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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 
SAE J1995 - Gross  170 HP  127 kW 
ISO 9249 / SAE J1349 - Net  168 HP  125 kW 
Hydraulic fan at maximum speed - Net  155 HP  116 kW 
Rated rpm    1850 rpm 
Fan drive type    Hydraulic 
Lubrication system:     
Method    Gear pump, force lubricationn 
Filter    Full-flow 
TORQFLOW Transmission   
Komatsu TORQFLOW transmission consists of a water-cooled, 3-element, 1-stage, 1-phase torque converter and a planetary gear, multiple-disc clutch transmission which is hydraulically-actuated and force-lubricated for optimum heat dissipation. 
Travel speed  Forward  Reverse 
1st  0-2.0 mph
0-3.2 km/h 
0-2.7 mph
0-4.3 km/h 
2nd  0-3.5 mph
0-5.6 km/h 
0-4.5 mph
0-7.2 km/h 
3rd  0-5.4 mph
0-8.7 km/h 
0-11.0 km/h 
Final Drive   
Spur gear, double-reduction final drives increase tractive effort. Segmented sprocket teeth are bolt-on for easy in-the-field replacement. 
Steering System   
Palm Command Control System (PCCS) lever controls for all directional movements. Pushing the PCCS lever forward results in forward machine travel, while pulling it rearward reverses the machine. Simply tilt the PCCS lever to left to make a left turn.
Hydrostatic Steering System (HSS) is powered by steering planetary units and an independent hydraulic pump and motor. Counterrotation turns are also available.Wet, multiple-disc, pedal-controlled service brakes are spring-actuated and hydraulically released. Gear shift lock lever also applies parking brake. 
Minimum turning radius  5'11"  1.8 m 
As measured by track marks on ground.     
Suspension    Oscillation with equalizer bar and forward mounted pivot shafts 
Track roller frame    Monocoque, large section, durable construction 
Number of carrier rollers (each side)   
Track shoes  Lubricated tracks. Unique seals help prevent entry of foreign abrasive material into pin to bushing clearances to provide extended service life.  Parallel Link Undercarriage System (PLUS) with rotating bushings and extended wear life for lower maintenance costs. 
Number of track rollers (each side)   
Type of shoes (standard)    Single grouser PLUS 
Number of shoes (each side)    40 
Grouser height  2.3"  57.5 mm 
Shoe width (standard)  24"  600 mm 
Ground contact area  4,836 in²  31200 cm² 
Ground pressure
(with dozer, ROPS canopy): 
7.70 psi  53.1 kPa
0.54 kgf/cm² 
Track gauge  6'3"  1900 mm 
Length of track on ground  8'6"  2600 mm 
Coolant & Lubricant Capacity (refilling)   
Coolant  8.5 U.S. gal  32 ltr 
Fuel tank  103.0 U.S. gal  390 ltr 
Engine oil  7.7 U.S. gal  29 ltr 
Damper  0.3 U.S. gal  1.1 ltr 
Transmission, bevel gear,and steering system  18.2 U.S. gal  69 ltr 
Final drive (each side)  7.5 U.S. gal  28.5 ltr 
Operating Weight (APROXIMATE)   
Tractor weight:    Including rated capacity of lubricant, coolant, full fuel tank, operator and standard equipment. 
D61EX-15  31,087 lb  14100 kg 
Operating weight:    Including power angle tilt dozer, ROPS canopy, operator, standard equipment, rated capacity of lubricant, coolant, and full fuel tank. 
D61EX-15  37,237 lb  16890 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 beside the hydraulic tank. Piston-type hydraulic pump with capacity (discharge flow) of 195 ltr/min 51.5 U.S. gal/min at rated engine rpm. 
Relief valve setting  2,990 psi  210 kg/cm²
Hydraulic cylinders    Double-acting, piston 
Hydraulic cylinders:  Number of cylinders  Bore 
Blade lift  4.33"
110 mm 
Blade tilt  5.12"
130 mm 
Blade angle  4.33"
110 mm 
Hydraulic oil capacity (refilling):     
Power angle tilt dozer  14.5 U.S. gal  55.0 ltr 
Control valves:     
Spool control valve for power angle tilt dozer.     
Blade lift    Raise, hold, lower, and float 
Blade tilt    Right, hold, and left 
Blade angle    Right, hold, and left 
Spool control valve for semi-U and straight tilt dozer.     
Blade lift    Raise, hold, lower, and float 
Blade tilt    Right, hold, and left 

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