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Front axle vent lines clogged

Keith Knight

Well-known member
Steel Soldiers Supporter
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1,905
113
Location
Wauchula, FL
Filling my new eco hubs with gear oil I noticed it was pressurizing. Lead me to check for proper ventilation. While trying to find where it vents to is a lot more complicated than it should be. After figuring it all out I figured I should share this information for everyone. IMG_3747.jpeg
A quick drawing explaining how it’s plumbed. Stewart and Stevenson made some bad choices on this if you ask me. I can understand using a large hose for coming off the hubs but then the drivers side is choked down to a 1/4” line, makes no sense. IMG_3741.jpeg
Here is the culprit on the top of the axle closest to the passenger side. IMG_3744.jpeg
The disconnected hose is where the clog was it goes up behind the cab to the vent. IMG_3742.jpeg
This is the vent. IMG_3743.jpeg
A 1/4” drill bit cleared the clogged area.

IMG_3745.jpeg
The largest coming from the front hubs is the vent line and the goes to the frame. IMG_3746.jpeg
I’m guessing this is what caused my front axle seals to fail. Or maybe they didn’t fail completely and the case was pressurizing forcing oil out. Either way I’ll sleep better knowing I have all new seals and I’ve cleared the clogged vent.
Hope this helps understanding the mystery of how the front axle and hubs are vented.
 

aw113sgte

Well-known member
Steel Soldiers Supporter
692
1,058
93
Location
La Crosse, WI
My rear axle was leaking (out oil drain plug and shooting oil out the CTIS QRV) turned out the vent was completely clogged.
 
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