Wirtgen
WS250

WIRTGEN WS250 — TRACTOR-TOWED STABILIZER

The tractor-towed stabilizer can be attached to a tractor in a few swift moves. The adjustable rotor plate ensures the homogeneous mixing quality of binding agent and soil. Side plates which move on skids, the mechanical belt drive on each side and the effective milling and mixing rotor contribute to the high performance. In the soil improvement process, the tractor-towed stabilizer produces soils suitable for placing and compacting, while in the soil stabilization process, it creates load-bearing surfaces.

THE POWERFUL UNIT FOR EFFECTIVE SOIL STABILZATION

• The WS 220 tractor-towed stabilizer is designed for efficient soil stabilization at a working width of 7′ 1″ (2.15 m).

• Their range of applications covers both soil improvement and soil strengthening measures.

• In soil improvement, the tractor-towed stabilizers produce soils suitable for placing and compacting to create embankments, slopes, backfills or site haulage roads.

• In soil strengthening, they create load-bearing surfaces for the construction of parking lots, roads, sports grounds, track beds, harbor facilities, airports or industrial parks.

FEATURES

HEAVY-DUTY LINKAGE

• Reliable Transmission of Power: Heavy-duty shaft drive for reliable transmission of the engine power to the milling and mixing rotor by means of an overload clutch

• Three-Point Hitch: Standardized three-point hitch tailored to field requirements.

• Easy Attachment: Attachment to the tractor is completed quickly in a few simple steps.

EFFICIENT MILLING AND MIXING PERFORMANCE

• Powerful Milling and Mixing Rotor: available with different toolholder systems.

• Mechanical Drive: Highly efficient mechanical belt drives on the left and right.

• Eccentric Milling Rotor Gearbox: Pulley housing always remains above the ground due to eccentric milling drum gearbox.

• Quick Replacement of Cutting Tools: Easy replacement of cutting tools using a pneumatic tool extractor.

EFFICIENT WATER METERING

• Reliable Water Spraying System: Microprocessor-controlled spraying system including a heavy-duty water pump and flow meter for exact compliance with the predetermined quantity of water to be added.

• Control Panel with Essential Information: Intuitive operation and monitoring of added water with the integrated (ISOBUS) display on the tractor or an optional touchscreen panel.

EFFECTIVE CONCEPT

• Adjustable Rotor Plate: Adjustable rear rotor plate in extra high position.

• High Contact Pressure: Rotor plate with high contact pressure for homogeneous mixing quality.

• Adjustable Levelling Blade: Mechanically adjustable levelling blade for perfectly even surfaces.

• Adjustable Side Plate: Hydraulically height-adjustable side plates left and right including mechanical retainer.

• Flexible Stone Guard: Flexible stone guard at the front to protect against flying stones.

MAKING A SUCCESSFUL START IN SOIL STABILIZATION

Soil stabilization has been proving its worth for many decades as an economical an environmentally friendly method. The WS 220 and WS 250 tractor-towed stabilizer from Wirtgen enables you to turn your tractor into a perfect soil stabilizer with only a few simple flicks of the wrist.

The compact unit converts instable ground into high-quality construction material, improves compactability, and dispenses with the necessity of an expensive soil exchange. It impresses with its intelligent design and highly economical operation. The unit’s low weight and compact dimensions facilitate transport from one construction site to the next.

Because of the low capital expenditure involved, the combination of towed stabilizer and tractor is ideally suited in particular for small to medium-sized construction projects.

SIMPLE MOUNTING PRINCIPLE

It happens every day: the tractor, used as a towing unit just a minute ago, needs to be converted into a soil stabilizer as quickly as possible. This requirement necessitates a simple yet practical attachment system for the milling and mixing rotor unit. Being geared to flexible and effective operation, the tractor-towed stabilizer from WIRTGEN offers the ideal solution. It is attached to the tractor effortlessly by means of a standardized three-point hitch, using the tractor’s shaft drive at the same time to drive the milling and mixing rotor.

PROTECTION AGAINST FLYING STONES

The rotor housing is additionally equipped with a variable stone guard at the front. The stone guard protects against flying stones and reduces the development of dust. The unit is adjustable in height hydraulically and can be adapted to site conditions.

TRANSLATING POWER INTO PRODUCTIVITY

The success of our tractor-towed stabilizers is guaranteed by their ability to thoroughly mix even the heaviest soils. This is ensured by the powerful, mechanically driven milling and mixing rotor, which homogenizes the material effectively across the full working width and evenly mixes in the pre-spread binding agents, such as lime or cement. Belt drives are arranged on both sides of the milling and mixing rotor.

This dual drive concept is very efficient win translating engine power into milling performance. In addition, the eccentric rotor gearbox causes the pulley housing to always remain above the ground. The stabilizer’s intelligent drive concept has the positive side effect of reducing the tractor’s fuel consumption. The spring-loaded belt tensioner ensures optimum transmission of power at all times.

GEARED FOR TOUGH OPERATIONS

The milling and mixing rotor-core element of the tractor-towed stabilizer – can optionally be equipped with the tried-and-tested quick-change toolholder system HT22 for tough everyday operation on the construction site. With this system, WIRTGEN builds on its experience of many years in cutting technology.

A precisely defined arrangement of the cutting tools on the rotor ensures smooth machine behavior and perfect milling and mixing results. Additional marks in favor of this system are optimum tool rotations, extremely low wear and tear, easy tool replacement, and easy monitoring of the degree of wear of the upper toolholder parts.

