What was found
DURING CLIMBOUT, RT ENGINE DRIVEN HYD PUMP PRESSURE DROPPED (INDICATED) "0" PRESSURE. (LT SYS NORMAL) PERFORMED COM PROCEDURE - RESTORED RT SYS PRESSURE WITH "AUX" PUMP. AT 18,000 FT APPROACH CHECKLIST ALTITUDE, DECLARED AN EMERGENCY WITH APPROACH AS A PRECAUTIONARY MEASURE. UPON LANDING, REMAINED ON RUNWAY TO "PIN" THE LANDING GEAR AS PRECAUTIONARY MEASURE. (TOWER WAS ADVISED) AFTER "PINNING" THE LANDING GEAR, TAXIED TO RAMP. FAILURE OF NR2 ENG DRIVEN HYD PUMP IS SUSPECTED CAUSE OF PROBLEM. MORE TO FOLLOW UPON COMPLETION OF TROUBLESHOOTING.