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Caging pins are used to cut out the parking brake to prevent it from engaging when the vehicle has to be towed and no air is available from the towing vehicle to keep the brake released. Super singles ? be prepared to replace at least 6 wheels and tires. If the wheels you get are stud piloted...

Installing fording plugs is part of the prep for deep water fording ops. The plug as seen in the pic is in a dummy hole designed to store it when not in use. The adjacent hole in the bottom of the bell housing is where it goes when in use. The plug is a pipe end similar to the check and drain...

Pic of caging pin in its' carrier on the side of a dual service brake chamber. Example shown is a M871A1 22.5t trailer but the one on a cargo truck is similar. The "T" shaped key on the end of the pin engages the spring in the brake chamber that holds the parking brake on when there is no air...

Another thought: This where the Army's belt and suspenders mentality helps: when the parking brake is caged you can secure the truck when parked with the hand brake on the transfer case. Civilian trucks do not have this so you have to chock it or take the caging pins out to keep it from rolling...

Also your truck has Budd wheels which means the lug nuts on the driver's side have left handed threads which means turn to the right to loosen. The rear wheels also have inner and outer lug nuts so if you have to remove an inside tire you have to deal with 20 lug nuts on and off. Be sure to...

Reference post 11: caging pins are used to compress the springs in the double service brake chambers used on the rear wheels that serve as the parking brake by holding the wedges out against the brake shoes. Air pressure is required to release the parking brake so when towing a dead horse it is...

While you are doing nothing check out the pubs relating to this vehicle which are available in the TM section on this site: operators' manual, organizational maintenance manual and related parts book, lubrication order. This truck has at least 40 grease points. Neglect them at your own peril...