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Mini Excavators

Caterpillar serves all regions of the world so we build many different configurations of hydraulic excavators. Your Cat® dealer has exact machine specifications available in your area to help you choose what will best meet your needs.

300.9D Mini Hydraulic Excavator

Caterpillar is pleased to announce the introduction of the 300.9D sub 3 tonne 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.

Product Details


Engine Model Yanmar 31NV70
Net Power 9.6 kW
Rated speed 2100 RPM
Battery 12 V, 20 Amp
Diesel tank volume 10 L
Displacement 854 cm3
Flywheel output ISO 9.6 kW
Gross Power (ISO 14396) 13.7 kW
Make/type Yanmar 31NV70
Maximum engine output 13.7 kW
Type Water cooled model 3-cylinder diesel engine


Operating Weight 935 kg


Boom swing angle (Left) 55 Degrees
Boom swing angle (Right) 56 Degrees
Height with ROPS safety frame folded down 1507 mm
Height with ROPS safety frame unfolded 2276 mm
Length of undercarriage 1220 mm
Maximum Digging Depth 1731 mm
Maximum Dump Height 2035 mm
Maximum dig height 2863 mm
Maximum dozer dig depth 174 mm
Maximum dozer lift height 197 mm
Maximum reach 3074 mm
Maximum reach at ground level 3023 mm
Maximum vertical dig depth 1349 mm
Minimum front linkage swing radius 1150 mm
Tail swing radius 736 mm
Track width 180 mm
Transport length (arm lowered) 2746 mm
Undercarriage Width - Extended 864 mm
Undercarriage Width - Retracted 711 mm
Width 730 mm

Hydraulic System

Pumps 2 gear pumps
Discharge capacity 11.4 + 11.4 L/min (3 + 3 gal/min)
Hydraulic tank capacity 14 L
Operating pressure for the work and travel hydraulics 170 bar
Operating pressure pivot 70 bar

Chassis and Swivel Gear

Gradeability 30°/58%
Ground clearance 127 mm
Ground pressure 0.25 kg/cm2
Machine swing speed 8 RPM
Number of rollers per side 2
Track width 180 mm
Travel speed 1.8 km/h

Operating Specifications

Machine Overhang 318 mm
Stick Length - Standard 890 mm

Dozer Blade

Dig depth 174 mm
Height 200 mm
Lift height 197 mm
Width 700 mm


Operating weight with Safety frame 985 kg
Operating weight without Safety frame 935 kg

Noise Emissions

Sound power level (LWA) (to 2000/14/EG) 93 dB(A)

Operational Data

Digging force - Bucket 8.9 kN
Digging force - Stick 4.5 kN
Operating weight with Safety frame 985 kg
Operating weight without Safety frame 935 kg

Compact Dimensions

Easy site access

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.

Performance and Durability

Powerful performance, Robust construction, Work tool ready

Powerful Engine and Hydraulics

The 13.7 kW (18 hp) engine and perfectly matched hydraulics provide efficient, economical and reliable performance for the toughest of jobs. The matched cooling system is designed to accommodate working within confined areas and also the powerful Cat® hammer. Low noise and vibration levels deliver comfortable operation.

Hose and Cylinder Protection

Bucket hoses are well protected within the boom and the cylinder is mounted above the structure to increase the machines durability for working in tough environments. The clean lines of the front linkage also provide excellent visibility to the digging area.

Auxiliary Hydraulics as Standard

The 300.9D is fitted with auxiliary lines for hammer operation routed down to the stick. Locating the connecting point close to the work tool reduces connecting hose lengths and potential for damage.

User Friendly Operation

Simple controls - Easily maintained

Simple Controls (Ease of Use)

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

Extending Dozer Blade

Blade extensions simply rotate and lock into position allowing the machine to be quickly configured for narrow width or maximum blade coverage. Locking pins and extension plates are retained with the machine to reduce potential for lost or damaged components.


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.

Customer Support

Low operating costs with excellent services and options

Customer Support

Product supported through the Cat dealer and worldwide parts network aimed at minimizing downtime.
  • Finance options
  • Warranty options
  • Maintenance contracts
  • Help and advice in product and option selection to maximize efficiency and operating profitability

Work Tools

A range of tools is available to take advantage of the machines versatility. All tools are matched to the machine to optimize performance and deliver excellent value through high productivity and long life.
  • Adjustable vinyl seat
    • Auxiliary hydraulic circuit, with one-way (hammer) lines to stick
      • Boom mounted work light
        • Dozer blade, with side extensions
          • Ecology drain for hydraulic tank
            • Hydraulic extending undercarriage
              • Retractable seatbelt
                • Rubber belt track, 180 mm (7 in) wide
                  • 2 way (auger) auxiliary lines to the stick
                    • 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
                                Built for it