Komatsu D155AX-7

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Features

The D155AX-7 is a dozer that bridges the gap between contractor site prep dozers and large contractor production/mining dozers. The Tier 4 interim D155AX-7 has the precise and responsive hydraulic control and smooth turning of hydro-static steering of smaller dozers for grading and big dozer features like a lock-up torque converter, Unique, high production Sigma dozer blade and K-bogie oscillating undercarriage.

Specifications

Engine    
Model   Komatsu SAA6D140E-6*
Type   4-cycle, water-cooled, direct injection
Aspiration   Komatsu variable geometry turbocharged, air-to-air aftercooled, cooled EGR
Number of cylinders   6
Bore x stroke 5.51" x 6.50" 140 mm x 165 mm
Piston displacement 930 in³ 15.24 ltr
Governor   All-speed and mid-range, electronic
Horsepower :    
SAE J1995 - Gross 360 HP 268 kW
ISO 9249 / SAE J1349 - Net 354 HP 264 kW
Rated rpm   1900 rpm
Fan drive type   Hydraulic
Lubrication system :    
Method   Gear pump, force lubrication
Filter   Full-flow
*EPA Tier 4 Interim and EU stage 3B emissions certified    
     
TORQFLOW Transmission    
Komatsu TORQFLOW transmission consists of a water-cooled, 3-element, 1-stage, 2-phase, torque converter with lockup clutch, and a planetary gear, multiple-disc clutch transmission which is electronically controlled, hydraulically actuated and force-lubricated for optimum heat dissipation. Shift lock lever and neutral safety switch.    
Travel speed:    
1st Gear forward 2.4 mph 3.8 km/h
1st Gear reverse 2.9 mph 4.6 km/h
2nd Gear forward 3.5 mph 5.6 km/h
2nd Gear reverse 4.2 mph 6.8 km/h
3rd L Gear forward 4.7 mph 7.5 km/h
3rd L Gear reverse 5.7 mph 9.2 km/h
3rd Gear forward 7.2 mph 11.6 km/h
3rd Gear reverse 8.7 mph 14.0 km/h
Final Drive    
     
Double-reduction, spur and planetary final drives increase tractive effort. Segmented sprockets 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 the left to make a left turn. Tilt it to the right for a right turn.     
     
Hydrostatic Steering System (HSS) is powered by steering planetary units and an independent hydraulic pump and motor. Counter-rotation turns are also available. Wet, multiple-disc, pedal-controlled service brakes are spring-actuated and hydraulically released. Gearshift lock lever also applies parking brakes.    
 
Minimum turning radius 7'0" 2.14 m
 
Undercarriage    
K-Bogie undercarriage    
Lubricated track rollers are resiliently mounted on the track frame with a bogie suspension system whose oscillating motion is cushioned by rubber pads.     
     
Track shoes    
Lubricated tracks. Unique dust seals for preventing entry of foreign abrasives into pin-to-bushing clearance for extended service. Track tension easily adjusted with grease gun.    
 
Suspension   Oscillation-type with equalizer bar and forward mounted pivot shafts
Track roller frame   Monocoque, high-tensilestrength steel construction
Rollers and idlers   Lubricated
Number of shoes (each side)   42
Grouser height 3.1" 80 mm
Shoe width (standard/maximum) 610 mm / 710 mm 24" / 28"
Ground contact area 6,193 in² 39955 cm²
Ground pressure (tractor only) 11.9 psi 82.4 kPa / 0.84 kg/cm²
Number of track rollers (each side)   7
Number of carrier rollers (each side)   2
     
Service Refill Capacities    
Fuel tank 165 U.S. gal 625 ltr
Coolant 27.3 U.S. gal 103.5 ltr
Engine oil 9.8 U.S. gal 37 ltr
Damper 0.4 U.S. gal 1.5 ltr
Hydraulic oil 24.2 U.S. gal 91.5 ltr
Transmission, bevel gear, and steering system 23.8 U.S. gal 90 ltr
Final drive (each side) 8.2 U.S. gal 31 ltr
 
Operating Weight    
Tractor weight    
Including rated capacity of lubricant, coolant, full fuel tank, operator and standard equipment.     
     
Operating weight    
Including strengthened SIGMADOZER®, giant ripper, ROPS cab, operator, standard equipment, rated capacity of lubricant, coolant, and full fuel tank.    
 
Tractor weight 68,350 lb 31000 kg
Operating weight 87,100 lb 39500 kg
Ground pressure 15.4 psi 106 kPa / 1.08 kg/cm²
 
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. Variable piston pump with capacity (discharge flow) of 325 ltr/min 85.9 U.S. gal/min for steering and 180 ltr/min 47.6 U.S. gal/min for implemented at rated engine rpm.     
 
Relief valve setting    
. . . for implement 27.5 MPa 280 kg/cm² 3,980 psi    
. . . for steering 38.2 MPa 390 kg/cm² 5,550 psi    
 
Control valves:    
Spool control valve for SIGMADOZER®, Semi-U tilt dozer and Full-U    
Positions: Blade lift Raise, hold, lower, and float
Blade tilt Right, hold, and left  
Additional control valve required for variable digging angle multi-shank ripper and giant ripper.    
Positions: Ripper lift Raise, hold, and lower
Ripper tilt Increase, hold, and decrease  
Hydraulic cylinders   Double-acting, piston
Number of cylinders Bore Bore
Blade Lift / 2 4.33" 110 mm
Blade Tilt (Dual tilt) / 2 6.30" 160 mm
Blade Tilt (Single Tilt) / 1 6.30" 160 mm
Ripper Lift 7.09" 180 mm
Ripper Tilt / 1 7.87" 200 mm
Hydraulic oil capacity (refill):    
SIGMADOZER 22.5 U.S. gal 85 ltr
Semi-U dozer 22.5 U.S. gal 85 ltr
Full-U dozer 22.5 U.S. gal 85 ltr
Ripper equipment (additional volume):    
Multi-shank ripper 9.8 U.S. gal 37 ltr
Giant ripper 9.8 U.S. gal 37 ltr

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