Caterpillar D9
Type	Heavy bulldozer
Manufacturer	Caterpillar
Length	26.5 ft (8.1 m)
Width	14.7 ft (4.5 m) (blade)
Height	13 ft (4.0 m)
Weight	108,000 lb (48,988 kg)
Propulsion	Continuous track
Engine model	CAT C18 ACERT (D9T) 3408 HEUI (D9R)
Gross power	464 hp (346 kW) D9T 474 hp (353 kW) D9R
Flywheel power	410 hp (310 kW) D9T 410 hp (310 kW) D9R 375 hp (280 kW) D9N 460 hp (340 kW) D9L
Drawbar pull	71.6 tons
Speed	7.3 mph (11.7 km/h) Forward 9.1 mph (14.6 km/h) Reverse
Blade capacity	17.7 cu yd (13.5 m3) 9 SU blade 21.4 cu yd (16.4 m3) 9 U blade

 

D9H

 

CAT D9L, the first D9 model to employ the "high drive" configuration. 'High drive" refers to the position of the drive sprocket. The triangular track shape is caused by the need to accommodate the drive sprocket which is mounted high on the machine relative to ground level and higher than previous existing designs.

 

A Caterpillar D9N on a beach

 

CAT D9T, the current generation of the Caterpillar D9 tracked-type tractor series.

The Caterpillar D9 is a large track-type tractor designed and manufactured by Caterpillar Inc. It is usually sold as a bulldozer equipped with a detachable large blade and a rear ripper attachment.

The D9, with 354 kW (474 hp) of gross power and an operating weight of 49 tons, is in the upper end of Caterpillar's track-type tractors, which range in size from the D3 57 kW (77 hp), 8 tons, to the D11 698 kW (935 hp), 104 tons.

The size, durability, reliability, and low operating costs have made the D9 one of the most popular large track-type tractors in the world.