• 33,731 - 33,984 lbs Operating Weight
  • 165 @2100 rpm Horsepower
  • 3.7 - 4.2 yd¬≥ Bucket Capacity


The WA320-7 marries a well proven hydrostatic drivetrain with Komatsu’s industry leading Tier 4 interim engine technology that reduces fuel consumption by up to 10%. The WA320-7 has a parallel lift boom with 10% more lift than the previous model and z-bar linkage for high breakout force for digging.

WA320-7 Walkaround  >


Auto Reversing Fan

The engine cooling fan is driven hydraulically. It can be set to reverse automatically during operation. Fan reverse mode and timing can be controlled through the monitor.

Creep Mode

Creep mode limits the travel speed while still allowing for full hydraulic flow.

Electronically Controlled Suspension System (ECSS)

The Electronically Controlled Suspension System (ECSS) or ride control system uses an accumulator which absorbs some of the shock in the boom arm, giving the operator a much smoother ride. This reduces operator fatigue and reduces material spillage during load and carry operations. ECSS is speed sensitive, meaning that the boom won’t move during stationary digging. ECSS is standard on the WA320-7.

Full Side-Opening Gull-Wing Engine Doors

The large gull-wing type engine doors are operated with low effort assisted by gas springs. The doors open in two steps for easy access to maintenance points. Large steps and handholds are provided on each side of the frame to help access.

Heated Operator Seat with Air Suspension

A new higher capacity heated, air suspension seat with suspension damper is now standard.The arm rest angle is fully adjustable for optimum operator comfort.

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 prolongs the life of the wet disc brakes.

Komatsu SmartLoader Logic

Wheel loaders have different torque requirements depending on working conditions. KomatsuSmartLoader Logic reads data from various sensors and vehicle controls to precisely control the torque output.This lowers the torque output during less demanding work, saving fuel. And because its seamless to the operator, it operates without decreasing production.

Low Noise Design

Operator’s ear noise level : 70 dB(A)Dynamic noise level (outside): 107 dB(A)The large cab is mounted with Komatsu’sunique ROPS/FOPS viscous mounts. The low-noise engine, hydraulically driven fan,and hydraulic pumps are mounted with rubber cushions, and the cab sealing is designed to provide a quiet, low-vibration,dust proof, and comfortable operating environment.

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.

Rear View Monitoring System (standard)

The operator can view the area directly behind the machine with a full color monitor that is located on the right side of the cab. This monitor can be always on or only on when the loader goes into reverse. Visual guidelines can also be added to show the machine's travel path.

Remote Boom Positioner

The operator can set the upper boom kickout from the cab.

Swing-out Type Cooling Unit

The large capacity cooling unit swings open for cleaning. It features wider spacing of cooling fins to reduce clogging.

Variable Traction Control System

The new variable speed control system is designed to adjust the operating speed 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. Maxtraction 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.
Emergency brake Parking brake is commonly used


Model Komatsu SAA6D107E-2*
Type Water-cooled, 4-cycle
Aspiration Turbo-charged, after-cooled, cooled EGR
Number of cylinders 6
Bore x stroke 4.21" x 4.88" 107 mm x 124 mm
Piston displacement 408 in³ 6.69 ltr
Governor All-speed, electronic
Gross - SAE J1995 170 HP 127 kW
Net - ISO 9249/SAE J1349 165 HP 123 kW
Rated rpm 2100 rpm
Max power - ISO 14396 @ 1900 rpm 173 HP 129 kW
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 Gear type pump
Capacity (at rated rpm) 29.1 U.S. gal/min 110 ltr/min
Relief valve setting 2,700 psi 18.6 MPa
190 kgf/cm²
Hydraulic cylinders:
Type Double-acting, piston type
Number of cylinders 2
Bore x stroke 2.8" x 17.8" 70 mm x 453 mm
Loader control:
Hydraulic pump Gear type pump
Capacity 20.6 U.S. gal/min 78 ltr/min
Relief valve setting 3,000 psi 20.6 MPa
210 kgf/cm²
Hydraulic cylinders:
Type Double-acting, piston type
Number of cylinders bore x stroke bore x stroke
Boom cylinder - 2 5.1" x 28.2" 130 mm x 717 mm
Bucket cylinder - 1 5.9" x 19.3" 150 mm x 491 mm
Control valve 3-spool type
Control positions:
Boom Raise, hold, lower, and float
Bucket Tilt-back, hold, and dump
Hydraulic cycle time (rated load in bucket):
Raise 5.7 sec
Dump 1.6 sec
Lower (Empty) 3.3 sec

Service Refill Capacities

Cooling system 6.1 U.S. gal 23 ltr
Fuel tank 64.7 U.S. gal 245 ltr
Engine 6.1 U.S. gal 23 ltr
Hydraulic system 23.7 U.S. gal 90 ltr
Axle front 7.1 U.S. gal 27 ltr
Axle rear 6.7 U.S. gal 25.5 ltr
Transfer case 1.5 U.S. gal 5.8 ltr

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 17'8" 5380 mm


Transmission Hydrostatic, 1 pump, 2 motors with speed range select
Travel Speed: Forward Reverse
1st 0.6 - 8.1 mph 0.6 - 8.1 mph
2nd 8.1 mph 8.1 mph
3rd 11.6 mph 11.6 mph
4th 23.6 mph 23.6 mph
Measured with 20.5-25 tires


  • 2-spool valve for boom and bucket control
  • Alternator, 60 A
  • Auto shift transmission with mode select system
  • 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 (ECSS)
  • Engine, Komatsu SAA6D107E-2 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 (Engine water temperature, ECO, 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 4
  • 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 with 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
  • --Ashtray
  • --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)


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