400 lost Hydraulics after changing fluid

Kris M

Member
After draining the hydraulic fluid to put new fluid I lost hydraulics. They worked just prior to draining the fluid. I also cleaned the strainer. When I started the tractor there were no hydraulics even after moving the levers back and forth several times. Any help would be great.
 
Several people per year have this happen. Efforts have included repeated lever movement for 10 minutes or more, Putting 20psi air pressure in the reservoir, and loosening the output fitting to allow air to escape. Good luck. JimN
 
All the pumps on my SMTA's and 400's have a spring loaded bleeder on top of the pump. Although it is in plain view, it is sometimes not easily observed or identified due to dirt, grease, or paint. It is flush with the surface.
 

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