Used Dynapac CA251D Roller

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Here is a detailed introduction to the Dynapac CA251D single-drum vibratory roller in English.

Dynapac CA251D Single-Drum Vibratory Roller – Detailed Overview

The Dynapac CA251D is a heavy-duty single-drum vibratory roller designed for medium to large-scale soil and rock-fill compaction applications. Part of Dynapac’s proven CA250 series, this model is engineered to deliver high productivity, exceptional compaction performance, and low operating costs, making it a popular choice on road construction, dam building, airfield projects, and industrial site preparation.

Key Features and Benefits

1. Efficient Vibration System

The CA251D features Dynapac’s patented eccentric shaft vibration mechanism, which is located inside the drum. The system is renowned for its reliability and provides:

Dual amplitude / dual frequency settings – allows the operator to match the compaction energy to different material layers.
High centrifugal force for deep-lift penetration on granular soils and rockfill.
Automatic vibration engagement that activates at a preset speed to prevent irregular passes and material displacement.

2. Proven Powertrain

At the heart of the CA251D is a water-cooled, turbocharged Cummins QSB4.5 diesel engine (EU Stage IIIA / U.S. Tier 3 equivalent). With a rated output of 97 kW (130 hp) at 2,200 rpm, the engine delivers:

High torque at low revs, essential for steep gradeability.
Low fuel consumption combined with robust power.
Excellent worldwide parts availability and service support.

The drive system uses a hydrostatic transmission on both the drum and the rear axle, providing smooth traction control and a no-spin differential in the rear axle for outstanding off-road mobility.

3. Operator Comfort & Safety

The CA251D is available with an optional ROPS/FOPS-certified cab or an open platform. Ergonomic features include:

Low-vibration operator platform isolated from the chassis by rubber dampers.
Swivelling and adjustable steering console with clear, well-arranged instruments.
Excellent all-round visibility to the drum edges and rear, minimizing blind spots.
Ergonomically placed joystick for forward/reverse and vibration control.
Optional air-conditioning, heating, and an air-suspension seat for long working shifts.

Safety provisions include emergency stop buttons, seatbelt interlock (when fitted), and an automatic parking brake.

4. Advanced Compaction Management (Optional)

The CA251D can be equipped with Dynapac’s Compaction Analyzer (DCA) or the more advanced Dyn@lyzer system. These integrate with GPS to provide the operator with real-time pass mapping, temperature monitoring (on asphalt versions, though CA251D is a soil roller), frequency verification, and stiffness-based compaction measurement. This ensures uniform compaction and helps avoid over- or under-compaction.

5. Easy Maintenance

Dynapac designed the CA251D for simplicity and long service life:

Engine and hydraulic components are clustered in a central rear module that tilts open for full ground-level access.
Centralized lubrication points and easy-to-check sight gauges.
Long service intervals (engine oil at 500 hours, hydraulic oil at 2,000 hours) reduce downtime.
No daily greasing of the eccentric bearings required – the vibration housing is sealed and oil-lubricated for life.

Technical Specifications (Typical Data)

Parameter	Value
Operating Weight (incl. ROPS cab)	Approx. 11,400 kg (25,130 lb)
Max. Operating Weight	12,500 kg (27,560 lb) (ballasted)
Drum Width	2,130 mm (84 in)
Drum Diameter	1,540 mm (61 in)
Static Linear Load (drum)	Approx. 29 kg/cm (162 lb/in)
Vibration Frequency	30 Hz (1,800 vpm) / 36 Hz (2,160 vpm)
Nominal Amplitude (High / Low)	1.7 mm / 0.8 mm (0.067 in / 0.031 in)
Centrifugal Force (High / Low)	260 kN / 166 kN (58,450 lbf / 37,320 lbf)
Engine	Cummins QSB4.5, 4-cylinder turbo-diesel
Engine Power	97 kW (130 hp) @ 2,200 rpm
Travel Speed (forward / reverse)	0–10 km/h (0–6.2 mph)
Gradeability (theoretical)	55%
Fuel Tank Capacity	270 litres (71 US gal)
Steering Angle	±38° articulation
Oscillation Angle	±9°

(Specifications are indicative and may vary by equipment version and regional configuration. Always consult the current manufacturer data sheet.)

Primary Applications

The Dynapac CA251D is optimized for compacting:

Sub-bases and base courses of roads, highways, and railways.
Earth-fill embankments and large construction pads.
Rock-fill and dam core materials.
Industrial yard and airport runway foundations.

Its high centrifugal force and heavy drum weight make it particularly effective for achieving density targets on thick lifts (typically 300–600 mm and more, depending on material) of granular soils and crushed rock.

Summary

The Dynapac CA251D combines robust build quality with efficient compaction technology and a comfortable operator environment. It remains a benchmark in the 11–12 tonne class for contractors who require reliability, excellent compaction results, and low cost per compacted cubic metre. For the latest specifications, emissions standards (Stage IV/Tier 4 Final versions may be available as CA251D variant or successor), and options, it is recommended to refer to the official Dynapac product documentation.

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Used Dynapac CA251D Roller

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