D31PX-22

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Engine   
Model    Komatsu SAA4D95LE-5* 
Type    4-cycle, water-cooled, direct injection 
Aspiration    Turbocharged, air-to-air aftercooled 
Number of cylinders   
Bore x stroke  3.74" x 4.53"  95 mm x 115 mm 
Piston displacement  199 in³  3.26 ltr 
Governor    All-speed, electronic 
Horsepower:     
SAE J1995 - Gross  80 HP  60 kW 
ISO 9249 / SAE J1349 - Net  78 HP  58 kW 
Hydraulic fan at maximum speed - Net  71 HP  53 kW 
Rated rpm    2200 rpm 
Fan drive type    Hydraulic (reversible for cleaning) 
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 8.5 km/h / 5.3 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  0–5.3 mph
0–8.5 km/h 
0–5.3 mph
0–8.5 km/h 
Travel speed
(variable mode) 
Forward  Reverse 
  0–5.3 mph
0–8.5 km/h 
0–5.3 mph
0–8.5 km/h 
 
Final Drive   
Two-stage planetary gear integrated into axial piston travel motors. Compact in-shoe mount reduces risk of damage by debris. 
 
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:  7'3"  2.2 m 
As measured by track marks on the ground at pivot turn.     
 
Undercarriage   
Suspension    Rigid track frame 
Track roller frame    Solid one-piece, thick steel, durable construction 
Rollers and idlers    Lubricated track rollers 
Lubricated tracks:    Unique seals minimize the entry of foreign abrasive material into pin to bushing clearances to provide extended service life. Track tension is easily adjusted with a grease gun. 
Number of track rollers (each side)   
Type of shoes (standard)    Single grouser 
Number of shoes (each side)    40 
Grouser height  1.9"  47 mm 
Shoe width (standard)  24"  600 mm 
Ground contact area  4,061 in²  26200 cm² 
Ground pressure
(with dozer, ROPS cab) 
4.69 psi  0.33 kgf/cm² / 32.3 kPa 
Track gauge  5'5"  1650 mm 
Length of track on ground  7'2"  2185 mm 
 
Coolant & Lubricant Capacity (refilling)   
Coolant  4.8 U.S. gal  18 ltr 
Fuel tank  51.5 U.S. gal  195 ltr 
Engine oil  2.9 U.S. gal  11 ltr 
Hydraulic tank  15.9 U.S. gal  60 ltr 
Final drive (each side)  0.9 U.S. gal  3.5 ltr 
 
Operating Weight (APROXIMATE)   
Tractor weight:    Including ROPS cab, rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment. 
ROPS cab  16,138 lb  7320 kg 
Operating weight:    Including PAT dozer, ROPS cab, operator, standard equipment, rated capacity of lubricant, coolant, and full fuel tank. 
ROPS cab  18,827 lb  8540 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  2.95"  75 mm 
Blade tilt / 1  3.54"  90 mm 
Blade angle / 2  3.15"  80 mm 
Blade pitch    1 adjustable linkage 
Hydraulic oil capacity (refilling):     
Power angle tilt dozer  15.9 U.S. gal  60 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 
Note: Includes one additional spool for fan control.     
Additional control valve required for ripper.     
Positions:     
Ripper lift    Raise, hold and lower 

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