deere 755 3 pt not working

[somanytractors]

I have a 755 I got not running and don't know it's history.
It has the levers and quick couplers for a loader but no loader.
It runs and drives great and the power steering works great.
If you move the lever for the loader it will bog down like it should.
The 3 pt does nothing at all. No bog no lift, nothing.
I was told that on the 755 if you remove the loader you need a jumper to get fluid to the 3 pt.
This makes no sense to me as the loader only has 4 hoses 2 for lift and 2 for tilt I would think.
Anyway, if I do need to jump it I dont know where to put the jumper.
The couplers for the loader are numbered 1, 2, 3, and 4.
Do I need a jumper or is it something else?
I've attached a few pics. I'm not at all familiar with these little deeres so I really need it spelled out.

Any help is greatly appreciated.
Thanks
John

 

[bmaverick]

I have a 755 I got not running and don't know it's history.
It has the levers and quick couplers for a loader but no loader.
It runs and drives great and the power steering works great.
If you move the lever for the loader it will bog down like it should.
The 3 pt does nothing at all. No bog no lift, nothing.
I was told that on the 755 if you remove the loader you need a jumper to get fluid to the 3 pt.
This makes no sense to me as the loader only has 4 hoses 2 for lift and 2 for tilt I would think.
Anyway, if I do need to jump it I dont know where to put the jumper.
The couplers for the loader are numbered 1, 2, 3, and 4.
Do I need a jumper or is it something else?
I've attached a few pics. I'm not at all familiar with these little deeres so I really need it spelled out.

Any help is greatly appreciated.
Thanks
John

Your tractor is really a Yanmar. Either ask in the Deere section or the vintage Yanmar section.

The TM1360 Technical Service manual can be found for free on the YTOG site. This will show you the typical hydraulic plumbing with the Yanmar loader on the JD755.

 

[oldnslo]

If the directional control valve stays with the tractor when the loader is removed it should not require a jumper for the 3 point to work.

How many lines connect to the control valve including the four for the loader? 6 or 7?

 

[somanytractors]

Your tractor is really a Yanmar. Either ask in the Deere section or the vintage Yanmar section.

The TM1360 Technical Service manual can be found for free on the YTOG site. This will show you the typical hydraulic plumbing with the Yanmar loader on the JD755.

Not sure why I posted it here. Wasn't thinking. deere or yanmar probably would have been better.
Thanks for the info. I didn't find the manual on that site but before I didn't even know what to search for. I googled "TM1360 Technical Service manual" and I did find a free download.
Thanks!

 

[somanytractors]

If the directional control valve stays with the tractor when the loader is removed it should not require a jumper for the 3 point to work.

How many lines connect to the control valve including the four for the loader?

If the directional control valve stays with the tractor when the loader is removed it should not require a jumper for the 3 point to work.

How many lines connect to the control valve including the four for the loader? 6 or 7?

I'm pretty sure that everything stays with the tractor. It only has the 4 quick couplers. And the lever to work the loader is on the tractor. What I was seeing about a jumper didn't make any sense to me. I'm thinking there is no need for a jumper. I don't see any other lines from the block that controls the loader. I think the block in front of it has the in line and the relief valve. Other then that I'm not sure. I put it all back together, and then decided that I really need to see if I can get the 3pt going. I'm going to pull the covers off tomorrow when its warmer. Then I'll be able to see what lines go where, but I don't really remember any lines for the 3pt. Is there anything that would let the loader lever bog the motor but not send anything to the 3pt other then the directional valve? I dont see any lever on any of the valves either, other then the loader control. Is the directional valve automatic or should there be a lever somewhere?

Thanks for your help!

 

[gstrom99]

Your 755 does have a Yanmar engine, but it would have been assembled in Horicon, WI. This is a pic of the manual you want (print version might be pricey). The 3 point was standard on the 855 and 955, but it was an option on the 755. It's controlled by the sliding lever to the right of the seat. Assuming all the bits are there (and the same as my 855), look for this round valve under the seat which might be turned so far (too far?) as to shut off the 3 point operation.

 

[bmaverick]

Not sure why I posted it here. Wasn't thinking. deere or yanmar probably would have been better.
Thanks for the info. I didn't find the manual on that site but before I didn't even know what to search for. I googled "TM1360 Technical Service manual" and I did find a free download.
Thanks!

