• 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.


New Productivity and Efficiency Features

  • Variable Traction Control System optimizes rim pull for various ground conditions, minimizing tire slippage and reducing maintenance costs
  • Modulation Clutch gives operators precise control of rim pull, allows for fast work equipment speeds and a smooth approach when loading trucks
  • A new Closed-Center, Load Sensing Hydraulic System (CLSS) keeps hydraulic oil cool, work equipment speed quick, and reduces fuel consumption
  • Throttle Lock improves cycle times by maintaining high work-equipment performance and saves fuel with auto-deceleration
  • 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

New Operator's Environment

  • Large, ROPS/FOPS certified operator's cab with trainer seat provides a full view of the 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 guardrails 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

Reliability and Durability

  • Increased overhaul intervals on transmission and axles reduce the Total Cost of Ownership (TCO)
  • New loader linkage design with increased arm plate width for structural durability in the most challenging digging applications
  • Standard brake cooling and redesigned wet, multi-disk service brakes extend service intervals and require fewer service hours to complete planned maintenance
  • Standard engine pre-lubrication system ensures full lubrication upon startup to minimize unnecessary engine wear

New Machine Technology

  • Large 7" LCD color machine monitoring panel with integrated load meter
  • Advanced machine monitoring system with onboard diagnostics, no laptop required
  • KomVision with radar obstacle detection provides a bird’s eye view utilizing a 6-camera system and dedicated display (optional)
  • KOMTRAX Plus, for near-real time remote diagnostics of machine health and performance
  • Energy saving operation and ecology guidance provides operator with recommendations to improve operational efficiency and fuel economy
  • Automatic Dig, Semi-auto approach, and Semi-auto dump features automate work equipment control throughout a v-cycle to reduce operator fatigue while maintaining high levels of productivity



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 34.3 MPa 350 kgf/cm2 4,975 psi
Hydraulic cylinders:    
Double-acting, piston type
    Number of cylinders
    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 4,975 psi
Hydraulic cylinders:    
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:    
Raise, hold, lower, and float
Tilt-back, hold, and dump
Hydraulic cycle time (rated load in bucket)    
10.1 s
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



  • Air Cleaner, Double Element with Dust Indicator and Evacuator
  • Engine, KOMATSU SAA12V140E-7, 12 Cylinder, Turbocharged, After Cooled, Diesel
    Gross HP: 900HP (672kW) / 2050 RPM (SAE J1995)
    Net HP: 899 HP (671kW) / 2050 RPM (ISO 9249 / SAEJ1349)
  • Engine Pre-lubrication System
  • Exhaust Pipe Glasswooled with 2 x KDPF/KDOC
  • Fuel Pre-Filter with Water Separator
  • Hydraulic Cooling Fan, Reversible, Swing Out
  • Radiator, Modular Core, Swing Out Lattice Type Mask


  • Access Stair Lamps, (1 RH & 2 LH)
  • Alternator, 24V (140 Ampere)
  • Back-up Alarm
  • Back-up Lights, Rear, LED
  • Batteries, 4 x 12V, (160Ah)
  • Beacon, Amber Color
  • Circuit Breaker
  • Emergency Stop Switches, Ground Level (RH & LH)
  • Heavy Duty Wiring Harness
  • Horn, Electric
  • Instrument Monitor Panel, Multi Color Display
  • Secondary Shutdown Switch, Engine, Cab Mounted
  • Starting Motors, 11kW / 2 x 24V, Direct Electric
  • Stop and Tail Lights, LED
  • Turn Signals, (2 Front, 2 Rear) with Hazard Switch, LED
  • Work Lamps, LED, 22:
    6 Front Work Lamps (3 RH & 3 LH)
    6 Rear Work Lamps (3 RH & 3 LH)
    4 Side Work Lamps (2 RH & 2 LH)
    2 Axle Mounted Work Lamps (Front)
    4 Cab Mounted Work Lamps (2 Front & 2 Rear)


  • 3rd gear prohibition and speed limit control
  • Brake Cooling
  • Brake, Parking, Wet Multiple Disc, SAHR
  • Brakes, Service, Wet Multiple Disc, Sun Gear
  • Powertrain Underguard
  • Secondary Steering (ISO 5010)
  • Steering, Advanced Joystick Steering System (AJSS)
  • Transmission, 3-speed Planetary Automatic Powershift Modulation Clutch Kickdown, Automatic and Manual Control
  • Throttle Lock with Auto Deceleration
  • Variable Traction Control System


  • 45 Degree Stairways (LH & RH)
  • Access Ladder (LH & RH)
  • Cab, Steel, LH Entrance, ROPS/FOPS (ISO 3471/ISO 3449) 2 x DC12V Outlets, Auto Air Conditioner, Heater, Defroster (Front & Rear), Blinds, Front & Rear with Roll Curtains,Ecology Guidance, Ecology Gauge Lever, Machine Lockout
  • Main Monitor - Multi Color Electronic Display Onboard Diagnostics
  • Power Windows
  • Radio, AM/FM with Bluetooth
  • Rearview Mirrors, RH & LH, Heated
  • Rearview Camera Monitoring System (Dedicated Monitor)
  • Room/Spot Lamps, LED
  • Seat, Air Suspension, Reclining, Heated / Ventilated
  • Seat Belt, 3" Retractable, Lap Belt with Detachable Shoulder Harness
  • Secondary Door, RH
  • Sunvisor
  • Trainer Seat with Retractable Lap Belt
  • Wiper/Washer Front (Intermittent), Side, Rear (Intermittent)


  • Anchor Points, Tie Off Type
  • Battery Isolator, Lockable
  • Engine Bay Lamps, LED
  • Fast Fuel System
  • Ground Level Service Center: Grease Gauge, Indicator Lamp, Refill Port, Centralized KOWA Sampling Fluids Ports, Transmission, Hydraulic & Engine Oil, Torque Converter & Engine Coolant
  • Jump Start Receptacle
  • Machine Immobilization Switch, Lockable
  • Starter Isolator, Lockable)


  • 2-spool Valve for Boom and Bucket with Electronic Pilot Controls
  • Automatic Digging System
  • Boom Positioner with Kick-Out
  • Bucket Positioner with Kick-Out
  • Electronically Controlled Suspension System (ECSS)
  • Inline Filters, Steering and Hydraulic
  • Semi-Auto Approach and Dump System
  • Wall Digging Protection Control
  • Work Equipment Shock Reduction Control


  • Auto Idle Shutdown
  • Auto-Lubrication System
  • Front Fenders (LH & RH)
  • Komatsu SmartLoader Logic
  • KOMTRAX Plus
  • Load Meter System
  • Platform, Counterweight with Handrails
  • Platform, Front with Handrails
  • Rims for 45/65-45 Tires
  • Tow Hitch


  • Battery Box Lock
  • Cap Lock & Cover for Fuel Tank
  • Radiator, Filler Lock and Cover


  • 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)