Komatsu WA270-7

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Features

The Komatsu Tier 4 interim technology on the WA270-7 is designed to keep the operator working rather than having to stop and regenerate while saving up to 10% on fuel burned. The hydrostatic drive system on the WA270-7 gives the operator quick and powerful response, self-braking effect of dynamic braking and traction control. A multi-function mono-lever, rearview camera system with separate screen and heated, air ride suspension seat give the operator a comfortable and ergonomic work environment.

Specifications

Engine    
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
Horsepower:    
Gross - SAE J1995 153 HP 115 kW
Net - ISO 9249/SAE J1349 149 HP 111 kW 149 HP
Rated rpm   2000 rpm
Max power - ISO 14396 @ 1900 rpm 150 HP 112 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
Transmission    
     
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 11.8 mph 11.8 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, 20° total oscillation  
Reduction gear Spiral bevel gear  
Differential gear Torque proportioning  
Final reduction gear Planetary gear, single reduction  
Brakes    
     
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° each direction (40° to max end stop)
Minimum turning radius at the center of outside tire 17' 0" 5175 mm
Hydraulic System    
     
Steering system:    
Hydraulic pump   Piston pump, in common with loader control
Capacity (at rated rpm) 39.6 U.S. gal/min 150 ltr/min
Relief valve setting 3,000 psi 20.6 MPa 210 kgf/cm²
Hydraulic cylinders:    
Type   Double-acting, piston type
Number of cylinders   2
Bore x stroke 2.76" x 17.8" 70 mm x 453 mm
Loader control:    
Hydraulic pump   Piston pump, in common with steering system
Capacity (at rated rpm) 39.6 U.S. gal/min 150 ltr/min
Relief valve setting 4,555 psi 320 kg/cm² 
31.4 MPa    
Hydraulic cylinders:    
Type   Double-acting, piston type
Number of cylinders: bore x stroke: bore x stroke:
Boom cylinder / 2 4.3" x 28.2" 110 mm x 717 mm
Bucket cylinder / 1 5.5" x 18.9" 140 mm x 480 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   5.7 sec
Dump   2.0 sec
Lower (empty)   3.2 sec
     
Service Refill Capacities    
     
Cooling system 7.4 U.S. gal 28 ltr
Fuel tank 49.1 U.S. gal 186 ltr
Engine 6.7 U.S. gal 23 ltr
Hydraulic system 20.6 U.S. gal 78 ltr
Axle front 4.9 U.S. gal 18.5 ltr
Axle rear 4.8 U.S. gal 18 ltr
Transfer case 2.1 U.S. gal 7 ltr

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