M105 axle spindle size

Csm Davis · Mar 11, 2016

Does anyone know the exact sizes of the spindle on the M105?

Wildchild467 · Mar 11, 2016

You mean the spindle nut socket size?

Valence · Mar 11, 2016

Wildchild467 said:
You mean the spindle nut socket size?

Even if that's not what he means, I would appreciate an answer to this question!

gringeltaube · Mar 11, 2016

M105 & M105A1 are the same size and diameters (same bearings) as the Deuce axles: Ø 66.675" inner, Ø 61.912" on the outer end.
M105A2 & A2C have Ø 66.675" on both ends, inner and outer side. (I'm almost certain that the bearing numbers are 39590/39520)

G.

Csm Davis · Mar 11, 2016

Wildchild467 said:
You mean the spindle nut socket size?

No the actual spindle.

Csm Davis · Mar 11, 2016

gringeltaube said:
M105 & M105A1 are the same size and diameters (same bearings) as the Deuce axles: Ø 66.675" inner, Ø 61.912" on the outer end.
M105A2 & A2C have Ø 66.675" on both ends, inner and outer side. (I'm almost certain that the bearing numbers are 39590/39520)

G.

Is that metric measurements or what bud?

Csm Davis · Mar 11, 2016

So 2.625" and 2.4375" in imperial units?

gringeltaube · Mar 11, 2016

Oops, sorry about that... should have typed mm, not ".

Yes, divided by 25.4 gives your numbers.

Valence · Jun 5, 2016

Wildchild467 said:
You mean the spindle nut socket size?

So to bump this thread, the M105A2 TM (TM 9-2330-213-14&P), page 4-81 (PDF document page number 137) section 4-49 "HUB, WHEEL, BEARING, AND BRAKEDRUM MAINTENANCE", lists:

Socket, wheel bearing, 3-3/8" (the next figure appears that it'll need to be an 8-sided socket) (I find it surprising that it's not the same as the deuce 3" bearing nut socket)

I've never taken apart my M105 hubs to repack the bearings, inspect/adjust the brakes, and replace seals and that's something I want to do this summer. So I was hoping to find the following answers:

Part number/source for hub flange gasket? (item #4 in the exploded diagram)
Part number/source for inner bearing seal? (item #20 in the exploded diagram)
What about rebuilding/replacing the master cylinder on the trailer?

I've done all of this on my deuce, but never found info on the M105!

Edit:
Found this about some master cylinder rebuild parts, but I've only rebuilt a deuce airpack (not a master cylinder, so step-by-step instructions are nice for someone like me... or just whole replacement parts)
http://www.steelsoldiers.com/showthread.php?119379-Master-Cylinder-Rebuild-Kit-M105-M1061-Bought-locally

Valence · Jun 6, 2016

After searching and searching online, I found Oshkosh claims to have the inner seal that fits (Item #20 from the previous exploded diagram).

http://www.oshkoshequipment.com/products/detail/165/5041/Wheel-Hub-Axle-Seal
$24.63 each

Military Part Number: 7411429
Military Description: SEAL,PLAIN ENCASED
National Stock Number (NSN): 5330-00-741-1429, 5330007411429
Federal Supply Class (FSC): 5330 (Packing and Gasket Materials)
National Item Identification Number (NIIN): 007411429
Federal Stock Number (FSN): 5330-741-1429, 53307411429
Alternate Numbers: 2275398
CAGE numbers: 19207,58499

This item fits the following series and models of equipment:

M103

M103A3 , M105A2 , M105A2C , M107A2 , M107A2C , M448

M149

M149 , M149A1 , M149A2

M295A1

M295A1 , M313 , M447 , M447C , M749 , M750

M991

XM991 , XM991E1 , XM991E2 , XM995 , XM995E1 , XM995E2

Valence · Jun 6, 2016

And just to help make this more complete for future searchers.

Wheel Bearing and Cone Set:

$30
NSN: 3110-00-198-1757
http://www.eriksmilitarysurplus.com/whbeform1m1m.html

$28.71
http://www.oshkoshequipment.com/pro...iler-Wheel-Bearing-Kit-for-M103-M105-and-M107

Military Part Number: MS19081-230
Military Description: CONE AND ROLLERS
National Stock Number (NSN): 3110-01-298-9358, 3110012989358
Federal Supply Class (FSC): 3110 (Bearings, Antifriction Unmounted)
National Item Identification Number (NIIN): 012989358
Federal Stock Number (FSN): 3110-298-9358, 31102989358

This item fits the following series and models of equipment:

M103

M103A3 , M105A2 , M105A2C , M107A2C , M448

NOTE:
I want to comment that the exploded diagram in this post is from Oskhosh's website. It shows wheel bearing nuts as only 6-sided versus the diagram I pulled earlier from the TM posted here on SteelSoldiers which showed an 8-sided wheel bearing nut. Update: gringeltaube answered this below, it is 8-sided.

gringeltaube · Jun 6, 2016

Thanks for the good info.

