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Komatsu D155AX-8 Bulldozer Your big jobs demand a big dozer. 350+ horsepower, massive blade capacity with semi-U and full U blades, automatic lockup torque converter, and low drive K-bogie suspended undercarriage designed for maximum traction and smooth ride when dozing or ripping.
Custom build the dozer you need: All the dozers in the D65/85/155 family offer you outstanding power, economy and reliability. Customize yours with the blade (straight, Semi-U, Sigmadozer and Full U (D155 only)), track shoe width and horsepower combo best suited to your particular application. Helps minimize fuel use: An advanced Tier 4 engine offers you a potent combo of power and fuel efficiency. An auto idle shutdown, adjustable from 5-60 minutes, also helps cut fuel use and emissions. Controls help fight operator fatigue: Operators will enjoy the palm command electronic control joysticks that fit the natural relaxed shape of their hands. Auto-shift or manual-shift modes are easily selected with one push of a button for precision with less fatigue over the course of a shift. Smooth, powerful handling: Your operators can execute smooth powerful turns with the hydrostatic steering system. It transmits engine power to both tracks without power interruption and minimizes turning radius with counter-rotation while in neutral. Long-lasting undercarriage: Get the most from your dozer. The Parallel Link Undercarriage System (PLUS) with rotating bushings delivers up to twice the life of our conventional undercarriage with no pin and bushing turn required. Parts wear evenly and last longer before needing replacement. Work with fuel-efficient power: Seek maximum work efficiency with a lock-up torque converter. It determines the appropriate gear based on load and conditions. The lockup mechanism then automatically transfers engine power directly to the transmission, helping boost drive train efficiency. intelligent Machine Control (iMC): With automatic dozing, rough cut to finish grade, iMC-equipped machines make every pass count. Dozers “learn” operator blade input. In select situations, operators can opt for near-100% auto control. And, iMC helps new operators get up to speed quickly. Help operators stay focused: Your operators perform best when they’re comfortable. That’s why they’ll love the air suspension seat with lumbar support and tilt. It’s easy for them to adjust to suit their needs, and electric heat helps them stay comfortable in the cold. Situational awareness: A standard rear camera monitoring system displays the view behind the dozer on the large color monitor in the cab. No-hassle DPF regeneration: Tier 4 machines use diesel particulate filters to burn off engine soot via regeneration. To help make sure it rarely impacts your operation, all D65/D85/D155 models use continuous passive regeneration, and active regeneration that typically doesn’t require the dozer to stop. Efficient blade pitch operation: Pressing the auto-pitch switch* lets the operator toggle blade pitch position from dig to dump with no lever movements. The blade pitch control can be set to automatically return to the digging position when reverse is selected. * Requires dual tilt dozer Ergonomic ripper controls: Operators will love the ergonomic ripper control lever that incorporates an auto-return function. It automatically raises the ripper so they can stop grappling with levers and focus on other tasks. It kicks in when travel lever is moved to reverse. |
| Dimensions | |
|---|---|
| Length | 27’7” |
| Width | 7 ft. (2,134 mm) cab |
| Height | 11 ft. 1 in. (3,377 mm) |
| Weight | 72,100 lbs. |
| Ground Clearance | 1’8” |
| Turning Radius | 7 ft. (2.1 m) |
| Operating Weight | 89,300 lbs. |
| Fuel Tank Capacity | 165 gal. (625 l) |
| Frame Type | Track roller frame: Monocoque, high-tensile strength steel construction |
| Final Drive | Double-reduction, spur and planetary final drives increase tractive effort. Segmented sprockets are bolt-on for easy in-the-field replacement |
| Engine | |
|---|---|
| Engine Make | Komatsu |
| Engine Model | SAA6D140E-7 |
| Engine Type | 4-cycle, direct injection |
| Cylinders | 6 |
| Net Horsepower | 354 HP |
| Cooling | Water-cooled |
| Bore x Stroke | 5.51 x 6.50 in. (140 x 165 mm) |
| Displacement | 930 cu. in. (15.2 l) |
| Speed - Foreward | 1st: 2.4 mph (3.8 km/h) 2nd: 3.5 mph (5.6 km/h) 3rdL: 4.7 mph (7.5 km/h) 3rd: 7.2 mph (11.6 km/h) |
| Speed - Reverse | 1st: 2.9 mph (4.6 km/h) 2nd: 4.2 mph (6.8 km/h) 3rdL: 5.7 mph (9.2 km/h) 3rd: 8.7 mph (14 km/h) |
| Gross Horsepower | 360 hp (268 kW) @ 1,900 rpm |
| Governor | Mid-range, electronic |
| Rated RPM | 1900 RPM |
| Lubrication System | Method: Gear pump, force lubrication Filter: Full-flow |
| Aspiration | Variable Geometry Turbocharged, air-to-air aftercooled, cooled EGR |
| Piston Displacement | 930 in³ |
| Fan Drive Type | Hydraulic |
| Drivetrain | |
|---|---|
| Number of Speeds | 4 |
| Tracks | 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. |
| Track Rollers | 7 each side |
| Ground Pressure | 14.4 PSI 11.6 PSI (tractor only) |
| Grouser Height | 3.1” |
| Carrier Rollers | 2 each side |
| Hydraulic | |
|---|---|
| Control Valve | Spool control valve for SIGMADOZER, Semi-U tilt dozer and Full-U tilt dozer Positions: Blade lift-Raise, hold, lower, and float Blade tilt-Right, hold, and left Spool control valve 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 |
| Hydraulic System | Closed-center load sensing system (CLSS) designed for precise and responsive control, and for efficient simultaneous operation |
| Hydraulic Cylinders | Number of cylinders x bore Blade Lift: 2 x 4.33” Blade Tilt: 1 x 6.30” Ripper Lift: 1 x 7.09” Ripper Tilt: 1 x 7.87” |
| Relief Valve Setting | 3,980 PSI (for implement) 5,550 PSI (for steering) |
| Operational | |
|---|---|
| Blade Width | 13 ft. 4 in. (4,063 mm) SIGMADOZER 13 ft. 10 in. (4,215 mm) Full-U Dozer 13 ft. 7 in. (4,139 mm) Semi-U Dozer |
| Blade Height | 6’1” (Strengthened SIGMADOZER) 5’10” (Full-U Tilt Dozer & Semi-U Tilt Dozer) |
| Blade Capacity | 12.3 yd ³ (Strengthened SIGMADOZER & Semi-U Tilt Dozer) 15.6 yd ³ (Full-U Tilt Dozer) |
| Blade Tilt | 2 ft. 10 in. (863 mm) SIGMADOZER 3 ft. (914 mm) Full-U Dozer 2 ft. 10 in. (863 mm) Semi-U Dozer |
| Dig Depth | Maximum Drop Below Ground: 2 ft. 3 in. (686 mm) SIGMADOZER 1 ft. 11 in. (585 mm) Full-U Dozer 1 ft. 11 in. (585 mm) Semi-U Dozer |
| Suspension | Oscillation-type with equalizer bar and forward mounted pivot shafts |
| Steering | 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. |
| Shoes | 42 each side |
| Shoe Width | 24” (Standard) 28” (Maximum) |
| Blade Length` | 13'4" (Strengthened SIGMADOZER) 13'10" (Full-U Tilt Dozer) 13'7" (Semi-U Tilt Dozer) |
| Ground Contact | 6,193 in² |
*Price, if shown, is Manufacturer's Suggested Retail Price (MSRP) and does not include government fees, taxes, dealer freight/preparation, dealer document preparation charges or any finance charges (if applicable). MSRP and/or final actual sales price will vary depending on options or accessories selected.
