In Reply to: Gear Oil and Water posted by Tony Sanchez (OR) on November 16, 2017 at 19:44:06:
Water and oil do not mix. As Bruce suggested, the best solution is to drop the pump NOE before you plan on using it and clean out the system like new. The pump could have been cracked and was getting water in long before it sat outside. You need to understand that the 9N/2N system is different than the 8N and NAA systems. Get out your MPC, I&T F-04 manual, and Service Manuals for complete procedure on doing it right. There is a very good DIY video too that will help you step by step -SEE LINK below. We also have info in our HOW-TO's here -one article is on the 8N Hydraulics but will have valuable info that can be used on eth 9N/2N systems. It is very important you know how to proceed before loosening a single nut or bolt. On all 9N/2N and 8N systems, the cylinder is fastened to the top cover with four bolts. These are visible under the seat in the inner bolt pattern. The top cover is fastened on to the center housing with 15 hex head bolts in various lengths so it is important to know which bolt goes where. Best to sketch a diagram when you remove them and mark on the head a number. You DO NOT loosen the four bolts that secure the cylinder onto the top cover until you have the cover off and on your bench. Another very important fact about the 9N/2N system is it utilizes a 'wishbone' bracket linkage and it MUST be removed first before the top cover is pulled off. There are a few good cleaning solvents to use to clean everything with. I prefer plain old Mineral Spirits. It cuts grease, grime, and stubborn crud and will not hurt anything internally. It is the main ingredient in most snake-oil products like MMO, STABIL, KROIL, SEA FOAM and many others. Many use UATF or diesel fuel or kerosene and all work well too. The important thing is that you read the manuals and get this video so you know what you are going to do before wrenching anything. Once the pump is on your bench, you will be able to determine the status of it. If it is cracked, you will need to replace it with a new or rebuilt pump. If it has the original 3-ring piston, consider replacing with the newer NAA piston that uses a rubber O-Ring and leather backup washer/wiper. Chances are the cylinder is pretty well worn as well so I'd think about a new cylinder as well -forget any used cylinders, they will be almost as bad as your old one. Suggest you get your son, daughter, nephew, cousin, or a buddy to help too. Also, as with any project best not to buy any new parts until you know exactly whet you'll need. You will need a new gasket kit and a new piston for sure, and probably a new cylinder but wait and get all the part at one time and place.