thanks with everything up and in I added the fluid to the 'full' line on the tank since posting the thread i actually extended the jack with the grinding noise and then kept extending it and the noise stopped and jack extended normally (very slow moving jack when hearing the noise) but next time I extended jack noise was back so I am thinking air in lines like suggested, will try to call Lippert
so helpful having this forum, first time posting however have been a member for two years, usually can find answer to my questions by reading earlier posts.
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