AS 1040 YAK 4WD XL

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Strong, robust, at home in difficult off-road terrain

The robust ride-on flail mower AS 1040 YAK 4WD XL is made for the tough use in uneven, rough, steep and undulating terrain. The ride-on mower shreds extensive green areas, growth up to 1.50 metres, undergrowth and scrub effortlessly and reliably. This makes this flail mower suitable for professional use by service providers, local authorities and garden and landscaping contractors. Essential for the off-road capability is the low centre of gravity and the large XL tyres of the machine for even more ground clearance than the AS 1040 YAK 4WD.

Power pack with direct flail shaft drive

The AS 1040 YAK 4 WD XL is powered by a professional Vanguard V-Twin engine. The horizontal engine delivers a maximum of 23 hp (17.2 kW) at 627ccm displacement and transmits the power via V-belts directly to the flail shaft. Optimum fresh air supply to the engine is ensured by the cyclone air filter. Thanks to the oil and fuel pump, the AS 1040 YAK 4WD XL is fully suitable for slopes.

Stepless four-wheel drive with cruise control function

Thanks to the hydrostatic drive, the ride-on flail mower can be steered comfortably and continuously in the range of 7.3 km/h forwards and 6.8 km/h backwards. The permanent four-wheel drive and XL ground clearance ensure the best possible propulsion on any terrain. The rear axle differential can be locked at any time by foot pedal. Driving is simple and comfortable using the hand control lever. The automatic parking brake and the cruise control function are also integrated in the drive lever. For safety reasons, the machine also has an emergency brake pedal for the right foot, just like a passenger car.

Surfing flail mower with Y flails

The mulch mowing deck with 56 Y flails and a working width of one metre creates area outputs of up to 7,300 m²/h. The cut material is deposited as a mulch layer evenly over the entire working width. The cutting pattern, even with very high vegetation, is visually homogeneous and attractive. 7 levels are available for adjusting the cutting height from 30-110 mm. The pendulum suspension of the mowing deck allows it to move upwards when sitting on the sides or when applying high force to the blades (surfing mowing deck). Damage to the cutting deck, rotor and flails is thus prevented as far as possible. The asymmetrical arrangement of the mowing deck enables efficient mowing of edge areas and obstacles.

High seating comfort and ergonomics

The ergonomic and upright sitting position in the machine ensures ample legroom for operators up to 1.95 m tall. The bucket seat can be adjusted in length to suit any user. The innovative suspension system with end position damping is also individually and continuously adjustable to suit every operator. In addition, all operating elements are logically arranged and conveniently accessible. Aluminium side panels protect the driver’s hands from thorns and undergrowth. A standard puncture protection with AS Motor „Plattfuss-Stop reliably prevents flat tires.

Best off-road capability

Permanent four-wheel drive with switchable differential lock for the rear axle. Large XL-size tyres with high ground clearance and AS Motor tyre sealant as standard.

Flail over rotary?

Stable and robust asymmetrically arranged surfing flail mower unit. The mower deck and the flails themselves give way to uneven ground and foreign objects.

Uniform grass placement

Perfect mowing results over the entire working width.

Made for professionals

Flail rotor drive and diminished need for path overlap guarantee high work rates.

Robust and durable

Stable, square-tube frame with weight-optimized design, low-maintenance hydrostatic transmission and optimal cooling.

Extremely suitable for slopes

Low centre of gravity and 4WD guarantee safety on slopes.

Stable lateral position

Balanced weight distribution – 45% on the front axle and 55% on the rear – ensures outstanding traction and safe work on every terrain.

Safety first

Maximum operator safety thanks to stable folding bar, integrated safety switch in the driver seat, and emergency stop foot pedal. Lashing points on the device enable safer transport.

Easy maintenance

Flails and drive belt are easily replaced via appropriate service cut-outs and openings. Fast access to all maintenance points.

Product details

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Optimal ergonomics

Upright sitting position, ideal steering-wheel placement and legroom for operators up to 6'6" tall. Lateral deflectors protect the operator from thick growth and thorns. Bucket seat with newly-developed seat suspension.

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Comfortable drive

Unique: all functions (forward, reverse, stop, parking brake) combined in a single drive lever for fatigue-free operation. Continuously variable hydrostatic drive.

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XL ground clearance

XL tyres for increased ground clearance and filled with AS-Motor tyre sealant.

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Surfing flail mower deck

The flail mower unit’s surfing suspension yields upward on uneven terrain. Easy height adjustment through spring support.

Warranty

At AS-Motor, we understand that professional users, municipalities, and property owners need more than just high-performance mowing technology – they need confidence in their investment. That’s why we go beyond industry norms to offer a warranty system that sets new standards in the landscaping sector.

Technical Data

cutting width 100 cm
engine manufacturer B&S
engine type Vanguard V-Twin 3864
4-Stroke engine, single-cylinder / twin-cylinder /
displacement 627 cm³
work rate max. 17,2/23,0 kW (hp)
rated power 15,5/21,1 kW (hp)
nominal speed 3600 rpm
traction drive, 2WD rear / 4WD permanent /
traction drive, hydrostat variable
speed max. 7,3 km/h
limited-slip differential
automatic parking brake
Single knife / cross knife / Y-flail / /
side discharge / rear discharge /
closed mowing deck
floating mowing deck
cutting height 30 - 110 mm
ill quantity - fuel tank 17 l
seat suspention, standard / option /
Dimension L/W/H 199x122x162 cm
weight 351 kg
Changes in technology, equipment and price are reserved. Of information or illustrations no claims can be derived.

Accessories

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Insect scare device

The AS-Motor Insect Scare Device is an innovative mowing attachment that protects pollinators and small wildlife. Scientifically tested to increase insect escape rates, it ensures sustainable mowing while maintaining efficiency. Designed for durability, adaptability, and easy integration with AS-Motor professional mowers.

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Hammer flail kit

Complete kit. For AS 1040 YAK and AS 1000 Ovis.

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Steering knob

Facilitates one-handed steering and maoeuvring on level terrain.

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Tilt meter

Convenient display of slope incline.

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Snow blade

Width: 1107 mm, height: 348 mm. Adjustable on both sides.

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Trailer

Cargo area: L = 1071 mm, W = 607 mm, panel height: 274 mm. Permissible total weight: 100 kg. Rear panel can be removed.

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Trailer hitch (YAK)

For connecting the AS trailer.

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Transport box kit YAK

Compact transport box for installation behind the driver’s seat. Suitable for all YAK models.

Applications