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Message: <blockquote data-quote="jeffco" data-source="post: 40017" data-attributes="member: 2081"><p>When my frozen hydraulic system saga began it was much like yours, when it finally warmed up and thawed out I found 10 gallons of water, frozen of course in the sump. 10 of the 27 gallon capacity. I found the plate under the pedals was allowing water in at quite a rate because most of the bolts were broken. Make sure when you service it change all 3 filters, I know the one under the pedals is a bear and most times is not changed but its a 10 micron and doesn't hold much water. I generally park with a 2 x 10 under the rear tires and just loosen the drain for the sump and drain off any condensation but now its maybe a teaspoon instead of gallons of water. I used about 4 ounces of diesel fuel conditioner in the hydraulic oil just to help dry it out, that seemed to help. I replaced the sensors with gauges for charge pressures, the left is 18 psi hot or cold and the right is 200 psi hot or cold. These pressures are a bit flexible but need to be above the minimum or the system will be noisey. If you get enough water to freeze things up I think your cylinders will have water in them also so you might want to empty them as well. I use Tractor Supply Universal Hydraulic oil, about 28.00 for 5 gallons and think it works fine. After 1 year crystal clean. I change the filters every year and keep 27 gallons in the sump. Good luck Jeffco</p></blockquote><p></p>