A DORNIER 200 ON TKOF CLB AT 500 FT EXPERIENCED LOSS OF MAIN HYD SYS CAUSED BY THE MAIN HYD SYS PUMP FAILURE.

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FLT WAS FROM AZO TO PIT; XA45; OCT/XA/99. ON TAXI OUT; WE RECEIVED A HYD MAIN TEMP HIGH CAUTION ANNUNCIATOR SYS MESSAGE. WE CALLED COMPANY AND STARTED CHKLIST. THE PROB CLRED ITSELF AND MAINT CLRED US TO GO OVER THE RADIO. IMMEDIATELY AFTER TKOF WITH GEAR IN TRANSIT; WE RECEIVED HYD MAIN PRESSURE LOW CAUTION ANNUNCIATOR SYS MESSAGE; HYD MAIN PUMP FAIL CAUTION ANNUNCIATOR SYS AND NORMAL BRAKE PRESSURE LOW CAUTION ANNUNCIATOR SYS MESSAGE. WE ASKED DEP TO LET US LEVEL OFF; GIVE US VECTORS AND LET US TRY TO CORRECT PROB. WE RAN THE HYD MAIN PUMP FAIL CHKLIST AND CONTACTED COMPANY THROUGH AZO OPS. DURING THIS TIME WE WERE TALKING TO MAINT TO DETERMINE WHERE TO GO. ACCORDING TO OUR TABLES AND DUE TO LACK OF BRAKES AND FLAPS WITH HYD FAILURE; WE DETERMINED TOL WAS OUR BEST CHOICE WITH 10000 FT RWY AND FIRE AND EMER FACILITIES ON FIELD. WE ASKED FOR VECTORS TO TOL. PRIOR TO THIS; BY RUNNING CHKLISTS; WE WERE ABLE TO GET GEAR DOWN AND LOCKED. THEY HAD BEEN -- AFTER TKOF; NOSE GEAR UP AND LOCKED AND 2 MAIN GEAR IN TRANSIT. BY PUTTING GEAR HANDLE DOWN WE GOT 2 GREEN IN MAIN GEAR; BUT NOSE GEAR STAYED UP AND LOCKED. WE THEN PUMPED DOWN THE NOSE GEAR AND SUCCESSFULLY ENDED WITH 3 GEAR DOWN AND LOCKED. ON THE WAY TO TOL WE DECLARED AN EMER AS A PRECAUTION DUE TO THE LACK OF FLAPS AND BRAKES WITH HYD FAILURE. WE HAD ALL NORMAL INDICATIONS FOR THE GEAR. WE DID A FLY-BY OF THE TWR IN TOL AS VERIFICATION AND THEN MADE A NON EVENTFUL LNDG AT TOL. WE OFF-LOADED PAX ON THE RWY AS WE WERE UNABLE TO TAXI WITHOUT BRAKES. ONCE ON THE GND WE ACTIVATED THE STANDBY SYS AND FOUND IT TO BE WORKING; BUT THE MAIN PUMP WAS INOP; IT HAD FAILED.