I used two cans of brake cleaner on my 9N worked fine. When you pull the hydraulic pump you have to remove the PTO shaft and the pump has to slide forward to drop out, (just in case you did not know) I found when I rebuilt my hydraulic pump the sockets were stuck to the bottom of the valve chambers I used a Torx screw driver that fit snug in the hole to pull it out of the chamber. Make sure you disconnect the fork from the control valve prior to removing the pump or you will break the control valve. If you plan to service the Ram cylinder in the top cover pay close attention to the fork position/s note which side they sit on and which way the flat side of the top ears face. Also the spring connects to the eye on the ram cylinder and to the notch on the fork. Hope this helps
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