🔍 Key Concepts

• hydraulic accumulator function in a starting system • difference between an engine-driven pump and a hand or electric pre-charge pump • how hydraulic pressure is used to drive a hydraulic starter motor

💭 Think About

• In a hydraulic starting system, when is the accumulator pressure actually used, and what happens to that pressure right after the engine starts? • If a pump is engine-driven, is its primary job done before or after the engine is turning on its own power? • Which component physically engages with the flywheel in a hydraulic start: the pump, or another hydraulic device that the pump supplies?

✅ Before You Answer

• Identify which component actually meshes with or turns the flywheel in a hydraulic starting system. • Decide at what point in the sequence the engine-driven pump can begin to operate (before start, during cranking, or only after the engine is running). • Clarify the role of the accumulator: does it need its pressure restored or maintained after a start, and which choice describes that function most accurately.