'64 Ford 40000 PS gear control valve

Have disassembled subject & have found the following. 1) One broken centering spring. The other springs, 2 balls & plungers, bearings, races & seals look good. Is it highly recommended to replace all 3 springs?

When I called YT about seals kit they asked if it was "orbital control valve"? Well yeah it's round, but FO20 doesn't describe "orbital". So is the orbital kit the correct kit?

When I rotated the steering shaft I could feel considerable resistance about 1/2 way through turn either direction. Too much resistance to rotate w/ pitman arm but could get it to rotate with my hand on the shaft (no steering wheel). So I disassembled & found lots of rust on spacer tooth double sector, cleaned all parts & housing.

2) Steering shaft bearings look good. Sector bushings on the cover look lightly scored & there is about 1/64 play side to side with the sector removed from the housing. Sector shafts are tight side to side but a little end play <1/64" when installed in housing. I didn't find the sector bushing available on YT. There is a diagonal groove on each bushing that looks like a mfg. mark. Is this to gauge replacement? None of the wear marks are as deep as the diagonal groove. How much wear is allowed before bushings must be replaced?

I plan on replacing all the O rings & gasket. I don't have a puller for seals or bushings of this size, but don't mind buying one. If the seals look good, is it ok to leave them? I sure don't want to have to take all this steering stuff off & apart again but not sure that I can get them out & replaced on gear housing cover (top & bottom), adapter (bottom), & gear housing (next to bushing on each sector). I figured the seals could be tappped back in using a socket, but the bushings pressed in using the vise.

Appreciate the help!

Replace all of the seals.

Replace the sector shaft bushings.

Both are available from CNH.

Dean

New springs are available from the CNH dealer for about $34 each. I would just replace the bad one. Might as well buy the two seals and two orings while you are there. They are competetive on prices. Replace the lower seal (below the lower thrust bearing) while you have the column apart. A little pitting on the sector gears isn't the end of the world. They are a low speed gear so no friction wear. Yes replace the sector shaft seals. They can also be had from CNH. Put the seals in first grease good and then install the sector shafts. No special driver needed that way. Can't say about the sector bushings from here. Generally if I can feel any wear by wobbling the shaft in the bushing it is time to replace them. But I've never had to yet.
Get the paper gasket for the top of the lower box too. They generally break apart.
When you get it done replace the oil fill plug with a zerk and pump in two tubes of John Deere corn head grease into the lower case.
You want to buy:
1 X #28 lower seal
1 X #44 upper seal
1 X #24 paper gasket
2 X #18 sector shaft seal
2 X #32 Oring
4 X #17 felt washer

Thanks for your help guys. I'll get the parts ordered.