WA50-6

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Engine-EPA Certified   
Model    Komatsu 4D88E-6B* 
Type    Water cooled, 4-stroke cycle 
Number of cylinders   
Bore x stroke  3.48" x 3.56"  88 mm x 90 mm 
Piston displacement  135 in³  2.189 ltr 
Governor    Mechanical, all-speed control 
Horsepower:     
SAE J1995 - Gross  39.8 HP  29.7 kW 
ISO 9249 / SAE J1349 - Net  38.6 HP  28.7 kW 
Rated rpm    2400 rpm 
Fuel system    Direct injection 
Lubrication system:     
Method    Gear pump, force-lubrication 
Filter    Full-flow 
Air cleaner    Dry-type with single radial-sealed element and dust evacuator, plus dust indicator 
* EPA Tier 3 and EU Stage 3A emissions certified.     
 
Transmission   
Transmission - Hydrostatic, 1 pump, 1 motor variable speed control 
 
Axles and Final Drives   
Drive system:    Four wheel-drive 
Front    Fixed, semi-floating 
Rear    Center-pin support, semi-floating 14° total oscillation 
Reduction gear    Spiral bevel gear 
Differential gear    Conventional 
Final reduction gear    Planetary gear, single reduction 
 
Brakes   
Service brake    Mechanical, wet, multi-disc brakes actuate on four wheels 
Parking brake    Mechanical, wet, multi-disc brake on transfer output shaft 
 
KOMTRAX   
• Level 2 Satellite Monitoring System     
• E-mail / text notifications     
• Location (daily and movement)     
• Hour meter     
• Daily operation times     
• Out of area notice     
• Engine start attempt during lockout period notice     
• Forced engine lock / unlock     
• Night / scheduled lock     
• Residual fuel quantity     
• High water temperature level     
• Cautions     
• Abnormalities     
 
Bucket Controls   
Control positions:     
Boom    Raise, hold, lower & float 
Bucket    Tilt-back, hold, and dump 
 
Hydraulic System   
Capacity (discharge flow) @ engine-rated rpm:     
Maximum flow for loader circuit     
Loader pump  12.2 U.S. gal/min  46.5 ltr/min 
HST charge pump  6.3 U.S. gal/min  24 ltr/min 
Auxiliary hydraulic  12.2 U.S. gal/min  46.5 ltr/min 
Relief valve setting:     
Loader  3,000 psi  210 kg/cm² 
Steering  2,500 psi  175 kg/cm² 
Control valve    3-spool open center type 
Hydraulic cylinders:     
Loader and steering    Double-acting, piston type 
Hydraulic cycle time (rated load in bucket)     
Raise    5.7 sec 
Dump    1.0 sec 
Lower (empty)    3.5 sec 
Total cycle time    10.2 sec 
 
Service Refill Capacities   
Cooling System  1.8 U.S. gal  7.0 ltr 
Fuel Tank  13.2 U.S. gal  50 ltr 
Engine  2.0 U.S. gal  7.5 ltr 
Hydraulic system  11.1 U.S. gal  42 ltr 
Axle (front / rear)  1.3 / 1.2 U.S. gal  4.8 / 4.5 ltr 
Transmission  0.4 U.S. gal  1.4 ltr 
 
Steering System   
Type    Full-hydraulic power steering independent of engine rpm 
Steering angle    42.5° each direction 
Minimum turning radius at the center of outside tire  10'3"  3125 mm 

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