FMTV wheel locked

[MGKMartin]

My 1083a1 has been parked for a few months. Went to move it today and the middle right (passenger) wheel is locked. The other 5 turn but mid right drags without turning. Caged the brake on that side and still no luck. Has anyone experienced this before? Any idea what to check?

 

[Shark Bait]

Did you try going in reverse to break it loose?

 

[oregonfirefighter]

Have had this happen a few times....with mine it was the brakes sticking to the drums. Can of WD40 sprayed over the pads ( will smoke later) let sit overnight, then pop the edge of shoes with a hammer a couple of times. Once that didn't free them, so I took it out on asphalt put transmission into MODE then forward and backwards a few times and POP!

 

[MGKMartin]

Yes, both forward and reverse ~150- ft. on gravel. If it is just the pad rusted to the drum I can take it out on pavement and see if that breaks it free. Didn't know if there was something else going on and don't want to break something if I don't have to.

 

[Suprman]

You can get in and see the pads from behind. Cage the 2 cans and give the pads a whack.

 

[MGKMartin]

Both cans are cages, pads have been whacked. Anything else it is likely to be? If not, I will take it down to the asphalt and drive back and forth a bit and see if it will break free.

 

[snowtrac nome]

avoid petroleum products on brake friction surfaces. The shoes have rusted to the drums, this is pretty common, block the wheels so it cant roll, build air pressure release the brakes, and beat on the drums a couple of times with a bfh you will see the shoes pop loose set the brakes remove your blocks and drive into the sunset.

 

[Suprman]

I have had this happen multiple times on m939 trucks not lmtv and a good rocking usually does the trick. I dont want to see you ruin a tire though.

 

[MGKMartin]

Thanks all. Off to get the BFH.

 

[oregonfirefighter]

The WD-40 dvicd was given to me by an active duty Heavy Mech.... Told me thats what they use in the big ole sandbox.

avoid petroleum products on brake friction surfaces. The shoes have rusted to the drums, this is pretty common, block the wheels so it cant roll, build air pressure release the brakes, and beat on the drums a couple of times with a bfh you will see the shoes pop loose set the brakes remove your blocks and drive into the sunset.

 

[snowtrac nome]

petroleum products not only are flammable but will adversely affect the friction surface causing the wheel to lock up, that's why shoes are replaced when oil soaked. I had morons in the sand box telling me to remove all thermostats in vehicles under my control too. I argued the point got permission put in t-stats that were removed and replace the old ones. never had an engine fail out of my 80 vehicles we were responsible for. I found it impossible to explain to the bone head officers that the thermostat was needed to slow the flow of coolant to ensure proper heat exchange as well as to aid the engine in warm up . Back to the subject oil on your brakes is bad avoid ,it the linings are like a sponge you will never get it all out.

 

[MGKMartin]

Thank you all for the advice. Caged brakes + BFH + getting the truck off of gravel and down to the road and driving forward and back ~10 times finally broke the wheel free.

 

[FloridaAKM]

I have the same issue with a 1081, so I will give it a try this afternoon when it warms up a bit more here.Thanks in advance.

 

[Suprman]

If it's both rear wheels, as in brakes not releasing, the compounding valve can be stuck. Some air dryer alcohol in the system can help with that. Happens more in the cold though.

 

[Reworked LMTV]

If it's both rear wheels, as in brakes not releasing, the compounding valve can be stuck. Some air dryer alcohol in the system can help with that. Happens more in the cold though.

air dryer alcohol? What's that ?

 

[Suprman]

Before air dryers there were alcohol bottles on air systems to help with moisture. If its cold and you have frozen moisture in your air system you can put special alcohol in your air system. It goes in past the air dryer. Air system alcohol is probably better wording for it than air dryer alcohol. My mistake.

 

[Vintage iron]

If that wheel sticks repeatedly after you break it free and bust the rust off. Then you will need to tear down the wedge assemblies, clean them and lube them good. I have found the LMTV/FMTV don't have enough grease in the wedge assemblies and they will stick.

 

[Reworked LMTV]

Before air dryers there were alcohol bottles on air systems to help with moisture. If its cold and you have frozen moisture in your air system you can put special alcohol in your air system. It goes in past the air dryer. Air system alcohol is probably better wording for it than air dryer alcohol. My mistake.

Sorry, I guess I'm not sure that I understand you. Would you add alcohol to a newer type system after the drier? What type of alcohol is it? Would this loosen up the valve then by repeatedly hitting the brakes or something?

 

[snowtrac nome]

I prefer to refrain from alcohol unless it is an emergency. alcohol is a solvent and corrosive it will remove lube in your relay valves and cause corrosion.

 

[Reworked LMTV]

Would it be a good idea to lube all the valves, if so, with what lubricant??