The visitors scored six tries to two, including doubles to wingers George Bridge and Manasa Mataele, while five-eighth Mitch Hunt scored 13 points.
The bonus-point win lifts the Crusaders to one point behind the Lions at the top of the overall standings through eight rounds.
They narrowly lead the New Zealand conference from the Hurricanes and the Chiefs.
A third-straight win was the Crusaders' eighth in a row at an offshore venue.
The only team to have won a final overseas, the Crusaders have built their eight titles on an ability to travel.