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Lower your cost per ton. The Cat 323D3 Excavator brings increased speed, efficiency, and high productivity to your heavy duty, high-production applications. Work safely and in comfort in the high-visibility, highly adjustable cab.


Engine Power - ISO 9249 142.0 HP 106.0 kW Less
Engine Model Cat C7.1 Cat C7.1 Less
Engine Power - ISO 14396 151.0 HP 113.0 kW Less
Bore 4.0 in 105.0 mm Less
Stroke 5.0 in 135.0 mm Less
Displacement 428.0 in³ 7.01 l Less

Hydraulic System

Main System - Maximum Flow 400 l/min (106 gal/min) 400 l/min (106 gal/min) Less
Maximum Pressure - Equipment 5075.0 psi 35000.0 kPa Less
Maximum Pressure - Travel 5075.0 psi 35000.0 kPa Less
Maximum Pressure - Swing 3625.0 psi 25000.0 kPa Less

Swing Mechanism

Swing Speed 11.0 r/min 11.0 r/min Less
Maximum Swing Torque 45581.0 ft·lbf 62.0 kN·m Less


Operating Weight 50300.0 lb 22800.0 kg Less

Service Refill Capacities

Fuel Tank Capacity 108.3 gal (US) 410.0 l Less
Cooling System 7.4 gal (US) 28.0 l Less
Engine Oil 4.8 gal (US) 18.0 l Less
Swing Drive - Each 1.6 gal (US) 6.0 l Less
Final Drive - Each 1.3 gal (US) 5.0 l Less
Hydraulic System - Including Tank 68.7 gal (US) 260.0 l Less
Hydraulic Tank 36.5 gal (US) 138.0 l Less


Boom Reach 5.7 m (18'8") Reach 5.7 m (18'8") Less
Stick Reach 2.5m (8'2") Reach 2.5m (8'2") Less
Bucket SD 1.20 m³ (1.57 yd³) SD 1.20 m³ (1.57 yd³) Less
Shipping Height - Top of Cab 10.0 ft 3050.0 mm Less
Handrail Height 9.7 ft 2915.0 mm Less
Shipping Length 31.0 ft 9460.0 mm Less
Tail Swing Radius 9.0 ft 2750.0 mm Less
Counterweight Clearance 4.3 ft 1020.0 mm Less
Ground Clearance 1.5 ft 450.0 mm Less
Length to Center of Rollers 12.0 ft 3650.0 mm Less
Track Gauge 7.1 ft 2380.0 mm Less
Transport Width 9.5 ft 2980.0 mm Less

Working Ranges & Forces

Maximum Digging Depth 20.7 ft 6300.0 mm Less
Boom Reach 5.7 m (18'8") Reach 5.7 m (18'8") Less
Stick Reach 2.5m (8'2") Reach 2.5m (8'2") Less
Bucket SD 1.20 m³ (1.57 yd³) SD 1.20 m³ (1.57 yd³) Less
Maximum Reach at Ground Level 31.1 ft 9470.0 mm Less
Maximum Cutting Height 30.3 ft 9250.0 mm Less
Maximum Loading Height 20.7 ft 6290.0 mm Less
Minimum Loading Height 8.5 ft 2590.0 mm Less
Maximum Depth Cut for 2440 mm (8 ft) Level Bottom 19.6 ft 5960.0 mm Less
Maximum Vertical Wall Digging Depth 17.3 ft 5290.0 mm Less
Bucket Digging Force - ISO 31500.0 lbf 140.0 kN Less
Stick Digging Force - ISO 26600.0 lbf 118.0 kN Less


