The clutch spring in a TU26 power sprayer serves to engage and disengage the engine’s power to the pump or spraying mechanism. When the operator activates the sprayer, the clutch spring compresses, allowing power from the engine to transfer to the pump. This mechanism ensures that when not in use, the engine does not exert unnecessary force on the pump, which could lead to wear or damage. The clutch spring must be compatible with both the engine and the specific model of sprayer being used. Incompatible parts can lead to inefficient operation or mechanical failure.