Narrative:

After takeoff the engine #1 hydraulic low pressure light illuminated upon gear retraction. The appropriate QRH procedures were accomplished and the aircraft returned for an overweight landing with a normal touchdown. The aircraft was taxied back to the gate where the appropriate logbook entries were made. The left engine hydraulic pump failed.

Google
 

Original NASA ASRS Text

Title: B737 Captain reported a return to the departure airport following a #1 Hydraulic Pump failure after takeoff.

Narrative: After takeoff the Engine #1 Hydraulic Low Pressure light illuminated upon gear retraction. The appropriate QRH procedures were accomplished and the aircraft returned for an overweight landing with a normal touchdown. The aircraft was taxied back to the gate where the appropriate logbook entries were made. The left engine hydraulic pump failed.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.