• Engine

    Model Komatsu SAA6D170E-5
    Type Four-cycle, water-cooled, direct injection
    Aspiration Turbo-charged, after-cooled, cooled EGR
    Number of cylinders 6
    Bore x stroke 170 mm x 170 mm
    Displacement 23.15 ltr
    Horsepower, Gross - SAE J1995 474 kW / 636 HP
    Horsepower, Net - ISO 9249 / SAE J1349 455 kW / 610 HP
    Rated RPM 1800
    Fan drive method Hydraulic
  • Coolant & Lubricant Capacity

    Fuel tank 1200 ltr
    Coolant 120 ltr
    Engine 86 ltr
    Torque converter, transmission, bevel gear, and steering system 150 ltr
    Final drive (each side) 65 ltr
  • Final Drive

    Double-reduction final drive of spur and planetary gear sets to increase tractive effort and reduce gear tooth stresses for long final drive life. Segmented sprocket teeth are bolt-on for easy replacement.

  • Hydraulic System

    Hydraulic Control Unit:
    Closed-center load sensing system (CLSS) designed for precise and responsive control, and for efficient simultaneous operation.
    All spool control valves externally mounted beside the hydraulic tank. Variable piston pump with capacity (discharge flow) of 366 ltr/min for implement at rated engine rpm.
    Relief valve setting . . . for implement 27.5 MPa
    280 kg/cm²
    Control Valves:
    Spool control valves for Semi-U tilt dozer and Full-U tilt dozer.
    Blade lift Raise, hold, lower, and float
    Blade tilt Right, hold, and left
    Additional control valve required for variable digging angle multi-shank ripper and giant ripper.
    Ripper lift Raise, hold, and lower
    Ripper tilt Increase, hold, and decrease
    Hydraulic Cylinders:
    Type Double-acting, piston
    Number of blade lift cylinders 2
    Blade lift cylinder bore 140 mm
    Number of blade tilt cylinders 1
    Blade tilt cylinder bore 180 mm
    Number of ripper lift cylinders 2
    Ripper lift cylinder bore 200 mm
    Number of ripper tilt cylinders 2
    Ripper tilt cylinder bore 180 mm
    Hydraulic Oil Capacity (Refill):
    Semi-U dozer or U dozer 130 ltr
    Ripper Equipment (Additional Volume):
    Giant ripper (variable) 45 ltr
    Multi-shank ripper (variable) 45 ltr
  • Operating Weight

    Tractor weight Including rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment. 53200 kg
    Operating weight Including Semi-U tilt dozer, giant ripper, cab, ROPS, operator, standard equipment, rated capacity of lubricant, coolant, and full fuel tank. 71640 kg
    Ground pressure 1.48 kg/cm² / 145 kPa
  • Steering System

    PCCS, joystick controlled, wet multiple-disc steering clutches are spring-loaded and hydraulically released. Wet multiple-disc, pedal/lever controlled steering brakes are spring-actuated hydraulically released and require no adjustment. Steering clutches and brakes are interconnected for easy, responsive steering.

    Minimum turning radius 4.2 m
  • Torqflow Transmission

    Komatsu TORQFLOW transmission consists of a water-cooled, 3-element, 1-stage, 1-phase torque converter with lockup clutch and a planetary gear, multiple-disc clutch transmission which is hydraulically actuated and force-lubricated for optimum heat dissipation. Gearshift lock lever and neutral safety switch help prevent accidental starts.

    Gear Forward Reverse
    1st 3.5 km/h 4.6 km/h
    2nd 6.8 km/h 8.9 km/h
    3rd L 8.0 km/h 9.7 km/h
    3rd 11.8 km/h 15.8 km/h
  • Undercarriage

    Suspension Oscillating equaliser bar and pivot shaft
    Track roller frame Cylindrical, high-tensile-strength steel construction
    Rollers and idlers Lubricated track rollers
    K-Bogie undercarriage Lubricated track rollers are resiliently mounted to the track frame with a bogie suspension system whose oscillating motion is cushioned by rubber pads.
    Extreme service track shoes Lubricated tracks. Unique seals prevent entry of foreign abrasives into pin to bushing clearances to provide extended service life. Track tension is easily adjusted with grease gun.
    Number of shoes (each side) 41
    Grouser Height:
    Single grouser 93 mm
    Shoe width (standard) 610 mm
    Ground contact area 48560 cm2
    Ground pressure (tractor) 108 kPa / 1.10 kg/cm²
    Number of track rollers 8
    Number of carrier rollers 2
    Extreme service shoes: Ground contact area: Ground pressure:

    610 mm

    Additional weight - 0 kg

    48560 cm² 1.48 kg/cm² / 145 kPa

    710 mm

    Additional weight - 680 kg

    56520 cm² 1.28 kg/cm² / 126 kPa

    810 mm

    Additional weight - 1360 kg

    64480 cm² 1.13 kg/cm² / 111 kPa

D375A-8 Dozers

Powered by a new technology Komatsu engine, the D375A-8 sets the industry standard in terms of operator comfort and control, while delivering higher production and lower operating costs for mining and heavy construction applications. As with all our dozers, key components are designed and manufactured by Komatsu to work together in an integrated package. And it comes standard with our KOMTRAX PLUS remote monitoring and location system, backed by our New Zealand-wide service and support network.

  • 455 kW / 610 HP
  • 72,900 kg
  • 22 m³

Auto Downshift Function

Controller monitors engine speed, travel gear and travel sped. When load is applied and machine travel speed is reduced, the transmission automatically downshifts to optimum gear speed to provide high fuel efficiency. This function provides comfortable operation without manual downshift and high productivity.

Automatic Transmission with Lockup Torque Converter

A sharp reduction in fuel consumption and greater power train efficiency is achieved by the new automatic gearshift transmission and lockup torque converter. The automatic gearshift transmission selects the optimal gear range depending on the working conditions and load place on the machine. This means the machine is always operating at maximum efficiency.

K-Bogie Undercarriage System

K-Bogie undercarriage system combines prior advantages with additional features. K-Bogies that oscillate with two fulcrums assure large amount of track roller vertical travel. Impact load to undercarriage components is minimised and durability of components is improved since track rollers are always in contact with track link. 


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