• 84,955 lbs Operating Weight
  • 353 @1900 rpm Horsepower
  • 5.25 yd¬≥ Bucket Capacity

WA500-7 Steel Mill

The Komatsu-integrated design found in this loader offers class leading value, reliability and versatility. Hydraulics, power train, frame and all other major components are engineered by Komatsu. You get a machine whose components are designed to work together for higher production and reliability. The integrated design also provides the strong frame and component foundation to allow a 2nd or even 3rd life after rebuilding. Now add the Komatsu designed Steel Mill Arrangement with guarding and heat protection specifically matched to the WA500-7 and you have a loader that handles hot slag and stays working longer for increased productivity.


Main Wiring Harness

Stainless steel braided sleeves cover the FIRESLEEVE wrapped hoses and main wiring harness passing through the articulation area.

Bucket Pin Hoses

Remote bucket pin grease hoses have been added for easy maintenance and are protected with stainless steel braided sleeve over FIRESLEEVE.

Bellcrank Grease Line

The bellcrank grease line is protected with FIRESLEEVE and stainless steel braided sleeve.

Plastic Replaced With Metal

The plastic on exposed components has been removed or replaced with metal. The standard plastic backed mirrors are replaced with metal backed mirrors.HID bulbs with glass lenses replace the standard plastic lens front work lights.

Steel Steps

The front rubber mounted lower steps are replaced with steel hinged steps that are designed to move fore and aft with the machine to minimize damage from external impact.

Steel Rear Steps

The rear rubber mounted steps are replaced with heavy duty 19mm 3/4" thick steel steps.

Metal Fuel Water Separator Bowl

The plastic fuel filter water separator bowl is replaced with a metal bowl and all rubber fuel lines are protected from heat with FIRESLEEVE wrap.

Ecosafe Hydraulic Fluid

Hydraulic fluid can be replaced with optional EcoSafe FR46 or FR68 fire resistant fluid. A hydraulic tank drain quick coupler and quick sample port are included as standard equipment with the Steel Mill Arrangement

Bolt-on Covers

On the sides of the loader,both the transmission filter box and the brake component box are protected and reinforced with 6.5mm 1/4" guards on the sides and bottom. Bolt on covers allow easy access to maintenance and inspection locations.

Additional Guarding

The 3mm 1/8" cab underguard protects the hoses directly underneath the cab from molten splashes and external damage.

Dual Screen Guards

The dual screen light guards protect the front work lights from impacts.

Optimax Air Intake

At a steel mill there is typically a large amount of dust in the air. The Steel Mill Arrangement includes an optional dual stage Optimax system that will protect and extend the life of the air intake system and filters. In addition to this, the battery boxes are also sealed to prevent dust accumulation.

Upgraded Axle Breathers

The axle breathers feature upgraded filter media designed for this application and are raised off the axle.

Optional Dual Pane Front Glass

The optional dual pane sacrificial glass protects the front of the cab from heat and impact. The inner glass is 22mm 7/8"thick SAFE-SHIELD, and the outer glass is 5.5mm 7/32" thick HEAT-SHIELD.The roof of the cab comes prewired for installation of a beacon light.

Engine Shut Down Switch

At the rear of the loader there is an engine shutdown switch and a parking brake override switch accessible from ground level. Both switches are designed to be used in urgent situations for towing the machine.

Transmission Override

Should damage occur to the transmission shift system, an additional secondary override circuit is included in the cab. This circuit allows travel in first gear forward or reverse to move the machine from a compromising location.

Fire Suppression Switch

A bracket is provided in the cab to easily mount a manual activation switch and control box for a fire suppression system.Also, the left and right platforms have added mounting plates for liquid/dry chemical tanks.

Cab Filtration

The optional RESPA cab air filtration system provides pre cleaned,filtered air to the HVAC system and pressurizes the cab keeping odors out and extending HVAC filter life. The custom fit RESPA system is designed to withstand the heat of a typical slag application.The filter box at the top of the cab is guarded to deflect heat while maintaining easy access for service.

Electrical Cables

High amperage cables connecting the two batteries, the batteries to starter and the alternator to batteries are wrapped with FIRESLEEVE. HD clamps replace standard clamps as necessary.


