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What engine do you have ? If it is a NH250 Fleetguard offers such an adapter as Adaptor Kit #2, N 3300923 Ought to be available either on line someplace or from a big truck dealer or parts house or a Cummins dealer in your area. I got mine from the Cummins dealer in Phoenix.

NSN for fan belts appears to be 3030-01-118-1318.

The parts book for the 939 series truck is available on this site. You can look it up yourself which will yield a NSN which most auto parts stores can translate into a Gates or whatever number.

White smoke when running ? This may indicate coolant leaking into the combustion chamber and being burned with the fuel. Take the cap off the expansion tank and see if the engine is blowing bubbles within which would suggest a blown head gasket.

Winch disconnected ? Did you get a chance to ask the previous owner why ? Keep unauthorized and untrained users from messing with it ? Hydraulic problem ? Mechanical problem ? A working winch can be a useful item in an area described as being more rugged than combat.

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...

Reference is made to post 6: the trucks in question were issued to the unit in the spring of 1988 and had been shipped directly from the AM General point of manufacture, South Bend IN I think. At this distance in time I do not know if they had been held at the factory before being issued but I...

The size of the spare tire carrier raises a question but the unit I was in at the time received brand new M923s with the same tires as this truck and also without a CTIS. At the same time other units got them with 1100:20s. The CTIS version appeared a couple of years later.