Dual screws single drive load transfer question.

Mr @Misesian knows a lot about this stuff. He may be able to help.

 

I think it's the "traction control". I drove a newer KW that had that, it was a PITA. A wheel would drop from the air ride, the sensor detected a wheel spin, and applies the brakes. Stuff like that would drive me nuts with a newer truck.

 

If your check ECAS light is on, the system may not be working. Freightliner uses MeritorWabco ECAS. One of my trucks is 2016 Freightliner 6x2. It’s supposed to engage in its own up to 40 mph. You can engage it by hitting the load transfer switch, and disengage by holding it down for 3 seconds.
When I spec’d my International, I did not request the load transfer system, my fault. But, what I did was order all the parts of that system that I needed to complete it, and added a manual switch on the dash to operate it, no electronics doing it. You already have all the parts. You could have the dealer go into your ABS ECU and turn the feature off completely, the truck will think it’s no longer there, and add a switch on your dash that uses a simple fan solenoid to turn it on and off. You would be dumping your rear axle only, using the existing high capacity valves. That’s what I’m driving every day and I have no problems with it.

 

An example. A couple weeks ago I was in Utica, NY and had to go Rochester and Syracuse. A storm blew through and dumped a lot of snow in only a couple hours. The roads weren’t perfect to begin with either. The way I took back to the interstate was a county road. It hadn’t been touched. All you could see was the poles telling you where the edge was. It has 4 grades on it that are short but steep. On the hills, I’d dump my tag and go right up without losing traction a bit. The pickup truck behind me, not so much, he kept spinning out going up the hills.
The only time I’ve been stuck with the 6x2 was when I parked one night and didn’t pay attention. I woke up in the morning and I had sunk about 10 inches into thick mud and couldn’t get out. I was bobtail, a small wrecker for cars came out and winched next out.

 

Yes. It could be the load transfer feature and components or another ABS fault not letting the system operate. ECAS is your ABS ECU from Meritor, of which the load transfer is a feature in the ECU.

 

Yes. You can engage it manually at any time, disengage bu holding it down three seconds.