• 256,618 lbs Operating Weight
  • 899 @2050 rpm Horsepower
  • 15 - 19 yd¬≥ Bucket Capacity


The WA900-8 is high production quarry and mining wheel loader. Designed for loading 70 to 150-ton haul trucks, the WA900-8 can be configured for a variety of applications to meet customer needs. A throttle lock and modulation clutch enable operators to quickly load trucks while Komatsu SmartLoader Logic and a closed center load sensing hydraulic system reduce fuel consumption. The z-bar linkage gives the WA900-8 best in class breakout force for even the toughest digging applications. Optional KomVision with Radar Obstacle Detection provides the operator with a bird’s eye view of the working area on a dedicated monitor.


Productivity and Efficiency Features

  • Variable Traction Control System optimizes rim pull for all ground conditions, minimizing tire slippage and reducing maintenance costs
  • Modulation Clutch System gives operators precise control of rim pull, allows for fast work equipment speeds and a smooth approach when loading trucks
  • Closed Center Load Sensing Hydraulic System (CLSS) keeps hydraulic oil cool, work equipment speed quick, and provides better fuel economy
  • Throttle Lock improves cycle times by maintaining high work-equipment performance and saves fuel with auto-deceleration
  • Automatic dig, semi-automatic approach, and automatic dump systems can be enabled to reduce operator fatigue in v-cycle applications
  • Komatsu SmartLoader Logic helps reduce fuel consumption without compromising production
  • All new Komatsu bucket design, with modified profile to maximize bucket fill factor and increase productivity

Reliability and Durability

  • Increased overhaul intervals on transmissions and axles reduce maintenance cost and Total Cost of Ownership (TCO)
  • New loader linkage design with increased arm plate width for maximum structural durability
  • Standard brake cooling and redesigned wet, multi-disk service brakes extend service intervals and reduce maintenance hours
  • Standard engine pre-lubrication system ensures full lubrication upon startup

Machine Technology

  • Advanced machine monitoring system with onboard diagnostics, no laptop required
  • KomVision with radar obstacle detection provides a bird’s eye view utilizing 6-camera system and dedicated display (optional)
  • KOMTRAX Plus, for immediate remote diagnostics of machine health and performance
  • Energy saving operation ecology guidance provides operator with real time recommendations to improve operational efficiency and fuel economy

Operator Focused Environment

  • Large, pillarless cab with trainer seat allows full view of working area
  • 45 degree power staircase (optional) and 45 degree walkways on left and right side of machine for convenient access to the cab
  • Catwalks and handrails on the counterweight and in front of the cab allow for easy maintenance
  • Work equipment shock reduction control (4 settings – off, low, middle, high)
  • Higher capacity air suspension seat (heated and ventilated)
  • LED external and internal lighting
  • Anchored tie off points (ISO 14567) located around the machine provide technicians locations to attach service lanyards
  • Electronically Controlled Suspension System (ECSS) provides a smooth ride for better travel performance, reducing operator fatigue and material spillage during operation



Model Komatsu SAA12V140E-7*
Type Water-cooled, 4 cycle
Aspiration Turbo-charged, after-cooled, cooled EGR
Number of cylinders 12
Bore x stroke 140 mm x 165 mm 5.51'' x 6.50''
Piston displacement 30.48 ltr 1,860 in³
Governor all-speed, electronic
Flywheel horsepower
    SAE J1995 - Gross 672 kW 900 HP
    ISO 9249/SAE J1349 - Net 671 kW 899 HP
    Rated rpm 2050 rpm
Fan drive method for radiator cooling Hydraulic
Fuel system Direct injection
Lubrication system
    Method Gear pump, force-lubrication
    Filter Full-flow type
Air cleaner Dry type with double elements and dust evacuator, plus dust indicator
*EPA Tier 4 Final emissions certified


Torque converter: Three-elements, one-stage, one-phase

Transmission: Full-powershift, planetary type

Travel Speed*
1st Forward 7.6 km/h 4.7 mph
1st Reverse 7.9 km/h 4.9 mph
2nd Forward 11.9 km/h 7.7 mph
2nd Reverse 12.1 km/h 7.5 mph
3rd Forward 23.3 km/h 14.5 mph
3rd Reverse 24.1 km/h 15.0 mph
Measured with 45/65-R45 tires

Axles and Final Drives

Drive system Four-wheel drive
Front Fixed, full-floating
Rear Center-pin support, full-floating, 20° total oscillation
Reduction gear Spiral bevel gear
Differential gear Conventional type
Final reduction gear Planetary gear, single reduction


Service brakes Hydraulically actuated, wet multiple-disc brakes actuate on four wheels
Parking brake Wet multiple-disc brake

Steering System

Type Articulated type, fully-hydraulic power steering
Steering angle 40° each direction
Minimum turning radius at
the center of outside tire
9880 mm 32' 5"

