AS 901 SM

Professional flail mulcher with a high work rate

The AS 901 SM delivers high work rates and perfect handling whether on slopes, in dense growth or high grass.  A Briggs & Stratton Vanguard Series 2-cylinder engine with 29.3 cu in displacement, up to 16.0 hp and an oil and fuel pump performs in tough conditions without the risk of engine damage.  Propulsion occurs via a 5-speed manual transmission with reverse gear (1.1 mph) that covers a speed range from 0.7–2.5 mph.  The rear axle differential is permanently locked, resulting in excellent traction even on wet grass.  Twin tires ensure even greater traction and stability while a vertically installed engine provides a low center of gravity and balanced distribution of weight, at a total of 502 lb.


Operation is simple, convenient and safe

The AS 901 SM is conveniently operated via four levers.  Individual wheels are controlled via a patented steering and brake clutch system by which light pressure on the wheel’s respective operating lever opens the limited slip differential; full pressure activates the brake on that wheel.  Furthermore, the limited slip differential is permanently locked when in drive and the automatic parking brake engages as soon as the drive lever is released.  This added safety feature stops the flail mower whether on a slope or level ground.  Teflon-coated stainless steel Bowden cables ensure minimal expenditure of force.  The result is safe, simple, and convenient operation.


Robust flail mowing unit

With a robust 36 inch wide flail mowing unit equipped with 26 pairs of Y-flails, the AS 901 SM is engineered for harsh conditions.  The flail mower can cut grass up to 4 feet tall at work rates reaching 4,306 yd² per hour.  The flail mowing unit is supported by pendulum bearings, delivering uniform mulching results by compensating for uneven terrain.  The flails ride up and over obstacles, protecting both the engine and the operator from damage.  A perforated impact guard provides additional safety.

Cutting height can be adjusted to 6 levels from 0.8–3.9 inches, while the operating bar can be conveniently adjusted laterally and in height to match both the operator and the conditions.


Product advantages

Performs on slopes

Extra fuel and oil pump with oil pressure switch optimize performance on slopes.

Robust flail mowing unit

Pendulum-bearing supported flail mower unit with 26 pairs of Y-flails for high work rates and an extremely clean mulching result.

Automatic parking brake

When the drive lever is released the machine stops automatically, whether on a slope or level ground.

Steering and brake clutch

Single-wheel brake controls the device precisely and effortlessly.

Permanent limited slip differential

Permanently locked limited slip differential opens only when steering with the steering and brake clutch.

Agile and balanced

Stable, lightweight construction with double-wall mower deck and rigid square frame. Low center of gravity for improved safety on slopes.

Product details

Height adjustment

Easy cutting height adjustment with lever.

Manual transmission

5-gear manual transmission with limited slip differential and reverse gear for excellent propulsion, even on wet grass.

Adjustable operating bar

Guide bar can be adjusted laterally and in height to adapt to the size of each operator.

Impact guard

A perforated impact guard ensures a high level of operator safety.

Technical Data

cutting width 36 inches
maximum grass height 51 inches
engine manufacturer Vanguard
engine designation V-Twin
4-stroke engine, 1-cyl. / 2-cyl. /
displacement 29.3 cu in
maximum power 11.9/16.0 kW (hp)
rated power 10.7/14.5 kW (hp)
rated speed 3.500 rpm
starting device, manual / electric /
drive, mechanical/hydrostatic /
number of gears 5
reverse gear
max. speed 2.5 mph
automatic parking brake
limited-slip differential
blade clutch, electric / mechanical /
closed mowing deck
flail pairs 26
flail shape, Y / hammer /
cutting height 0.8 - 3.9 inches
both sides of the flails can be used
tank capacity 1,3 gallon / 5 l
dimension L/W/H 87 X 41 X 41 inches
weight 502 lbs
Changes in technology, equipment and price are reserved. Of information or illustrations no claims can be derived.


Professional landscaping

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

Municipal services

Caring for green areas in the civic environment involves a variety of tasks. AS-Motor provides the correct tools to ensure both professional results and operator safety.

Roadside maintenance

Maintaining roadways often involves mowing high grass and slopes, two specialties of AS-Motor’s professional technology.

Golf courses

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

Retention ponds

Maintaining the green areas and slopes surrounding retention ponds requires professional tools.

Parks & Universities

Parks and university grounds must be visually appealing and expertly maintained.  Whether public or private, these areas are frequently used and thus require careful maintenance.

Hobby Farms

Maintaining hobby farms areas often involves mowing around trees, on slopes and in rough terrain.  AS-Motor offers several professional mowing tools that will provide private users with excellent results for many years to come.