The story
After the Second World War Caterpillar tested several big crawler prototypes, first with an adapted D13000 engine, before deciding the job needed a new power unit. Ten pre-production D9X machines went into evaluation in 1954, and full production of the D9 began in 1955 at East Peoria, Illinois.
Its six-cylinder D353 diesel was the first turbocharged engine in a Cat track-type tractor, rated at 286 hp and raised to 320 hp in the second year. Weighing about 29 tons bare, it was built with direct drive (18A) or a torque converter (19A), and over 4,300 were made.
The D9E replaced it in 1959, followed by the long-running D9G, the D9H, the elevated-sprocket D9L of 1980 and later the D9N, D9R and D9T.
Did you knowThe D9 was the first Caterpillar crawler with a turbocharged engine.
For sale
No Caterpillar D9 listings yet. Dealers and private sellers will be able to list them here soon.
Selling one?Specifications
| Engine |
|---|
| Maker | Caterpillar (D353) |
| Fuel | Diesel |
| Cylinders | 6 |
| Displacement | 24.1 L / 1473 cu in |
| Power |
|---|
| Rated engine power | 320 hp |
| Drive |
|---|
| Transmission | 4-speed direct drive with oil clutch (18A); torque converter drive (19A) |
| Hitch | Drawbar; dozer blade, rear ripper or winch fitted to order |
| Size |
|---|
| Weight | 26,300 kg / 58,000 lb |
| History |
|---|
| Built | 1955–1959 (pre-production D9X in 1954); D9 name continued through later series |
| Factory | East Peoria, Illinois, USA |
| Number made | Over 4,300 (18A and 19A combined) |
About these figures. First rated at 286 hp, raised to 320 hp from machine 18A1065 in the second year of production. Turbocharged, the first turbo diesel in a Cat track-type tractor. Later D9s: D9E 335 hp (1959), D9G 385 hp (1961–1974), D9H 410 hp (1974), D9L 460 hp (1980), D9N about 370 hp (1987), D9R about 405 hp (1996), D9T 410 hp (2004).
