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Caterpillar DD9H

Caterpillar DD9H tractor
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The Caterpillar DD9H was a bulldozer produced from 1974 to 1981. It consisted of two D9H tractors connected in tandem, controlled from the front tractor with pneumo-hydraulic controls. The front tractor included a 12 CFM compressor and two air supply tanks. It was powered by two Caterpillar D353 turbocharged 6-cylinder diesel engines with a combined net power of 820 hp (611.5 kW). The transmission was a 3-speed power shift. The tractor had crawler drive with planetary final drives and an optional cab with air-conditioning. It featured 24-inch tracks and weighed between 178,800 and 185,400 pounds. The main attachment was a 189-inch wide Caterpillar 9C front-mount hydraulic-lift blade.
Caterpillar DD9Hbulldozertractor specificationsCaterpillar D353 engine820 hp24 inch tracks1974-1981
Power-
Founded-
ModelDD9H

Technical Specifications

Detailed specifications and technical data for Caterpillar DD9H

Power

Engine (net):820 hp (611.5 kW)

Engine

Type:turbocharged diesel
Model:Caterpillar D353
Cooling:liquid-cooled inline
Starter:electric
Cylinders:6-cylinder
Fuel tank:460 gal (1741.1 L) *Combined capacity of both machines.
Bore/Stroke:6.25x8.00 inches (159 x 203 mm)
Power (net):820 hp (611.5 kW) *Combined output of both machines.
Displacement:1473 ci (24.1 L)
Oil capacity:45 qts (42.6 L)
Starter volts:24
Coolant capacity:164 qts (155.2 L)

Tracks

Width:24 inches (60 cm)
Area on ground:6338 in² (4.1 m²)
Length on ground:132 inches (335 cm)

Variants

DD9H:tandem D9s
SxS D9H:side-by-side D9Hs

Dimensions

Gauge:90 inches (228 cm)
Weight:178800 to 185400 pounds
Shipping weight:178800 lbs (81103 kg)
Operating weight:185400 lbs (84097 kg)

Electrical

Batteries:4
Battery AH:200
Battery volts:12
Charging amps:50
Charging system:alternator

Mechanical

Cab:optional with available air-conditioning
Drive:crawler
Final drives:planetary

Production

Type:Bulldozer
Built in:Peoria, Illinois, USA
Years made:1974 - 1981
Description:The DD9H consisted of two D9H tractors connected in tandem. The operator controlled both machines from the front tractor using pneumo-hydraulic controls. The front tractor was fitted with a 12 CFM compressor and two air supply tanks.

Attachments

Lift:hydraulic-lift
Blade:189" Blade
Model:Caterpillar 9C
Mount:front-mount
Width:189 inches (480 cm)
Height:71.5 inches (181 cm)

Transmission

Note:The Caterpillar DD9H consisted of two linked tractors so it had two D353 engines. Figures shown, except horsepower, are for a single engine.
Type:power shift
Gears:3 forward and reverse

Related Models

Caterpillar DD9H

Model:DD9H

Caterpillar SxS D9H

Model:SxS D9H