I have had a L1801 for quite some time now. I decided to do a hydraulic fluid and filter change because I was getting some jumpy motion from the lift. I did remove the top off the read diff under the seat and also replace the piston o-ring. Drained the fluid and pulled the cover for the filter off and there was not one. Do you think I need to pull anything apart and check for crud, like the control valve under the seat since I was getting some jerking in the lift arms. You could feel it thumping in short burst if that make any sense. Just wanted to get your opinion.
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