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Model    Komatsu SAA6D107E-2* 
Type    4-cycle, water-cooled, direct injection 
Aspiration    Komatsu variable geometry 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 and mid-range, electronic 
SAE J1995 - Gross  170 HP  127 kW 
(ISO 14396  169 HP  126 kW 
ISO 9249 / SAE J1349 - Net  168 HP  125 kW 
Rated rpm    2200 rpm 
Fan drive type    Hydraulic 
Lubrication system:     
Method    Gear pump, force lubricationn 
Filter    Full-flow 
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  0-3.4 km/h 0-2.1 mph  0-4.1 km/h 0-2.5 mph 
2nd  0-5.6 km/h 0-3.5 mph  0-6.5 km/h 0-4.0 mph 
3rd  0-9.0 km/h 0-5.6 mph  0-9.0 km/h 0-5.6 mph 
Travel speed (variable mode)  0-9.0 km/h 0-5.6 mph  0-9.0 km/h 0-5.6 mph 
*Quick shift speeds are adjustable in the monitor.     
Final Drive   
In-shoe mounted axial piston type travel motors with integrated two-stage planetary gear reduction. Compact in-shoe mount reduces risk of damaged by debris. Bolt-on sprocket teeth for easy displacement. 
Steering System   
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) provides smooth powerful turns. Fully electronic control enables smooth control that can be adjusted in the monitor. The PCCS utilizes shift buttons to increase and decrease speed. 
Minimum turning radius (as measured by track marks on the ground at pivot turn.)  83"  2.1 m 
Suspension    Oscillating-type with equalizer bar and pivot shafts 
Track roller frame    Monocoque, large section, durable construction 
Rollers and idlers    Lubricated track rollers 
Lubricated tracks  Parallel Link Undercarriage System (PLUS) with lubricated rotating bushings for extended system wear life and lower maintenance costs.  Track tension is easily adjusted with grease gun. 
Number of track rollers (each side)   
Type of shoes (standard)    Single grouser 
Number of shoes (each side)    46 
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): 
8.08 psi  55.7 kPa
0.57 kgf/cm² 
Track gauge  6'3"  1900 mm 
Length of track on ground  10'5"  3161 mm 
Service Refill Capacities   
Coolant  11.9 U.S. gal  45 ltr 
Fuel tank  98.3 U.S. gal  372 ltr 
Engine oil  7.2 U.S. gal  27 ltr 
Hydraulic tank  26.7 U.S. gal  101 ltr 
Final drive (each side)  2.2 U.S. gal  8.1 ltr 
Operating Weight (APROXIMATE)   
Tractor weight:    Including ROPS cab, U frame for power angle tilt dozer, rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment. 
D61EX-15  36,999 lb  16780 kg 
Operating weight:    Including Power Angle Tilt dozer, ROPS cab, operator, standard equipment, rated capacity of lubricant, hydraulic control unit, coolant, and full fuel tank. 
D61EX-15  39,099 lb  17735 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 171 ltr/min / 45 U.S. gal/min at rated engine rpm. 
Relief valve setting  3,974 psi  280 kg/cm²
Hydraulic cylinders    3,974 
Hydraulic cylinders:  Number of cylinders  Bore 
Blade lift  4"
100 mm 
Blade tilt  5"
120 mm 
Blade angle  4"
100 mm 
Hydraulic oil capacity (refilling):     
Power angle tilt dozer  26.7 U.S. gal  101 ltr 
Control valves:     
3-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 
Additional control valve required for ripper     
Ripper lift    Raise, hold, and lower 

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