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Work Packages 130-133 in the -23-1 TM might be helpful. If you haven't already, I'd be using shop air through the emergency gladhand while troubleshooting this so you can hear everything that's going on.
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There are two air cylinders on the transfer case, the shifter lock cylinder and the front axle engagement cylinderI tried a few things yesterday. First was I started the truck ran it up to 59 then applied the parking brake,no change. Released it and applied a few times no change. So I crawled until the truck and ran the air lines down. There are 2 valves on the transfer case. Looked 1 up in the TM and couldn't find the second. The one I did find rang a bell in my head.I remembered that soon after I got the truck I flipped the front axle lock in and heard the same sound in the intake. So I think it might be the valve I found in the TM called the "Front axle Engagement control valve". THe second unidentified valve sits about 6" to the drivers side of the a fore mentioned valve and has 2 wires coming from it,1 grounded to the frame and one to a breaker.
Shift lock solenoid and shift lock cylinder.I made this reply already once today, but for whatever reason it didn't post. SO the news is worse than what thought, All 4 wires around the shifter and the brake lever are screwed. Can anyone tell me what thing in the picture with the green arrow on the right is?View attachment 619241View attachment 619242View attachment 619243
The unloader valve is built into the top of the compressor. It has a spring which keeps it in a position to send the air generated by the compressor to the air dryer. When the air governor senses 120psi it sends air through a small line to the unloader valve overcoming the spring and changing the unloader valve position which dumps the air the compressor makes. These valves are known to stick in the unload position causing no/low air building.So is the unloader the solenoid or the cylinder or something different?
The unloader is part of the compressor. I think Swede69 was commenting on your air issue.So is the unloader the solenoid or the cylinder or something different?
I had a similar problem except mine would not build past 40PSI and that much air was not coming out of my intake like yours. For me, I trouble shooted till I could not stand the truck anymore. I had just replaced the air dryer a few months before and also replaced the governor, plus capped the CTIS system off...also replumbed the lines for the new bigger Air horn I added.I was really excited to get out and drive bigboy for a few miles today since I finally fixed the air horn problem. Everything was great! Wrong!!!!! I started him up and what do ya know he won't build air past 59 psi. So I shut him down and heard air coming out of the intake stack.(video) This is a 84' M923 with the nhc250 engine. Any and all help is greatly appreciated. Have a good one.
https://www.youtube.com/watch?v=olLNmkIO-g4&feature=youtu.be
Actual page #199 in the -24P-1 TM. Item #15 in the diagram.I've searched the forums and repair parts TM for the 5th gear lock up solenoid and can't find it. Does it have another name? Or does anyone have a picture? Thanks for the help already and I know that I'm not taking the advice really well, But I do appreciate it.
Alright I decided to start with the small stuff and work my way up. SO I replaced the transfer lever switch and wires. Then I tried to start BigPOS and of course as soon as 59 psi is reached the horns start blowing. I unplugged the horn switch and horns kept blowing, Then I removed the switch from the parking brake and made sure nothing was grounding there and guess what! YEP THE DAG GONE HORNS ARE STILL BLOWING!!!!!!!, I'm getting pretty darn sick of having an extremely expensive 22,000lb paper weight![/QUOTE
Yeah? I think we've all been there at one time or another! I find it best to step away. Don't want to "break" anything else on paperweight or my body. Give it a day or two.... (easier typed than done!) Looks like you've gotten some help. It's just a matter of "finding" the right thing. I hope ya find the answer, either from another member here on S.S. or yourself. WHEN it's fixed, you'll look back and laugh. (not until then though) Good luck and God's speed!
It's either part of the joy of owing one, or it's the bane of owning one. Sorry for your luck! Don't know if you'd be better of with "another one" instead of this one? Some vehicles are rolling gremlin collectors! LOL Murphy always seems to have a seat somewhere for the long haul. Others? They've never heard of "murphy" and drive through a flood, tornado, and blizzard with just their rust and such holding them together. I truly wish you well! I pray that you find the cause, get it fixed, and are trouble free for the rest of your ownership!That's the problem plumber, every time i get it fixed i can drive it for maybe a month before something else catastrophic goes wrong and it sits for another 3-4 months!
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