AS 531 4T MK

Professional lawn mower with perfect grass collection

A real professional machine among lawn mowers. The AS 531 4T MK is equipped with many technical extras and ideally suited for the care of demanding lawn areas such as steep terrain and confined spaces. A mulching kit can be easily mounted and dismounted without tools, a feature that now comes as standard equipment. Thus, the AS 531 4T MK 3in1 can be used as a perfect collecting mower, as a pretty good mulching mower or as a strong rear ejection mower for higher grass. The professional Kawasaki KAI engine delivers up to 3.4 kW (4.6 hp), making the AS 531 4T MK an ideal choice for professional users and contractors. The grass collection bag has 75 litres of capacity and a fill level indicator, with the bar arranged in the middle so it can be easily emptied.
The AS 531 4T MK is the only machine in its class with a safety brake and limited slip differential. As soon as the blade clutch lever is released the parking brake activates and the mower comes to a standstill, regardless of how steep the slope. This function maximizes user safety.
The mower is easily operated with an open V-shape handlebar developed by AS-Motor: the left hand regulates speed from 3.0–4.5 km/h while the machine is in motion. The right hand steers and activates the blade clutch, the traction drive, and the parking brake. The blade clutch makes it possible to bring the blade to a standstill without switching off and restarting the engine, for example, when emptying the collection bag. A pivoting handlebar allows the AS 531 4T MK to be used comfortably along house walls and shrubbery or when mowing next to parked cars. The handlebar has rubber-bearing support and VibrationProtect vibration damping that reduces hand-arm vibration to a minimum. In addition, optimal weight distribution ensures ergonomic handling and fatigue-free work.

A tough professional machine

The following features ensure comfort and performance in hard daily use:

  • 3-litre tank with reserve function
  • ball-bearing supported wheels
  • high-grip drive wheels
  • robust spring steel axle
  • stable and weight-optimised steel frame
  • Variomatic with variable speed adjustment
  • robust blade clutch system via belt
  • third crankshaft bearing and friction clutch close to the blade
  • durable transmission clutch with low wear
  • 75 l collection bag with fill level indicator

Product advantages

Automatic limited slip differential

100% limited slip differential activates in drive, enabling better handling.

Simple operating concept

Operation of parking brake, blade engagement, limited slip differential, drive function, speed adaptation, all with just three levers.


The variable speed adjustment allows optimal performance in all work conditions.

Weight distribution

Optimal weight distribution for ergonomic handling and fatigue-free work.

Mono bar with V-handlebar

Easy emptying of the collection basket through single-bar design. Ergonomic V-handlebar, laterally adjustable.

Product details

3in1 function

Factory-equipped with an easy-to-mount mulch kit. Mow with collection bag, rear discharge or mulch.

Vibration damping

VibrationProtect and the rubber-bearing supported V-handlebar reduce vibration to a minimum.

Shock absorption of the front axle

Shock absorption through spring-steel axle and rubber buffer.

Special front wheels

Double ball-bearing supported, smooth-running wheels press down very little grass.

Technical Data

cutting width 53 cm
maximum grass height 30 cm
engine manufacturer Kawasaki
engine designation FJ180V KAI
engine, 4-stroke / 2-stroke /
maximum power 3,4/4,6 kW (hp)
rated power 2,9/4,0 kW (hp)
rated speed 2800 rpm
tank capacity 3 l
rear-wheel drive / AWD /
number of gears Vario
max. speed 4,5 km/h
blade clutch
mulch function, standard / optional /
cutting height 30 - 80 mm
cutting height adjustment, central/per axle/per wheel / /
cutting height adjustment, number of levels 6
dimension L/W/H 164x59x99 cm
weight 60 kg
Changes in technology, equipment and price are reserved. Of information or illustrations no claims can be derived.


Operating hour meter

Documentation of work hours.

Tilt meter

Convenient display of slope incline.

Customer reviews

We, the non-profit animal welfare association and dog senior residence, have also chosen your, the AS 531 professional lawn mower, and we just say WOW, great cinema! The professional lawn mower is ideal for us here, so that the green areas as well as the three outdoor areas can be mowed "professionally" clean. Yes, so gradually the green areas can go into hibernation. Conclusion: Great equipment from top to bottom, from front to back, terrific! Animal greetings in the name of Lucky Dog Hostel.
– Holger Lindbüchl (First Chairman of the Animal Welfare Association Lucky Dog Hostel, Germany)


Commercial landscaping

Performance on rough terrain, perfect cutting results and high efficiency are advantages AS-Motor machines provide to professional service providers.

Private customers

When the goal is perfecting an ornamental lawn, obtaining forage for small animals or tending to the gardens and orchards of weekend homes, AS-Motor offers several professional mowing tools that will provide private users with excellent results for many years to come.

Gardening and landscaping

AS-Motor’s professional technology offers solutions for the diverse tasks of gardening and landscaping, from outdoor facilities to private gardens, public parks and residential lawns.

Equestrian businesses

Equestrian areas require various forms of green care. Whether maintaining paddocks or lawns, AS-Motor offers tools to create the ideal equestrian environment.

Leisure facilities

Leisure facilities must be visually appealing and expertly maintained. Whether parks or campsites, these areas are frequently used and thus require careful maintenance.

Athletic facilities and golf courses

Management of edge areas, embankments and lawns of athletic facilities are as important as the greens themselves.