SBMF 2015
Well-known member
I've got a '66 JD 4020 power shift w/ a 158 loader that I kinda inherited from my landlord.
About a year and half ago we blew the head gasket on it.
Finally getting tired of seeing it sitting in the way so I scheduled with my mechanic to fix it nxt week.
He asked if I would take the ldr off before I brought it to him.
Put new batteries in the tractor and it fired right up. Just a small leak down the outside of the block. Decided to put a bale of hay in the lot for the cows before I took the ldr off. Picked up a bale, backed up, went to go forward and I had nothing. No trans pressure on the gauge. No movement forward or backward.
Decided
that it needed new hydraulic filters and the screen in the transmission looked at. Had to drain the oil to pull the screen. Finally got the drain plug broke loose ( I doubt it has ever been opened) oil was draining, but slower than I expected. ( I've done this to other JD tractors and the oil shot out of there)
I pulled the screen and the oil shot almost to the inside of the rear tire.
The screen is completely covered in nasty oily mud.
Once I get the screen cleaned up and the plug back in; Do I dare fill the hydraulic system with diesel fuel, let it cycle for a few minutes then drain it and put new hydraulic oil in?
As long as I don't move the loader controls nothing should get in the lines to the ldr. Will it hurt the power shift?
About a year and half ago we blew the head gasket on it.
Finally getting tired of seeing it sitting in the way so I scheduled with my mechanic to fix it nxt week.
He asked if I would take the ldr off before I brought it to him.
Put new batteries in the tractor and it fired right up. Just a small leak down the outside of the block. Decided to put a bale of hay in the lot for the cows before I took the ldr off. Picked up a bale, backed up, went to go forward and I had nothing. No trans pressure on the gauge. No movement forward or backward.
Decided
that it needed new hydraulic filters and the screen in the transmission looked at. Had to drain the oil to pull the screen. Finally got the drain plug broke loose ( I doubt it has ever been opened) oil was draining, but slower than I expected. ( I've done this to other JD tractors and the oil shot out of there) I pulled the screen and the oil shot almost to the inside of the rear tire.
The screen is completely covered in nasty oily mud.
Once I get the screen cleaned up and the plug back in; Do I dare fill the hydraulic system with diesel fuel, let it cycle for a few minutes then drain it and put new hydraulic oil in?
As long as I don't move the loader controls nothing should get in the lines to the ldr. Will it hurt the power shift?
I've had a FIL in the past that could dish out as much $hit as a FEL 
not back together yet, but I may have found the problem!
. You will not get everything out of the transmission case but this is what I do on a transmission case when not actually taking the tractor apart. There are two plugs on a powershift that drain the tranny case from the bottom. You have cleaned the screen which is good. I'd start with leaving both plugs in and pouring diesel in so that it comes out the port where the screen plug goes on the side of the tranny case. I'd take a long stiff bristle brush taped to a rod to clean this out and have someone pouring while I was scrubbing. Then I'd take the next bottom plug out that is closest to the engine and pour there, then the lowest plug. After diesel is drained, I'd go with a lower quality Hydraulic fluid then in a few hours of use change the fluid/filter. Reach out if you have any questions and I'd be glad to help.
