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Cat Mini Excavators 300.9D

Cat Mini Excavators 300.9D

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Last Updated : 2018-03-12
Operating weight(kg) 935.0 kg
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Compact Dimensions


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.

User Friendly Operation


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.

Performance and Durability


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.

Customer Support


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.


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.

Operational Data


Digging Force - Bucket2000.0 lb | 8.9 kN
Digging Force - Stick1011.0 lb | 4.5 kN
Operating Weight - With Safety Frame2170.0 lb | 985.0 kg
Operating Weight - Without Safety Frame2061.0 lb | 935.0 kg


Engine ModelYanmar 31NV70 | Yanmar 31NV70
Net Power13.0 HP | 9.6 kW
Rated Speed2100.0 r/min | 2100.0 r/min
Battery12 V, 20 Amp | 12 V, 20 Amp
Diesel Tank Volume2.64 gal (US) | 10.0 l
Displacement52.0 in³ | 854.0 cm³
Flywheel Output ISO13.0 HP | 9.6 kW
Gross Power - ISO 1439618.0 HP | 13.7 kW
Make/TypeYanmar 31NV70 | Yanmar 31NV70
Maximum Engine Output18.0 HP | 13.7 kW
TypeWater cooled model 3-cylinder diesel engine | Water cooled model 3-cylinder diesel engine


Operating Weight2061.0 lb | 935.0 kg
Operating Weight - With Safety Frame2170.0 lb | 985.0 kg
Operating Weight - Without Safety Frame2061.0 lb | 935.0 kg


Boom Swing Angle - Left55.0 ° | 55.0 °
Boom Swing Angle - Right56.0 ° | 56.0 °
Height - With ROPS Safety Frame Folded Down4.94 ft | 1507.0 mm
Height - With ROPS Safety Frame Unfolded7.47 ft | 2276.0 mm
Length - Undercarriage4.0 ft | 1220.0 mm
Maximum Dig Height9.39 ft | 2863.0 mm
Maximum Digging Depth5.68 ft | 1731.0 mm
Maximum Dozer Dig Depth7.0 in | 174.0 mm
Maximum Dozer Lift Height8.0 in | 197.0 mm
Maximum Dump Height6.68 ft | 2035.0 mm
Maximum Reach10.09 ft | 3074.0 mm
Maximum Reach - Ground Level9.92 ft | 3023.0 mm
Maximum Vertical Dig Depth4.43 ft | 1349.0 mm
Minimum Front Linkage Swing Radius3.77 ft | 1150.0 mm
Tail Swing Radius2.41 ft | 736.0 mm
Track Width7.0 in | 180.0 mm
Transport Length - Arm Lowered9.0 ft | 2746.0 mm
Undercarriage Width - Extended2.83 ft | 864.0 mm
Undercarriage Width - Retracted2.33 ft | 711.0 mm
Width2.4 ft | 730.0 mm

Hydraulic System

Pumps2 gear pumps | 2 gear pumps
Discharge Capacity11.4 + 11.4 L/min (3 + 3 gal/min) | 11.4 + 11.4 L/min (3 + 3 gal/min)
Hydraulic Tank Capacity3.7 gal (US) | 14.0 l
Operating Pressure Pivot1015.0 psi | 70.0 bar
Operating Pressure for the Work and Travel Hydraulics2466.0 psi | 170.0 bar

Chassis and Swivel Gear

Gradeability30°/58% | 30°/58%
Ground Clearance5.0 in | 127.0 mm
Ground Pressure3.5 psi | 0.25 kg/cm²
Machine Swing Speed8.0 r/min | 8.0 r/min
Number of Rollers - Each Side2 | 2
Track Width7.0 in | 180.0 mm
Travel Speed1.12 mile/h | 1.8 km/h

Operating Specifications

Machine Overhang12.5 in | 318.0 mm
Stick Length - Standard34.8 in | 890.0 mm

Dozer Blade

Dig Depth7.0 in | 174.0 mm
Height8.0 in | 200.0 mm
Lift Height8.0 in | 197.0 mm
Width28.0 in | 700.0 mm

Noise Emissions

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

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