John Deere 4840 transmission pump prime

Ryan Weiss

New User
My 4840 pump in the transmission will not prime itself at start up. I have to bring engine to full rpm to get it to prime. Sometimes it does, sometimes it will not. I changed filters, and sump screen. Anyone have this problem? When it does take off, pressures and flow is where it needs to be.
 
Having this problem on cats I found that it could be one of two things the pickup tube is sucking air or the pump is worn and needs to be replaced.
Walt
 

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