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300.9D Mini Hydraulic Excavator
300.9D Mini Hydraulic Excavator
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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.

Standard Equipment


Engine Model
Yanmar 31NV70
Net Power
13.0 hp
Rated speed
2100.0 RPM
12 V, 20 Amp
Diesel tank volume
2.64 gal
52.0 in3
Flywheel output ISO
13.0 hp
Gross Power (ISO 14396)
18.0 hp
Yanmar 31NV70
Maximum engine output
18.0 hp
Water cooled model 3-cylinder diesel engine

Noise Emissions

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


Operating Weight
2061.0 lb

Dozer Blade

Dig depth
7.0 in
8.0 in
Lift height
8.0 in
28.0 in

Operational Data

Digging force - Bucket
2000.0 lb
Digging force - Stick
1011.0 lb
Operating weight with Safety frame
2170.0 lb
Operating weight without Safety frame
2061.0 lb

Chassis and Swivel Gear

Ground clearance
5.0 in
Ground pressure
3.5 psi
Machine swing speed
8.0 RPM
Number of rollers per side
Track width
7.0 in
Travel speed
1.12 mph

Operating Specifications

Machine Overhang
12.5 in
Stick Length - Standard
34.8 in


Operating weight with Safety frame
2170.0 lb
Operating weight without Safety frame
2061.0 lb


Boom swing angle (Left)
55.0 Degrees
Boom swing angle (Right)
56.0 Degrees
Height with ROPS safety frame folded down
4.94 ft
Height with ROPS safety frame unfolded
7.47 ft
Length of undercarriage
4.0 ft
Maximum Digging Depth
5.68 ft
Maximum Dump Height
6.68 ft
Maximum dig height
9.39 ft
Maximum dozer dig depth
7.0 in
Maximum dozer lift height
8.0 in
Maximum reach
10.09 ft
Maximum reach at 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
7.0 in
Transport length (arm lowered)
9.0 ft
Undercarriage Width - Extended
2.83 ft
Undercarriage Width - Retracted
2.33 ft
2.4 ft

Hydraulic System

2 gear pumps
Discharge capacity
11.4 + 11.4 L/min (3 + 3 gal/min)
Hydraulic tank capacity
3.7 gal
Operating pressure for the work and travel hydraulics
2466.0 psi
Operating pressure pivot
1015.0 psi
Compact Dimensions

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

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

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

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