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Crafted to excel in underground utility and general construction within urban environments, this new Komatsu short tail swing excavator thrives in confined spaces. Highly transportable, it provides a high attachment flow with in-cab programmable flow rates for a diverse range of attachments.

  • Compact design for operation in confined areas
  • Compatible with a wide range of attachments
  • Ease of transport
  • Up to 13% reduction in fuel consumption compared to the prior model

Product Features and benefits:

Compact Design

The Komatsu excavator features a compact short tail swing design, offering maneuverability in tight spaces, such as single lanes of traffic or confined job sites. The conventional boom design contributes to this by providing a greater raising angle, effectively reducing the front bucket swing radius and enhancing the excavator’s versatility.

Fast Cycles and Custom Modes

The equipment is designed for fast cycles and custom modes to optimize performance. Faster boom up/swing speed, combined with responsive quick arm speed, simplifies excavating and leveling work, increasing efficiency over previous models. The excavator offers six working modes, allowing operators to tailor the machine’s performance based on the specific tasks, whether it’s for maximizing performance or achieving fuel savings.

Versatility and Efficiency

Standard high flow auxiliary hydraulics with proportional joysticks provide incredible job versatility and precise attachment control. The excavator comes with a standard grading blade featuring a new moldboard profile, improving backfilling and light grading efficiency compared to previous models.

Maximum Operator Comfort

Operators experience maximum comfort in the quiet, climate-controlled cab, equipped with an air suspension seat, Bluetooth radio, and a high-resolution monitor with a rearview camera. LED lights enhance visibility at night, and a sliding cab door makes entry and exit easier in confined spaces.

Fuel Efficient, Low-Cost Power

The excavator incorporates a new high-efficiency power package and viscous fan clutch to reduce overall fuel consumption by up to 13%*. A smart, simplified catalytic system removes soot without a diesel particulate filter, resulting in a lower cost of ownership and reduced maintenance.

Quick and Easy Maintenance

Periodic maintenance is made quick and easy with large service access doors and grouped service points that provide ground-level access. This design streamlines maintenance procedures, minimizing downtime and ensuring efficient equipment operation.

Overall, the Komatsu excavator combines compact design, fast cycles, operator comfort, and fuel efficiency to deliver a versatile and efficient solution for various construction and excavation tasks.

Product Specifications for PC78US-11:


  • Model: Komatsu SAA3D95E-1
  • Type: Water-cooled, 4-cycle, direct injection
  • Aspiration: Turbocharged, aftercooled, cooled EGR
  • Number of Cylinders: 3
  • Bore: 3.74 in
  • Stroke: 4.52 in
  • Piston Displacement: 149.5 in³
  • Horsepower:
    • SAE J1995 / Gross: 68.0 HP @ 1,900 rpm
    • ISO 9249 / SAE J1349 / Net: 67.9 HP @ 1,900 rpm
    • Rated rpm: 1,850
  • Fan Drive Method for Radiator Cooling: Mechanical with viscous fan clutch
  • Governor: All-speed control, electronic
  • EPA Tier 4 Final emissions certified


  • HydrauMind system (Hydraulic Mechanical Intelligence New Design)
  • Number of Selectable Working Modes: 6
  • Main Pumps:
    • Type: Variable displacement, axial piston
    • Maximum Flow: 44.4 gpm
    • Type (Blade): Fixed displacement gear
    • Maximum Flow (Blade): 17.0 gpm
  • Hydraulic Motors:
    • Travel: 2 x piston motor with parking brake
    • Swing: 1 x axial piston motor with swing holding brake
  • Relief Valve Setting:
    • Implement Circuits: 4,264 psi
    • Travel Circuits: 4,337 psi
    • Swing Circuit: 3,176 psi
    • Pilot Circuit: 464 psi
    • Blade Circuit (Raise): 1,784 psi
    • Blade Circuit (Lower): 3,060 psi
  • Hydraulic Cylinders (Number of Cylinders – Bore x Stroke x Rod):
    • Boom (1): 4.33 x 33.8 x 2.56 in
    • Arm (1): 3.74 x 33.9 x 2.36 in
    • Bucket (1): 3.35 x 27.95 x 2.17 in
    • Blade (1): 5.12 x 5.12 x 2.56 in
  • Auxiliary Hydraulics (Two-stage Relief):
    • Two-way: 36.5 gpm, Relief: 3,830 psi
    • One-way: 21.1 gpm, Relief in breaker mode: 2,490 psi

Drives and Brakes:

  • Steering Control: Two levers with pedals
  • Drive Method: Hydrostatic
  • Maximum Drawbar Pull: 15,309 lbf
  • Maximum Travel Speed:
    • High: 3.1 mph
    • Low: 1.9 mph
  • Service Brake: Hydraulic lock
  • Parking Brake: Mechanical discs

Swing System:

  • Driven by: Hydraulic motor
  • Swing Reduction: Planetary gear
  • Swing Circle Lubrication: Grease-bathed
  • Swing Lock: Mechanical disc brake
  • Swing Speed: 10 rpm


  • Center Frame: X-frame leg
  • Track Frame: Box-section
  • Track Type: Sealed
  • Track Adjuster: Hydraulic
  • Number of Shoes (Each Side): 39
  • Number of Carrier Rollers (Each Side): 1
  • Number of Track Rollers (Each Side): 5

Coolant and Lubricant Capacity (Refilling):

  • Fuel Tank: 33.0 US gal
  • Radiator: 4.8 US gal
  • Engine: 2.7 US gal
  • Final Drive (Each Side): 0.29 US gal
  • Swing Drive: 0.52 US gal
  • Hydraulic Tank: 14.8 US gal

Operating Weight (Approximate):

  • Track Shoes: Road Liner 18″
    • Operating Weight: 17,791 lbs
    • Ground Pressure: 5.20 psi
  • Track Shoes: Triple Grouser 18″
    • Operating Weight: 17,483 lbs
    • Ground Pressure: 5.20 psi
  • Track Shoes: Triple Grouser 24″
    • Operating Weight: 18,188 lbs
    • Ground Pressure: 3.90 psi
  • Track Shoes: Rubber Shoe 18″
    • Operating Weight: 17,438 lbs
    • Ground Pressure: 5.10 psi

Further information on this machine can be viewed by visiting this link

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DISCLAIMER: The information that has been provided in this article is sourced from The author does not assume any responsibility or liability for the accuracy, completeness, or usefulness of the information provided. The author shall not be held liable for any loss or damage resulting from the use of this content. For further information please contact the manufacturer directly.