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Take offs were not in the best shape?
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This is as close a thread that I can find on my problem which is actually opposite of this problem. I pump the brakes up and sometimes they are fine, but over time the brake pressure seems to build and build until the brakes pretty much lock up... I bleed a brake and it is fine again for a while but it will inevitably build up again... I have completely flushed the system and replaced with new silicone, I have replaced the master cylinder and air pack (with take offs) and it persists... I'm clueless.... Is there some kind of check valve some where in the system? I can't seem to find any literature reflecting this in the TMs... Perhaps I'm just blind and missing it somewhere.....?
Where is this inlet line??I prefer to lube mine on the inlet of the air going in.
A little oil goes a LOOONNNGGGG WWWWAAAYYY so
use it sparingly.
Better to lube it a couple of times a year than to flood the air pack with too much.
I have revuilt air packs where I poured the oil out as there was too much inside.
One, maybe two squirts of a pump oil can is enough.
Hope this is helpful.
RL
I took some photos of the air pack in my Deuce for reference.If you follow the route of each air line from the driver's side of the airpack, at the middle, you will find the following.
One goes from the aircontrol valve at nearly the middle of the airpack to the back of the airpack and connects there. This is called the J Tube. If you can find this, all the rest of the airlines connect on the same casting and area.
One will come off the front of the same air control valve in the air pack and head up towards the front of the truck, possibly tying into the vent for the master cylinder. This is the air pack exhaust.
One will come off and head towards the back, but go all the way to the glad hand air connection on the driver's rear of the truck. This is the Service brake air line. You would use this to connect to a trailer if you are towing one.
Lastly, there is an airline that runs off the side of the airpack and goes directly to the air tanks that set up in the frame behind the airpack and this is the line you want to pull off at the air pack (the tank end is almost impossible to reach with the cargo body on) and shoot some oil in there. By injecting oil here, you lubricate the entire airpack. As I mentioned previously, use a very small amount of oil. About as much as you would use to lubricate an airtool. Shoot the oil into the air line and allow the flow of air to pull the lubricant through the air pack as oppoised to shooting it directly into the airpack.
To make it somewhat easier to access the side of the airpack where these lines connect, remove the mounting bolts and skid plate on the bottom and the air pack will swing far enough away from the frame while hanging on the rear bracket to allow you to access the airlines.
Note, the airlines are roughly half inch in diameter, and the brake lines are half that size. All the hydraulic lines connect either to the passenger side, or the end of the airpack towards the front. These lines need not be touched in this process.
I hope this makes this less confusing.
There is a pretty good diagram in the mid level TMs that discuss removing and replacing the airpack and although you are not actually doing this, seeing how things connect in a drawing would most likely be of great help.
I hope this is helpful.
RL
I was actually hoping for someone to confirm that I interpreted rlwm211's written description correctly. I *think* I have it right, but would like to check.Thanks for the photos and line indentification. That helps alot.
I plan to remove the tool box as it also gives me the chance to more easily deal with some rust inside the tool box. Does the TB come out without removing the fender or anything else?I still say remove tool box is easer. The TM's did say three good squrts but I don't know how big there squrt is. Don't forget you are trying to get the felt to absorb some of that oil so it lubes the wall of the air pack. A little to much will do nothing to hurt.
I was going to oil my airpack today during lunch and was comparing your of the lines with mine, and where they match up to. Mine is a short style airpack and B in your pic goes to the air tanks on my truck. Ran out of time later I'll track down the rest. But has anyone else seen this?I took some photos of the air pack in my Deuce for reference.
If I am not mistaken, this is an old style air pack:
View attachment 278625
To confirm the your description of the air line connections:
View attachment 278624
where:
'A' is the J tube.
'B' is the line to the glad hand at the rear.
'C' is the line to the front (vent/exhaust).
'D' is the line to the air tank that you open to introduce some air tool oil.
'E' is a switch - to what? One connector is not original, and the wire is clipped.