The guarding package protects the:

    (1) front frame bottom opening

    (2) boom cylinder hoses

    (3) power train bottom opening

    (4) fuel tank

    (5) front and rear axle brake lines


The guards are up to 9.5mm 3/8" thick steel and are protected with bolt head guards as needed. The front frame, power train and fuel tank guards have bolt on covers to allow cleanout and access to maintenance points.

Hydraulic Hoses

FIRESLEEVE covers the external boom and bucket hoses and all exposed wire harnesses in the front frame and the front portion of the rear frame. HD clamps replace standard clamps as necessary. Stainless steel braided sleeves protect the FIRESLEEVE wrapped hoses and harness from damage.

FIRESLEEVE is used to protect the hydraulic hoses and wire harnesses susceptible to damage in this severe application. FIRESLEEVE, a high temperature silicone rubber coated fiberglass sleeve, withstands 260°C 500°F continuous exposure; molten splash at 1205°C 2200°F for periods up to 15 minutes and short exposures up to 1650°C 3000°F.


Axles and Final Drives

Drive system Four-wheel drive
Front Fixed, semi-floating
Rear Center-pin support, semi-floating, 24° total oscillation
Reduction gear Spiral bevel gear
Differential gear Conventional type
Final reduction gear Planetary gear, single reduction


Service brakes Hydraulically actuated, wet disc brakes actuate on four wheels
Parking brake Wet disc brake
Emergency brake Parking brake is commonly used


Model Komatsu SAA6D140E-6*
Type Water-cooled, 4-cycle
Aspiration Turbo-charged, after-cooled, cooled EGR
Number of cylinders 6
Bore x Stroke 5.51" x 6.50" 140 mm x 165 mm
Piston displacement 930 in³ 15.24 ltr
Govenor All-speed, electronic
SAE J1995 - Gross 357 HP 266 kW
ISO 9249 / SAE J1349 - Net 353 HP 263 kW
Rated rpm 1900 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 Interim and EU stage 3B emissions certified

Hydraulic System

Steering system:
Hydraulic pump Piston pump
Capacity at rated rpm 31.7 U.S. gal/min 120 ltr/min
Relief valve setting 3,555 psi 24.5 MPa / 250 kgf/cm²
Hydraulic cylinders:
Type Double-acting, piston type.
Number of cylinders 2
Bore x stroke 3.9" x 19.1" 100 mm x 486 mm
Loader control:
Hydraulic pump Piston pump
Capacity at rated rpm 84.8 U.S gal/min 320 ltr/min
Relief valve setting 4,980 psi 34.3 MPa / 350 kgf/cm²
Hydraulic cylinders:
Type Double-acting, piston type.
Number of cylinders: Bore x Stroke: Bore x Stroke:
Boom cylinder / 2 6.3" x 35.4" 160 mm x 898 mm
Bucket cylinder / 1 7.3" x 26.6" 185 mm x 675 mm
Control valve 2-spool type
Control positions:
Boom Raise, hold, lower, and float
Bucket Tilt-back, hold, and dump
Hydraulic cycle time (rated load in bucket):
Raise 7.2 sec
Dump 1.7 sec
Lower (Empty) 4.2 sec

Service Refill Capacities

Cooling system 35.1 U.S. gal 133 ltr
Fuel tank 124.9 U.S. gal 473 ltr
Engine 9.8 U.S. gal 37 ltr
Hydraulic system 89.0 U.S. gal 337 ltr
Axle (each front and rear) 25.1 U.S. gal 95 ltr
Torque converter and transmission 18.8 U.S. gal 71 ltr

Steering System

Type Articulated type, fully-hydraulic power steering
Steering angle 36° (40° to max end stop)
Minimum turning radius at the center of outside tire 23' 2" 7050 mm


Torque converter 3-elements, 1-stage, 2-phase
Transmission Full-powershift, planetary type
Travel speed: (Measured with 23.5-25 tires) Forward Reverse
1st gear 4.7 mph
7.5 km/h
5.3 mph
8.5 km/h
2nd gear 8.0 mph
12.9 km/h
8.0 mph
12.9 km/h
2nd gear (Lock-up clutch ON) 8.1 mph
13.1 km/h
8.1 mph
13.0 km/h
3rd gear 13.8 mph
22.2 km/h
15.3 mph
24.7 km/h
3rd gear (Lock-up clutch ON) 14.7 mph
23.7 km/h
16.5 mph
26.6 km/h
4th gear 22.1 mph
35.5 km/h
23.6 mph
38.0 km/h
4th gear (Lock-up clutch ON) 23.2 mph
37.3 km/h
23.6 mph
38.0 km/h


