Used Komatsu 78 Excavator

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Komatsu PC78 Series Excavator (Official Designation: Komatsu PC78US-11, Latest Generation)

The Komatsu 78 is a 7–8 ton class ultra-short tail swing midi hydraulic excavator, developed by Komatsu Ltd., the global leading heavy equipment manufacturer. It is tailored for tight-space, medium-duty operations, combining industry-leading durability, fuel efficiency, and maneuverability to meet demands of independent contractors, rental fleet operators, and municipal construction teams.

Core Specifications

Item	Parameter
Operating Weight	7,780 – 8,020 kg (varies by configuration: rubber/steel track, attachment setup)
Engine	Komatsu SAA4D88E-7 water-cooled 4-cylinder diesel engine, compliant with EU Stage V / U.S. EPA Tier 4 Final emission standards
Net Rated Power	44.4 kW (59.6 HP) @ 2,200 rpm
Bucket Capacity	0.12 – 0.32 m³
Maximum Digging Depth	4,080 mm
Maximum Horizontal Digging Reach	6,640 mm
Maximum Loading Height	4,660 mm
Tail Swing Radius	1,290 mm (only 95 mm overhang beyond the track, minimal collision risk in narrow sites)
Travel Speed	3.2 km/h (low) / 5.5 km/h (high)
Fuel Tank Capacity	135 L
Hydraulic System Rated Flow	140 L/min

Key Features

1. High-Efficiency, Low-Downtime Powertrain

The SAA4D88E-7 engine uses EGR (Exhaust Gas Recirculation) + DOC (Diesel Oxidation Catalyst) aftertreatment system, no Diesel Particulate Filter (DPF) required, eliminating active regeneration downtime and long-term DPF maintenance costs.
Standard ECO mode reduces fuel consumption by up to 6% compared to the previous PC78US-10 generation, without compromising output. Auto idle shutdown function cuts unnecessary fuel waste during long idle periods.

2. Advanced Hydraulic System

Equipped with Komatsu proprietary CLSS (Closed-Center Load Sensing System), which delivers on-demand hydraulic flow for smooth simultaneous operation of boom, arm, swing, and travel functions, even under heavy load.
Pre-installed auxiliary hydraulic circuits for common attachments (breaker, grapple, auger) and quick coupler interface, reducing refitting time for multi-scene operations. Two working modes (Power / ECO) are switchable for different workload demands.

3. Ultra-Short Tail Swing Design

The minimal tail overhang makes it ideal for operation in space-restricted sites: urban narrow streets, indoor demolition, residential construction sites adjacent to buildings, and roadside utility work, without risk of hitting surrounding obstacles.

Operator Comfort

The cabin is ROPS (Roll-Over Protective Structure) and FOPS (Falling Object Protective Structure) certified, ensuring operator safety in high-risk working conditions.
Air-suspension adjustable seat, ergonomic control levers, and a 7-inch high-definition LCD monitor that displays real-time operating data (fuel consumption, fluid temperature, maintenance alerts) reduce fatigue during long shifts.
Cabin noise is controlled at 72 dB(A), with a high-efficiency fully-sealed air conditioning system, USB charging port, cup holder, and large storage compartment for improved working experience. Standard rear-view camera eliminates blind spots during reversing and slewing.

Maintenance & Durability

Extended service intervals: engine oil change every 500 operating hours, hydraulic oil change every 5,000 hours, hydraulic return filter replacement every 2,000 hours, reducing overall operating costs.
All daily maintenance points are accessible from ground level, no need to climb onto the machine for routine checks.
High-strength steel reinforced boom, arm and undercarriage frame provide strong impact resistance for harsh working conditions. Rubber tracks are standard for non-damaging operation on urban pavement, with steel tracks optional for heavy-duty earthmoving scenarios.
Standard Komatsu KOMTRAX remote monitoring system: fleet owners can track real-time machine location, operating hours, fuel consumption, and fault codes via mobile or web portal, supporting anti-theft management, predictive maintenance, and fleet efficiency optimization.

Typical Application Scenarios

Urban utility work: water pipe/cable trench digging, pavement repair, street greening construction
Landscaping: site grading, pond digging, tree planting, terrain shaping
Small-scale demolition: indoor demolition, low-rise building teardown, construction waste clearance
Agricultural construction: irrigation trench digging, farm infrastructure building, barn cleaning
Residential construction: foundation digging, site leveling, material handling
Rental fleet operations: high versatility, low maintenance cost, and easy operation make it one of the most popular rental midi excavator models globally.

Komatsu provides global after-sales support, original spare parts supply, and a standard 1-year/2,000-hour full machine warranty for the PC78US series, with extended warranty options available for core components (engine, hydraulic system).

Non flooded

No accident

Original product

Used Komatsu 78 Excavator

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