I have a JD 323D CTL that is overheating due to the cooling fan not functioning. At times it will function so I am thinking an electrical problem perhaps with a solenoid that operates the hydraulic cooling fan motor? Would anyone have an electrical and/or a hydraulic schematic of the cooling fan circuits? If I have to purchase a manual I will, thought I'd check here first. Any common failures with this sort of problem on these machines? Thanks!