FITTING 0343679 - Caterpillar

Improper engine operation is often the result of factors other than governor operation. This chapter gives tips about engine problems which can resemble governor problems. Make sure the engine is operating correctly before making any changes in the governor.Attempting to correct engine or load problems with untimely governor adjustment can make problems worse.If possible, isolate the governor from the engine to determine if the problem is with the governor and not with the engine or the load on the engine. Governor faults are usually caused by installation problems or the linkage between the actuator and the engine. Carefully review all the wiring connections, the power supply, and the linkage before making any adjustments to the actuator or driver. Always check the fuel-control linkage from stop to stop as if the actuator were moving it. The linkage must move freely without friction and without backlash. Some fuel controls will present problems at particular fuel or rack position because of a hesitation or binding in the linkage.Fuel supply and injector conditions can also present problems which resemble governor problems.On spark-ignited engines, distributor, coil, points, and timing problems can all cause improper operations which may resemble faulty governor control. Linkage and Actuator Stroke
Use as much of the 75 degrees of actuator stroke as possible. Carefully follow the guidelines in the Actuator Installation section of Chapter 3 in making linkage arrangements. Using less than optimum actuator movement will make stability more difficult, and will make the actuator more sensitive to external loading forces and friction.Possible problems with driver-actuator system include: