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AS 531 4T MK Professional Lawn Mower

Product advantages


  • Automatic limited slip differential
  • Simple operating concept
  • Variator
  • Weight distribution
  • Mono bar with V-handlebar



Description Spec 531 4TMK Contact us

Professional lawn mower with perfect grass collection

A professional among lawn mowers. The AS 531 4T MK is equipped with many extras and ideally suited for the care and maintenance of demanding green areas such as steep terrain and confined spaces. A mulch kit can be mounted and dismounted without tools, a feature that now comes as standard equipment. Thus, the AS 531 4T MK functions as a mulching mower or as a lawn mower, with or without a collection bag— 3in1. A Honda GSV 190 ccm engine offers up to 3.8 kW (5.2 hp), making the AS 531 4T MK an ideal choice for professional operators.

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.

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

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