Get out our ESSENTIAL MANUALS -all shown have diagrams and rebuild processes except the Den Carpenter one which is for parts. Don't have any? So ya wanna be an N tractor owner, get them -best tool investment you'll make. LIFT TEST: Attach a load like mower or back blade; Start up; engage PTO; Place in POSTION CONTROL; Raise load UP to full extent of touch control quadrant; Leave UP and shut down engine. Note height of load when UP. Watch or come back every 15 minutes. A worn/weak system will drop within minutes, hours, or a day. Repeat process only once load is UP and tractor off, remove side inspection covers, take your Min-Mag and look way up underneath the top cover at the cylinder (it's beneath the seat); observe oil seeping down around the piston and cylinder. Yes, I see it? Your cylinder is worn and needs replacing along with a new piston, p/n NAA-530B. The top cover needs to be pulled and there is right way and several wrong ways to do it. While you are at it, may need to drop the pump for total inspection and rebuild. With covers off, start engine, keep those hands out of there, and observe if you see bubbles gurgling in the bottom of sump. Yes? Your pump base is cracked and needs replacing. No? Since your pump has probably never been dropped, cleaned, inspected, and rebuilt before, I advise to drop pump and rebuild totally at this time. This isn't a difficult project, just time consuming and lifting the top cover will require a helper. You don't want to have to do it over again so do it right the first time. There is a gasket kit you'll need, a new piston, and new cylinder (don't reuse old one, trust me) as well as safety relief valve, chambers and parts. Email me for more - I have a document on the other Ford N Tractor site.
FORD 8N TRACTOR ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS: