1. Feel free to consult me if you have any problem.
(consult - to seek advice or information, to refer to,言意之下如果人家consult你的话,你是能帮他解决/回答问题的)
2. Please don't hesitate to speak to me if you have any question.
(speak to me - 跟我说、告诉我的意思)
第一句比较专业,第二句比较亲切。
看你是用在哪里了。交流的话建议第二句,当然也有其他翻译,如“Feel free to ask me if you don't understand”。
Please feel free to consult me if you have any problem.
相信我,我申请美国学校的时候,他们那边就这样回我的
Say directly if you have any problems.
Please feel free to consult me if you have any problem.
这个答案是对的。
please don't hesitate to speak to me if you have any question