z Start engine The speed control unit governed speed setting is factory set at approximately engine idle speed. Crank the engine with DC power applied to the governor system. The actuator will energize to the maximum fuel position until the engine starts. The governor system should control the engine at a low idle speed. If the engine is unstable after starting, turn the GAIN and STABILITY adjustments counterclockwise until the engine is stable. z Governor speed setting The governed speed set point is increased by clockwise rotation of the SPEED adjustment control. Remote speed adjustment can be obtained with an optional 5 K Speed Trim Control.
(See Diagram 1.) z Governor performance Once the engine is at operating speed and at no load, the following governor performance adjustment can be made. (1) At no load, turn the gain control CW until instability results. Then back-off slightly CCW (1/8 turn) beyond the point where stability returns. (2) Turn the stability control CW until instability results. Then back-off slightly CCW (1/8 turn) beyond the point where stability returns. Excellent performance should result from these adjustments. If instability cannot be corrected or further performance improvements are required, refer to the section on SYSTEM TROUBLESHOOTING.
z Starting fuel adjustment The engine’s exhaust smoke at start-up can be minimized by completing the following adjustments. (1) Place the engine in idle by connecting Terminals M & G. (2) Adjust the IDLE speed for as low a speed setting as the application allows. (3) Adjust the STARTING FUEL CCW until the engine speed begins to fall. Increase the STARTING (4) Stop the engine FUEL slightly so that the idle speed is returned to the desired level. Maintenance of Major Components - 111 -