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The Cat 307D Mini Hydraulic Excavator delivers superior performance and comfort while reducing your operating costs. The large spacious cab provides a comfortable work area. Intuitive seat-mounted controls are easy to use for greater job accuracy and efficiency. The standard tail swing design incorporates a counterweight that extends further back on the machine. This provides leverage to create a stable work platform during lifting and digging. The 307D sets the standard for conventional tail swing excavators in the eight-ton size class.


Engine Model Mitsubishi 4M40 TL Mitsubishi 4M40 TL Less
Net Power 55.6 hp 41.5 kW Less
Gross Power 57.6 hp 43.0 kW Less


Operating Weight 15598.0 lb 7075.0 kg Less
Operating Weight with Cab 15598.0 lb 7075.0 kg Less


Max digging depth - standard stick 13.3 ft 4050.0 mm Less
Max reach ground level - standard stick 20.2 ft 6150.0 mm Less
Length to Center of Rollers 20.6 ft 6290.0 mm Less
Max dump height - long stick 18.4 ft 5610.0 mm Less
Max dump height - standard stick 17.1 ft 5210.0 mm Less
Max vertical dig depth - standard stick 11.9 ft 3640.0 mm Less
Shipping Height 8.6 ft 2630.0 mm Less
Shipping Length 18.7 ft 5700.0 mm Less
Swing radius - rear 5.7 ft 1750.0 mm Less

Engine Dimensions

Bore 3.7 in 95.0 mm Less
Stroke 3.9 in 100.0 mm Less
Displacement 173.0 in3 2.83 L Less

Travel System

Gradeability (max) - high 35.0 Degrees 35.0 Degrees Less
Max traction force 12747.0 lb 56.7 kN Less
Travel Speed - High 3.1 mph 5.0 km/h Less
Travel Speed - Low 1.9 mph 3.1 km/h Less

Hydraulic System

Operating Pressure - Equipment 4061.0 psi 280.0 bar Less
Digging Forces - Stick (standard) 8138.0 lb 36.2 kN Less
Digging Force - Bucket 11061.0 lb 49.2 kN Less
Operating Pressure - Travel 4641.0 psi 320.0 bar Less
Operating Pressure - Swing 3481.0 psi 240.0 bar Less
Auxiliary circuit - primary 33.8 gal/min 128.0 L/min Less
Auxiliary circuit - secondary 16.9 gal/min 64.0 L/min Less

Swing System

Machine Swing Speed 10.0 RPM 10.0 RPM Less

Sound Levels

Exterior Cab 98.0 dB(A) 98.0 dB(A) Less
Interior Cab 79.0 dB(A) 79.0 dB(A) Less

Service Refill Capacities

Cooling System 4.1 gal 15.7 L Less
Engine Oil 3.3 gal 12.5 L Less
Hydraulic Tank 21.1 gal 80.0 L Less
Fuel Tank 35.7 gal 135.0 L Less
Hydraulic System 24.8 gal 94.0 L Less

MSC Comments

MSC Spec Date 1/06 1/06 Less

Operator Station

Simple, easy operation allows the operator to focus on production.


Powerful digging with precise control.


Clean, quiet and efficient.

Work Tools

Cat work tools are matched to meet your application needs.


Excellent stability.


Easy access and minimal maintenance requirements keep your machine on the job.

Customer Support

Unmatched support makes the difference.

307D Standard Equipment

  • Cab fully glazed
  • Interior light
  • Pillar mounted windshield wiper and washer
  • Air conditioning, heater and defroster
  • Bolt-on FOGS capability
  • Openable uppper front windshield
  • Removable lower front windshield
  • Openable skylight
  • Right and rear windows, polycarbonate
  • Sliding door window, tempered glass
  • Rear window, emergency exit
  • Seat, high back suspension, fabric covered, 4 way adjustment
  • Armrest, adjustable
  • Seatbelt 75 mm (3 in)
  • Coat hook
  • Cup holder
  • Literature compartment
  • Floor mat
  • Mirrors
  • AM/FM radio
  • Monitoring system, guages and indicators
  • Neutral lever hydraulic lockout
  • Joystick pilot operated controls
  • Auxiliary control, joystick (proportional control)
  • Travel control pedals with hand levers
  • Power supply, 12V
  • Dial type accelerator
  • Work light, cab-mounted
  • CAT HD batteries, (cold weather start)
  • Altenator 35 amp
  • Warning horn
  • 24-volt electric starting

  • MMC 4M40-TL Diesel Engine
  • Certified to meet U.S. EPA Interim Tier 4
  • Extended life coolant -37°C (-34°F)
  • Variable displacement load sense hydraulics
  • Combined function auxiliary hydraulic circuit
  • Quick disconnect fittings
  • Automatic swing parking brake
  • Control pattern changer
  • Travel alarm
  • Straight line travel
  • Boom check valve
  • Two speed auto-shift travel
  • Automatic engine idle
  • Boom lowering device (accumulator)
  • Reverse swing damping valve
  • 1,500 m (5,000 ft) altitude capability

  • Steel tracks, 450 mm (18 in)
  • Dozer blade with float function
  • Blade, weld on cutting edge
  • Grease lubricated track seals
  • Idler end track guiding guards
  • Hydraulic track adjusters

  • Caterpillar Corporate "One Key" System
  • Fuel cap, lockable
  • Doors, lockable
  • Stick, standard, thumb ready
  • Bucket linkage with lifting eye
  • Additional counterweight
  • Toolbox
  • Antenna
  • Pictograph films

307D Optional Equipment

  • Headrest for KAB 528P/C, T8P/C
  • Cab fan
  • Sun visor
  • Light, boom-mounted

  • Cooling package, high ambient
  • Starting kit, cold weather
  • Coolant, extended life -50°C (-58°F)
  • Medium pressure auxiliary lines
  • Hydraulic quick coupler lines

  • Segmented rubber track, 450 mm (18 in)
  • Bolt on rubber pads
  • Steel tracks, 600 mm (24 in)
  • Blade, bolt on cutting edge

  • Stick, long
  • Guard - Front screen cab and canopy
  • Guard - Vandalism
  • Guard - Falling objects
  • Guard - Swivel
  • Rain protector, cab front

  • Quick Couplers: Mechanical, Hydraulic, Pin Lock and Wedge Style
  • Buckets: Heavy Duty, Heavy Duty Rock, Ditch Cleaning and Pin Lock
  • Thumbs: Hydraulic, Full Rotation and Stiff Link
  • Auger
  • Hammer
  • Shear
  • Compactor