A B737 RETURNED TO THE GATE DUE TO R ENG DRIVEN HYD PUMP LOW PRESSURE WARNING LIGHT. FOUND PUMP OVERHEATED AND FAILED. CAUSED BY CASE DRAIN FILTER LINE DISCONNECTED.

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I WAS NOTIFIED ON JUN/TUE/06; WHEN I RPTED FOR WORK THAT ACR X RETURNED TO THE GATE DUE TO A #2 ENG HYD PUMP LOW PRESSURE LIGHT ILLUMINATING AND AT THE GATE MAINT FOUND THE #2 EDP HAD OVERHEATED AND FAILED. I WAS TOLD THE EDP CASE DRAIN FILTER LINE WAS FOUND DISCONNECTED AT THE PYLON DISCONNECT. TO PREVENT FLUID LOSS FROM THE CASE DRAIN FILTER MODULE WHILE PERFORMING THE JOB CARD TO CHANGE THE FILTER; O-RING; AND BACKUP RINGS; THIS LINE AS 'COMMON KNOWLEDGE' WAS DISCONNECTED SO FLUID WOULD NOT CONSTANTLY LEAK ON ME AND ENG WHILE PERFORMING THE JOB CARD TASK. NO ISSUES WERE FOUND DURING THE ENG LEAK CHK BUT APPARENTLY I INADVERTENTLY LEFT THIS LINE DISCONNECTED AFTER FINISHING THE JOB CARD. I WISH A STEP COULD BE ADDED TO THE JOB CARD TASK FOR DISCONNECTING AND RECONNECTING THE CASE DRAIN FILTER HYD LINE PYLON QUICK DISCONNECT THAT COMES FROM THE EDP CASE DRAIN FILTER MODULE. THIS IS AN EFFECTIVE AND BENEFICIAL WAY OF STOPPING HYD FLUID FROM LEAKING ONTO THE TECHNICIAN AND ENG COMPONENTS DURING THE JOB CARD TASK.