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D5H first hour run 170 then heat to 200

I have a D5H dozer that will run at about 170 degrees for the first 30 min to 1 hour and then it will heat up to 200.  I have been told 200 is ok and told that it is not.  So that is the first question is this a safe operating temp?  I have used an infrared scanner and found that the transmission cooler gets to 200 first and then that is causing the engine to run at 200.  Any recomendations?