D51EXi-22

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Engine   
Model    Komatsu SAA6D107E-1* 
Type    4-cycle, water-cooled, direct injection 
Aspiration    Turbocharged, air-to-air aftercooled 
Number of cylinders   
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:     
SAE J1995 - Gross  133 HP  99 kW 
ISO 9249 / SAE J1349 - Net  130 HP  97 kW 
Hydraulic fan at maximum speed - Net  120 HP  90 kW 
Rated rpm    2200 rpm 
Fan drive type    Hydraulic (reversible) 
Lubrication system:     
Method    Gear pump, force lubrication 
Filter    Full-flow 
*EPA Tier 3 emissions certified     
Hydrostatic Transmission   
Dual-path, hydrostatic transmission provides infinite speed changes up to 9.0 km/h 5.6 mph. The variable capacity travel motors allow the operator to select the optimum speed to match specific jobs. Travel control lock lever and neutral switch. 
Travel speed
(quick shift mode) 
Forward  Reverse 
1st  0–2.1 mph
0–3.4 km/h 
0–2.5 mph
0–4.1 km/h 
2nd  0–3.5 mph
0–5.6 km/h 
0–4.0 mph
0–6.5 km/h 
3rd  0–5.6 mph
0–9.0 km/h 
0–5.6 mph
0–9.0 km/h 
Travel speed
(variable mode) 
Forward  Reverse 
  0–5.6 mph
0–9.0 km/h 
0–5.6 mph
0–9.0 km/h 
Final Drive   
Two-stage planetary gear integrated into axial piston travel motors. Compact in-shoe mount reduces risk of damage by debris. Bolt-on sprocket segments for easy replacement. 
Steering   
Palm Command Control System (PCCS) joystick control for all directional movements. Pushing the joystick forward results in forward machine travel, while pulling it rearward reverses the machine. Simply tilt the joystick to the left or right to make a turn. Tilting the joystick fully to the left or right activates counter-rotation. Hydrostatic Transmission (HST) eliminates steering clutches and brakes, providing smooth powerful turns. Fully electronic control enables smooth control. The PCCS utilizes shift buttons to increase and decrease speed. 
Minimum turning radius:  7'10"  2.39 m 
As measured by track marks on the ground at pivot turn.     
Undercarriage   
Suspension    Oscillating equalizer bar and pivot shaft 
Track roller frame    Monocoque, large section, durable construction 
Rollers and idlers    Lubricated track rollers 
Lubricated tracks:    Unique seals help prevent entry of foreign abrasive material into pin to bushing clearances for long service life. 
Parallel Link Undercarriage System (PLUS)    Increased component size and strength, and rotating bushing design provide extended wear life and lower maintenance. 
Number of track rollers (each side)   
Type of shoes (standard)    Single grouser PLUS 
Number of shoes (each side)    44 
Grouser height  2.2"  56 mm 
Shoe width (standard)  22"  560 mm 
Ground contact area  4,752 in²  30643 cm² 
Ground pressure
(with dozer, ROPS cab) 
5.76 psi  0.41 kgf/cm² / 39.7 kPa 
Track gauge  5'10"  1790 mm 
Length of track on ground  9'0"  2736 mm 
Service Refill Capacities   
Coolant  9.3 U.S. gal  35 ltr 
Fuel tank  71.3 U.S. gal  270 ltr 
Engine oil  5.3 U.S. gal  20 ltr 
Hydraulic tank  16.6 U.S. gal  63 ltr 
Final drive (each side)  1.1 U.S. gal  4.0 ltr 
Operating Weight   
Tractor weight:    Including ROPS cab, rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment. 
D51EX-22  24,074 lb  10920 kg 
Operating weight:    Including power angle tilt dozer, ROPS cab, operator, standard equipment, rated capacity of lubricant, coolant, and full fuel tank. 
D51EX-22  27,381 lb  12420 kg 
Hydraulic System   
Closed-center Load Sensing System (CLSS) designed for precise and responsive control and for efficient simultaneous operation.     
Hydraulic control unit:     
All spool control valves externally mounted remote to the hydraulic tank. Piston-type hydraulic pump with capacity (discharge flow) of 99 ltr/min 26.2 U.S. gal/min at rated engine rpm.     
Relief valve setting  3,983 psi  27.4 MPa / 280 kg/cm² 
Hydraulic cylinders    Double-acting, piston type 
Number of cylinders:  Bore  Bore 
Blade lift / 2  3.54"  90 mm 
Blade tilt / 1  3.94"  100 mm 
Blade angle / 2  3.54"  90 mm 
Hydraulic oil capacity (refilling):     
Power angle tilt dozer  16.6 U.S. gal  63 ltr 
Control valves:     
3-spool control valve for power angle tilt dozer.     
Positions:     
Blade lift    Raise, hold, lower, and float 
Blade tilt    Right, hold, and left 
Blade angle    Right, hold, and left 
Additional control valve required for ripper.     
Positions:     
Ripper lift    Raise, hold and lower 

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