  • Get more done with improved cycle times, productivity, and fuel efficiency over the Cat® 320D2.
  • Move more, faster with a larger Cat 1.20 m3 (1.57 yd3) severe-duty bucket.
  • Expect reliable performance from the powerful Cat C7.1 mechanically controlled engine. The double-filtered low-pressure fuel system and antirust fuel tank protects the engine from lower quality fuel.
  • Balance power and efficiency using the open-center, negative flow control hydraulic system. Hydraulic cross-sensing makes full engine power always available from hydraulic pumps regardless of which function is used.
  • Dig and lift from a stable platform created by the standard 4.25 ton (9,370 lb.) counterweight and heavy-duty, eight-roller undercarriage.
  • Add versatility by adding tool control to run a hammer or other tools requiring one-way flow. Order tool control with the machine or add it later with a dealer-installed kit.
  • Product Link™ comes standard so you can remotely monitor machine health, location, hours, and fuel consumption on demand through the VisionLink® online interface.
  • The excavator has a high-ambient capability of 52° C (125° F) and cold start capability of –18° C (0° F). An optional –32° C (–25° F) cold start package is available.


  • Fuel efficiency (liters/ton) has improved over the previous 320D2 excavator.
  • Use 15 percent less fuel in Economy mode with no loss in lifting or digging forces.
  • Boom and stick regeneration circuits reduce fuel consumption by up to two percent while improving cycle times.
  • Use automatic engine speed control (AEC) during no-load or light-load conditions to automatically reduce engine speed to minimize fuel consumption.
  • Standard one-touch low idle saves fuel by instantly reducing engine speed to 1,100 rpm at the push of a button. Return the engine speed to the throttle position by hitting the button again or simply moving the joysticks.
  • New tandem hydraulic pumps provide seven percent more hydraulic power with less internal friction to increase overall efficiency. Each pump can produce a maximum flow of 200 L/min (52.8 gal/min). Hydraulic system components are close together to minimize power loss from friction and pressure drops.


  • A two-stage filtering system with integrated water separator protects the engine from particles larger than four microns when fuel quality is less than ideal.
  • We designed the stick and boom structures using high-tensile steel fabricated into a large box section using internal baffles to absorb torsional stress. The X-shaped, box-section car body provides excellent resistance to torsional bending, dissipating stress throughout the base of the machine.
  • Traverse the job site on the Grease Lubricated Track (GLT) undercarriage. Undercarriage rollers are rebuildable and sealed to prevent dirt and debris causing internal wear. Grease lubricated links minimize internal bushing wear, reducing noise and increasing life up to 25 percent.
  • Robust bottom guards protect machine components that might be damaged while swinging. A thicker bottom guard plate is used under the pump compartment to protect the suction hose.
  • Hydraulic snubbers in the boom and stick cylinders dampen end-of-stroke impact prolonging the life of your machine.
  • Safety fuses protect critical electrical components. Thick braiding protects the colored, numbered electrical wires. Non-abrasive connectors keep wiring harnesses in place to prevent failure.
  • The capsule-type hydraulic return filter prevents contaminants from entering the system when hydraulic oil is changed. If the filter clogs, a warning is displayed on the monitor screen inside the cab.
  • The swing system uses a ball bearing to help absorb stresses caused by swing torque.
  • The standard, integrated idler guard helps maintain track alignment while traveling or working on the slopes.


  • The spacious cab provides excellent visibility from the operator’s seat to keep you aware of your surroundings -without bending or straining to see.
  • Critical machine information is always visible in the new high resolution 178 mm (7 in) monitor. Intuitive menus mean more time working and less time looking for information.
  • Work a full day with less fatigue using the ergonomically-designed pilot-operated joysticks matched to operator’s wrist and arm position. Joystick consoles can be adjusted, further improving operator comfort and productivity.
  • Automatic climate control helps maintain consistent cab temperature. Five outlets ensure proper air circulation to keep you comfortable regardless of outside temperatures.
  • Keep your phone or other personal electronics charged using the two standard 12V auxiliary power ports delivering up to 10 A of power.
  • Seat adjusts to accommodate a variety of operator size and weight. Wide adjustable armrests and retractable seatbelt are also included.
  • Standard Cab Equipment. To enhance operator comfort and productivity, the cab includes a lighter, drink holder, coat hook, service meter, literature holder, magazine rack and storage compartment.
  • There is plenty of room for you to store your gear. There are two storage locations at the rear of the right console and one space for your lunchbox behind the seat.


