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It is a load sensing brake proportioning valve. Adding weight over the rear axle increases brake air applied to match the increase in traction available…

Yea, unless they are really loaded heavy…

The AOP is OK, but it and the manifold have their fair share of issues. I find it hard to believe your hand pump is bad… I am removing that mid structure so dropping to a hand only was a good decision for me, and also keeps inline with my KISS policy. i have used that type hand pump on dump...

The control valve cores are segmented by orings. A bad seal could let pressure pass right from inlet to outlet and have trouble building enough pressure to do the work… capping the outlet on the hand pump will prove if the hand pump is indeed bad. You should not be able to pump into a...

The installed hand pump is really small volume and only pumps in one direction so a normal lift takes 168 full pump strokes anyway... You could also have a bad control valve or pump check valve and I gave you some suggestions to try and narrow down the problem over in the other discussion...

Well it is about 4X too big, which means it needs 4X the cable size and will pull 4X the current needed to actually do the job, while sending 3/4 of the fluid thru the safety relief valve. The 0.8 GPM is I believe a typo based on the KW rating and the port size, and farther down in the...

Does the hand pump not work? Pretty common for the AOP to need seals/work… hard engagement into drive may be high idle RPM. As mentioned check the pedal and cable, and insure the governor control is returning completely to the idle RPM stop screw… It is virtually impossible to fully warm up...

Well unless you are towing something heavy, the liquid cooler should be providing all the cooling you need, like it does for all the trucks that don’t have an aux cooler. Another thought is that someone pulled the core out of that thermal regulator, you know, engines overheating, lets remove...

It is the thing mounted to the plate, seen between the hoses he has his fingers on in this picture… Note the P6/rear transmission cover in the background… it is probably a diverter, and has a thermal element like the bypass thermostat in the engine. It sends flow one way(like back thru the...

Yep, you need a functional oil sw for evertthing to work as intended. the oil pressure switch controls oil light and via K11 the starter and alternator. Those Nason switches are not all that common, but a 1/8” NPT threaded, 15PSI N.C(normally closed) oil pressure sw can be had at any auto...

The same circuit that powers the oil light on the dash also controls K11. No dash oil light or K11, no start. There are 2 oil pressure sensors, in your pic, the large one on top of the small oil manifold drives the oil pressure gauge, the smaller one on the oil manifold pointing toward the...

Ok, so when you turn on the main switch, do you get a low oil pressure light on the dash? Do you also get relay K26(neutral) and K11(alt excite) relays energizing? You need these 3 things to enable the start circuit. The trans controller powers K26 when in neutral. K26 in turn provides...

I would start with an oil stiction additive. the heui injectors use electric spool valves with close tolerances. Engine Oil quality is important. The black smoke is probsbly the spools not closing cleanly and causing the injectors to dump extra fuel. Diesels like to be warm and loaded, so I...

Well that sounds like a couple of things have failed, or else a hack job is in play here. Plumbed properly there is a air operated control valve on the inboard end of the primary and secondary air tanks that feeds the air to the AOP control pushbutton valve at the hydraulic control panel. When...

Yes the codes are in the manuals, but a better resource is the allison MD3060/3070 troubleshooting guide. Google TS2470EN and you will find places to download it like this https://www.manualslib.com/manual/1354071/Allison-Md-3060.html

You need to read out the fault codes in the transmission. Press up and down arrows at tge same time. There are 5 memory positions D1-D5. It will flash D1 ?? ??(2 sets of numbers). Write the numbers down. Note if the mode light is lit. Press the mode button to step thru the 5 memory...

Yea, not a big fan of the MMDC. Too many eggs in one basket...

Well maybe your TPS has issues. It is a center tapped variable resistor, so with an ohm meter hooked to the wiper connection and either of the other 2 connections you should be able to see a smooth resistance change from idle to full pedal position. Any sudden changes in resistance the...

No. The trans controller uses the Throttle Position Sensor(TPS is on top of engine) to provide that information To help steer upshifts and downshifts. it is easy to re-calibrate it, but you want to insure that the pedal first can rotate the governor input(on top of governor) all the way...

Yea that was just that outer solenoid cover. It’s only purpose is to allow for a fitting to vent to the outside. You could remove it and the unit would vent the control air into the cab, the same as is pictured above. They did that on the A1R(at least on the 6X) as they used all the floor...