Mack M123 tractor truck and M125 truck

The Mack M123 was a 10-Ton (9,072 kg) 6x6 gasoline-powered prime mover introduced in 1955; the Mack M125 was a 10-Ton heavy cargo truck version of the M123.

Each was subsequently upgraded with a diesel engine, as M123A and M125A, respectively. Both these saw service in the Vietnam War. (2)

M123
Variants:


 * M123 had dual winches and high mounted fifth wheel, gasoline engine


 * M123A1 had a singhel rear winch and a V-8 diesel engine (300 hp).


 * M123C had a single midship winch and low mounted fifth wheel, gasoline engine


 * M123D had dual midship winches and low mounted fifth wheel, gasoline engine


 * M123AC1, built from 1965 to 1969 by CONDEC, had a diesel engine and single rear winch


 * M123E1 were M123's that were re-engined with the diesel engine.


 * M123E2 with dual rear winches, diesel engine

In addition to the US Army, the M123 was used by the U.S. Marine Corps and exported to U.S. allies in such countries as Australia and Spain.

The last manufacturer of the M123 was the Consolidated Diesel Electric Corporation.

It was used to tow semi-trailers carrying MBT's (in conjunction with the M15A1 and later the M747 semi-trailer) and as such superseded the M26(A1) Pacific "Dragon Wagon") and semi-trailers carrying engineering equipment (e.g. in conjunction with the M 127 low bed semi-trailer).

Technical information
 * Engine: LeRoi T-H844 V8-cyl. 844 cuin ohv gasoline engine, 297 hp at 2600 rpm Later: Cummins V8-300 diesel rated at 300 hp horsepower at 3000 rpm.


 * Gearbox: Mack TRDXT72 5F1R


 * Tires: 14.00 x 24 inch.

M125
The M123-derived M125 succeeded the Mack NO as a heavy cargo transport vehicle; it also served as a prime mover towing the 155-mm gun and 8-in. howitzer. The chassis was designated M121. It had a 14-ft14 ft steel cargo body with folding troop seats, bows and canvas cover. A single front-mounted Gar Wood DSA716 45,000 lb capacity winch was fitted, and a chain hoist at rear for handling ammunition.

About 550 units were built.

Variant


 * M125A1 was fitted with the same Cummins diesel engine as the M123A.