CTIS - Blowing oil

[Camoguy]

When I turn on the CTIS it starts bypassing/purging air out this tube along with gear oil. I also believe the drive line may be locked/stuck on front axle. The truck wines loudly when up to speed. Any thoughts? I think I have addressed all my air leaks this seems to be my last ctis problem

 

[Elijah95]

What’s your fluid level in the front diff, and both front hubs?


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[Camoguy]

What’s your fluid level in the front diff, and both front hubs?


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Ill have to check in a few. You think its over full?

 

[Elijah95]

When my truck deflated air from the front, it blows out of that hose, and I’m thinking your hub seals may be shot


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[Elijah95]

Also, you can blow a little air out of your valve stem on LF and RF Tires to see if oil blows out of the valve, if it does it’s time to dig in


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[Camoguy]

When my truck deflated air from the front, it blows out of that hose, and I’m thinking your hub seals may be shot


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Diff is full.
I did get oil from valve stems on both sides.

 

[Camoguy]

When my truck deflated air from the front, it blows out of that hose, and I’m thinking your hub seals may be shot


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So is this a job that can be tackled without special tools?

 

[Elijah95]

Okay, sounds like CTIS hub seals are toast. I believe the job is straight forward, only struggle may be setting CTIS hub seals proper depth like the old m939a2 trucks


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[Camoguy]

Ugh not familiar with those either. Any way nothing to it but to do it. Anyone know the part numbers needed for the correct seals? I have been searching... I have not called oshkosh yet.

 

[Camoguy]

Update, I have called Oshkosh twice now with no luck. I used what I thought was the civilian contact line for parts and service based off another thread on this site. I get transferred as if I reached the correct department but there is No response to my messages. You guys know a better source for these hub seals?

 

[MrMikey4026]

I bought all my seals on Epay.
CTIS seals, Hub seals, axle shaft seals.
They were much cheaper than buying them from surplus vendors, same OEM parts.

 

[Camoguy]

Does anyone know how to get this ring gear off? Im trying to replace the CTIS seals.

 

[Camoguy]

Does anyone know how to get this ring gear off? Im trying to replace the CTIS seals.

Never mind. That snap ring appeared to be a solid circle the first 5 times I looked at it.

 

[737Driver]

Can I get an update on your hub rebuild??? Mine smells like gear oil inside the cab when it gets heated up on a long trip. Every time it spurts air for the CTiS system the cab gets a gear oil smell for a few minutes. I’ve been checking the oil levels in hubs never low. But I’ve changed a few tires and found gear oil in the tire and inside some of ctis valving! How was your hub rebuild? Did you find any thing messed up inside?

 

[DeMilitarized]

Ebay Does not have any info on any of the seals besides the outer spindle seal. Anyone have the PN for the ctis seals?

 

[aw113sgte]

I'm not super familiar with MTVR but I would check the axle vents. Mine were plugged on an FMTV and it caused the same ctis issue

 

[lighten]

Where is the CTIS suppose to dump air when it is deflating the tires? I have seen air come out the same hose as the #1 post picture by radiator, and also out of a large tube behind the cab by the trans fill tube were other vents are. Is this correct operation?

 

[DeMilitarized]

Where is the CTIS suppose to dump air when it is deflating the tires? I have seen air come out the same hose as the #1 post picture by radiator, and also out of a large tube behind the cab by the trans fill tube were other vents are. Is this correct operation?

There are some valves by the frame rail should be one per axle called the qr1 valve that all the air dumps through

 

[lighten]

There are some valves by the frame rail should be one per axle called the qr1 valve that all the air dumps through

So i have some hub seal problems? It only blows air out said tubes when deflating the tires. One would think it would do it when inflating also, i dont think it does inflating then. I have never had a hub apart so i may be wrong?

 

[DeMilitarized]

No they seal when you inflate. Pics are appreciated


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