Hydraulic System

Steering system:
Hydraulic pump Piston pump
Capacity / at rated rpm 2 x 220 ltr/min 2 x 58.1 U.S. gal/min
Relief valve setting 31.4 MPa 320 kgf/cm2 4,551 psi
Hydraulic cylinders:    
    Type Double-acting, piston type
    Number of cylinders 2
    Bore x stroke 160 mm x 576 mm 6.3" x 22.7"
Work Equipment control:
Hydraulic pump Piston pump
Capacity / at rated rpm 4 x 230 ltr/min 4 x 60.8 U.S gal/min
Relief valve setting 34.3 MPa / 350 kgf/cm² 4,980 psi
Hydraulic cylinders:    
    Type Double-acting, piston type
    Number of cylinders—bore x stroke:
        Boom cylinder - 2 260 mm x 1495 mm 10.2" x 58.9"
        Bucket cylinder - 1 300 mm x 995 mm 11.8" x 39.2"
Control valve Spool type
Control positions:    
    Boom Raise, hold, lower, and float
    Bucket Tilt-back, hold, and dump
Hydraulic cycle time (rated load in bucket)    
    Raise 10.1 s
    Dump 2.9 s
    Lower (Empty) 4.8 s

Service Refill Capacities

Cooling system 370 ltr 97.7 U.S. gal
Fuel tank 1555 ltr 410.8 U.S. gal
Engine 120 ltr 31.7 U.S. gal
Hydraulic system 1020 ltr 269.5 U.S. gal
Axle (each front and rear) 370 ltr 97.7 U.S. gal
Torque converter and transmission 180 ltr 47.6 U.S. gal



  • 2 x KDPF/KDOC
  • Air cleaner, double element with dust indicator
  • Alternator, 24 V/140 A
  • Batteries, large capacity, 4 x 12 V/160 Ah
  • Engine, Komatsu SAA12V140E-7
  • Engine pre-lubrication
  • Starting motor, 2 x 24 V/11 kW


  • 2 x DC12V electrical outlets
  • Advanced joystick steering system
  • Auto air conditioner
  • AM/FM radio with BlueTooth
  • Ashtray
  • Cigarette lighter
  • Cup holder
  • Electronic Pilot Control fingertip control
  • Floor mat
  • Front wiper (with washer and intermittent)
  • Heated mirrors (for cold district)
  • Multi-color monitor
  • Operator seat with 3-point seat belt, reclining, air suspension, heated, ventilated
  • Rear defroster (electric)
  • Rear wiper (with washer and intermittent)
  • Room mirror
  • Room lamps, LED
  • ROPS/FOPS (ISO 3471/ISO 3449)
  • Space for lunch box
  • Spot lamp, LED
  • Steel cab included front, rear and side wiper with windshield washer
  • Sun shades (front and rear), retractable type
  • Sun visor (front)
  • Trainer seat with 2-point seat belt


  • Access stair lamp, LH side, LED
  • Beacon lamp
  • Cab mounted work lamps, LED
  • Engine bay lamp, LED
  • Front work lamps, LED
  • Rear work lamps, LED
  • Side work lamps, LED
  • Stop and tail lamps, LED
  • Turn signal lamps, LED


  • 2 x Emergency stop switches (ground level)
  • Anchorage points (ISO 14567)
  • Back-up alarm
  • Engine shutdown secondary switch (in cab)
  • Handrails for platform
  • Horn, electric
  • Machine lock out system
  • Parking brake, electric
  • Rearview monitoring system
  • Secondary brake
  • Secondary steering (ISO 5010)
  • Service brakes, wet disc type


  • 2-way engine power mode
  • 3rd gear prohibition and speed limit control
  • Automatic digging system
  • Auto greasing system
  • Automatic shift transmission
  • Battery disconnect switch
  • Boom positioner with kick-out
  • Brake cooling system
  • Brake oil thermometer display
  • Bucket positioner
  • Circuit breaker
  • Counterweight
  • Ecology guidance, Ecology gauge
  • Electronically controlled suspension system
  • Engine RPM set system with auto deceleration
  • Engine starter disconnect switch
  • Front fenders
  • Fuel pre-filter with water separator
  • Ground level service center for auto greasing system, oil samples, and machine fluid ports
  • Hydraulic-driven fan with reverse rotation
  • Inline filters, steering and hydraulic
  • Komatsu auto idle shutdown
  • Komatsu SmartLoader Logic
  • KOMTRAX Plus®
  • KOWA sampling port
  • Lift cylinders and bucket cylinder
  • Load meter system
  • Modulation clutch
  • Modular radiator core
  • Power train guard
  • Quick coupling for fuel tank
  • Radiator mask, swing out
  • Rear access stair with handrail
  • Rims for 45/65R (L-5) tires
  • Semi-auto approach & dump system
  • Starter receptacle
  • Tire slip control
  • Tool kit
  • Wall digging protection control
  • Work equipment shock reduction control


  • 15.0 yd3 bucket
  • 17.0 yd3 bucket
  • 19.0 yd3 bucket
  • 45/65R45 (L-5) tubeless tires
  • 45 deg Power Staircase
  • Cold weather field kit (electric heaters for hydraulic oil, transmission oil, engine oil, and coolant)
  • High lift boom
  • KomVision (with radar obstacle detection)