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NAA Sector Gear Bushings Too Tight

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Ramrod

01-05-2005 20:33:23

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I finally got my shims for the sector gear adjusters, and sat down to assemble my now rebuilt steering box only to find out that my bushings which looked and installed just fine are too tight on the ID for my sector gear shafts to pass through. I think I'm gonna have to machine something, but what? Can I use a brake cylinder hone to take a few thousands off the ID of the new bushings, haven't mic'ed it, but it should only take a couple to make it work, as it will go in a bit and then bind. I have polished the shafts on the sector gears with wire brush and emery cloth, they're clean and shiney, and have checked the bushings for burrs and even polished the edges to make sure the entry is clean. Would I be able to take a bit off these shafts by chucking them in a drill press and using fresh emery cloth on the spinning part? That seems like a bad idea for several reasons, but what else to do? These bushings are hard to find, and FNH doesn't supply OEM versions anymore they tell me.

Ramrod

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Ramrod

01-06-2005 06:42:31

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Re: NAA Sector Gear Bushings Too Tight in reply to Ramrod, 01-05-2005 20:33:23

I got to thinking about this on my way to the office, and called another FNH out in the country (Decatur, TX). Parts Guru Joe had the long bushings, and right away found a pair of the 'discontinued' short bushings at a dealer in NY state. The long ones are $16, the short ones will be a little less, but I'm betting they'll fit perfectly, and I'm sure gonna test fit them on his counter before I buy 'em. This could be another after-market parets lesson learned the hard way.

Ramrod

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don b

01-06-2005 11:47:12

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Re: NAA Sector Gear Bushings Too Tight in reply to Ramrod, 01-06-2005 06:42:31

ALL THESE PARTS ARE AVAILABLE IN N.CAROLINA [6.00]with out the bad advise you recieved from guru Joe.The part number you need for your Naa is two 8n3576-b [short .840].You would also need two 8n3553 bushings for the sector housing.The 8n3576-a [long 1.500][4] was ONLY used in the early 8n steering box. don b

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Dan

01-06-2005 07:39:51

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Re: NAA Sector Gear Bushings Too Tight in reply to Ramrod, 01-06-2005 06:42:31

Make sure they are not the shorter sector end cap bushings - they have a larger ID than the sector housing bushings.

Dan

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souNdguy

01-06-2005 04:55:54

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Re: NAA Sector Gear Bushings Too Tight in reply to Ramrod, 01-05-2005 20:33:23

I think I'd try the brake hone idea on the bushings.

Also. I think I'm gonne rebuild the steering in my NAA. I have a feeling my top thrust bearing has eiother been replaced with a cheapo nylon one.. or is beginning to go south.. as I can get a little rise out of the wheel and a tad harder steering when going left.

Question.. It's been along time since i had my sheetmetal off the NAA for painting. i cant remember if that center dash and cowling will come out seperate from the hood side 'torpedo panels' or not. I know they are seperate pieces.. but if I merely unbolt the sid epanels at the rear.. will I have enough clearance to pull the dash, and battery tray, and then pull the steering apart or do I really need to strip all the metal off? Reason I ask is it will make a difference where I do the work. If only a little room is needed.. I'll do it in my cozy garage.. if I need room to remove a hood.. it will be in the barn... wher ethe 8n is setting as I finish it's steering rebuild ( hopefully friday ).

Also.. any idea what the top and bottom thrust bearings, and the top bearing in the steering tube ran you?

One more question.. Is the steering wheel the same one as on the 8n? ( same spline and hub size?) I'm thinking of replacing my wheel at the same time.

Thanks

Soundguy

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Dan

01-06-2005 06:33:16

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Re: NAA Sector Gear Bushings Too Tight in reply to souNdguy, 01-06-2005 04:55:54

Sounder, as far as the NAA dash, it can be removed seperately with the big side panels and hood still on the tractor, but you will need to rig a way to hold the side panels up when you pull the dash - that is what supports it in the back end. You will also have to remove the throttle from the bracket hooked to your bell housing, as well as the key switch for the ignition.

As far as the thrust bearings, the top bearing cost me $12 and the cup that presses into the bottom of the steering tube ran $7. My bottom bearings and cup were in great shape so I didn't replace them. The bearing that presses into the top of the steering tube close to the steering wheel was $25. The steering wheel is the same as an 8N. I got my supplies from Don B.

One word of advice I found out last night while assembling my NAA steering box, if you are planning on replacing the sector arm oil seals, you will have to pull the old seals out. There is room to mate the new seal up next to the old, like I did on my 48 8N, but the new seal lip will be running on the splines of the sector arm.

