• Engine

    Model Komatsu 4D88E-7
    Type Water-cooled, 4-cycle, direct injection
    Aspiration Cooled EGR
    Number of Cylinders 4
    Bore x Stroke 88 mm x 90 mm
    Piston Displacement 2.189 ltr
    Horsepower, Gross - SAE J1995 29.1 kW / 39 HP
    Horsepower, Net - ISO 9249 / SAE J1349 28.3 kW / 38 HP
    Rated RPM 2400
    Fan drive method Mechanical
    Emissions certification EPA Tier 4 Final
  • Hydraulic System

    Type HydrauMind System
    Number of selectable working modes 2
    Main pump type Variable displacement, axial piston
    Pump for Boom, arm, bucket, and travel circuits
    Maximum flow 153.3 ltr/min
    Hydraulic Motors  
    Travel 2 x axial piston motors with parking brake
    Swing 1 x axial piston motor with swing holding brake
    Relief Valve Setting  
    Implement circuits 270 kgf/cm3
    Travel circuit 270 kgf/cm3
    Swing circuit 220 kgf/cm3
    Pilot circuit 32 kgf/cm3
    Hydraulic Cylinders Bore x Stroke x Rod diameter
    Boom 1-90 mm x 691 mm x 50 mm
    Arm 1-85 mm x 733 mm x 55 mm
    Bucket 1-75 mm x 580 mm x 50 mm


  • Drives and Brakes

    Steering control Two levers with pedals
    Drive method Fully hydrostatic
    Maximum drawbar pull 42 kN 4280 kgf
    Gradeability 30 %
    Travel speeds 2.6 / 4.6 km/h
    Service brake Hydraulic lock
    Parking brake Mechanical disc brake
  • Swing System

    Driven by Hydrostatic
    Swing reduction Planetary gear
    Swing circle lubrication Grease-bathed
    Service brake Hydraulic lock
    Swing lock Mechanical disc brake
    Swing speed 9 rpm
  • Undercarriage

    Center frame X-frame leg
    Track frame Box-section
    Track type Sealed track
    Track adjuster Hydraulic
    Number of shoes (each side) 39
    Number of carrier rollers (each side) 1
    Number of track rollers (each side) 4
  • Coolant & Lubricant capacity

    Fuel tank 65 ltr
    Coolant 8.9 ltr
    Engine 8.1 ltr
    Final drive, each side 0.7 ltr
    Hydraulic tank 55 ltr
    DEF tank None
  • Weights

    Operating weight 5,140 - 5,260 kg

PC55MR-5 Excavators

Now with a new technology Komatsu engine, our largest MR-5 excavator, the PC55MR-5, is ideal for contractors, rental fleets, owner-operators, builders – or anyone who needs a compact powerful excavator for confined conditions. It incorporates features of bigger Komatsu excavators, with key components designed and manufactured by Komatsu to work together in an integrated package. And it’s standard with our KOMTRAX remote monitoring and location system, backed by our Australia-wide service and support network.

  • 28.3 kW / 38 HP
  • 5,260 kg
  • 0.16 m³


Newly designed large-sized door

Cab entrance area is increased 17% (Compared with Komatsu’s current models) by employing newly designed large-sized door.


Through the web application, a variety of search parameters are available to quickly find information about specific machines based on key factors. Moreover, KOMTRAX finds out machines with problems from your fleet and shows you through an optimal interface.

Large vertical pin and steel bushing

A large vertical pin and steel bushing are used at the boom foot for improved durability. An abrasion-resistant steel bushing further improves service life.

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