I was called out on a CAT 299D (GTC01960) today because the engine overheated. When I got there I realized quickly that the hydraulic cooling fan was not working at all. After verifying the electrical was working correctly I went on to a hydraulic problem. I pulled the solenoid valve on the fan motor to find this...…….
…….a nice sized sliver of metal wedged in the port hole.
…….a nice sized sliver of metal wedged in the port hole.