The **automatic transmission mechanical oil pump** is crucial for:

1. **Hydraulic Pressure** – Generates flow to engage clutches/bands.

2. **Lubrication** – Protects gears/bearings from wear.

3. **Cooling** – Circulates ATF to dissipate heat.

4. **Torque Converter Operation** – Supplies fluid for power transfer.

Powered by the engine (via input shaft), it ensures smooth shifts & longevity. Failure = no pressure = transmission breakdown! ⚙️