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The D Series incorporates innovations for improved performance and versatility.


Engine Model Cat® C6.4 ACERT™ Cat® C6.4 ACERT™ Less
Net Flywheel Power 138.0 hp 103.0 kW Less
Bore 5.12 in 102.0 mm Less
Displacement 389.0 in3 6.37 L Less
EEC 80/1269 138.0 hp 103.0 kW Less
ISO 9249 138.0 hp 103.0 kW Less
SAE J1349 138.0 hp 103.0 kW Less
Stroke 5.12 in 130.0 mm Less


Operating Weight 48752.0 lb 22160.0 kg Less
Operating Weight – Std. Undercarriage 48752.0 lb 22160.0 kg Less


Number of Carrier Rollers each side 2 2 Less
Number of Shoes each side 45 45 Less
Number of Track Rollers each side 7 7 Less

Swing Mechanism

Swing Speed 11.5 RPM 11.5 RPM Less
Swing Torque 45600.0 lb ft 62.0 kN·m Less


Maximum Drawbar Pull 46310.0 lb 206.0 kN Less
Maximum Travel Speed 3.4 mph 5.5 km/h Less

Hydraulic System

B1 Family Bucket Cylinder – Bore 4.7 in 120.0 mm Less
B1 Family Bucket Cylinder – Stroke 43.5 in 1104.0 mm Less
Boom Cylinder – Bore 4.7 in 120.0 mm Less
Boom Cylinder – Stroke 49.6 in 1260.0 mm Less
Main System – Maximum Flow (Total) 54.0 gal/min 205.0 L/min Less
Maximum Pressure – Equipment 5076.0 psi 35000.0 kPa Less
Maximum Pressure – Swing 3626.0 psi 25000.0 kPa Less
Maximum Pressure – Travel 5076.0 psi 35000.0 kPa Less
Pilot System – Maximum Flow 8.6 gal/min 32.4 L/min Less
Pilot System – Maximum Pressure 566.0 psi 3900.0 kPa Less
Stick Cylinder – Bore 5.5 in 140.0 mm Less
Stick Cylinder – Stroke 59.2 in 1504.0 mm Less

Service Refill Capacities

Cooling System 6.6 gal 25.0 L Less
Engine Oil 8.0 gal 30.0 L Less
Final Drive (each) 2.6 gal 10.0 L Less
Fuel Tank Capacity 108.0 gal 410.0 L Less
Hydraulic System (including tank) 69.0 gal 260.0 L Less
Hydraulic Tank 32.0 gal 120.0 L Less
Swing Drive 2.1 gal 8.0 L Less


Brakes SAE J1026 APR90 SAE J1026 APR90 Less
Cab/FOGS SAE J1356 FEB88 SAE J1356 FEB88 Less
Inside cabin noise ANSI/SAE J1166 OCT98 ANSI/SAE J1166 OCT98 Less

Engine and Hydraulics

The Cat® 320D delivers the power and control that you need in order to get the job done quickly and efficiently in all applications.


Cat® excavators are designed to handle the most rugged operating conditions while providing long life and value.


Machine protection for the most demanding working conditions.

Operator Station

Designed for comfort, simple and easy operation, the 320D allows the operator to focus on production.

Booms and Sticks

The 320D is equipped with a HD boom and Reinforced stick.

Work Tools – Attachments

A variety of work tools, including buckets, fixed grapples and rotating grapples.

Service and Maintenance

Simplified service and maintenance features save you time and money.

Complete Customer Support

Cat dealer services help you operate longer with lower costs.

Cat® 320D Total Solutions

Your excavator is more than a piece of equipment; it’s your livelihood.

320DStandard Equipment

  • Alternator, 50A
  • Light, storage box mounted (one)
  • Signaling/warning horn
  • Cat Data Link with capability of E.T.
  • Product Link ready

  • Cab falling objects guard top and front
  • Heavy duty bottom guards
  • Swivel guard
  • Heavy duty track motor guards
  • Heavy duty catwalks

  • Stick drift reducing valve
  • Straight travel hydraulic circuit
  • Regeneration circuit for boom and stick
  • Automatic swing parking brake
  • Boom drift reducing valve
  • Boom lowering device for back-up
  • Capability of stackable valves for main valve (maximum three valves)
  • Capability of auxiliary circuit (auxiliary pump and valves)
  • Capability of boom and stick lowering control device
  • Auxiliary hydraulic valve (one)
  • Reverse swing damping valve

  • C6.4 with ACERT™ Technology
  • 2300 m (7,500 ft) altitude capability with no deration
  • 2 micron fuel filter
  • Equivalent EU Stage II/EPA Tier 2 emission compliant
  • Air intake heater
  • Automatic engine speed control with one touch low idle
  • High ambient cooling package
  • Radial seal air filter
  • Water separator in fuel line with 10 micron fuel filter with water level indicator
  • Waved fin radiator with space for cleaning
  • Steel wall between engine and pump compartment
  • Two speed auto shift travel
  • Secondary engine shutoff switch

  • 790 mm (31 in) triple grouser track shoe
  • Grease lubricated GLT2, resin seal
  • Idler and center section track guiding
  • Towing eye on baseframe
  • Straddle mounted carrier rollers

  • Cab
  • Monitor

320DOptional Equipment

Full length track guiding guard

Upper guarding

Forestry fixed grapple

Forestry rotating grapple

Grapple hydraulics

Bucket 0.9 m3 (1.2 yd3) general purpose

Bucket 1.0 m3 (35.3 ft3) heavy duty