  • The standard hydraulic lockout lever prevents operators from leaving the cab without first isolating all hydraulic functions. When necessary, you can activate the ground level shut-off switch to stop the fuel to the engine and shut down the machine.
  • The machine provides you a safe work platform for all routine service and maintenance needs. Anti-skid plating with countersunk bolts reduces the potential for slippage and trip hazards.
  • A battery disconnect switch helps to deter theft by isolating the battery and enhances safety when servicing the machine.
  • A full-length firewall separates the engine from the hydraulic pump and offers protection in the event of an incident.
  • We designed the cab to provide excellent visibility from the operator’s seat. In addition, two standard mirrors help keep you aware of your surroundings.
  • The machine can be equipped with a Falling Object Guarding System (FOGS) guard that conforms to the ISO 10262 standard. These guards are bolted directly to the cab shell.


  • Lower your maintenance costs by up to five percent with 20 percent less refill oil volume than the 320D2 and maintenance free batteries.
  • Easily maintain your machine. Most service locations are easily accessible at ground level to allow service and maintenance to get completed quickly and efficiently. A service door on the right side of the upper structure allows ground-level access to the hydraulic pumps, hydraulic filters, engine oil filter, and fuel filters.
  • Easily access the proven, high-efficiency radial seal engine air filter behind the cab. The machine constantly monitors the engine air filter and will notify you, via the monitor, when service is required.
  • A remote greasing block on the boom allows the greasing of hard-to-reach locations. A remote mounted greasing point on the swing bearing allows ease of service.
  • Robust service doors open wide for easy access to service points. Latches firmly hold the doors in the open position to prevent accidental closing while servicing – even on windy days. On the top of the machine, the large engine hood provides easy access to the engine and cooling compartments.
  • There is no need to manually prime the fuel system after fuel filter changes. The standard electric priming pump reduces the risk of contamination by preventing unfiltered fuel from entering the fuel system.
  • Routine cleaning is made easier with the single plane cooling package design.

323D3 Standard Equipment

  • Standard and optional equipment may vary. Consult your Cat dealer for details.

  • Mechanically adjustable seat with seatbelt
  • Auto bi-level air conditioner
  • Sound suppresed cab with viscous mounts
  • Openable skylight, openable upper windshield and removable bottom windshield
  • Full color 178 mm (7 in) LCD monitor

  • Cat Product Link

  • 52° C (125° F) high-ambient cooling capacity
  • 4000 m (13,120 ft) altitude capability
  • Radial seal air filter with double filter element
  • One-touch low idle with auto engine speed control
  • Two selectable power modes
  • Biodiesel capability up to B20
  • Electric fuel priming pump
  • Two stage fuel filtration system with water separator and indicator

  • Boom and stick drift reduction valve
  • Reverse swing damping valve
  • High performance hydraulic return filter
  • Boom and stick regeneration circuit
  • Auto two-speed travel

  • 2.5 m (8'2") heavy duty reach stick
  • 5.7 m (18'8") heavy duty reach boom

  • Tie down points on base frame
  • 4250 kg (9,370 lb) counterweight
  • 600 m (24") triple grouser shoes (12 mm/0.5" thick)
  • Center track guiding guard
  • Grease lubricated track links

  • Two 1,000 CCA maintenance free batteries
  • Halogen chassis light, left-hand boom light, cab lights

  • Radiator screen
  • Sampling ports for Scheduled Oil Sampling (S.O.SSM)
  • Single plane cooling arrangement

  • Signaling/warning horn

323D3 Optional Equipment

  • Control pattern changer
  • Roll down sun screen

  • -32° C (-25°F)
  • Engine air pre-filter

  • Quick coupler circuit for Cat Pin Grabber
  • Hammer return filter circuit
  • High-pressure auxiliary circuit
  • Fine swing control

  • Heavy duty track roller
  • 600 mm (24") triple grouser shoes (10 mm/0.4" thick)
  • Segmented track guiding guard