Search results

Ok after checking today i see no signal change of state when selecting or de-selecting mode so I am going to have to look into this further. What I do see is 7.4Khz pulsed at a 29% duty cycle whenever the ignition is turned on. Allison uses a 2 stage peak and hold Pulse Width Modulation...

Unfortunately i cannot tell you for certain, as i removed my manifold and AOP for a larger volume hand pump years ago, before I ever played with it much. There are half a dozzen checks, depending on which valve type you have. All 3 plugs on the rearward face of the manifold are checks. One...

I think you are on the exact right track. The return path forks. One leg goes back to the hand pump reservoir. The other feeds the AOP reservoir. The AOP leg has two checks in parallel, one pointing/flowing each way. The one flowing toward the AOP has a 5PSI cracking pressure, so it should...

Oh yea its a struggle… but when things get hard, that is usually where the weak links are exposed…

They should have been… what was the state of charge,? how old are they? Did they drop equally in voltage while cranking?

OK A1 The neutral relay K26 provides power to the alt excite relay k11. the oil pressure switch provides a path to ground to energize k11 and the oil idiot light below 15PSI oil pressure. So when you turn on the ignition switch the trans should power up, both those relays and the oil idiot...

The Neihoff is a well made alt, the problem is if I loose one out on the road somewhere, repair is basically unobtanium. Or it is very expensive if I can find someone to send me one. Something like a delco or leece is way more common, replacements and parts are readily available and a fraction...

You know I have looked at that diagram in appendix B of the troubleshooting manual about a hundred times over the years and never managed to pull that 7/16-20 note out of it:) thats exactly what I needed, thanks… 1/4” or -4 ORB, same as what is on our hydraulic cylinders. Have plenty of...

There is no debris in the case or strainer, drained it this summer confirming speed sensor source and tooth count. Dont think they are a failsafe config, i guess I will be finding out. I did notice the controller output for the diff-lock light(wire 125), that we use to control the power...

Dont have them on yet. It has had to wait untill i could get my cab suspension fabricated. The C7 pressure isnt monitored, which is why I will need to hook up a pressure gauge. The solenoid electrical circuit is Monitored, Which is how I know it has a good circuit, because it sets a 45-23...

Did you ever resolve this? Was backing up in the snow into my garage today and discovered I only had the 70/30AWD split in mode… the TCU is monitoring a good circuit thru the solenoid(threw a code when I disconnected it), so either the TCU isnt sending the signal, or the valve is not opening...

When the governor unloads at its set pressure, it sends system pressure to the small port on the bottom of the dryer. That applied pressure opens the purge valve on the bottom of the dryer To exhaust the collected moisture. There is a check valve in the top outlet port to the wet tank To keep...

I have a pair of 3-1/2’ pipes cut for tire work. 1” with .125” wall thickness. These fit thru the holes in the rim and right over the solid studs. You walk the tire in as close as you can, roll the hub to align the hollow CTIS stud and slip the pipes thru 2 holes near the top and over 2 studs...

You need a certain number of posts in this forum before you can initiate direct messaging. Cuts down on spammers who creat accounts immediately having access to the entire member list…

With the grill off, thats easy then, peek up in front of the top of the radiator. There is a pass-thru located there. The pedal and the park valve vents are tied together behind the heater and vent thru that port When you let off of the pedal or set the park brakes. If for instance the pedal...

Probably they simply had the parts laying around:)

Look for air leaking away out the vent up in front of the radiator. That would indicate the treadle valve or park valve is leaking Draining away the system air…

Well having the eco hub calculations fresh in my head, What is the total ratio in one of these manual+transfer combinations? 12:1? That probably would not work all that well. You are probably only going to get ~200# of idle torque out of a 6-7L diesel, and the clutch won’t be happy trying to...

You adjust the governor on top of the compressor, but you need to connect a gauge to the wet tank to adjust this accurately to 125. Procedure is in the manuals... The CTIS switch closes at 117, so the pressure may not be getting high enough to close the switch...

Have you reached 125PSI in the wet tank(brake service tanks)? CTIS will do nothing until it see enough pressure in the wet tank to close the pressure switch at the wet tank.