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Old 09-15-2013, 04:44 PM   #1 (permalink)
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How does CTIS work?

Wondering how central tire inflation works in a solid axle. This is the closest I've found, and for a portal it looks like a fairly simple setup.



How do they do it in a solid axle without external air lines?
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Old 09-15-2013, 05:50 PM   #2 (permalink)
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When I first read the title, I thought you were asking how CLITS work.................
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Old 09-15-2013, 06:10 PM   #3 (permalink)
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Generally CTIS doesn't work.

There's multiple ways to attempt to make it work for a solid axle. Normally it's just as simple as there being a couple extra seals between the hub/spindle, and that area is pressurized via a drilled passage in the spindle, and the hub is drilled/tapped to allow an air line to be attached to it at the pressurized area. Or something like that.
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Old 09-15-2013, 06:15 PM   #4 (permalink)
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If can remember I'll post up a schematic from the shop tomorrow. But the simpler set ups work just like you posted.
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Old 09-15-2013, 06:20 PM   #5 (permalink)
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If can remember I'll post up a schematic from the shop tomorrow. But the simpler set ups work just like you posted.
The schematic he posted is from the H1, or HUMVEE? It works that way, and can work that way, because the output gear in the portal box is supported from both ends and can be drilled for an air passage. You can't do that (easily) with an axle shaft that uses u-joints, as it flops around in there a bit too much Probably could make something like that work with CV joints if you wanted to, but I think it would be making an unreliable system even more unreliable.
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Old 09-15-2013, 06:33 PM   #6 (permalink)
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Sounds like a job for mogger. Oh wait
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Old 09-15-2013, 08:51 PM   #7 (permalink)
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Out of all the army junk I've driven, every rig was inop. Or rendered inop. Because of sealing issues. It seems like a good system in theory, but like most in life, real world conditions prevail

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Old 09-15-2013, 08:56 PM   #8 (permalink)
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Out of all the army junk I've driven, every rig was inop. Or rendered inop. Because of sealing issues. It seems like a good system in theory, but like most in life, real world conditions prevail
If it makes you feel any better, the systems on the MAN, Tatra, Kraz, etc, trucks are apparently fairly reliable.

It's just the N. American stuff that doesn't work
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Old 09-15-2013, 09:13 PM   #9 (permalink)
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We had a pretty reliable system. Us standing at each tire for a goddanged hour airin' them back up to 60 psi with a friggin' airchuck.
I guess that's why we never aired down for ops. Airing up super singles on a five ton is a bitch

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Old 09-15-2013, 09:24 PM   #10 (permalink)
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When I first read the title, I thought you were asking how CLITS work.................
That whole area is a medical mystery.
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Old 09-15-2013, 09:24 PM   #11 (permalink)
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Out of all the army junk I've driven, every rig was inop. Or rendered inop. Because of sealing issues. It seems like a good system in theory, but like most in life, real world conditions prevail
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If it makes you feel any better, the systems on the MAN, Tatra, Kraz, etc, trucks are apparently fairly reliable.

It's just the N. American stuff that doesn't work
Depends on the junk. The M939-series was junk CTIS. The same system was used on the early LMTVs.

The OSHKOSH system was pretty pimp. Eventually the axle seals would fail or the main diaphragm would let go, but that was after over a decade of military service. Once the system would be refurbed, it would work great for another 10 years or so.
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Old 09-16-2013, 04:01 PM   #12 (permalink)
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Btt :d
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Old 09-16-2013, 04:08 PM   #13 (permalink)
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the more or less ghetto way to get it done and not compromise axle strength.
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Old 09-16-2013, 04:11 PM   #14 (permalink)
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Btt :d

Trucks 2.5 Ton M1078 Maintenance Manuals

edit: pictures in the -24p

http://trucks25tonv1-2.tpub.com/TM-9...65-24P_390.htm
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Old 09-16-2013, 05:45 PM   #15 (permalink)
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the more or less ghetto way to get it done and not compromise axle strength.
I have seen busses done this way also.
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Old 09-16-2013, 05:57 PM   #16 (permalink)
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Guy down the street with an h1 has four flats atleast once a week
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