Contaminants can enter your gearbox oil by means of vents or perhaps the fill tube during checking/filling. Usually, nevertheless, contaminants are the result of normal wear. The gearbox filter shields versus these contaminants which can help strengthen gearbox life. On the list of 1st issues you should do is check https://filtergearbox37913.actoblog.com/34780708/getting-my-filter-gearbox-to-work