Posted by ranchingelec on January 16, 2020 at 11:05:44 from (216.174.157.34):
Hello there. I figured I would pick everyone's brain out there since we all have a vast spectrum of knowledge. With temperatures hovering around -40 here in northern Saskatchewan this week, starting tractors outside in the cold can be interesting. We have a Caseih 7120 magnum that has blown the auxiliary filter up 2 times now. From the looks of the hydraulic schematic this oil comes from the front gear pump and feeds the pto valve as well as the cooler circuit. There is a oil cooler pressure relief in the pump set for 1525-1625 PSI but the filter and housing are only rated for 1000 PSI burst pressure. There is a plugged filter bypass in the filter housing but that would not keep the filter from blowing as it is a bypass not a pressure relief. What am I missing here... I do not see a cold oil bypass anywhere in the circuit. Has anyone else had this problem with cold oil. Yes if we had the facility it should be in a warm building but that is not an option. Synthetic oil is hardly an option at 14 bucks a liter... and that would be 190 liters at total cost of 2660$ CDN bucks. Is there anyone here with experience on these tractors?
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