Used Doosan DH55-7 Excavator

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Detailed Introduction to DOOSAN DH55-7 Crawler Excavator

The Doosan DH55-7 is a classic 5-ton class small crawler excavator developed and manufactured by Doosan Infracore, targeted at light and medium-duty construction scenarios. It is widely recognized globally for its high reliability, low operating cost, and excellent adaptability to narrow working spaces, making it one of the best-selling models in the small excavator segment for decades.

1. Core Technical Specifications

Parameter	Detailed Data
Operating Weight	5,250 – 5,500 kg (varies with track type, bucket configuration and counterweight)
Engine	Yanmar 4TNE94-BWFC 4-cylinder, water-cooled, 4-stroke direct-injection diesel engine
Rated Power	39 kW (52.3 HP) @ 2,200 rpm
Emission Standard	EU Stage II / US EPA Tier 2
Bucket Capacity	Standard 0.18 m³, optional range 0.17 – 0.21 m³
Max. Digging Depth	3,820 mm
Max. Digging Radius	6,110 mm
Max. Dumping Height	4,030 mm
Max. Digging Height	5,760 mm
Travel Speed	2.2 km/h (low gear) / 4.2 km/h (high gear)
Swing Speed	11 rpm
Gradeability	30° (58%)
Standard Track Width	400 mm (steel track is standard, rubber track is optional for road-friendly operation)
Overall Machine Width	1,880 mm (suitable for access to narrow alleys and indoor spaces)

2. Key Performance Advantages

2.1 High-efficiency Power System

The matched Yanmar industrial diesel engine features outstanding fuel economy, low noise and low vibration, adapting to poor-quality fuel in emerging markets with its 3-stage fuel filtration system. It delivers stable power output under continuous high-load operation, and has a service life 15% longer than similar engines in the same class.

2.2 Precise Hydraulic System

It adopts Doosan mature negative flow control (NFC) hydraulic system, with optimized valve group and pipeline design to realize smooth and coordinated compound actions (simultaneous digging, swinging and boom lifting). The core hydraulic components are supplied by world-renowned brands including Kawasaki and Kayaba, with low failure rate and small operation impact, greatly improving working efficiency.

2.3 Durable Structure Design

The boom, arm and X-type lower frame are welded with high-strength wear-resistant steel, and undergo stress relief treatment to resist deformation under harsh working conditions such as breaking operations.
The track system adopts fully sealed lubricated rollers and idlers, extending the maintenance interval by 30% compared with competing models.

2.4 Operator-friendly Cab

The cab is certified with ROPS (Roll-over Protective Structure) and FOPS (Falling Object Protective Structure), ensuring operation safety.
Equipped with adjustable suspension seat, low-force pilot control joysticks and high-performance HVAC system, the in-cab noise is controlled below 75 dB(A), reducing fatigue for long-time operation.
The integrated LCD instrument displays real-time data of fuel level, water temperature, oil pressure and fault codes, facilitating real-time status monitoring.

2.5 Low Maintenance & Operation Cost

All daily inspection and maintenance points are designed to be accessible from the ground, including air filter, fuel filter, engine oil filter and hydraulic oil level gauge. The extended maintenance interval (engine oil change every 500 working hours, hydraulic oil change every 2000 working hours) and widely available low-cost spare parts, plus Doosan's global after-sales service network, greatly reduce the total cost of ownership. The model also has a very high residual value in the second-hand equipment market.

3. Applicable Scenarios

The DH55-7 can be equipped with a variety of optional attachments (hydraulic breaker, auger, grapple, ripper, etc.) to adapt to different operation needs:

Municipal works: trench digging, pipe laying, sidewalk maintenance, urban greening construction
Rural infrastructure: land consolidation, fish pond excavation, homestead foundation digging
Indoor and narrow-space operation: basement demolition, narrow alley construction, interior renovation
Small construction sites: construction waste clearance, material handling, small foundation excavation

Final Overview

As a proven classic model of Doosan's small excavator product line, the DH55-7 balances performance, reliability and cost-effectiveness, making it the preferred choice for individual contractors, small construction teams and municipal maintenance departments worldwide.

Non flooded

No accident

Original product

Used Doosan DH55-7 Excavator

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