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NAA Spider Gear - Different Thrust Washers

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Ramrod

04-13-2005 07:28:41

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In my effort to rebuild the Old Warrior's differential, I have found two different types of 'Differential Pinion Thrust Washers' (NCA-4230-A). I have seen steel and the more familiar bronze. These guys are impossible to find new, so I may be stuck with the used ones I have in hand. The steel are in very good shape, the bronze are ranging from worn to pretty bad, but usable. What would be the correct version to use?

Ramrod

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Ramrod

04-13-2005 19:48:01

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Re: NAA Spider Gear - Different Thrust Washers in reply to Ramrod, 04-13-2005 07:28:41

The problem I have with the steel washer is that it produces a steel on steel environment between a spinning spider gear and the differential housing. This will cause (in my mind) sufficient wear and tear to make my careful and complete rebuild moot in only a short while. I think that the older steel washers were originally plated in bronze and indicated their wear by exposing steel surfaces, which are totally exposed on the old used set I have. I keep thinking about the cam follower pin problems we have all seen and are so aware of in out hydraulic control units.

I'm gonna check out Hobo's suggested site and see if they can help.

Ramrod

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Hobo,NC

04-14-2005 05:22:08

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Re: NAA Spider Gear - Different Thrust Washers in reply to Ramrod, 04-13-2005 19:48:01

I'mm not a injunneer and never assked bout the steel washer kin tell ya they will work trouble free. I have never seen a bronze washer used their. The washer is used so the spider gear does not run in direct contact with the carrier. Their is alota fource applyed their. If no washer is used it will eat the carrier up fast.

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Hobo,NC

04-13-2005 17:36:27

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Re: NAA Spider Gear - Different Thrust Washers in reply to Ramrod, 04-13-2005 07:28:41

I would use the steel one over the bronze in a hartbeat.

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Hobo,NC

04-13-2005 17:23:40

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Re: NAA Spider Gear - Different Thrust Washers in reply to Ramrod, 04-13-2005 07:28:41

I feel that washer wuz a standard washer used in truck rears. If their are some old truck shops around some one may have saved some of'em. I keep all I kin git my hands on and have found they interchange out to utter models. I don't have one for yer tractor. you may send it to http://www.ring-pinion.com/ and they may be able to match it up

Link

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Bob

04-13-2005 09:15:02

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Re: NAA Spider Gear - Different Thrust Washers in reply to Ramrod, 04-13-2005 07:28:41

Modern cars and pickups just use steel thrust washers, and the potential for much greater speeds of the differential gear in reference to the case exist with a road vehicle than a tractor, and the steel thrusts hold up well there, except in cases of extreme abuse (spinning one wheel).

I'm willing to bet in a tractor the steel ones will hold up about forever.

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Dan

04-13-2005 08:34:38

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SUGGESTION in reply to Ramrod, 04-13-2005 07:28:41

If you have the washer out, you may be able to find a suitable replacement from a company in McKinney called Fastenal 972-547-9673. Maybe call and give them the dimensions and material. They have access to all kinds of unusual things.

Worth a try,
Dan

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Dan

04-13-2005 07:47:18

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Re: NAA Spider Gear - Different Thrust Washers in reply to Ramrod, 04-13-2005 07:28:41

I could be wrong, but I would think the bronze ones (being softer) would be needed to purposely wear. Have you tried the Barkleys yet? Don found me some new original muffler clamps and an original NAA 7V regulator. He is a real good source of hard to find parts.

Looks like we are working on the same area of our tractors for a change. I just got my axles back in, new oil seals, new brake pads, a few new brake retainer plate studs that broke or I had to drill out, and new hubs. I got the brake drums wire wheeled and painted last night, now I am working on wire wheeling the 6 loop rims and painting them. I want to do this prior to putting the new rubber on, that way I will only need to worry about touch ups. I have to split my differential to tranny housings AGAIN to get back in and fix a leak due to omitting the reverse idler shaft "O" ring. Thinking about taking my sheet metal to a professional paint shop, as I do not have the setup.

Good luck on the washers,
Dan

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Ramrod

04-13-2005 07:53:23

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Re: NAA Spider Gear - Different Thrust Washers in reply to Dan, 04-13-2005 07:47:18

I've about worn out my welcome with Don and Derrick bugging them about this differential, and they came through with everything except these stinkin' thrust washers. These things may be the first part that I can't come up with in this project, and that would be a bad thing. I am also thinking about pro paint for my sheetmetal. I wonder what it costs? Let me know what you find out, Reckon Maaco would do it for cheap?

Ramrod

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souNdguy

04-13-2005 11:30:04

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Re: NAA Spider Gear - Different Thrust Washers in reply to Ramrod, 04-13-2005 07:53:23

TSC has a decent assortment of thrust washers hanging in baggies. Probablt not the right size.. but perhaps something a machinist could mill / adjust??

As for painting.. keep in mind that for less than 200$ you can get an el-cheapo paint rig like I did.. and get superior results.. I used a 15 gallon air tank.. and a 2hp 4 gallon air compressor.. and a 14.99 gun, and 19.99 regulator from harbor freight. Made great results...

Soundguy

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Dan

04-13-2005 08:09:14

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Re: NAA Spider Gear - Different Thrust Washers in reply to Ramrod, 04-13-2005 07:53:23

I have a Maaco close to my house, but I think I am going to try to find a small Mom and Pop shop as there are several close to me as well - may give a little bit more attention to detail than the bigger shops, and maybe a break in price as well. I still need to sand blast and repair my sheet metal, and rear tires are my next big expense (I have to budget these things) so I am probably at least a month away from painting, but I will let you know what I find if you haven't done yours yet.

Later,
Dan

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