There should be a 3/8" allen head pipe plug in the top of the hydraulic pump. Remove that, then crank the engine with the shutoff pulled out or the coil wire removed... when you get clear oil coming out reinstall the plug. Should be good to go at that point. If it still doesn't work then you may have problems with the unloading valve or the flow control valve... or blown O-rings somewhere under the lift cover... but given it only started when you changed the oil, it's most likely just air locked.
Also... the flow control does control the speed of lift, not drop. Drop is unrestricted on those things other than what control you are afforded by the lift lever.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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