Komatsu HM400-5

Configuration: Standard 24 m³ (SAE 2:1 heaped) body, 29.5R25 tires; EPA Tier 4 Final

Dimension diagram

Spec	Value	Source
Operating weight	35,055 kg	Published: 35,055 kg Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Empty weight (77,283 lb).
Max gross (laden) weight	75,135 kg	Published: 75,135 kg Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Gross vehicle weight (165,644 lb).

Spec	Value	Source
Overall length	11,105 mm	Published: 11,105 mm Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Read from the dimension drawing.
Overall width	3,450 mm	Published: 3,450 mm Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Front-view overall width from the drawing; width over mirrors 4,043 mm.
Overall height	3,845 mm	Published: 3,845 mm Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Highest dimension on the side-view drawing; a second height of 3,735 mm (apparently cab roof) is also shown. Body raised: 7,171 mm.
Wheelbase	4,350 mm	Published: 4,350 mm Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Front axle to first rear axle, from the drawing. Rear tandem spacing 1,970 mm.
Track gauge / tread	2,690 mm	Published: 2,690 mm Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Tread, front view of drawing.
Ground clearance	710 mm	Published: 710 mm Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 From drawing (2 ft 4 in).
Turning radius	8,885 mm	Published: 8,885 mm Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Drawing R8,885 mm; the spec table gives minimum turning radius wall to wall 8.8 m.

Spec	Value	Source
Undercarriage type	Wheeled, articulated (6 x 6)	Published: Wheeled, articulated (6 x 6) Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Full-time all-wheel drive; hydro-pneumatic suspension.
Number of axles	3	Published: 3 Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24
Wheels (count)	6	Published: 6 Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24
Tire size	29.5R25	Published: 29.5R25 Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 875/65R29 optional.

Spec	Value	Source
Ground pressure	Not published	Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Not published.
Ground pressure, loaded (highest axle)	Not published	Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Not published.

Spec	Value	Source
Axle load, front (unladen/operating)	Not published	Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Not published in kg; empty weight distribution front 56.9 %, centre 23.6 %, rear 19.5 %.
Axle load, rear (unladen/operating)	Not published	Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Not published in kg (distribution only).
Axle load, front (laden/max)	Not published	Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Not published in kg; loaded distribution front 30.4 %, centre 35.8 %, rear 33.8 %.
Axle load, rear (laden/max)	Not published	Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Not published in kg (distribution only).

Spec	Value	Source
Engine model	Komatsu SAA6D140E-7	Published: Komatsu SAA6D140E-7 Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 EPA Tier 4 Final.
Net power	348 kW	Published: 348 kW Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 ISO 9249 / SAE J1349 (466 HP), spec table. The standard-equipment list states 350 kW (469 HP).
Gross power	353 kW	Published: 353 kW Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 SAE J1995 (473 HP).
Displacement	15.24 L	Published: 15.24 L Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24
Rated speed	2,000 rpm	Published: 2,000 rpm Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24

Spec	Value	Source
Pump / aux flow	Not published	Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Not published.
System / relief pressure	28.4 MPa	Published: 28.4 MPa Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Hoist circuit (4,119 psi).

Spec	Value	Source
Max travel speed	55.9 km/h	Published: 55.9 km/h Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Maximum (34.7 mph).
Rated payload	40,000 kg	Published: 40,000 kg Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 40 metric tons (44.1 US tons).
Body capacity (heaped)	24 m³	Published: 24 m³ Komatsu HM400-5 brochure, AESS878-0225 (EV-2, 02/25, Tier 4 Final). Retrieved 2026-10-24 Heaped SAE 2:1 (31.4 yd³). Struck 18.2 m³.

Compare side by side with Volvo A50 and Caterpillar 745