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Truck apparently was built in 1971.

The 20P is the organizational parts book which will list the oil and fuel filter NSNs which will lead to the civilian equivalents.

If the filter is the same one used in a M809 series 5 ton the NSN is 2910-00-152-2033. Google this and it will reveal the civilian equivalents. The TMs associated with the M923 etc are in the 9-2320-272-10, 20, 20P. LO series. Read the reading. Don't make a move without the pubs. A 5 ton has...

The publications relevant to the vehicle will be listed on a data plate on the right side of the dashboard. Having never had a 900 series truck I do not know what the numbers are but they are surely in the TM section on this site. Get into the 20P organizational maintenance parts book and find...

The Army's solution to the spare tire issue when they started using vehicles other than M37s to pull these trailers was to put a spare on a bracket on the front of the body. This won't work if you have a tool box there and the tire was muscled on and off the trailer when needed: no hoist.

Reference post 104: both transmission, transfer, and all 3 differentials were issued with 1/2" square pipe ends for plugs so you need a 1/2" breaker bar or drive to open and close them. 5 tons have a square plug, commonly found on commercial trucks, that takes a 15/16" open end wrench to turn.

Not only the 3 in between the axles but also the drive shaft between the transfer case and the intermediate axle. There are a total of 12 grease fittings associated with the 4 drive shafts on the truck. The handbrake on the back of the transfer case will have 4 fittings of its' own. Drive on.

Greasing drive shafts: placing both the transfer case and transmission in neutral will allow you to rotate the driveshaft to access the grease points. If the drive shafts are correctly assembled all 3 grease fittings should face the same way. Jack up one of the front wheels will allow you to...

A deuce without a winch has something like 40 grease points. Neglect them at your own peril. Universal joints require careful attention: have one come apart for lack of lubrication at 40mph is a character building experience as is having a slip joint fail also.

Reference post 88: The -20 manual is not the place to look for info on locations on drain/fill plugs or what product to put in. This information is located in the lubrication order which in he case of a deuce is LO9-2320-209-LO. Most of the check plugs are pipe ends and a 1/2" drive will open...

The pic in post 21 suggests that what civilians call the "bulkhead" fitting is missing. These are common items and parts houses that sell parts for commercial trailers with air brakes would have them. There should be a dummy coupler on the end of the chain in the pic that keeps nesting insects...

If you plan to drive your truck on the road make sure you get a title or whatever documents your state requires to get a license plate. Parts are not as easy as they once were but some European units from the likes of France or Norway are being returned and sourced for parts. Such dealers...

In case you have not figured this out, the indentation in the right front fender is there to install a slave receptacle in which has not been done with this vehicle. The slave plug would be wired into the battery box which is above on the cowl. Slave plugs allow for quick jump starts without...

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...

Remember a 900 series truck as to be in high range to BACK IT UP.