Used Komatsu 78 Excavator

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Detailed Introduction to Komatsu 78 (PC78US Series) Excavator

The "Komatsu 78" generally refers to the Komatsu PC78US series, a 7-8 ton class ultra-short tail swing compact hydraulic excavator manufactured by Komatsu Ltd., the global leading Japanese construction equipment manufacturer. It is one of the most popular small excavator models in the global market, famous for its compact design, reliable performance and high operational efficiency, especially suitable for narrow job sites.

1. Core Specifications (Latest PC78US-11 Model, Standard Configuration)

Item	Parameter
Operating Weight	7,600 – 8,100 kg (varies by cab type and attachment configuration)
Engine	Komatsu SAA4D88E-7 4-cylinder water-cooled diesel engine, compliant with EU Stage V / US Tier 4 Final / China National IV emission standards
Rated Net Power	48.5 kW @ 2,200 rpm
Standard Bucket Capacity	0.28 – 0.35 m³
Bucket Digging Force	60 kN
Arm Digging Force	37 kN
Max. Digging Depth	4,080 mm
Max. Digging Height	7,130 mm
Max. Dumping Height	5,040 mm
Tail Swing Radius	1,280 mm (only slightly wider than the crawler width, no extra space required for swing operation)
Travel Speed	2.8 km/h (low) / 4.5 km/h (high)
Swing Speed	11 rpm
Rated Fuel Tank Capacity	135 L

2. Key Features

(1) Ultra-short Tail Swing Design

The "US" in PC78US stands for Ultra Short Swing. Its tail swing radius is only 1.28m, which hardly exceeds the width of the crawler when rotating. This design allows it to operate freely in extremely narrow spaces such as urban alleys, indoor construction sites, roadside work areas close to buildings, and tunnels, greatly improving construction safety and work efficiency in limited sites.

(2) High-efficiency, Low-emission Power System

The latest generation PC78US is equipped with a Komatsu self-developed diesel engine with exhaust gas recirculation and diesel particulate filter technology, which meets the strictest global emission standards while maintaining strong power output. The built-in economic working mode (Eco Mode) reduces comprehensive fuel consumption by 6-10% compared with the previous generation model, effectively lowering operating costs.

(3) Precision Hydraulic System

It adopts Komatsu's proprietary CLSS (Closed-center Load Sensing System) hydraulic system, which can adjust oil flow accurately according to operating load. The coordination of composite actions (such as simultaneous digging, swinging and lifting) is smooth, with almost no lag, making it suitable for fine operation scenarios such as slope trimming, pipeline laying and landscaping.

(4) Comfortable & Safe Operator Cab

The cab is ROPS (Roll-Over Protective Structure) and FOPS (Falling Object Protective Structure) certified, which effectively protects the safety of the operator in case of rollover or falling object impact.
The fully sealed cab has excellent sound insulation performance, and the operating noise is only 70 dB(A), which is equivalent to the noise level of normal indoor conversation.
It is equipped with a fully adjustable air suspension seat, ergonomic control joysticks, automatic air conditioning and a 7-inch color LCD monitor that displays real-time operating data, fault warnings and fuel consumption in real time.

(5) Easy Maintenance & Smart Management

All daily maintenance points (oil filter, fuel filter, hydraulic oil filter, air filter, oil dipstick) are arranged at positions accessible from the ground, which reduces maintenance time and difficulty.
Equipped with Komatsu's exclusive KOMTRAX telematics system, which supports remote viewing of equipment location, working hours, fuel consumption, fault warnings and other data, helping fleet managers realize intelligent equipment management.

(6) High Durability & High Resale Value

The boom, arm and undercarriage frame are all made of high-strength reinforced steel, and have undergone strict anti-wear and anti-corrosion treatment, which can adapt to long-term heavy-duty operations. Komatsu excavators generally have a very high resale value in the global second-hand construction machinery market due to their stable quality.

3. Typical Application Scenarios

Urban Municipal Engineering: Trench excavation for water, electricity and gas pipeline laying, sidewalk maintenance, small road repair, etc.
Landscaping & Agriculture: Site leveling, tree pit digging, farmland water conservancy transformation, garden landscape construction, etc.
Confined Space Operation: Indoor demolition, basement construction, tunnel auxiliary construction, renovation work in old urban areas with narrow spaces.
Small Demolition & Recycling: Equipped with a hydraulic breaker, it can be used for small building demolition, concrete breaking and construction waste recycling.
Auxiliary Operations for Large Projects: Site cleaning, material handling, and auxiliary construction of large civil engineering projects such as highways and railways.

4. Optional Configurations

Users can choose customized configurations according to actual work needs:

Attachments: Rock bucket, narrow ditch bucket, hydraulic breaker, log grapple, auger drill, plate compactor, etc.
Quick coupler: Realize fast switching of different attachments within 1 minute, greatly improving work efficiency.
Crawler type: Rubber crawler (suitable for urban road operations, no damage to the pavement) / steel crawler (suitable for harsh construction sites with high wear requirements).
Cab type: Fully enclosed air-conditioned cab / open ROPS canopy (suitable for warm areas or low-budget needs).

5. After-sales Support

Komatsu has a complete global dealer network, providing users with original spare parts supply, professional maintenance services, operator training and standard warranty services. For PC78US series excavators, remote fault diagnosis is also supported through the KOMTRAX system, which can quickly solve equipment problems and reduce downtime.

Note: Specific parameters and configurations may vary slightly in different regional markets. It is recommended to contact the local Komatsu authorized dealer for the latest accurate information.

Non flooded

No accident

Original product

Used Komatsu 78 Excavator

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