• 34,128 - 34,987 lbs Operating Weight
  • 165 @2100 rpm Horsepower
  • 3 - 4.2 yd¬≥ Bucket Capacity


The WA320-8’s parallel-lift linkage, with auto tilt-in to simulate a Z-bar, can be used in virtually any application from pallet handling to hard digging. The fourth generation Hydrostatic Transmission (HST), found in this Tier 4 Final compliant machine, helps prolong brake life, thanks to dynamic braking, while S-Mode gives the operator maximum control in slippery conditions. This latest addition to the wheel loader family combines high production, improved operator comfort and reduces fuel consumption by up to three percent compared to the WA320-7.

WA320-8 Walkaround  >


Creep Mode

Creep mode limits the travel speed in 1st speed range, while still allowing for full hydraulic flow.

New Operator Seat

A new standard, heated, air-suspension seat provides enhanced support on rough roads and dampens machine vibrations, providing a more comfortable ride for the operator. The angle of the armrest is fully adjustable for optimum operator comfort. A secondary F-N-R switch is incorporated into the standard multi-function mono lever.

Heavy-duty After Treatment System

This new system combines a Komatsu Diesel Particulate Filter (KDPF) and Selective Catalytic Reduction (SCR). The SCR NOx reduction system injects the precise amount of Diesel Exhaust Fluid (DEF) to break down NOx into non-toxic water vapor (H2O) and nitrogen gas (N2).

Hydrostatic Transmission

The HST provides quick travel response and aggressive drive into the pile. Full auto-shifting eliminates any gear shifting and kick-down operation to allow the operator to concentrate on the digging and loading. The HST also acts as a dynamic brake to slow the loader. This dramatically extends the life of the wet disc brakes.

Multi-Function Mono Lever

The multi-function mono lever with EPC control for 3rd spool is standard. It includes a forward-neutral-reverse switch for quick and easy travel. Third spool attachments can be set to continual or proportional control via the monitor panel allowing the operator to control the boom, bucket and attachment all with a single lever.

Standard Rear View Monitoring System

The dedicated full-color monitor on the right side of the cab provides the operator with a rear view from the machine. This monitor can be always on or only on when the loader shifts into reverse. Guidelines provide the operator with visual cues for the width of the loader.

Variable Traction Control System

The variable traction control system is designed to adjust the traction control for each working condition. S-mode reduces tire spin in slippery or snowy conditions. Auto-mode automatically optimizes the tractive effort for various working conditions. Max traction provides the full, 100%, tractive effort.


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 Torque proportioning
Final reduction gear Planetary gear, single reduction


Service brakes Hydraulically-actuated, wet disc brakes actuate on four wheels.
Parking brake Wet, multi-disc brake on transfer output shaft.
Secondary brake Parking brake is commonly used


Model Komatsu SAA6D107E-3*
Type Water-cooled, 4-cycle
Aspiration Komatsu variable geometry turbo-charged, after-cooled, cooled EGR
Number of cylinders 6
Bore x stroke 107 mm x 124 mm 4.21" x 4.88"
Piston displacement 6.69 ltr 408 in³
Governor All-speed, electronic
SAE J1995 - Gross
127 kW 170 HP
ISO 9249 / SAE J1349 - Net
123 kW 165 HP
Rated rpm 2100 rpm
Max power - ISO 14396 @ 1900 rpm 126 kW 169 HP
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

Hydraulic System

Steering system:
Hydraulic pump Piston pump, in common
with loader control
Capacity (at rated rpm) 180 ltr/min 47.6 U.S. gal/min
Relief valve setting 20.6 MPa
210 kgf/cm²
3,000 psi
Hydraulic cylinders:
Type Double-acting, piston type
Number of cylinders 2
Bore x stroke 70 mm x 453 mm 2.76" x 17.8"
Loader control:
Hydraulic pump Piston pump, in common
with steering system
Capacity 180 ltr/min 47.6 U.S gal/min
Relief valve setting 30.4 MPa
310 kgf/cm2
4,410 psi
Hydraulic cylinders:
Type Double-acting, piston type
Number of cylinders bore x stroke bore x stroke
Lift cylinder - 2 120 mm x 729 mm
4.7" x 28.7"
Bucket cylinder - 1 150 mm x 558 mm 5.9" x 22"
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 6.3 sec
Dump 1.9 sec
Lower (Empty) 3.5 sec

Service Refill Capacities

Cooling system 35.1 ltr 9.3 U.S. gal
Fuel tank 245 ltr 64.7 U.S. gal
Engine 23 ltr 6.1 U.S. gal
Hydraulic system 92 ltr 24.3 U.S. gal
Axle front 27 ltr 7.1 U.S. gal
Axle rear 25.5 ltr 6.7 U.S. gal
Transfer case 5.8 ltr 1.5 U.S. gal
DEF tank 14 ltr 3.7 U.S. gal

Steering System

Type Articulated type, fully-hydraulic power steering
Steering angle 38.5° each direction (40° to max end stop)
Minimum turning radius
at the center of outside tire
5380 mm 17'8"


Hydrostatic, 1 pump, 2 motors with speed range select
Travel Speed: Forward Reverse
1st 1.0 - 13.0 km/h
0.6 - 8.1 mph

1.0 - 13.0 km/h
0.6 - 8.1 mph

2nd 13.0 km/h
8.1 mph
13.0 km/h
8.1 mph
3rd 18.7 km/h
11.6 mph
18.7 km/h
11.6 mph
4th 38.0 km/h
23.6 mph
38.0 km/h
23.6 mph

Measured with 20.5-R25 tires


  • 2-spool valve for boom and bucket control
  • Alternator, 24 V/ 90 A
  • Automatic hydraulic-driven fan with automatic reverse rotation
  • Back-up alarm
  • Batteries, 92 Ah/12V (2), 680 CCA
  • Battery disconnect
  • Boom kick-out, in-cab adjustable
  • Bucket positioner
  • Color, rear-view camera and monitor
  • Counterweight, standard and additional
  • Electronically Controlled Suspension System
  • Engine, Komatsu SAA6D107E-3 diesel
  • Engine shut-off system, electric
  • 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 (DEF level, Engine water temperature, ecology, Fuel level, HST oil temperature, speedometer/tachometer), variable speed display
  • Front fenders
  • Fuel pre-filter with water separator
  • Horn, electric
  • Hydrostatic transmission
  • Komatsu SmartLoader Logic
  • Komatsu Auto Idle Shutdown
  • KOMTRAX® Level 5
  • Lift cylinders and bucket cylinder
  • Lights
    --Back-up light

    --Stop and tail light

    --Turn signal lamps, 2 front and 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
  • Multifunction mono-lever loader control transmission F/R switch
  • Parking brake, electric
  • Radiator, wider core
  • Radiator mask, swing up
  • Rear view mirrors, outside (2) inside (2)
  • Rims for 20.5-R25 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, 5.5 kW
  • Transmission speed ranges, 4 forward and 4 reverse
  • Vandalism protection kit, padlocks for battery box (2)


  • Auxiliary steering (SAE)
  • Cutting edge (bolt-on type)
  • Engine oil and coolant heater
  • Guarding package
  • Limited slip differential (F&R)
  • Lube system
  • Quick coupler
  • Rear full fenders
  • Three-spool valve (will utilize integrated proportional control switch included in the multi-function mono-lever) and piping
  • Various tire options, radial and bias
  • Various bucket options