Hy tran has the ability to mix a small % water with oil, thus the problem in cold temps.
You have a milkey emulsion of water/oil trying to circulate.
Most other hydraulic oils keep water/oil seperate,
but when the moisture/water level reaches the suction inlet it will stop flow if below the freezing point in any system/with any oil.
Best to warm it up as good as you can and change oil/filter, as mentioned previously.
FWIW:
Bare in mind
when a paper filter, gets water in it, it swells and the bypass operates,rendering it useless,as a filter.
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