ADAPTER-EXHAUST 1440605 - Caterpillar

Needle valve location.The needle valve (see the illustration) is used to adjust actuator stability. The needle is factory set at two turns out (counter clockwise) from closed. If adjustment is required, use the procedure that follows.
1. With the engine running at normal operating temperature, adjust the governor gain and stability to get acceptable engine performance and stability. See the Service Manual, 2301 Electric Governors, Form SENR2928.2. Stop the engine and let it cool down to ambient temperature.3. Start the engine. If the speed is unstable at start-up, turn the needle valve clockwise to increase actuator response time (increase stability). The engine should not be operated with the needle valve less than 3/4 of a turn from the clockwise stop (closed position).