This chain transmits rotary motion from the engine to the hydraulic pump, enabling the pump to generate flow for the tractor's hydraulic system. It engages with sprockets on the pump input shaft and the engine-driven shaft, maintaining synchronization between the two. A worn or stretched chain causes delayed pump response and reduced hydraulic pressure at the implement. This original component is manufactured to the same pitch and tensile strength as the original assembly, so it maintains proper tension without requiring additional adjustment. On installation, verify the chain tension is within specification and replace any worn sprockets to prevent premature wear.