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It is probably the sprag needing adjusting or the air valve gummed up . These threads may help. front axle not engaging How to test if front axle is working M817 Air Blowing out of Top of Transmission 6x6 only engaging in reverse Front wheel drive Frustrating 809-series sprag!

Having a moderator change the title of the linked thread would do more good than starting a 3rd thread to link the other thread .

Welcome , your going to need to do some reading in the Technical manuals you have to remove the air line for the ctis . You should read this one before driving TM9-2320-272-10.pdf TM9-2320-272-10 Operations manual for the M939 series trucks. Sept 2004 It will save you from costly repairs...

Sounds mighty ILLEGAL , and not very wise to post on a internet forum.

www.jatonkam34s.com has them. They have the correct buckles and metal tip on the ends. link MISC. ITEMS HARD TO FIND, AND MUST HAVES

Just price out the wheel bearings between a A2 and A3 , everything on a A3 is golden.

Or a wheel cylinder . When was the last brake service on it ?

Sounds like a problem with your computer settings not the site search function .

bump

The best lockout hubs for a Deuce Locking hub on front and REAR of Bobbed DeuceBobbed deuce, lockout hubs...worth it? front lockout hubs or rear lockout and axle Lockout hubs front lockout hubs or rear lockout and axle Deuce lockout hubs Suggestion for Locking Hubs Lock out hubs Rear Lockout...

Download read this before the trip TM9-2320-272-10.pdf TM9-2320-272-10 Operations manual for the M939 series trucks. Sept 2004 You should also download the rest of the TM's and store on a laptop for the trip. TM's for the 939 series trucks

Testing Glow Plugs

Post #11 in this thread list them . m35a2 BRAKE REPLACEMENT Some good info in these also . TB-9-2300-426-20.pdf TB-9-2300-426-20 Hydraulic and Air Hydraulic Brakes preventive maintenance. TB43-0002-87.pdf TB43-0002-87 Brake fluid replacement procedure. Another good thread found by searching...

You need to list it in the classifieds , but to do that you need to upgrade to a premium membership ($15 ) . You can upgrade by clicking on "Upgrade" on the top toolbar . The moderators most likely will delete this thread.

So are you restoring it ?

You need to fix the worn parts as every thing needs to up to par to properly diagnosis it . It could be a problem with the king pins or some other worn part causing a bind.

Or the brakes could be froze up and have seized wheel bearings.

How wide is your trailer ?

I would still do the filters if you have not done them recently , winter is coming . If you haven't done so yet you can download the TM's free here . TM's for the 939 series trucksIt is highly recommended to read this one TM9-2320-272-10.pdf TM9-2320-272-10 Operations manual for the M939...

Time to service the air dryer. These threads should help you find the issue . M923 Not Building Air Pressure M923 Air Pressure not building past 45 PSI...ANy IDEAS? M923A2 Air pressure tops @ 65 psi M923a2 Air Dryer rebuild M923A2 Air Brake Pressure Issues M931A2 compressor does not pump?