Gus, Jack and Willie Mack set up THE MACK BROS CO. in Brooklyn, New York, United States, in 1902. Their first vehicle was a "one off" Charabanc with a four cylinder 24 hp horizontally opposed petrol engine and chain drive. In 1903 a second vehicle was built. Series production commenced in 1904 and the vehicles were sold under the name of Manhattan.

A move to Allentown, Pennsylvania in 1905 resulted in the formation of the Mack Bros Motor Car Co. At this time the company commenced producing its first trucks bearing the name  "MACK".

During World War 1 in 1916, the AC models were introduced. These vehciles were soon nick named "Bull Dogs" by army engineers owing to their robust reliability under adverse battle field conditions. Subsequently Mack adpoted the bulldog emblem as part of its corporate identity. By this time the company was manufacturing a range of trucks from one ton to seven and a half tons capacity. In 1955 the "B" series came onto the market using the Scania-Vabis designed END673 ÒThermodyneÓ diesel engine

This prime mover was owned and operated by Mr Robertson of Hurstville, Sydney, N.S.W.  His wife Mrs Margaret Robertson donated it to the Association for display in the Bus and Truck Museum in memory  of her son Mr Sidney Richard Robertson (deceased).

A member completed restoration in 1996.
 

SPECIFICATION
Engine:
Six cylinder O.H.V. Mack diesel Bore 5", stroke 6" 707 CID (11.6 litre)

Transmission:
Twenty speed Quadruplex gearbox (twin gear sticks). Dual reduction spiral bevel and helical gear set differential.

Brakes:
Air operated foot brake, Spring emergency brake and transmission parking brake.