Replacing M4 Tank Final-Drive Assemblies

Instructions for replacing the final-drive assembly on the M4 Sherman tank, from Army Motors, Vol. 6, No. 2, Maintenance Division, Office, Chief of Ordnance, May 1945.

Replacing M4 Tank Final-Drive Assemblies

Time was when M4 medium tanks with damaged power trains had to run home to mother for mending–like little apple-filchers with buckshot in their final drive assemblies. Now, when your M4-series job (or related gun or howitzer motor carriage) has something more like dribble where the drive should be, you don’t have to pack it off to some 4th-echelon tank hospital for a slow cure. Instead, you can put in a whole new controlled differential and transmission final-drive assembly right there in the field, according to TB ORD 275.

Four of these assemblies, complete with everything but whistles, have at last been made authorized items of issue for lower echelon installation. They are:

—  1-piece differential housing, single-anchor-brake type, Ord. Part No. A5700061, Official Stock No. G104-5700061.

—  1-piece differential housing, double-anchor-brake type, Ord. Part No. A5700062, Official Stock No. G104-5700062 (Fig. 1).

—  3-piece differential housing, single-anchor-brake type, Ord. Part A5700060, Official Stock No. G104-5700060 (Fig. 2).

—  3-piece differential housing, double-anchor-brake type, Ord. Part No. A57000196, Official Stock No. G104-57000196.

They’ll be assembled at your favorite base shop or Ordnance supply depot from parts and housings already in stock or made available through cannibalization. No important difference between any of them, and they’re all yours for the asking.

Final Drive Assembly

All you have to do is install ’em and send back the has-beens. But remember that the whole system will break down if you don’t send back complete assemblies. Only the final-reduction sub-assemblies (A294625) should be removed from a damaged unit before its sent to the rear for reconditioning.

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Ordnance Assembly of Crated Trucks

Ordnance WW2 Mediterranean Theater Operations The following pictures of uncrating and assembly of GMC CCKW trucks appeared in Ordnance Activities in the Mediterranean Theater of Operations, November 1942 – June 1945 published by the Ordnance Department. The GMC CCKW 2½ ton 6×6 cargo truck was typically shipped in crates as shown below, and assembled by Ordnance personnel in theater.

Through North Africa, Sicily, and Italy, the Ordnance Service successfully supported the Allied forces as they slugged their way to victory in the MTO. In two and one half years of Ordnance Service in MTOUSA, the shops repaired 1,307,382 small arms; renovated 249,979 rounds of artillery ammunition; assembled 126,669 vehicles and did repair work on 341,048 vehicles of all types; repaired 247,242 pieces of artillery; and repaired 846,863 tires. Ordnance provided critical transportation throughout the theater, and the unpacking and assembly of crated trucks was a key part of that effort.

GMC CCKW 2½ ton Truck Crated WW2

This is how a 2½ ton truck is received in case you didn't know.

GMC CCKW 2 1/2 ton Truck Begins to Take Shape in WW2 Ordnance Center

A GMC begins to take shape.

WW2 Ordnance Final Assembly of GMC CCKW Truck

As the body goes onto the chassis, and after it has had a test run, another truck will be ready for issue to the using arms.