🔍 Key Concepts

• centrifugal force on the flyweights vs speeder spring tension when engine speed drops under increased load • how movement of the floating lever and speeder rod shifts the pilot valve plunger in its bushing • the sequence: pilot valve movement → oil flow to/from power piston → motion of terminal shaft and compensating piston

💭 Think About

• When load is suddenly increased, does the engine momentarily speed up or slow down, and what does that do to the flyweights? Trace the direction of their motion on the drawing. • Follow the mechanical linkage from the flyweights and speeder spring down to the pilot valve plunger. When the flyweights move for a speed decrease, does that push the pilot valve up or pull it down? • Look at the oil passages around the control port. For the governor to increase fuel, must the pilot valve first connect high‑pressure oil to the top or to the bottom of the power piston?

✅ Before You Answer

• Identify which part in the illustration moves first after the load is applied (flyweights / ballhead / speeder rod). • Verify on the drawing which direction of pilot valve travel uncovers the control port to admit accumulator (high‑pressure) oil to the power piston. • Confirm that the actuating compensating piston and terminal shaft only move after the power piston has started its stroke, not as the initial response.