Did the piston come out of the cylinder? If not, the "short rod" did its job.
In any event, always replace the cam follower pin and Piston O-ring and back-up washer anytime the lift cover is removed. After doing this, readjust the linkage using the alternative (special tools not needed) procedures in the FO-20 manual. If you find insufficient threads on the turnbuckle to achieve proper draft control adjustment, replace the draft control fork.
You should thoroughly clean the sump and replace the hydraulic oil.