New | 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.

Engine ModelYanmar 31NV70
Net Power13.0 hp
Rated speed2100.0 RPM
Battery12 V, 20 Amp
Diesel tank volume2.64 gal
Displacement52.0 in3
Flywheel output ISO13.0 hp
Gross Power (ISO 14396)18.0 hp
Make/typeYanmar 31NV70
Maximum engine output18.0 hp
TypeWater cooled model 3-cylinder diesel engine
Operating Weight2061.0 lb
Boom swing angle (Left)55.0 Degrees
Boom swing angle (Right)56.0 Degrees
Height with ROPS safety frame folded down4.94 ft
Height with ROPS safety frame unfolded7.47 ft
Length of undercarriage4.0 ft
Maximum Digging Depth5.68 ft
Maximum Dump Height6.68 ft
Maximum dig height9.39 ft
Maximum dozer dig depth7.0 in
Maximum dozer lift height8.0 in
Maximum reach10.09 ft
Maximum reach at ground level9.92 ft
Maximum vertical dig depth4.43 ft
Minimum front linkage swing radius3.77 ft
Tail swing radius2.41 ft
Track width7.0 in
Transport length (arm lowered)9.0 ft
Undercarriage Width - Extended2.83 ft
Undercarriage Width - Retracted2.33 ft
Width2.4 ft
Hydraulic System
Pumps2 gear pumps
Discharge capacity11.4 + 11.4 L/min (3 + 3 gal/min)
Hydraulic tank capacity3.7 gal
Operating pressure for the work and travel hydraulics2466.0 psi
Operating pressure pivot1015.0 psi
Chassis and Swivel Gear
Ground clearance5.0 in
Ground pressure3.5 psi
Machine swing speed8.0 RPM
Number of rollers per side2
Track width7.0 in
Travel speed1.12 mph
Operating weight with Safety frame2170.0 lb
Operating weight without Safety frame2061.0 lb
Dozer Blade
Dig depth7.0 in
Height8.0 in
Lift height8.0 in
Width28.0 in
Operating Specifications
Machine Overhang12.5 in
Stick Length - Standard34.8 in
Operational Data
Digging force - Bucket2000.0 lb
Digging force - Stick1011.0 lb
Operating weight with Safety frame2170.0 lb
Operating weight without Safety frame2061.0 lb
Noise Emissions
Sound power level (LWA) (to 2000/14/EG)93.0 dB(A)

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.

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.

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.

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.

Standard Equipment

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

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







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