Hydro Pump question

Hello! The hydraulics on my 860 aren't working in the cold weather. Went to plow snow for the first time and got nothing. Good thing it wasn't much snow to begin with!

Fluid is at proper level and appeared perfectly fine. It was newly added a few months back.

First thing I did was opened the plug on the pump and turned it over, got nothing to come out. Then I used compressed air to prime, and closed it finger tight as it was over flowing. The 3pt lifted briefly (20-30 sec) but then fell.

Next I then tried introducing the air with the plug in (while running) as recommended many places and that didn't seem to do anything.

Tried the first method once more, and got nothing but fluid w/ air pouring out & No movement from the 3pt.

They had been working prior to the cold weather, although I had noticed they were a chattering a bit in fall. They also would stay up with a blade on for a few hours, but the next day the blade would be on the ground.

Sounds like a pump rebuild is in order but I have a tendency to skip over simple solutions. Any help on where to go next would be appreciated.
 
Try putting the front end in a ditch so the pump is as low as the hydraulic compartment and see if it primes.
 
The chattering could be your pump seal going out by letting air bubbles in. The cold weather probably will make things worse. It could also be your unloading valve sticking. You can take out the fill plug under the seat and see if you have oil dumping out of the front of the cylinder, you might need a mirror and light. Its easier to see things at night so you arent blinded by the ambient light.
 
I would look for the oil flowing out thru the fill plug under the seat first. Someone said you can pull the plug (lower you arms first) on the right side of the top cover near the front and blow air in there to see if the arms will lift. It might also move something that may be stuck. You can type in the search bar your model number along with hydraulic lift problem and when the page resets hit search again. It will pull up old posts on the subject. Do you have 2 plugs on your pump or 1 plug? On the pumps that have 2 plugs the plug closest to the driver is a priming fill hole.
 

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