Ok my hydraulics were working fine during warm weather now they dont want to work. I got tractor in garage and warmed up garage to like 80 degrees and still wouldnt work. I put a jack under the bucket and had my son pull the control for up as i was jacking and it started to work. Moved snow put back in garage and just went out to use it and they wont work again...used jack again and they started to work. Any ideas of what is causing it to not work after its sat for awhile or could there just be some moister in the fluid and its making the pump freeze up alittle?