Where is the high idle screw on a caterpillar 3406b?

The high idle screw on a Caterpillar 3406B engine is typically located on the fuel injection pump. It can usually be found on the side of the pump, often marked with a label or an identifier. To adjust it, you'll need a screwdriver to turn the screw, which adjusts the engine's maximum idle speed. Always consult the engine's service manual for specific instructions and safety precautions.