Komatsu Dozer D155AX-7
D155AX-7
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 hydrostatic 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.
| Model | Komatsu SAA6D140E-6* | |
| Type | 4-cycle, water-cooled, direct injection | |
| Aspiration | 100 in³ | 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 |
| 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 |
| Double-reduction, spur and planetary final drives increase tractive effort. Segmented sprockets are bolt-on for easy in the field replacement. |
| 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. |
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| Minimum turning radius | 7'0" | 2.14 m |
| 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. |
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| 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 | |
| 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 |
| 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. |
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| 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 |
| Closed-center load sensing system (CLSS) designed for precise and responsive control, and for efficient simultaneous operation.
Hydraulic control unit: Relief valve setting |
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| 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 |
