The shift selector valve supplies main pressure to the ___________valve, which directs that pressure to the corresponding shift signal valve depending on the driver's gear selection.

The shift selector valve supplies main pressure to the ___________valve, which directs that pressure to the corresponding shift signal valve depending on the driver's gear selection.

• A. Hold regulator
• B. Shift modulator
• C. Trimmer regulator
• D. Priority

Answer: (A)

The main idea is how hydraulic pressure is routed to make a gear shift. The driver’s gear choice is interpreted by the shift selector valve, which takes the main system pressure and sends it into the hold regulator. The hold regulator meters and stabilize that pressure so it’s consistent, then it passes the regulated pressure on to the appropriate shift signal valve for the selected gear. That regulated pressure powers the correct clutch or servo to engage the gear smoothly. Other valves have different roles in the system: the shift modulator affects how the shift happens but isn’t the direct pass-through to the shift signal valves; the trimmer regulator tunes pressure in other circuits; the priority valve mainly maintains adequate pressure in the system at low flow, not the direct supply to the shift signal valves.

The main idea is how hydraulic pressure is routed to make a gear shift. The driver’s gear choice is interpreted by the shift selector valve, which takes the main system pressure and sends it into the hold regulator. The hold regulator meters and stabilize that pressure so it’s consistent, then it passes the regulated pressure on to the appropriate shift signal valve for the selected gear. That regulated pressure powers the correct clutch or servo to engage the gear smoothly. Other valves have different roles in the system: the shift modulator affects how the shift happens but isn’t the direct pass-through to the shift signal valves; the trimmer regulator tunes pressure in other circuits; the priority valve mainly maintains adequate pressure in the system at low flow, not the direct supply to the shift signal valves.