300.9D Mini Hydraulic Excavator



Technical Specifications
Benefits and Features

Caterpillar is pleased to announce the introduction of the 300.9D sub 3 ton mini excavator machine. The 300.9D expands the Cat® Mini Excavator offering. Most notably, the new 300.9D sub 1 tonne class provides customers with a lower cost unit for entrance into MHE ownership.

Net Power 13 HP
Engine Model Yanmar 31NV70
Rated Speed 2100 r/min
Battery 12 V, 20 Amp
Diesel Tank Volume 2.64 gal (US)
Displacement 52 in³
Flywheel Output ISO 13 HP
Gross Power - ISO 14396 18 HP
Make/Type Yanmar 31NV70
Maximum Engine Output 18 HP
Type Water cooled model 3-cylinder diesel engine
Emissions Meets U.S. EPA Tier 4 Final/EU Stage V emission standards.
Operating Weight 2061 lb
Operating Weight - With Safety Frame 2170 lb
Operating Weight - Without Safety Frame 2061 lb
Dig Depth 68 in
Boom Swing Angle - Left 55 °
Boom Swing Angle - Right 56 °
Height - With ROPS Safety Frame Folded Down 4.94 ft
Height - With ROPS Safety Frame Unfolded 7.47 ft
Length - Undercarriage 4 ft
Maximum Dig Height 9.39 ft
Maximum Dozer Dig Depth 7 in
Maximum Dozer Lift Height 8 in
Maximum Dump Height 6.68 ft
Maximum Reach 10.09 ft
Maximum Reach - Ground Level 9.92 ft
Maximum Vertical Dig Depth 4.43 ft
Minimum Front Linkage Swing Radius 3.77 ft
Tail Swing Radius 2.41 ft
Track Width 7 in
Transport Length - Arm Lowered 9 ft
Undercarriage Width - Extended 2.83 ft
Undercarriage Width - Retracted 2.33 ft
Width 2.4 ft
Hydraulic System
Pumps 2 gear pumps
Discharge Capacity 11.4 + 11.4 L/min (3 + 3 gal/min)
Hydraulic Tank Capacity 3.7 gal (US)
Operating Pressure Pivot 1015 psi
Operating Pressure for the Work and Travel Hydraulics 2466 psi
Operational Data
Digging Force - Bucket 2000 lb
Digging Force - Stick 1011 lb
Operating Weight - With Safety Frame 2170 lb
Operating Weight - Without Safety Frame 2061 lb
Chassis and Swivel Gear
Gradeability 30°/58%
Ground Clearance 5 in
Ground Pressure 3.5 psi
Machine Swing Speed 8 r/min
Number of Rollers - Each Side 2
Track Width 7 in
Travel Speed 1.12 mile/h
Operating Specifications
Machine Overhang 12.5 in
Stick Length - Standard 34.8 in
Dozer Blade
Dig Depth 7 in
Height 8 in
Lift Height 8 in
Width 28 in
Noise Emissions
Sound Power Level (LWA) (to 2000/14/EG) 93 dB(A)

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.

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
  • Hammer
  • Rotating beacon

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