🔍 Key Concepts

• Study how component G is positioned relative to the moving parts D, E, and F in all three views (front, top, side). • Think about whether G turns continuously with the crank/shaft, or only acts when the mechanism reaches an end position. • Compare each answer choice with what a small roller mounted at the end of the reversing device would realistically do in a hydraulic or pneumatic control system.

💭 Think About

• Does G look like it is part of the main rotating train (crankshaft, connecting rod), or more like a small cam/roller associated with a control or detent mechanism? • Which choice describes a control function (holding or positioning) rather than a power function (developing pressure or carrying main alignment loads)? • If F is moving back and forth, how would the presence of G change that motion or its limits?

✅ Before You Answer

• Verify whether G is actually in contact with component F, or instead bears against a separate surface or cam profile. • Check if there is any passage or port from G leading to fitting H; if not, that rules out a pressure‑developing function. • Ask yourself which choice best fits a blocking / detent role that would keep the reversing mechanism from drifting out of its end positions.