THE #1 HYDRAULIC PUMP FOR THE BRAKE GOT WEAK AND COULD NOT PUMP THE REQUIRED 2300 PSI TO SHUT OFF THE HYDRAULIC SYSTEM. THE PUMP CONTINUED TO RUN, CAUSING THE SYSTEM OT OVERHEAT. THIS CAUSED THE TANK PLUG TO MELT AND DAMAGED SENSORS, CAUSING THE SYSTEM TO FAULT OUT. AS A RESULT OF THE FAILURE, THE HOIST WAS INOPERATIVE FOR MORE THAN 30 MINUTES.