Comparison · Excavator

Hitachi ZX135US-7 vs Komatsu PC138USLC-11

The Komatsu PC138USLC-11 is about 6% heavier than the Hitachi ZX135US-7 (16,357 vs 15,450 kg), which usually means more stability and lifting capacity but higher transport weight.

Engine output is effectively the same on both machines.

Beyond the numbers, compare local dealer support, parts availability and resale value for Hitachi and Komatsu in your region: over the life of a machine they often matter more than small specification differences.

	Hitachi Hitachi ZX135US-7	Komatsu Komatsu PC138USLC-11
Operating weight	15,450 kg (34,100 lb)	16,357 kg (36,100 lb)
Engine power	74 kW (99 hp)	73 kW (98 hp)
Net power	≈73–75 kW (98–100 hp), depending on market	—
Max. digging depth	4.84–5.98 m (15 ft 11 in–19 ft 7 in), by arm	5.48 m (18 ft 0 in), 4.6 m boom + 2.5 m arm
Bucket digging force	104 kN (23,380 lbf)	—
Arm crowd force	61–77 kN, by arm	—
Tail swing	Short (rear stays close to track width)	—
ZX135US-7H (North America)	Isuzu, 74.9 kW (100 hp) net	—
ZX135US-7 (Europe)	73 kW net / 74 kW gross at 2,000 rpm	—
Short Reach Front (tunnelling)	16.2–17.8 t, 162 kN bucket force, 2.64 m dig depth, 0.62 m³ bucket	—
Net power (ISO 9249)	—	72.5 kW (97.2 hp) at 2,050 rpm
Max. reach at ground level	—	8.18 m (26 ft 10 in)
Bucket crowd force (ISO)	—	93 kN (9,500 kgf / 20,940 lbf)
Bucket capacity	—	0.26–0.76 m³ (0.34–1.00 yd³)
Engine model	—	Komatsu SAA4D95LE-7, four cylinders, variable-flow turbo
Displacement	—	3.26 L (199 in³)
Emissions	—	US EPA Tier 4 Final / EU Stage V
System	—	HydrauMind CLSS (closed-centre load sensing)
Max. pump flow	—	242 L/min (64 US gal/min)
Relief pressure – implement / travel	—	34.8 MPa (5,050 psi)
Arm crowd force (ISO)	—	62 kN (6,300 kgf / 13,890 lbf)
Swing speed	—	11 rpm
Swing torque	—	29.3 kN·m (21,627 lbf·ft)
Travel speed (low / high)	—	2.9 / 5.1 km/h (1.8 / 3.2 mph)
Max. drawbar pull	—	123 kN (27,560 lbf)
Overall track width	—	2.49 m (8 ft 2 in)
Track shoes	—	500, 600 or 700 mm triple grouser
Ground pressure	—	45.3 kPa (500 mm) / 37.9 kPa (600 mm)
Fuel tank	—	200 L (52.8 US gal)
DEF tank	—	12.6 L (3.3 US gal)
Hydraulic tank	—	69 L (18.2 US gal)
Sound in cab (ISO 6396)	—	71 dB(A)
Strengths	+ Short tail swing for road lanes and tight sites + Smooth Zaxis hydraulics and precise control + Tunnelling and short-reach versions available + ConSite monitoring and Hitachi reliability	+ Tight tail swing for work next to walls and live traffic + 2.49 m track width — easier to transport than wide-track machines + Long-carriage (LC) undercarriage gives good stability for its size + Return-flow arm valve and CLSS hydraulics help fuel economy + Komtrax standard
Watch-outs	− Lower forces than conventional 15–16 t machines − Several regional versions with different engines − Dealer coverage varies in the Americas	− Small four-cylinder engine limits heavy digging − Lower crowd forces than conventional-tail 14-tonne machines − Tier 4 Final / Stage V aftertreatment adds complexity
	Full ZX135US-7 review	Full PC138USLC-11 review

Specifications are typical figures for standard configurations and may be measured differently by each manufacturer (for example net vs gross power). Always confirm with the manufacturer or dealer. Build another comparison.