To find the manuals on the YTOG, you must login to see the WIKI page to have access.
Just visiting the site only give very limited offerings.

There are other manuals too related to your machine over there.

 

[bmaverick]

Your 755 does have a Yanmar engine, but it would have been assembled in Horicon, WI. This is a pic of the manual you want (print version might be pricey). The 3 point was standard on the 855 and 955, but it was an option on the 755. It's controlled by the sliding lever to the right of the seat. Assuming all the bits are there (and the same as my 855), look for this round valve under the seat which might be turned so far (too far?) as to shut off the 3 point operation.
View attachment 4889089View attachment 4889090

Yes, the 55 series had to be assembled in the USA as a kit tractor supplied by Yanmar due to the import and tariff restrictions back in the day. This kept the import costs to be lower and the Deere union workers happy.

 

[bmaverick]

Your 755 does have a Yanmar engine, but it would have been assembled in Horicon, WI. This is a pic of the manual you want (print version might be pricey). The 3 point was standard on the 855 and 955, but it was an option on the 755. It's controlled by the sliding lever to the right of the seat. Assuming all the bits are there (and the same as my 855), look for this round valve under the seat which might be turned so far (too far?) as to shut off the 3 point operation.
View attachment 4889089View attachment 4889090

This manual being the OPS manual, is free to download off the Deere site.

Search for Equipment Publications - Technical Information Store

techpubs.deere.com

 

[somanytractors]

Your 755 does have a Yanmar engine, but it would have been assembled in Horicon, WI. This is a pic of the manual you want (print version might be pricey). The 3 point was standard on the 855 and 955, but it was an option on the 755. It's controlled by the sliding lever to the right of the seat. Assuming all the bits are there (and the same as my 855), look for this round valve under the seat which might be turned so far (too far?) as to shut off the 3 point operation.
View attachment 4889089View attachment 4889090

To find the manuals on the YTOG, you must login to see the WIKI page to have access.
Just visiting the site only give very limited offerings.

There are other manuals too related to your machine over there.

I've moved this to the jd section. https://www.tractorbynet.com/forums/threads/deere-755-diagnosing-3-pt-problem.643145/

Again thanks for directing me to the manual. Everything makes a lot more sense now! It doesn't look all that different from what I'm used to. Just configured a little differently, smaller and buried under everything.

 

[somanytractors]

I went o

If the directional control valve stays with the tractor when the loader is removed it should not require a jumper for the 3 point to work.

How many lines connect to the control valve including the four for the loader? 6 or 7?

I went out and pulled off the covers again. The main pressure line comes it to the right side of the 1st block. On the left side of the 1st block is one line that goes up to the front of the tractor, power steering as best I can tell.
The second block has the lever for the loader with 4 lines coming off the top and going to the quick couplers. That block has 2 housings sticking out the left side but no lines.
There is one other line I can see coming from the front and hooking into the left side of the housing near the rear. I believe it's probably the return from the steering. Beyond that theres the lever for the 3pt and the link to tell it where the arms are.
Thats all I can find going into the system.

 

[oldnslo]

I went o

I went out and pulled off the covers again. The main pressure line comes it to the right side of the 1st block. On the left side of the 1st block is one line that goes up to the front of the tractor, power steering as best I can tell.
The second block has the lever for the loader with 4 lines coming off the top and going to the quick couplers. That block has 2 housings sticking out the left side but no lines.
There is one other line I can see coming from the front and hooking into the left side of the housing near the rear. I believe it's probably the return from the steering. Beyond that theres the lever for the 3pt and the link to tell it where the arms are.
Thats all I can find going into the system.

First for clarity are the 3 point arms lowered and won’t raise or are they fully raised and won’t lower?


From your description above it almost sounds like that tractor has a priority flow control that supplies oil to the power steering and excess flow is directed to the loader and 3 point. You stated engine works when activating loader function so that indicates flow going to loader valve.

The power steering flow may come back and act as charge flow for the hydrostatic transmission. ( presuming HST) you state steering is working fine.

With out a hydraulic schematic I am unsure of how oil is supplied to the 3 point. Typically it would be via power beyond from loader valve.