In Reply to: Hydraulic rebuild. 9N posted by Zeke Duge on July 12, 2020 at 20:05:56:
Shaking/fast drop are sure signs of a worn cylinder and system. Get your manuals out and understand how the top cover is removed 9N's are different than 8N's. The leak down test will confirm but your evidence already leans too the problem. Don't know who you are looking at for parts, most of us buy from DENNIS CARPENTER or JUST8N's for reliable parts and decent prices. You'll need a new cylinder, piston with O-Ring type, safety valve, and gasket kit. You can do the work yourself just follow instructions. Get DIY articles and more in our HOW-TO's. Get the self-help video from J&M Productions - see LINK. Watch and read all of these before you grab a wrench. there are right ways and wrong ways to do the job.