🔍 Key Concepts
• Hydraulic reservoir flow paths – one fitting feeds the pump suction, another returns oil under pressure back into the tank.
• Strainer location (H) – the line connected to the suction strainer is the low-pressure suction side, not the high‑pressure return.
• Tank top fittings (A, B, C, D) – compare which ones connect to internal piping and which simply open into the tank (vent/filler vs. return line).
💭 Think About
• Trace the oil path: from the reservoir, through which labeled connection does oil leave to the pump, and through which does it come back after doing work?
• Look closely at which labeled connection is attached to the internal pipe leading to the strainer. Would that be suction or return?
• Among A, B, C, and D, which one is most likely to be a vent/filler (open to atmosphere), and which one would be a line carrying pressurized oil back into the tank?
✅ Before You Answer
• Identify which letter is directly connected to the pipe and strainer assembly (H) – that is the suction, not the high‑pressure return.
• Confirm which top connection appears to have no internal standpipe or strainer attached, suitable for pressurized oil returning to the free surface in the tank.
• Make sure you do not choose a fitting that is clearly a vent or filler cap (usually has a breather or cap style, not a hose connection).