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I could not see to well in your pics. There is a washer that goes over the inter axle seal, sometime it is copper looking. That is what the back side of the axle flange rides on.
Sounds like you still have an air leak some place, I would check the fuel filter and the pickup tube in the tank.
Check out this tread. Also the oring on the bolt at the top of the fuel filter can be a problem.
http://www.steelsoldiers.com/showthread.php?79327-M923A1-losing-prime
The 5/8" and 3/4" is the bolts on the wheels not the lug nut studs. If you look at the Lug nuts they are like 1".
Also the hub in the pic is not a M809 or M939 series hub.
I just repaired my M932A2 Ctis on one wheel. As it turned out one air seal had moved in the hub and was not hold air anymore.
But when I took the hub apart I found that there was not a seal like the A0 & A1's outer oil seal, only the two air seal and the inter seal. So I guess the outer...
The tread size is 3/8" x16 I think my PTO has all studs and no bolts. Not sure the best way to fix your case.
The studs are 3/8" x16 and the nut end is 3/8" x 24 and OAL 2"
If the valves are off, I would take the hoses off and flush the heater out so the water does not go into the motor.
When I got one of my trucks the heater valves were off, when I opened them I found a leak in the heater core and all kind of crap came out of it.
I get my o-ring from a place here in Phoenix and they are around $5ea.
On the 5 ton wheels you need to know if they have 5/8" bolt or 3/4" wheel bolts. The 5/8" wheels take a 3/8" o-ring and the 3/4" wheels take a 1/4" o-ring.
I have one if you need one or if need many I can get them for you.