I bought a JD 5210 collarshift this past spring. I put in a block heater, and changed the engine oil and fuel filter, and did some other electrical work, but just replaced the hydraulic filter (didn’t see any sign of water in the fluid).
This morning it was 0F outside, and below 20F in the barn. The 5210 started right up after warming with the block heater, and the 3 point lift and power steering worked, but I couldn’t get it out of park. I assume there is water someplace that froze. It should get above freezing this weekend.
I am hoping that getting it good and warmed up and changing the hydraulic fluid (10 gallons) will fix it.
Well I talked a fellow through this a few years ago on this forum. The JD 5000 series will get condensation/water in the shift towers under the gear shift levers. The most common problem is the shifter boots crack with age and let in moisture. This area does not have any common area with the inside of the transmission. So you can drain/change the hydraulic oil all you want and it will not change the problem. (TimS, just because that one has set inside its entire life does not mean it will not have water in the shift towers.) There are service bulletins on this issue.
The first thing to do is warm up the shift towers and see if the shifter works normally then. An electric heat gun or hair dryer works great for this. If this frees up the shifter then you know 100% it is water in the shifter tower.
The “fix” is to remove the clamp/tie from around the shifter boot. slide it up out of the way. With the tower warm used compressed air to blow all the moisture you can get out of the tower. Then use WD-40 ( Use WD-40, not some other penetrating oil. You need the water displacement that WD-40 has and others penetrating oils do not) spray the inside of the shifter tower liberally. work the shifter to insure it is freed up. Then blow out the mixture of WD-40/water out. Then put a couple of squirts with an oil can, of light oil, I use hydraulic oil, in each tower. Reinstall the shift boot if it is good. Usually they are cracked and need replaced. I recommend lubing them once each year. I have not seen any repeated problem on any that were done as I outlined. The trouble is this is an area that does not get any lubrication and does get condensation in it.