300.9D Mini Excavator

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The Cat 300.9D Mini Excavator delivers power and performance in a compact size to help you work in the tightest applications. Its ability to fit through a narrow doorway makes it an excellent machine for indoor demolition work.

Operational Data

Operating Weight - Without Safety Frame 2061.0 lb 935.0 kg Less
Digging Force - Bucket 2000.0 lb 8.9 kN Less
Digging Force - Stick 1011.0 lb 4.5 kN Less
Operating Weight - With Safety Frame 2170.0 lb 985.0 kg Less


Engine Model Yanmar 31NV70 Yanmar 31NV70 Less
Net Power 13.0 HP 9.6 kW Less
Rated Speed 2100.0 r/min 2100.0 r/min Less
Maximum Engine Output 18.0 HP 13.7 kW Less
Gross Power - ISO 14396 18.0 HP 13.7 kW Less
Diesel Tank Volume 2.64 gal (US) 10.0 l Less
Displacement 52.0 in³ 854.0 cm³ Less
Flywheel Output ISO 13.0 HP 9.6 kW Less
Battery 12 V, 20 Amp 12 V, 20 Amp Less
Type Water cooled model 3-cylinder diesel engine Water cooled model 3-cylinder diesel engine Less
Make/Type Yanmar 31NV70 Yanmar 31NV70 Less


Operating Weight 2061.0 lb 935.0 kg Less
Operating Weight - Without Safety Frame 2061.0 lb 935.0 kg Less
Operating Weight - With Safety Frame 2170.0 lb 985.0 kg Less


Undercarriage Width - Extended 2.83 ft 864.0 mm Less
Width 2.4 ft 730.0 mm Less
Height - With ROPS Safety Frame Folded Down 4.94 ft 1507.0 mm Less
Maximum Dump Height 6.68 ft 2035.0 mm Less
Maximum Digging Depth 5.68 ft 1731.0 mm Less
Maximum Dozer Lift Height 8.0 in 197.0 mm Less
Length - Undercarriage 4.0 ft 1220.0 mm Less
Maximum Vertical Dig Depth 4.43 ft 1349.0 mm Less
Minimum Front Linkage Swing Radius 3.77 ft 1150.0 mm Less
Boom Swing Angle - Left 55.0 ° 55.0 ° Less
Undercarriage Width - Retracted 2.33 ft 711.0 mm Less
Boom Swing Angle - Right 56.0 ° 56.0 ° Less
Maximum Reach 10.09 ft 3074.0 mm Less
Maximum Reach - Ground Level 9.92 ft 3023.0 mm Less
Transport Length - Arm Lowered 9.0 ft 2746.0 mm Less
Track Width 7.0 in 180.0 mm Less
Tail Swing Radius 2.41 ft 736.0 mm Less
Maximum Dozer Dig Depth 7.0 in 174.0 mm Less
Maximum Dig Height 9.39 ft 2863.0 mm Less
Height - With ROPS Safety Frame Unfolded 7.47 ft 2276.0 mm Less

Hydraulic System

Pumps 2 gear pumps 2 gear pumps Less
Discharge Capacity 11.4 + 11.4 L/min (3 + 3 gal/min) 11.4 + 11.4 L/min (3 + 3 gal/min) Less
Operating Pressure for the Work and Travel Hydraulics 2466.0 psi 170.0 bar Less
Operating Pressure Pivot 1015.0 psi 70.0 bar Less
Hydraulic Tank Capacity 3.7 gal (US) 14.0 l Less

Chassis and Swivel Gear

Gradeability 30°/58% 30°/58% Less
Travel Speed 1.12 mile/h 1.8 km/h Less
Track Width 7.0 in 180.0 mm Less
Ground Clearance 5.0 in 127.0 mm Less
Ground Pressure 3.5 psi 0.25 kg/cm² Less
Machine Swing Speed 8.0 r/min 8.0 r/min Less
Number of Rollers - Each Side 2 2 Less

Operating Specifications

Stick Length - Standard 34.8 in 890.0 mm Less
Machine Overhang 12.5 in 318.0 mm Less

Dozer Blade

Height 8.0 in 200.0 mm Less
Dig Depth 7.0 in 174.0 mm Less
Width 28.0 in 700.0 mm Less
Lift Height 8.0 in 197.0 mm Less

Noise Emissions

Sound Power Level (LWA) (to 2000/14/EG) 93.0 dB(A) 93.0 dB(A) Less

Compact Dimensions

With an overall width of only 730 mm (2 ft 5 in) the Cat® 300.9D can easily drive through narrow passages and doors. Both indoor and outdoor jobs are now accessible with the under 1000 kg (2,205 lb) weight making easy trailer transportation between sites possible.

Extending Undercarriage and Blade

An extending undercarriage and fold out dozer blade allow the machine to be configured for excellent working stability and optimum performance. Easy retraction, controlled from the operator's seat, enables the machine to pass through narrow openings.

Foldable Safety Frame

A protective ROPS safety frame structure mounted on the front of the machine allows fitting of a guard for extra operator protection during hammer use. The structure folds down in a few seconds for easy machine transportation and storage.

Simple Controls

The operator area is spacious and laid out to provide comfort and ease of operation. Smooth, precise operation is possible from easy to use controls allowing all skill levels to be productive with little practice.

Easy Service

Service and maintenance time is reduced to a minimum with a simple to open steel engine cover and all maintenance and greasing points easily accessible.


A range of tools is available to take advantage of the machine's versatility. All tools are matched to the machine to optimize performance and deliver excellent value through high productivity and long life.

300.9D Optional Equipment

2 way (auger) auxiliary lines to the stick (not available in all regions)

Bio oil

Buckets: 250 mm (10 in); 350 mm (15 in); 700 mm (2 ft 4 in)

Custom color paint

Front guard


Rotating beacon

Mini Excavator Attachment Options

Cat Mini Excavator attachment options let you get more out of your machines. Browse our attachment offerings to find the ones that are right for your business.

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Twice the coverage on compact machines

Caterpillar is introducing a new, 2-year machine standard warranty for Cat® Skid Steer Loaders, Compact Track Loaders, Multi Terrain Loaders and Mini Excavators in the U.S. and Canada.

Learn more

Swear by Equipment Management

Fuel costs. Labor costs. Maintenance costs. They can all tax your patience. But with timely, accurate data, you can better manage your equipment to keep operating expenses in line. Cat® EMSolutions offers everything you need to control costs, help your guys work better, reduce risks and get more done every day.

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