COUPLING AS-PERMANENT 3236163 - Caterpillar

Causes Of System Overheating
Use the following as a guide to check the machine system. Any of the listed conditions can cause true system overheating.
Engine Coolant
1. High ambient temperatures. May require system modifications for high ambient temperature operation.2. External radiator plugging.3. Internal radiator coolant restrictions (lime buildup).4. Low coolant flow caused by a worn pump or restrictions in coolant passages.5. Very high duty cycle machine application. May require high ambient cooling modifications. Example: High loads with short cycle time.6. Incorrect machine operation caused by operator inexperience.Torque Converter Oil
1. High ambient temperatures. May require system modifications for high ambient temperature operation.2. Plugged cooler core.3. High engine coolant temperature.4. Very high duty cycle machine application. May require high ambient cooling modifications. Example: High loads with short cycle time.5. Incorrect machine operation caused by operator inexperience. Example: operator spends too much time in converter stall while loading the bucket.Hydraulic Oil
1. High ambient temperatures. May require system modifications for high ambient temperature operation.2. Plugged cooler core (internal/external).3. Low oil level (causes poor tank cooling).4. Very high duty cycle machine application. May require high ambient cooling modifications. Example: High loads with short cycle time.5 Incorrect machine operation caused by operator inexperience. Example: operator spends too much time in hydraulic relief.Trouble Shooting
When troubleshooting an overheating complaint, use the following information as a checklist to locate the root cause of an overheating indication before repairs are made.
There are two main reasons CMS, might show a machine system is overheated.
1. The system being monitored is truly overheated. This IS NOT an electrical system fault and WILL NOT cause the SERV CODE indictor in the CMS display to turn ON. This means no service codes are stored in CMS.2. The sensor, machine wiring or CMS Control has a fault. The CMS control can diagnose most conditions relating to sensor or harness condition. A fault condition causes the SERV CODE indicator to turn ON and the temperature gauge should show in the red overtemperature zone. If the CMS control is faulty, the CMS self-test may not complete when the key start switch is first turned ON at startup. If the SERV CODE indicator is ON, service codes are stored in the CMS control that may indicate the temperature sensor has a fault.A sensor fault that the CMS control cannot detect is if the internal calibration of the sensor has shifted. This fault is usually obvious when the engine is cold but the engine coolant temperature gauge shows the temperature as being too high. Another way to detect this fault, is to know the ambient temperature where the machine is parked. Then use the Numeric Readout Mode of CMS to read the coolant temperature in degrees C. If the engine has not been operated for at least one shift, the engine coolant temperature shown on CMS in the Numeric Readout Mode should be within about 3°C (6°F). of the ambient temperature. If the temperatures are not close this could indicate a sensor fault, but may NOT turn ON the SERV