The intelligently arranged toolholders allow sufficient space for the material to be stabilized. The mode of operation minimizes material stress, which extends the useful life and improves the profitability of the entire machine. The pneumatic tool extractor and easily accessible rotor enable cutting tools to be replaced quickly and conveniently.

ADJUSTABLE ROTOR PLATE

The WS 220 and WS 250 tractor-towed stabilizers are the most powerful stabilizers in their class. This is attributable, to a significant extent, to the mixing chamber which has been designed in line with field requirements and greatly contributes to the homogeneous mixing of binders and soil. The rotor housing design and high position of the rotor plate have been perfectly tailored to the powerful milling and mixing rotor.

Hydraulic cylinders and springs at the rear rotor plate ensure optimum contact pressure. These features ensure an optimum quantity of the construction material in the mixing chamber at all times and also create an even surface behind the tractor-towed stabilizer.

WIRTGEN stabilizers are the ideal candidates also for homogenizing soils averse to compaction, such as non-uniform soil mixtures.

PERFECT FINISH

Following thorough mixing, the soil is leveled across the full width by the permanently pre-tensioned rotor plate which is fitted with an adjustable leveling blade. This design ensures that an optimum quantity of construction material mix is in the mixing chamber at all times, and additionally creates an even surface behind the tractor-towed stabilizer.

The working depth is set via the tractor’s rear power lift. Powerful hydraulic cylinders and springs with high spring rate ensure steady contact pressure at the rear rotor plate. Depending on the working depth and type of soil to be stabilized, the angle of the leveling blade to the rotor plate can additionally be adjusted manually to ensure optimum distribution of the material at all times. After compaction by suitable rollers, the stabilized soil meets the specified quality standards.

SOIL IMPROVEMENT – FOR BETTER QUALITY

Whether heavy, course-grained or sandy subgrade material: the tractor-towed stabilizer can be relied on to convert it into soil that is highly suitable for placing and compacting. If too coarse, the material to be stabilized is crushed in the mixing chamber by the milling and mixing rotor. Soft soil is covered with lime spread by, for instance, a binder spreader prior to treatment. Subsequent homogeneous mixing by the milling and mixing rotor causes the lime to remove the excess humidity from the soil.

In earthmoving operations, soil improvement pays off in the construction of, for instance, dams and embankments, backfilling or site haulage roads. Soil improvement has shown itself to be eminently suitable also for landfills with clayey subsoils. Soil processed with suitable binding agents is practically unsusceptible to water and offers optimum conditions for further compaction.

GROUNDWORK FOR HEAVY LOADS

Soil stabilization with added binding agents like cement is a patent remedy for increasing the long-term resistance against stresses resulting from traffic and weather conditions. The cement is pre-spread by, for instance, a binder spreader and is then thoroughly mixed with the soil by the milling and mixing rotor.

Soil stabilization produces a ground of permanently high bearing capacity, strength and excellent resistance to frost. Soil stabilization guarantees a permanently high degree of volume stability. Analyses and samples taken on site confirm that the specified targets have been met. The stabilized surfaces are ideally suited for the construction of parking lots, roads, sports grounds, track beds, harbor docks, airfields, and industrial facilities.

Similar models may be shown in addition to the featured model. Equipment may be shown with options.

Specifications are subject to change without prior notice.

Specifications

• Machine Weights - NOTE: *3 = Machine weight, half-full tanks, vehicle tool kit, excluding optional equipment *4 = with P600 cardan drive shaft, without upper hydraulic link
• Machine Weights - Maximum operating weight (including full range of equipment): 5,700 kg
• Milling And Mixing Rotor - Drum Speed: 210 rpm
• Milling And Mixing Rotor - Working depth: 0 - 20 in (0 - 500 mm)
• Tractor Requirements - Maximum output at the driveshaft: 280 kW / 381 PS
• Machine Weights - Operating weight, CE *3/*4: 4,780 kg
• Machine Weights - Empty weight with standard equipment, without fluids: 4,700 kg
• Milling And Mixing Rotor - Working width maximum: 8 ft 2 in (2,500 mm)
• Tractor Requirements - Loading weight, front: 2,500 - 3,000 kg (1,800 kg for John Deere 8R series)
• Transport Dimensions - :
• Tractor Requirements - Minimum engine power: > 220 kW / 300 PS
• Transport Dimensions - Dimensions (L x W x H): 8 ft 2 in x 9 ft 6 in x 5 ft 5 in (2,483 x 2,900 x 1,650 mm)
• Tractor Requirements - Rear power lift: three-point, categories 3 and 4 DIN/ISO 730-1
• Tractor Requirements - Driveshaft speed: 1,000 rpm
• Tractor Requirements - ISO-Bus *2: yes
• Tractor Requirements - Driveshaft *1: with internal toothing 1 3/4", 20 or 6 teeth
• Milling And Mixing Rotor - Drum diameter with tools: 3 ft 7 in (1,080 mm)
• Tractor Requirements - Power Beyond- / - load-sensing hydraulic connection system *2: yes
• Tractor Requirements - Recommended engine power: > 250 kW / 340 PS
• Tractor Requirements - NOTE: *1 = Driveshaft needs to be dimensioned in accordance with the tractor's engine power (length depending on equipment combination) *2 = Only with single ESL water spraying bar option
• Tractor Requirements - Recommended traction drive: continuously variable 0 to Vmax