Ford 4000D SOS

Gene Sage

Member
Bought 4000D with SOS out. Guy had it on a generator overnight and it ran out of oil. Had a buddy work on it, spent $2,500 on it and it still didn't work. Something designed in the early 50s can't be that complicated, right? Wrong! Started disassembling trans on work bench with aid of double clutch manual. Found shop rag and large snap ring from clutch pack in bottom of case. This guy should not be allowed to own wrenches. Started from bare case reassembling bringing everything up to specs ,replacing as nessary. Installed trans in tractor and it still didn't work. Three gauges weren't even close to correct readings. Looking at box of spare parts discovered a control valve assembly. It was not the same as one in tractor. Stupid apparently thought the assembly was the culprit and replaced it with one fron the sprag clutch model. Installed correct one now pressures are perfect with only minor tweaking. Trans now happy. Motor had some roughness to it so sent Roosa master and injectors to pump shop. Now motor is happy. Did complete restoration. If time, sweat and blood were of value, this is one expensive tractor. Between 16.9 rears and 2600 RPM this little guys Moseys down the road. Everything works, it's as near perfect as I can get it. I think it's cute and will probably out live me!
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Your rig must have been worked on by the same dude who went through the NAA trans I'm working on. Multiple parts installed backwards, seals that looked like they were driven in with a rock, bolts too long and bottoming out, bearing preloads nowhere near correct, it was really bad.

By the way, how do you overhaul an SOS by using a double clutch manual?
 
Sorry Bern, should have said direct drive clutch manual. Good you guys keep everyone honest. There are some really knowledgeable guys on this site
 
Good work! It took some courage to tear into an SOS tranny armed with just a shop manual, but the manuals from those days were well written (unlike today!). Tractor looks real nice, and sounds like everything now works right. I know what you mean about the tractor probably outliving you, I have had that thought about mine and many other things around here. I hope the next generation cares for them as well as we do! Nice machine! -Will
 

Wow! That machine looks great, and a tip of the hat for diving into a sick SOS transmission. I've got a 1961 871 SOS with about 3,300 hrs. on it, and still going strong. Always wanted the diesel version, though.
 

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