What was found
HYDRAULIC PUMP ON INDICATION CAME ON. TRIED TO DEPLOY LANDING GEAR AND IT WOULDN'T EXTEND. HAD TO PULL EMERGENCY GEAR EXTEND. JACKED AIRCRAFT, APPLIED POWER TO HYDRAULIC PUMP SELECTED GEAR UP, FAILURE CONFIRMED. RELAYS ACTUATED BUT PUMP DID NOT TURN ON. GRASPED NEGATIVE TERMINAL ON PUMP, FOUND PLASTIC TERMINAL WAS LOOSE IN PUMP HOUSING. DURING THIS ACTION THE PUMP TURNED ON. AT THIS TIME THE GEAR UP AND DOWN WORKED NORMALLY. CORRECTIVE ACTION IS TO REPLACE THE PUMP DUE TO LOOSE TERMINAL BLOCK. BLOCK FITTED INTO PUMP HOUSING, NO MEANS TO TIGHTEN.