JD 850 Compact Diesel

[nmeister]

The three point hitch on this little tractor has either all the way up or all the way down positions. The control handle won’t hold at any point in between. Any thoughts for a solution?

 

[bmaverick]

The three point hitch on this little tractor has either all the way up or all the way down positions. The control handle won’t hold at any point in between. Any thoughts for a solution?

Did you follow the Troubleshooting section in the TM1192 manual? Section 70 & 270 covers this.

Basically, your JD850 in green paint is a Yanmar YM2500. If you can't find anything searching for the JD850, search then for the YM2500.

Under the seat is the hydraulic system. At times a seal, o-ring or gasket could get blow-by.

Those parts in the red circle above are in the TM1192

Then under the seat is the flower looking knob.

 

[nmeister]

Thank you. That should get me going on the repair.

 

[bmaverick]

Thank you. That should get me going on the repair.

Maybe a repair or maybe look at the 'other' controls under the seat. That Troubleshooting section walks you thru those to see if it's a repair of simple maintenance.

For example, you can turn the flower knob both ways until it comes to a full stop. Then place it back to the beginning again.

Next, there is a tiny lever under the seat. If it got bumped, the 3PT lift acts screwy. Here it is on my YM2500/YM2610 aka JD850/JD950. You may need to flip it to various places to change the lift/drop speed of the 3PT.

Lastly before opening up the hydraulic control system, when was the last time the filter and fluid was changed? And if changed, it better be J20C for our Deere and Yanmars. Anything else is crap. Here are 2 formulas that are to the J20C. There are others found at Farm & Fleet, TSC, ASC, and Rural King. It has to 'meet' J20C and not be compatible-with J20C.

Our 2 machines are nearly 95% identical. So, changing the fluid and cleaning the hydraulic filter is identical.

Hydraulic Fluid Change

www.tractorforum.com

 

[bmaverick]

Thank you. That should get me going on the repair.

More on the hydraulic fluids of J20C are attached.

As Yanmar owners, we keep to the OE specs of Yanmar and Deere.

Shown are both of our machines made on the SAME assembly line with the SAME engine.

 

[Tx Jim]

I suggest to check for correct attachment/operation of 3pt feedback rod(item D).