I have an M818 which is the tractor variant of your truck. The 6X6 is not full time. The front axle engages through an over running clutch (sprag) in the transfer case when there is more than a 10% slip in the rear axles. The sprag is controlled directionally through air poppet valve on the passenger side of the transmission. There is a declutching cylinder on the front of the transfer case that shifts the sprag from forward to reverse direction. When moving from N-5 to R or back you will hear an air pop under the cab tunnel. This is the poppet valve activating the declutching cylinder. Make sure you don't run the sprag opposite to the selected direction especially on the hardball. You can turn off this feature by adding in an air cut-out on the poppet air supply line. Removing air from the declutching cylinder sets it and the sprag to neutral. I've got my truck set up this way. I have also upgraded my truck to dual circuit air brakes with s-cams in the rears and wedges in the front.
@@ntdracing OEM brakes on these trucks are air assisted hydraulic. There is an “air pack” or air operated booster that pushes the fluid to the brakes. It is operated in conjunction with the master cylinder. Most likely your brake woes are in the air pack.
@@ntdracing It’s a beefy system as long as every component is working properly. My distaste of the system is it is a single hydraulic circuit with no safety redundancy. Do you have a set of technical manuals for your truck?
M817…..awesome! Had one for about 8 years….amazing machine! Looks like your’re on 16R20’s ? Hauled about 60 loads of gravel (10 tons)…..never a problem. I did switch the brakes over to Dot 5….added a visible reservoir to make sure brake fluid was topped off. Great post!
You feel like a different man driving vehicles like this. A general contractor friend had something similar, M125, they used it for land clearing. Theirs could pull large trees, roots and all right out of the ground and it would run on anything you put in the tank. Diesel, gas, used fry oil. I'd call it the Beast.
1:36 and I’m gonna have to stop you there. “Why on earth did you buy something like this”. If she has to ask, I don’t even know how to respond to that. This thing is awesome. But to have to explain how something obviously this awesome is awesome. Maaaan I dunno what to do with that lol.
I have an M818 which is the tractor variant of your truck. The 6X6 is not full time. The front axle engages through an over running clutch (sprag) in the transfer case when there is more than a 10% slip in the rear axles. The sprag is controlled directionally through air poppet valve on the passenger side of the transmission. There is a declutching cylinder on the front of the transfer case that shifts the sprag from forward to reverse direction. When moving from N-5 to R or back you will hear an air pop under the cab tunnel. This is the poppet valve activating the declutching cylinder. Make sure you don't run the sprag opposite to the selected direction especially on the hardball. You can turn off this feature by adding in an air cut-out on the poppet air supply line. Removing air from the declutching cylinder sets it and the sprag to neutral. I've got my truck set up this way.
I have also upgraded my truck to dual circuit air brakes with s-cams in the rears and wedges in the front.
@@2A3A66 this is info we need…seems like our brakes are no longer working. We build air pressure, but it does not make it to the brakes.
@@ntdracing
OEM brakes on these trucks are air assisted hydraulic. There is an “air pack” or air operated booster that pushes the fluid to the brakes.
It is operated in conjunction with the master cylinder. Most likely your brake woes are in the air pack.
@@ntdracing
It’s a beefy system as long as every component is working properly. My distaste of the system is it is a single hydraulic circuit with no safety redundancy.
Do you have a set of technical manuals for your truck?
@@2A3A66 I do not. Do you know if they are in PDF? Thanks for the info.
@
I have all of them in .pdf.
I can send you a set.
I seriously question your choice of project vehicles but at least you have good taste in beer. Coors is the only one I drink. 🥳
I can't wait to see it!!
M817…..awesome! Had one for about 8 years….amazing machine! Looks like your’re on 16R20’s ? Hauled about 60 loads of gravel (10 tons)…..never a problem. I did switch the brakes over to Dot 5….added a visible reservoir to make sure brake fluid was topped off. Great post!
The Brake upgrade sounds like a good idea. Will look into it. Thanks
I pulled a generator with one in the early 90s.
Idk if the Army still uses them but it was a beast.
Have fun...
Badass!!
I remember when you could get deuce and a half’s from the auction, running and driving, for under $1k
Love the wife comment and acknowledgement, I've found myself there on occasion. LOL
I told her "Honey...I bought something. You are going to hate it, but all my friends are going to love it."
You feel like a different man driving vehicles like this. A general contractor friend had something similar, M125, they used it for land clearing. Theirs could pull large trees, roots and all right out of the ground and it would run on anything you put in the tank. Diesel, gas, used fry oil. I'd call it the Beast.
I am looking for a tree that needs to be pulled.
jolly green giant
Why?
BECAUSE!
1:36 and I’m gonna have to stop you there. “Why on earth did you buy something like this”. If she has to ask, I don’t even know how to respond to that. This thing is awesome. But to have to explain how something obviously this awesome is awesome. Maaaan I dunno what to do with that lol.
Bob it and make it a 4 wheeler
No man should be asked why he needs something.
@@justinontman I keep telling my wife that….
@@ntdracing me to.... it just doesn't do any good. Lol
@@justinontman 😂