Komatsu D155A Crawler dozers tech specs

Overview

The D155A lineup is Komatsu’s mid‑size crawler dozers- tough enough for everything from heavy grading to landfill duty. As it marches from the -1 to the int’l -8, you get cleaner emissions, better cab comfort, auto‑idle, and SIGMADOZER options. SL gives you wider tracks, WH makes it trash‑tough. In short: get your telco-ready hard hat on, the D155A means business.

What’s new

• Newer -8 models got Tier 4-final SAA6D140E‑7 engines, cleaner burn, same power bump.
• Auto-pitch and ripper auto-return cut operator fatigue; shift into reverse and the ripper raises itself.
• WH variant stacks added shields, auto-reverse fan, and striker bars for trash comp.

Performance & efficiency

The hydrostatic steering with lock-up torque converter gives smooth power transfer and lowers fuel waste, king on long hauls. SIGMADOZER blades in heavier trims mean better load carry and less spill. Operator feedback in hard ground say these keep pace with larger cats but sip less fuel, it’s that mortar-and-steel feel that seals the deal.

Maintenance & ownership

Service points are grouped, Komtrax watches your back, and parts commonality across the D-series means fewer surprises. Tier 4 systems like DPF/SCR add oiling needs and DEF cost, but overall uptime is solid if filters are changed and electronics aren’t ignored. Just budget for undercarriage on slippy ground or rotary waste sites.

In cabin & interior

Cab is quiet, pressurized, with big glass for visibility. Palm‑command joysticks, auto shift/auto‑idle features, plus auto fan, climb in, and you’re set for a long haul shift.

Safety features

Standard ROPS/FOPS, plus tight sightlines. WH models step it up with striker bars, extra guarding, and auto reversing fans, designed to soak up landfill abuse smartly.

In comparison

• Versus D155A‑1: Old-school and simple (~320 hp), but lacks Tier 4, auto systems, and comfort.
• Versus Cat D8T: D155A-8 is lighter and smaller but brings similar horsepower and bigger blades. Carry the logic of better visibility and tighter turning radius.
• Versus next-size D275A: If you don’t need ~50 t of slab and your site is tighter, the D155A saves fuel, shifts faster, and fits where the bigger rig doesn’t.

Verdict

Need a mid-size dozer that’s cleaner, smarter, and built for long shifts? The D155AX‑8 and its siblings are worth a look- earning a solid 4/5 stars. Stick with SL on soft ground, WH only if you’re trashing. Tune your service, don’t treat the tech like a nuisance, and you’ve got a solid grading and waste hauler with brains.
Owner sentiment: Rugged, ergonomic, and efficient, with the occasional electronics hiccup when DEF or sensors aren’t fed right.