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The Cat® 306 Mini Hydraulic Excavator has been designed and built by Caterpillar to deliver exceptional performance, productivity, controllability and reliability at the lowest cost. To support your work, the Cat dealer network provides worldclass after sales support.


Engine Model 4M40 4M40 Less
Net Power 50.0 hp 37.6 kW Less
Bore 3.7 in 95.0 mm Less
Displacement 173.0 in3 2.84 L Less
Stroke 4.0 in 100.0 mm Less


Operating Weight 12730.0 lb 5775.0 kg Less

Hydraulic System

Digging Forces - Stick (standard) 5733.0 lb 25.5 kN Less
Digging force - bucket 8678.0 lb 38.6 kN Less
Main System - Maximum Flow 40.2 gal/min 152.0 L/min Less
Maximum Pressure - Implements 3550.0 psi 24500.0 kPa Less
Pilot system - maximum flow 4.9 gal/min 18.7 L/min Less
Pilot system - maximum pressure 493.0 psi 3400.0 kPa Less

Swing System

Machine Swing Speed 8.8 RPM 8.8 RPM Less
Swing Torque 9072.01 lb ft 12.3 kN·m Less


Width 76.8 in 1950.0 mm Less
Height 13.4 in 340.0 mm Less

Service Refill Capacities

Cooling System 4.1 gal 15.5 L Less
Engine Oil 2.9 gal 11.2 L Less
Hydraulic Tank 15.0 gal 57.0 L Less
Fuel Tank 35.7 gal 135.0 L Less
Hydraulic System 22.4 gal 85.0 L Less


Travel Speed 3.0 mph 4.8 km/h Less
Maximum Drawbar Pull 10836.0 lb 48.2 kN Less


Track Shoe Width (standard) 16.0 in 400.0 mm Less
Track Length 98.4 in 2500.0 mm Less
Number of Shoes (each side) 38 38 Less
Number of Track Rollers (each side) 5 5 Less
Number of Carrier Rollers (each side) 1 1 Less

Operator Station

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


Powerful digging with precise control.


Lower structure supports high production.


Clean, quiet and efficient.

Serviceability and Customer Support

Simplified service and maintenance save you time and money.


Jobsite safety is critical.

306 Standard Equipment

One piece boom

Standard stick - 1.6 m

766 mm width, 0.22 m3 capacity bucket with 5 tips

Bucket side cutters

Radial seal air filter

Water separator in fuel line

Auxiliary hydraulic valves (two)

Two speed travel

Air conditioner

Light, storage box mounted (one)

Cat one key security system

Door locks and cap locks

Signaling/warning horn

Boom drift reducing valve

Automatic swing parking brake

Counterweight, 510 kg

Cat maintenance free batteries

Openable front windshield

Windshield wiper and washer

Removable lower windshield

Interior lighting

Cup holder

Storage pocket


Radio mounting (meet DIN size)

Two stereo speakers and antenna

Washable floor mat

Working hour meter

Fabric suspension seat with headrest

Seat belt, 50 mm width

Blade with floating position

Towing eye on baseframe

Shoes, 400 mm triple grouser track shoe with holes (for rubber pad fit)

Electric re-fueling pump


GPS ready

306 Optional Equipment

Cab mounted light

Hand control pattern changer (two way)

AM/FM radio

Rearview mirror

Auxiliary hydraulic lines

Heavy-duty swivel guard

Quick coupler (manual)

Shoes, 400 mm triple grouser track shoe with rubber pad