Komatsu WA320-7

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The WA320-7 marries a well proven hydrostatic drivetrain with Komatsu’s industry leading Tier 4 interim engine technology that reduces fuel economy 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.


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    
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    
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
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
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