🔍 Key Concepts

• This is a pressure‑compensated variable displacement pump – as system (high‑side) pressure rises, the control works to reduce the pump stroke/tilting box angle to limit pressure. • Trace how oil from the high‑pressure transmission sensing port moves spool H–G and then how that motion is transmitted mechanically through D and E to the tilting box control arm. • Compare which choices describe the tilting box angle being reduced versus increased, and which ones actually match the direction of motion shown in the illustration.

💭 Think About

• Start at the high‑pressure transmission sensing port: if pressure increases, which way will the small piston by H move, given the opposing spring on the right? • When H–G shifts, does it allow replenishing‑pump oil to keep flowing, or does it throttle/block that flow and vent to drain? How would that affect the force on the large control piston tied to link D? • If link D is pulled in the direction shown (clockwise or counter‑clockwise), does that move the tilting box toward maximum angle or back toward neutral (reduced displacement)?

✅ Before You Answer

• Verify which labeled part actually senses high‑side pressure (J/H area) and which part is the set‑point spring (F). • Confirm which parts are in hydraulic control (G, H, J) and which are purely mechanical linkages (D, E) to the tilting box. • Check that the statement you pick shows the control acting to reduce pump displacement/tilting box angle as pressure rises, not increase it or simply "re‑establish" the original angle.