Home › Mini excavators › Komatsu

Komatsu PC78US-11

Configuration: Tight-tail-swing, 450 mm triple-grouser shoes, 3,710 mm one-piece boom, 2,250 mm arm, 0.20 m³ ISO 7451 heaped bucket, blade; EPA Tier 4 Final

26 sourced values · Sources: Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25

Check trailer fitDownload CSV

Dimension diagram

A B C D E F G Side viewFront view Schematic, not to scale
AOverall length6,295 mm
BOverall height2,740 mm
CTrack length on ground2,235 mm
DGround clearance410 mm
EOverall width2,330 mm
FTrack gauge / tread1,870 mm
GShoe / track width450 mm

Weights

SpecValueSource
Operating weight7,930 kg
Published: 7,930 kg
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
450 mm triple grouser (17,483 lb). Road liner 450 mm: 8,070 kg; triple grouser 600 mm: 8,250 kg; rubber 450 mm: 7,910 kg.

Dimensions

SpecValueSource
Overall length6,295 mm
Published: 6,295 mm
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
Dim. A.
Overall width2,330 mm
Published: 2,330 mm
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
Dim. C. Width of crawler (K) 2,320 mm.
Overall height2,740 mm
Published: 2,740 mm
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
Dim. D, to top of cab.
Transport height2,940 mm
Published: 2,940 mm
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
Dim. B, to top of boom.
Track gauge / tread1,870 mm
Published: 1,870 mm
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
Dim. J.
Track length on ground2,235 mm
Published: 2,235 mm
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
Dim. H.
Track length (overall)2,890 mm
Published: 2,890 mm
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
Dim. I.
Shoe / track width450 mm
Published: 450 mm
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
Dim. L.
Ground clearance410 mm
Published: 410 mm
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
Dim. F, minimum. Counterweight clearance 785 mm.
Tail swing radius1,390 mm
Published: 1,390 mm
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
Dim. G.

Undercarriage / tires

SpecValueSource
Undercarriage typeCrawler (steel tracks)
Published: Crawler (steel tracks)
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
X-frame; road-liner and rubber tracks available.
Track rollers / shoes per side5 track rollers, 1 carrier roller, 39 shoes per side
Published: 5 track rollers, 1 carrier roller, 39 shoes per side
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25

Ground pressure

SpecValueSource
Ground pressure35.8 kPa
Published: 35.8 kPa
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
ISO 16754, 450 mm triple grouser (0.36 kg/cm², 5.19 psi).

Engine

SpecValueSource
Engine modelKomatsu SAA3D95E-1
Published: Komatsu SAA3D95E-1
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
EPA Tier 4 Final.
Net power50.6 kW
Published: 50.6 kW
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
ISO 9249 / SAE J1349 (67.9 HP).
Gross power50.7 kW
Published: 50.7 kW
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
SAE J1995 (68 HP).
Displacement2.45 L
Published: 2.45 L
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
Rated speed1,850 rpm
Published: 1,850 rpm
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25

Hydraulics

SpecValueSource
Pump / aux flow168 L/min
Published: 168 L/min
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
Main variable pump (boom, arm, bucket, swing, travel). Blade gear pump 63 L/min.
System / relief pressure29.4 MPa
Published: 29.4 MPa
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
Implement circuits (4,264 psi). Travel 29.9 MPa.

Performance

SpecValueSource
Max digging depth4,660 mm
Published: 4,660 mm
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
Dim. C, 2,250 mm arm.
Max reach (at ground)6,780 mm
Published: 6,780 mm
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
Dim. G. Max digging reach 6,920 mm.
Dump height / clearance5,550 mm
Published: 5,550 mm
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
Dim. B. Max digging height 7,650 mm.
Breakout / digging force61.3 kN
Published: 61.3 kN
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
Bucket digging force, ISO. SAE 51.9 kN; arm crowd ISO 34.5 kN.
Max travel speed5 km/h
Published: 5 km/h
Komatsu PC78US-11 brochure, EN-PC78US-11BR0-1223-V5 (12/2023, EPA Tier 4 Final). Retrieved 2026-10-25
High; low 2.7 km/h.

Similar models

BrandModelOperating weight
YanmarViO80-7≈ 8,350 kg
Caterpillar307.57,505 kg
HitachiZX75US-78,380 kg
KubotaKX080-5≈ 8,401 kg
TakeuchiTB290≈ 8,430 kg
KobelcoSK75SR-78,490 kg

Compare side by side with Yanmar ViO80-7 and Caterpillar 307.5