It is a pro 60 with a briggs 26hp.I think it could be some loosebolts on the motor but it is tough to tighten by yourselfThat has to be a Ferris PRO 60. Through the years I know of they have different brand engines in them. What engine and model engine do you have in yours? Also how old is your Ferris seeing they have changed the chassis and running gear on them also.