Just to confirm what I said in post #4: for the M105A2 and A2C models the inner and outer cone is #39590; inner and outer cup is #39520
(NSN 3110-00-198-1757 refers to one complete cone/cup bearing set)

Valence said:
.... (Socket, wheel bearing, 3-3/8" (the next figure appears that it'll need to be an 8-sided socket) (I find it surprising that it's not the same as the deuce 3" bearing nut socket) ............

Not so surprising really, if you think that the outer end of the Deuce spindle is Ø61.91mm, vs. Ø66.68mm for the trailer spindle.

G.

Valence · Jun 6, 2016

gringeltaube said:
Thanks for the good info.

Just to confirm what I said in post #4: for the M105A2 and A2C models the inner and outer cone is #39590; inner and outer cup is #39520
(NSN 3110-00-198-1757 refers to one complete cone/cup bearing set)

Not so surprising really, if you think that the outer end of the Deuce spindle is Ø61.91mm, vs. Ø66.68mm for the trailer spindle.

G.

Awesome, thanks Mr. gringeltaube!

I do find it interesting that the NSN for the cup & cone sets you used here was the same NSN as used on Erik's Military Surplus (3110-00-198-1757) , but is different than the NSN Oshkosh lists (3110-01-298-935

. However, both use the same Military Part Number (MS19081-230).

gringeltaube · Jun 6, 2016

Valence said:
Does anyone know if the M105A2 wheel bearing nuts are 6 or 8-sided?

8-sided, 3-3/8".

G.

Valence · Jun 6, 2016

gringeltaube said:
8-sided, 3-3/8".

G.

I sure hope you didn't just pull that cap for me to answer that. I was going to open mine (since I need to anyway), but I do appreciate it most definitely though.

Now if we can dig up sources for that tabbed bearing nut lock washer and hub flange gaskets

SCSG-G4 · Jun 6, 2016

Hub flange gasket - use RTV, it's only held on by three screws. No load bearing capabilities, no oil in pumpkin to contend with, so no cork needed.

Valence · Jun 28, 2016

Valence said:
After searching and searching online, I found Oshkosh claims to have the inner seal that fits (Item #20 from the previous exploded diagram).

http://www.oshkoshequipment.com/products/detail/165/5041/Wheel-Hub-Axle-Seal
$24.63 each

Military Part Number: 7411429
Military Description: SEAL,PLAIN ENCASED
National Stock Number (NSN): 5330-00-741-1429, 5330007411429
Federal Supply Class (FSC): 5330 (Packing and Gasket Materials)
National Item Identification Number (NIIN): 007411429
Federal Stock Number (FSN): 5330-741-1429, 53307411429
Alternate Numbers: 2275398
CAGE numbers: 19207,58499

This item fits the following series and models of equipment:

M103

M103A3 , M105A2 , M105A2C , M107A2 , M107A2C , M448

M149

M149 , M149A1 , M149A2

M295A1

M295A1 , M313 , M447 , M447C , M749 , M750

M991

XM991 , XM991E1 , XM991E2 , XM995 , XM995E1 , XM995E2

View attachment 626901 View attachment 626902

Here's something interesting, I looked up the NSN of this seal on PartTarget.com and it lists the following:

Accommodated Shaft Maximum Rated Speed: 3600 feet per minute

That's a maximum speed of 3600/5280 = 0.6818 miles per minute, or about 0.6818 * 60 = 41 miles per hour (or ~65.84 kph). So..... don't tow the trailer above convoy speed? That seems a little low.

gringeltaube · Jun 28, 2016

The "shaft diameter" - or sleeve in our case, where the seal rides on - is said to be 3.25 inches (to be confirmed), so the circumference there is 0.85 ft.
That means that the hub (with its seal in place) is allowed to spin up to 4,235 rpm. Which is equivalent to towing that trailer at "only" a little over 500 mph... :razz:

G.

Valence · Jun 28, 2016

gringeltaube said:
The "shaft diameter" - or sleeve in our case, where the seal rides on - is said to be 3.25 inches (to be confirmed), so the circumference there is 0.85 ft.
That means that the hub (with its seal in place) is allowed to spin up to 4,235 rpm. Which is equivalent to towing that trailer at "only" a little over 500 mph...

G.

That's much better math! So what you're saying is, the seal is fine until you push the trailer out from orbit?

gringeltaube · Jun 28, 2016

Well, I didn't say that fast... :smile:

BTW, a Multifuel crankshaft @ 2800 rpm has a similar linear (tangential) speed, where the seal goes!

M105 axle spindle size

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