Good luck,
Dan

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Ramrod

01-06-2005 05:34:37

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Re: NAA Sector Gear Bushings Too Tight in reply to souNdguy, 01-06-2005 04:55:54

The bearing and seat fron FNH were 8N3553/8N3571 @ 13.19/18.50. The top shaft bearing assembly C5NN3N716A was 45.60. I can't help you with the sheetmetal. mine had 600 sheetmetal on it, so it all came off in one piece and was set aside. Anybody need it?

Ramrod

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souNdguy

01-06-2005 06:08:00

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Re: NAA Sector Gear Bushings Too Tight in reply to Ramrod, 01-06-2005 05:34:37

I've been helping a fellow with a 640 that is looking for sheetmetal. I'll ask if he is interested in buying it.

Soundguy

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Ramrod

01-06-2005 06:37:42

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Re: NAA Sector Gear Bushings Too Tight in reply to souNdguy, 01-06-2005 06:08:00

I forgot to tell you that you'll need two each of the bearings/races, and if you're going from nylon back to steel, you'll also need the retainer/eyelet 8N33546/356937-S to secure the lower bearing to the shaft.

Ramrod

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souNdguy

01-06-2005 05:05:43

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Re: NAA Sector Gear Bushings Too Tight in reply to souNdguy, 01-06-2005 04:55:54

Well.. duh.. ok.. I know the steering wheel is the same.. ( guess I shoulda hit the MPC a little harder (GRIN). Must need more coffee!

Soundguy

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Dan

01-06-2005 04:53:07

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Re: NAA Sector Gear Bushings Too Tight in reply to Ramrod, 01-05-2005 20:33:23

Seems like we are on the same project once again. I got my steering box rebuild parts in last night and spent my evening putting mine back together as well. I ran into some problems as well, but not as bad as yours. My bushings were fine, so I left them alone. But I did discover you cannot leave the old sector oil seals in and but a new oil seal next to it. The new seal lip will just run on the splines - and of course you destroy the new seal getting it out. Another $11.50 wasted for education"s sake...

Tha I&T manual says these bushings should have a bore diameter of 1.245 - 1.250. I do not know if you have the equipment to get that detailed, but this would tell you if you got the right parts. Did you test fit one before you installed it? This might tell you if it got deformed while you were driving it in. I do not think you could find a brake hone that small, at least the smallest brake hone I have seen was larger than this. I wonder if Dremel makes anything that would work here? I"m sure you could also use some super fine wet/dry sandpaper, but that would be a chore.

Good luck,
Dan

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Ramrod

01-06-2005 07:01:48

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Re: NAA Sector Gear Bushings Too Tight in reply to Dan, 01-06-2005 04:53:07

You gotta look for brake cylinder hones, they cover the small stuff. I do have a mic, I'll do the math tonight if it ain't too cold in the garage. My kerosene heater is down, waiting on parts. I still need to figure out the seal thing with my new style o-ring type seals fron FNH. They nest two of these on each side. Did Don B sell you this type?

Ramrod

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Dan

01-06-2005 07:46:37

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Re: NAA Sector Gear Bushings Too Tight in reply to Ramrod, 01-06-2005 07:01:48

Nope, If you are talking about the sector shaft oil seals, I got the thin one piece seal that looks just like the ones I put in my 48 and 52 8N. If you are in a hurry, I found you can get these at NAPA as well for a shade over $5. The part number is NOS 11055. I am picking up some today because I have to dig the other ones back out to remove the original seals - then re-install new new ones again. Live and Learn.

Dan

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don b

01-06-2005 07:20:53

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Re: NAA Sector Gear Bushings Too Tight in reply to Ramrod, 01-06-2005 07:01:48

Ramrod, give me a call or mail. don b

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Hobo,NC

01-06-2005 06:34:28

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Re: NAA Sector Gear Bushings Too Tight in reply to Dan, 01-06-2005 04:53:07

did ya try and drive the old seal in further. I removed my old seal with not damage'n it installed the new seal and drove the old seal on top of it no problem

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Dan

01-06-2005 07:50:22

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Re: NAA Sector Gear Bushings Too Tight in reply to Hobo,NC, 01-06-2005 06:34:28

I "tried" to drive the old seal in further, but it was snugged up against the sector housing bushing. I did not try to push the seal *and* the bushing back further, for fear I would bugger something up. I do not know how tight these bushings snug up in the housing.

Thanks,
Dan

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Fessman

01-05-2005 20:53:42

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Re: NAA Sector Gear Bushings Too Tight in reply to Ramrod, 01-05-2005 20:33:23

Ramrod,

You should take it off the bushings. When it comes time to do the job again, if the bushings are slightly oversized, and the shafts are undersided (due to one take a few thousands off on the last job), then they may be too loose. In that case it would be a difficult fix. If you modify the bushings, then it will make no difference when they get replaced again.

Fessman

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