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860 3 pt

F

ford860

New User
my lift stopped working after using it to plow one day, unhooked and went to hook up bush hog and the arms wouldn't lift. Checked fluid and have plenty, no milky color. read thru archives about putting air to the dipstick hole and sounded the easiest route so naturally tried that. After 20 seconds of putting air in i started seeing fluid coming from the starter button. I had the control in the up position,should i leave it in the down position? Is it supposed to push fluid from the starter button? Have a wiring question too but will put in a separate post
 

Welcome! Putting air in the hydraulic section should not have anything to do with forcing oil out of your transmission.

Makes one guess that your hydraulic pressure tube has ruptured inside your transmission and needs to be replaced.

I've never had to work on this problem, but know there are others on this forum who have. Perhaps they'll chime in.

You'll drain your transmission in the process, but it's way over full now.
 
If you have oil coming out the starter switch, you have pumped center section oil into the transmission. The most likely cause is a leak in the pressure tube that runs through the transmission. The hydraulic pump pulls oil from the center section sump and sends it to the lift. But a leak in the the tube through the bottom of the transmission will send it into the tanny. Time to replace that tube.
 
(reply to post at 16:05:33 08/12/17)
Click to expand...
I have the shop manual, i'll get it out and see what's involved in changing the tube,but i doubt i have the tools or money to do it. I was using 2-14 plow and it was really lifting the front end up at the end of rows. Would that weight bouncing on the lift arms caused my problem? I figured i was low on fluid but either had hyd. oil coming out of the pipe plug holes and it was on the full mark on the dipstick. Thanks for getting me in the right direction
 

My guess is that the tube was weak already. Bouncing anything on the 3 pt would be the proverbial straw that broke the camel's back.
 
I'm away from home and the manual, what's involved in fixing this? Will i need to split the tractor?
 
I've heard of people driving another tube into the middle of the other tube to seal it off, never tried it myself. you would have to pull the pump manifold off to do that.
 
I agree with the others that you have a leaking hydraulic line in the transmission, but it is not the pressure line, it is the suction line. Air in the filler hole is not going to pressurize the pressure line in the transmission. It will pressurize the suction line.

The rear end of the pressure line goes into the 3 point lift control circuit, not the hydraulic sump. The rear end of the suction line on the other hand goes through the pickup tube directly into the sump.
 
(quoted from post at 21:37:06 08/12/17) I agree with the others that you have a leaking hydraulic line in the transmission, but it is not the pressure line, it is the suction line. Air in the filler hole is not going to pressurize the pressure line in the transmission. It will pressurize the suction line.

The rear end of the pressure line goes into the 3 point lift control circuit, not the hydraulic sump. The rear end of the suction line on the other hand goes through the pickup tube directly into the sump.
Click to expand...

How does this account for his lack of lift? I believe you are incorrect.
 
How does this account for his lack of lift? I believe you are incorrect.
Click to expand...

Could be both tubes are leaking, but I don't think that if only the pressure line was leaking that air pressure in the hydraulic sump would cause the fluid to come out the top of the transmission. That air pressure trick is used to hep prime the pump, which means that the pressure of the air causes pressure in the suction line, not the pressure line. Maybe if the fluid in the hydraulic sump was so low that the air was going all the way through the pump to the pressure line, but then all that would be getting into the transmission would be air, not more fluid.
 
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