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Well...
A red wrench is more than likely what you need.
Acetylene powered torch.
You can heat the nut on the bottom and throw an impact socket on it (wearing welding gloves) and go to town. Looking at the U-Bolt, it appears that you need to replace them especially in picture #3. Guessing...
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Most of the MK23 trucks that are being released these days had armor - that was removed. Selling now days with no doors and no top (roof).
Your guberment can't trust you to have armored doors...
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Welcome to the Outfit!
And by the way, since it is your new-to-you truck snap us up some pictures! You will be surprised what it looks like in a month or so as you do little projects. There are TM's (Technical Manuals) for that vehicle. The "Dash 10" (the book with a -10 at the end) is the...
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Oh yeah...
And don't forget turning the air cleaner "over" to expose the filter so the "engine could breathe better" trick too. Suck up the dirt and pile it up on the airbox...
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Welcome to the Outfit!
You may want to gather up the books for your New-To-You truck. The M931 is part of the 939 Series of vehicles and that is where you will find the TM's (Technical Manuals).
https://www.steelsoldiers.com/threads/updated-tms-tbs-mwos-for-the-m939.168990/...
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Other than @87cr250r 's suggestion about air in the system - is it possible that the suction hose side of the hydraulic system has cracks in it - from the tank to the pump - where it might be drawing air? Or maybe that the suction line might be collapsing? Maybe laying under the truck in a...
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I have a very technical version of a Battery Box Lock in the picture below.
Chain wraps around the frame.
Loop at the air tank drains.
I could upgrade it with some green paint.
Ohhhh and I almost forgot - the locking device design is Patent Pending
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Sure seems to me like you might have a grounding problem.
If the air pressure really went down to zero, you would slide to a stop when the spring brakes applied (automatically). That is what those extra chambers are made for on the rear axles.
On these trucks, the drivers may or may not...
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And... The absolute worst part of it all is THEY DON'T CARE.
Customers Service - Hah!
Quality of the Service they perform - Nope, Don't Care!
Government Job - Not getting paid nearly enough - Hah!
Somehow or another, we have managed to miss out on helping them remember that they work for us.
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It is possible to have a circuit breaker that would protect the winch wiring from chafing.
I would still use protective loom too!
The sample above is power directly powered from the starter.
Juice supplied is to drive a 4000 watt Inverter... (just fyi)
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It is a sucky job, but spending a couple of days sitting there in the Co-Driver's (passenger) seat of your truck - with the batteries disconnected - cleaning the contacts would improve your truck in a big way. Using Anti-oxident paste and/or anti-ox spray or contact cleaner and then paste...
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Maybe California has something that the other 49 states doesn't have?
The Lemon Law (especially here in our state) is only for new vehicles. Used vehicles are sold "AS IS". If the vehicle for example died as you were driving off the lot it isn't the manufacturer or sellers problem or...
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One "gotta ask" from me... Boom Support. The tubes on the left and right sides of the boom so that the hydraulics aren't supporting the boom. It's a heck of a neat looking picture but those supports keep things from going wrong. Taking a turn pulling something could cause the rotation...
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My version - hand built - no blueprints for my M936 is similar - but since I am perfectly capable of lashing things down, I didn't build sides for mine.
The front uprights were drilled and fitted onto the front windshield bolts. Used inch and a half angle around the perimeter and eighth...
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I have a light set very similar to yours. I attach the plug into the rear of the truck and I zip tie the cable to the thing I am dragging and use the cloth straps to affix it to the back of the towed vehicle. Problem has always been a place to properly stash the light bar. Running it like...
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