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226B hose ruptures

I own a Cat 226B3 skid steer loader. Recently the supply hose to the cooling fan motor burst. I figured it was a defective hose so I replaced the hose. Upon startup the return hose from the fan motor burst. It appears that I have some sort of restriction in the fan motor hydraulic circuit after the fan motor. There must be a defective pressure relief valve somewhere in this circuit. Can someone please tell me where it is? Thank you very much. Steve