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It's on sheet 20 of the A1/A1R schematic in the PDF. P250 is for one of the two the J1939 databus termination resistors. If you want the simplified diagrams for each subsystem you have to dig into the electronic manuals. And sometimes they make you work for it. They are an acquired skill to...

Yup. The one's on my 2008 were in terrible shape.

U-joints are needle bearings. I don't know about moly grease damaging the bearings. I wouldn't consider using it for that application (it's a specialty grease - not a generic bearing grease) and I haven't done enough research or tried it personally to know. In the automotive world it's used in...

Those trucks are reportedly FMTV contract demonstration trucks. Basically prototype trucks from a manufacturer (I didn't read which one) that was not ultimately awarded the manufacturing contract. Note this is an older model with Michelin tires and door mounted markers. Likely a truck that was...

Moly is for extreme pressure - metal to metal sliding contact type of applications and might not be the best choice for u-joints. U-joints are not a sliding contact type of application like a constant velocity joint. If it flings it out of the u-joints then it's probably too thin also. I would...

The A1 trucks also have the exhaust brake. I don't think pad life was the concern. The military would rather have stopping power - they have enough problems with accidents to worry about brake pad life.

I use Amsoil waterproof grease. The Army uses GAA (Grease, Automotive and Artillery). It's really more important that things are greased frequently and less important what brand you use. The waterproof Amsoil stays in place really well in my experience - resists washing out if you do any amount...

I would highly recommend replacing them all. I can't tell from the TM which line is which, but the two lines to the tank - one is 72" and one is 123" according to the NIIN characteristics. Are you wanting the forward most line or the rearward most line? The forward line is 123" and the...

I didn't really notice that.... not sure by what mechanism that would be the case. You sure you're not just getting used to how much effort it takes? I know that I certainly did over the last several years. At any rate the A0/A1 pedal valve assembly takes a fraction of the pedal effort. You...

I can only subjectively tell you it's an absolute game changing difference. I can add that I own a performance shop with a chassis dyno so I'm not unfamiliar with exceptionally good brakes. The Saturday dyno rental today was an Infinity Q50 that made 715 rear wheel HP. Trust me you want this.

Yeah - one of these days I should make a complete post on that. I've posted it in other threads, but not made a post about the process. I should have taken more pics but I was pretty flustered about the compressor failure and just wanted to get my new toy back together (compressor blew up during...

It's certainly worth a look under there with it running since it costs nothing. I would also be very curious to look at the scope traces of the IACV. And to inspect the inside of the HEUI oil supply hose - being that hose is 23 years old - if those have a propensity to shed inner lining that...

Don't believe there are any lines except the single line from the pump to the head. All the injectors are fed oil through drilled passages in the cylinder head I'm pretty sure. I didn't notice any lines when I changed my injector wiring harness anyway......

This guy mentions that the factory feed line going into the HEUI pump was found to shed rubber internally into the pump:

We can put an oscilloscope on the control wires to the IACV and compare to the percentage listed in CAT ET and see if the signal is stable or dropping out, etc. That would be very straightforward with my PICO Scope. Same for the pressure sensor. Conceptually it's possible for the ECM driver to...

Keep the manual disconnect - it's very convenient for working on the truck. And keep the NATO slave receptacle. And for that matter keep the front glad hands. Everyone likes to delete this stuff but it makes jump starting and recovery a PITA for the rest of our community. It's pretty often that...

The supply filter comes with the HEUI pump and injector kit for the C7. Indeed I had to scour the Internet just to find the part numbers to install the filter kit on my C7 because CAT doesn't sell a "kit" for just the filter if you want to install it preventatively - probably because...

As to the filter - it's a filter for the HEUI pump oil *supply* and the official CAT setup is only for the C7. They did not create one that I'm aware of for the 3126. There is an aftermarket supplier that makes a filter that goes between the pump and the injectors which prevents a HEUI pump...

Well damn. Adept Ape mentions them jumping around like that and says that means the HEUI pump is going. You could send out an oil analysis sample and try to read those tea leaves. I wouldn't screw around at this point. I would get a HEUI pump and injector kit from CAT. As much as that...

Just an update on this. I've got about 400 miles on the new/old WABCO pedal valve (rebuilt it prior to install) and it works GREAT. Honestly it has totally changed the confidence level I have in the brakes. They went from kinda scary at high speed (can do 80+ MPH with the ECO Hubs), to VERY...