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Tim PloughNman Daley
11-15-2023 05:17:54
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Re: 8N Hydraulic system in reply to Rodney51Cub, 11-14-2023 19:10:01
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Mineral Spirits is an excellent petroleum based solvent with multiple purposes including cleaning and dissolving grease, dirt, and grime and will not harm internal engine, oil, and hydraulic systems. It is the same 100% stuff used in paint thinner and charcoal lighter fluid as well as up to 99% of the main ingredient of most all 'snake oil' products like MMO, STABIL, KROIL, STAR-TRON, TECHRON, and many other products. Review your MSDS sheets if you doubt. Also, a 50/50 mix of Acetone and UTF works well too. There are THREE drain plugs on the underneath of the tractor for trans/hyd oil. The first to drain is the NPT plug on the diffy case. It has a 9/16 Square Head and is often hard to loosen as many have never been removed since birth. Work your way north to front of engine with the other two. I highly advise you consider performing an total rebuild. Chances are the tractor has never had one. A basic draining probably won't do much good as it is. Chambers are likely gunked up, worn, and some wear parts need replacing like the Safety Relief Valve and Cam Follower Pin. I'd replace the cylinder and piston as well which requires you pull the top cover. Your Owner's Manual, I&T F0-4 Manual, and a Dealer Service Manual are required reading and reference to do the job. It is one of the toughest jobs to PM on the tractor, time consuming, and can be pricey depending on what you want and can afford to do. A complete rebuild kit can cost at least $500. Evaluate you situation and proceed from there. I wrote a document 20 years ago on rebuilding the 8N hydraulic system so if you want a copy, my email is open.    
 Tim Daley (MI)
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