What was found
AFTER TAKE OFF RECEIVED, GEAR DISAGREE MESSAGE, QRH WAS COMPLETED, AND THE EMERGENCY HANDLE WOULD NOT STOW. HYD 3 WAS NOTED AT 90 PERCENT BUT TEMPERTURE UNKNOWN. AT THE GATE HYD 3 WAS AT 70% AT 81 DEGREES. PILOTS STATES MAIN LANDING GEAR WORKED CORRECTLY, BUT THE NOSE LANDING GEAR DID NOT RETRACT. NO EMERGENCY WAS DECLARED.