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2520-01-554-9359

Transmission control unit - these don't like voltage problems. Was your voltage actually high? My truck would go into over-voltage cut-off and on two or three occasions I got an over-voltage warning from my TCU as well. It's the first thing to complain. They are also one of the more problematic...

Seeing as that post was nearly 10 years ago and that member hasn't signed in for 1.5 years I find it unlikely you will get a response. Also these parts are much more available now. For example: https://www.lmtvtrucks.com/AC/index.html

So here is what Allison DOC says in the help files and what options it gives. It looks like you want the "Low Preselects" to shift the RPM down by 150 RPM. Not exactly sure because I haven't tried it and the software selection isn't well coordinated with the help files in terms of...

Ah yes - I missed the smell of ozone and burning insulation! Such an obvious example. Some of the "enthusiast" vehicles I have occasion to work on often have an "interesting" take on wire management, routing, and shall we say..... "best practices and standards" o_O

Some versions of CAT ET will give that complaint but still make the change anyway. Try changing it, acknowledge the error, and then switch away from the settings page and back again. I've run into that a time or two. You switch off the page and back again and the setting was programmed in spite...

Well - I can definitely smell brakes being worked hard or dragging, clutches being slipped, belts dragging over seized pulleys, and often coolant and oil leaks as well. Sometimes before I can see evidence on the ground. Hot grease and fluids being flung onto the exhaust from driveshafts makes a...

I meant how the engine manufacturer (CAT) intended for the cruise control / exhaust brake to function based on the programming options. Obviously the truck manufacturer never intended any of these systems to integrate. The cruise control is nice for longer jaunts where you can get out on the...

Not argueing with the CC integration. I setup the CAT ECM to integrate the cruise and exhaust brake when I enable cruise control as well. That works as designed and as programmed by CAT. I have no issue with that. I get what you are complaining about - higher speed when the cruise control...

I don't think you'll get any significant braking effect in 5th or 6th gear unless you are going REALLY fast. And globally limiting it to 5th will mean you don't get any braking effect at medium speeds where it was only in 5th starting downhill. I was at the grocery store last night and on the...

Probably would get more visibility that way. The oil pump discussion applies to all trucks - even more so to the factory hub reduction trucks being they will wear out the flawed pump designs faster.

I would just get it from CAT. Unfortunately there's no way to know which design the third party companies decided to copy and things like the pressure relief valve and spring must be absolutely precisely made. I've seen aftermarket oil pumps for other engines that had sticky pressure relief...

Yeah your pump is trashed. Check out this video on a 3126b pusher RV with 92,000 miles - and remember mileage is irrelevant because our engine's spin 1000 rpm faster at highway speeds (without ECO hubs) than this RV so wear rates on parts that have known design flaws are accelerated:

@Lostchain reports ~40 psi at hot idle. My truck is ~22 psi at hot idle. Before the oil pump change his pressure was below 20 psi - sometimes would not read on the gauge if it was very hot and he would get an oil pressure warning. His old pump looked pretty good just on a visual inspection -...

Interesting - that pinout is not documented in the Dana troubleshooting guide. Looks like as you surmise - pulling the G pin will just re-route the ground for the PCU solenoids to the shield ground - which should be bonded to the CTIS chassis ground internally. In the FMTV harness the PCU 'A'...

It is true that the older CTIS control boxes don't coms with J1939. The newer FMTV ones do, but the older green box units and even the older black box units do not and since the 900 series trucks are older also I would not expect that they are capable of operating on J1939 anyway - so it may be...

The thread has 26 pages of ECO hub information at this point. If it drifts a bit it's pretty much irrelevant as the original discussion has already covered most aspects of note. The oil pump has/had multiple design revisions and defects. The pump rotor (gear vs. gerotor), and the idler gear...

That's just it though - the engine isn't "running" at or near it's redline in decel. It's being spun by the transmission and is not under power - no combustion pressure is taking place. That's not the same kind of load as operating under WOT, 370 HP @ 30 lbs of boost pressure. And over the road...

Sounds like you guys are worried about hurting the engine from over-revving. Empirical evidence suggests this isn't a failure mode we need to be worried about. Have never heard of this happening. Fuel consumption isn't an issue when in decel. And so we're down to nervousness over engine speed...

I haven't had an issue and there's plenty of hills around me. If you lightly depress the accelerator the exhaust brake will turn off and you will coast without downshifting. IDK I find it to be really pretty dang good overall and WAY LESS aggressive than it was before the ECO hubs. Compared to...