

 

[JohnDeereHere]

Here are some pictures,as well as the John Deere tech manual illustration.Maybe this gets us closer.

 

[Zebrafive]

From what John DeereHere posted, your loader valve must have three ports for hydraulic lines. IN, OUT and POWER BEYOUND.

IN the next picture it shows two HEX PLUGS to the right of the vertical steel line. Top hex plug is labeled "I" Bottom hex plug is labeled "O"

From the hex plug labeled "O" go to IN port on the loader valve.
From the hex plug labeled "I" go to the POWER BEYOND port on the loader valve.
From the OUT port of the loader valve you need to find a place to return the hydraulic oil to the transmission case (sump). There must be a plug for that on the side or top of the transmission case some where.

 

[exciterfan]

Hi guys ! New on here and just picked up a JD 750 with an Allied Loader on it. Whoever installed the loader replaced the stock JD Hydraulis controal valves with a slick joystick and the loader works great. However my 3 point hitch doesn't work at all.

The Power Beyond port on the joy stick is not connected to the Return (or I) port on the tracter and I'm thinking that's why the 3 Poiint hitch isn't working. With the internal plug installed into the O port I'm assuming that the I port now becomes the source port for the 3 point hitch. Am I getting this right?

Surley there must be a way to get both implements working at the same time????

I'm going to map out the hoses tonight but any help you could give me would be greatly appreciated.

Thanks

Exciterfan

 

[Henri88]

:welcome: to TBN from New-Brunswick

 

[Henman]

i just purchased a used front end loader that wasnt used very much for my John Deere 750 the problem that im having is i dont know where my hydraulic lines need to go because it does not have quick connect but i was told that i can tap into some plugs that are under the seat but i dont know which ones and which one would be the pressure side and which one will be the return. i hook it up where i thought it would go but the fel wont go up or down or nothing so i must not have it right. and when i hook it up a diffent way the only way the fel moves is if i raise the three point hitch and get the hydraulics going and bottom the three point hitch out then it sends fluid to the fel and can operate. but i know this is not right can someone point me in the right direction.

Hi Chris, I am having the same issue with my hydraulic hook up to my 750 anyway you could send me a picture of where you hooked up into the transmission. I see the two hook ups above the on the rocker, but where does it go into Transmission?

 

[dodge man]

It’s a 12 year old thread, I’m not sure if any of those posters are still around or not but someone might help.