Digging Force - Bucket2000 lb (8.9 kN)
Digging Force - Stick1011 lb (4.5 kN)
Operating Weight - With Safety Frame2170 lb (985 kg)
Operating Weight - Without Safety Frame2061 lb (935 kg)
Caterpillar is pleased to announce the introduction of the 300.9D sub 3 tonnemini 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.


Digging Force - Bucket2000 lb (8.9 kN)
Digging Force - Stick1011 lb (4.5 kN)
Operating Weight - With Safety Frame2170 lb (985 kg)
Operating Weight - Without Safety Frame2061 lb (935 kg)
Engine ModelYanmar 31NV70
Net Power13 HP (9.6 kW)
Rated Speed2100 r/min (2100 r/min)
Battery12 V, 20 Amp
Diesel Tank Volume2.64 gal (US) (10 l)
Displacement52 in³ (854 cm³)
Flywheel Output ISO13 HP (9.6 kW)
Gross Power - ISO 1439618 HP (13.7 kW)
Make/TypeYanmar 31NV70
Maximum Engine Output18 HP (13.7 kW)
TypeWater cooled model 3-cylinder diesel engine
Operating Weight - With Safety Frame2170 lb (985 kg)
Operating Weight - Without Safety Frame2061 lb (935 kg)
Operating Weight2061 lb (935 kg)
Boom Swing Angle - Left55 ° (55 °)
Boom Swing Angle - Right56 ° (56 °)
Height - With ROPS Safety Frame Folded Down4.94 ft (1507 mm)
Height - With ROPS Safety Frame Unfolded7.47 ft (2276 mm)
Length - Undercarriage4 ft (1220 mm)
Maximum Dig Height9.39 ft (2863 mm)
Maximum Digging Depth5.68 ft (1731 mm)
Maximum Dozer Dig Depth7 in (174 mm)
Maximum Dozer Lift Height8 in (197 mm)
Maximum Dump Height6.68 ft (2035 mm)
Maximum Reach10.09 ft (3074 mm)
Maximum Reach - Ground Level9.92 ft (3023 mm)
Maximum Vertical Dig Depth4.43 ft (1349 mm)
Minimum Front Linkage Swing Radius3.77 ft (1150 mm)
Tail Swing Radius2.41 ft (736 mm)
Track Width7 in (180 mm)
Transport Length - Arm Lowered9 ft (2746 mm)
Undercarriage Width - Extended2.83 ft (864 mm)
Undercarriage Width - Retracted2.33 ft (711 mm)
Width2.4 ft (730 mm)
Pumps2 gear pumps
Discharge Capacity11.4 + 11.4 L/min (3 + 3 gal/min)
Hydraulic Tank Capacity3.7 gal (US) (14 l)
Operating Pressure Pivot1015 psi (70 bar)
Operating Pressure for the Work and Travel Hydraulics2466 psi (170 bar)
Ground Clearance5 in (127 mm)
Ground Pressure3.5 psi (0.25 kg/cm²)
Machine Swing Speed8 r/min (8 r/min)
Number of Rollers - Each Side2
Track Width7 in (180 mm)
Travel Speed1.12 mile/h (1.8 km/h)
Machine Overhang12.5 in (318 mm)
Stick Length - Standard34.8 in (890 mm)
Dig Depth7 in (174 mm)
Height8 in (200 mm)
Lift Height8 in (197 mm)
Width28 in (700 mm)
Sound Power Level (LWA) (to 2000/14/EG)93 dB(A) (93 dB(A))

Benefits and Features

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 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 (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

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.