06-10-2018, 06:35 AM
You don't mention the manufacturer but likely it is either a Kubota or Yanmar powered set. The sensors are nearly identical for both engine makers, the sensor with the bullet connector is the HIGH WATER TEMPERATURE switch, and the threaded connector is the gauge sender. I concur with Richard in that while driving the airflow is reduced into the fan bay so it is normal for the temps to be a little higher. Certainly clean the radiator if you see debris on the engine side of the fins and wash from the front to the engine side in reverse to the airflow to keep from embedding dirt further into the core. Check the seal around the door for air flow when you are sitting still, if there is air escaping, fix it so the seal makes contact by whatever means necessary. Look inside the box for any holes, sometime PO repair personnel cut holes in the back for access and their access panel may be letting air escape.
Back to the sensors, if you pull off the bullet connector from the HWT switch and take the wire to a ground point with the engine running the engine should stop. there may be a ten or so second delay or it may be instantaneous. If it does not stop your controls are at fault. If it does then your sensor may be faulty, not a common occurrence but can happen. They are not terribly expensive and can be tested if removed. The sensor connects the bullet pin the the threads (ground) at the set point which is ~220 degrees F.
The gauge is probably your high reading culprit, they are not terribly accurate. They work by applying 12V to the gauge and the sensor is a variable resistor to ground. The higher the temperature the lower the resistance, therefore the more the gauge needle moves to the right. If while the engine is running, the wire lead is grounded, the gauge should go full scale. Dakota digital sells a pretty accurate direct replacement. The wiring is the same, no additional wires needed and the gauge is 2" to fit your cutout.
Richard also make a good point about your belt, check it's condition. He has also posted elsewhere on this site a P/N for a direct drive blower.
Back to the sensors, if you pull off the bullet connector from the HWT switch and take the wire to a ground point with the engine running the engine should stop. there may be a ten or so second delay or it may be instantaneous. If it does not stop your controls are at fault. If it does then your sensor may be faulty, not a common occurrence but can happen. They are not terribly expensive and can be tested if removed. The sensor connects the bullet pin the the threads (ground) at the set point which is ~220 degrees F.
The gauge is probably your high reading culprit, they are not terribly accurate. They work by applying 12V to the gauge and the sensor is a variable resistor to ground. The higher the temperature the lower the resistance, therefore the more the gauge needle moves to the right. If while the engine is running, the wire lead is grounded, the gauge should go full scale. Dakota digital sells a pretty accurate direct replacement. The wiring is the same, no additional wires needed and the gauge is 2" to fit your cutout.
Richard also make a good point about your belt, check it's condition. He has also posted elsewhere on this site a P/N for a direct drive blower.
Gordon Jones
2000-45'-2slide-#567