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Commercial 21 S-Series

“S” as in Simple.
They say simplicity is the basis of great engineering. And it doesn’t get much simpler than the Exmark® Commercial 21 S-Series, beginning with its patented front height adjustment. This straightforward design makes conventional pivot-style adjusters obsolete. There are zero grease points and less than half the parts of other mowers in its class. That makes servicing the S-Series almost as easy as it gets. Then there’s the single-speed transmission, simplified bail system, single-point rear height adjust, the innovative blade design that makes it easy to go from mulching to bagging the list goes on and on. Just like the mower.

Available Models

Multi-Purpose Blade

Variable-Speed Transmission

The Exmark Signature Cut

Easy On/Off Bag Design

Patented Front Height Adjustment

Bag Capacity

Model Specs

Specifications for model # ECS180GKA21000

Drive Tires 9" x 2.5", semi-pneumatic.
Safety Package Zone start
Width 22 in. (55.9 cm)
Length 62 in. (157.5 cm)
Height 38 in. (96.5 cm)
Power Components
Speed 0.0 mph to 4.2 mph (6.6 kmph) forward.
Engine Brand Kawasaki®
Engine Model FJ180V
Engine Type Carbureted
Engine Series FJ
Engine Speed 3,300 rpm
Engine Displacement 179
Air Filter Dual element air cleaner
Drive Belt-Drive
Drive Description Self-propelled; rear-wheel gear-driven.
Fuel Capacity 2 quart integral fuel tank
Fuel Indicator None
Carb Compliant No
Fuel Type Gas Carbureted
Deck Style Description Fixed deck, Rear -discharge bagger standard with option to mulch.
Bag Capacity 2.5 bushels (20 gallons).
Deck Construction 5" deep, 1/4"-thick die-cast aluminum.
Deck Style Fixed Deck
Width / Cutting Deck 21"
Cutting Heights 1.0" (2.5 cm) to 4.5" (11.4 cm) in 0.5" (1.3 cm) increments.
Blades 1 Blade at 20.5" Length
Blade Tip Speed Approximately 18,500 fpm.
Curb Weight 112


Accessories for model # ECS180GKA21000

Commercial 21 9.5" Diameter Wheels

Commercial 21 Deck Wear Kit

Commercial 21 Wheel Weight Kit

Commercial 21 Gas Tank

Commercial 21 Mulch Plug

Commercial 21 Engine Guard







by PowerReviews
ExmarkCommercial 21 S-Series

(based on 1 review)

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Reviewed by 1 customer

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(2 of 8 customers found this review helpful)


A waste


from St. Louis

Comments about Exmark Commercial 21 S-Series:

The rattiest cut I have ever seen in a professional mower. The problem has to be the blade. My 12 year old Honda is a much better machine.

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