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MMO: Marvel Mystery Oil

I put a capfull of MMO into the inlet to the drag link as indicated. I then reconnected the air line and worked the wheel in both directions about a dozen times and then repeated oil application for a total of 3 times. This freed the drag link - mine was leaking 'on' all the time. The oil...

Not sure why they regulated down the truck service air to run the air assist steering. The difference between stock and bypass will certainly have an effect on the amount of force generated as well as the rate at which the assist will respond. All I can figure is that there was a desire to...

If you remove the cylindrical cover that screws on over the bottom, it exposes the adjustment knob. It is a standard regulator and you screw in the knob for more pressure and screw it out for less, assuming that the reg is working. These regs are very often leaking and inoperative. It...

Fed DOT rules on air brakes (including air assisted brakes) is that cut-in must be at 90 or more and cut-out at 125. System must be protected with relief valve at 150psi. Also requires supply gauge and audible alarm, which triggers at 60 psi. Must build to 100 psi from 85 psi within 45...

I bought my replacement on flea- bay for $25. It's the norgren and it was the exact replacement, even down to the billet aluminum screw on cover. They are on sale all the time. To the poster that has the truck air set to 105 psi, I hope you never get pulled over for a dot inspection. 105 max...

I bought my replacement on flea- bay for $25. It's the norgren and it was the exact replacement, even down to the billet aluminum screw on cover. They are on sale all the time. To the poster that has the truck air set to 105 psi, I hope you never get pulled over for a dot inspection. 105 max...

I replaced original (broken) stock with NOS Norgren regulator in GI packaging. It had NSN. I added schrader valve to gauge port for setting secondary side pressure. other than that, dead stock.

The stock reg is jet black and has a cylindrical metal cover that threads over the whole body. You have to unscrew that cover and slide off to gain access to the press adj knob. The two units I've seen fail were leaking from the adj knob area. My prior thread post has pix so you can Id it. The...

I agree regarding adjusting the reg. I replaced mine with the original NOS Norgren from fleabay and found there was no way to measure the pressure, so I rigged a schrader valve. I have a thread posted with pictures describing it.

I did the oil bit 3 times and noticed that after time 1 & 2 a big improvement in how the air-o-matic system worked. That is the Sycon trade name. They still sell & repair this system - at least they did in December when I was looking for answers like you are now. The oil stopped a slow leak...

The converging hoses are the exhaust hoses. The intake is a single hose and there are two hoses to the ram itself - 4 hoses total. The load sensor may have a sticking point where it leaks across from intake to exhaust. MAny members have been successful pouring a little Marvel Mystery oil or...