  • 2-spool valve for boom and bucket control
  • Alternator, 90 A
  • Auto shift transmission with mode select system
  • Automatic hydraulic-driven fan with automatic reverse rotation
  • Back-up alarm
  • Batteries, 160 Ah/12 V (2)
  • Battery disconnect
  • Boom Kick-out, in-cab adjustable
  • Bucket Positioner, in-cab adjustable, 3 positions
  • Color rear view camera and monitor
  • Counterweight, standard and additional
  • Electronically Controlled Suspension System (ECSS)
  • Engine, Komatsu SAA6D140E-6 diesel
  • Engine shut-off system, electric
  • EPC fingertip controls with F-N-R switch, two levers
  • Equipment Management Monitoring System (EMMS)
  • --Lights (central warning, brake oil pressure, engine oil pressure, parking brake, cooling fan reverse, KDPF restriction, seat belt caution, Komtrax message)
  • --Gauges (Engine water temperature, ECO, Fuel level, Hydraulic oil temperature, speedometer/tachometer)
  • Front fenders
  • Fuel pre-filter with water separator
  • Horn, electric
  • Komatsu SmartLoader Logic
  • Komatsu Auto Idle Shutdown
  • KOMTRAX® Level 4
  • Lift cylinders and bucket cylinder
  • Lights
  • --Back-up light, LED
  • --Stop and tail light, LED
  • --Turn signal, 2 rear with hazard switch
  • --Working lights, halogen, 2 front cab mount
  • --Working lights, halogen, 2 front fender mount
  • --Working lights, halogen, 2 rear grill mount
  • Loader linkage with standard lift arm
  • Lock-up torque converter
  • Parking brake, electric
  • Radiator, wider core
  • Radiator mask, lattice type
  • Rear view mirrors, outside (2) inside (2)
  • Rims for 29.5-25 tires
  • ROPS/FOPS Cab Level 2
  • --2 x DC12V electrical outlets
  • --Auto air conditioner
  • --Cigarette lighter, 24V
  • --Color LCD/TFT multi-monitor
  • --Cup holder
  • --Floor mat
  • --Operator seat, reclining, air suspension type, heated
  • --Radio, AM/FM with AUX input jack
  • --Rear defroster, electric
  • --Seatbelt, 2-point retractable, 76mm / 3” width
  • --Space for Lunch box
  • --Steering wheel, tilt and telescopic
  • --Sun visor, front window
  • --Windshield washer and wiper, front with intermittent
  • --Windshield washer and wiper, rear
  • Service brakes, wet disc type
  • Starting motor, 11 kW
  • Transmission, 4 forward and 4 reverse
  • Vandalism protection kit, padlocks for battery (2)

Steel Mill Arrangement Standard Equipment

  • HID front work lights (ILOS)
  • Beacon wiring harness
  • Cab under guard
  • Emergency engine shut down at ground level
  • Fire suppressant system ready
  • FIRESLEEVE covered exposed hoses
  • FIRESLEEVE covered exposed wire harnesses
  • Front light guards
  • Guarding package for brake component box, transmission filter box, front frame, power train, fuel tank, boom cylinder hoses, and front and rear axle brake lines
  • Hydraulic oil quick sample port
  • Hydraulic tank drain quick coupler
  • Sealed battery box
  • Metal backed mirrors (ILOS)
  • Metal fuel filter water separator bowl (ILOS)
  • Raised axle breathers (ILOS)
  • Remote parking brake override at ground level
  • Remote bucket pin grease hoses
  • Steel front and rear steps
  • Stainless steel braided sleeve hose guards
  • Transmission override in cab 


  • Auxiliary steering (SAE)
  • Limited slip differential (F&R)
  • EcoSafe FR46 hydraulic fluid
  • EcoSafe FR68 hydraulic fluid
  • Sy-Klone Optimax dual stage pre-cleaner
  • Sy-Klone RESPA cab air cleaner
  • Sacrificial glass