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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 self-propelled lawn mower, 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 walk-behind 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, and the variable speed, from 0 to 4.2 mph. The list goes on and on. Just like the mower.

Available Models


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Multi-Purpose Blade

Our innovative blade design makes it easy to go from mulching to bagging grass clippings. And vice versa.

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The Exmark Signature Cut

The cutting deck is a full five inches deep, delivering a consistently great cut whether you’re bagging or mulching grass clippings.

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Variable-Speed Transmission

Just engage and go, at infinitely variable speeds up to 4.2 mph. Its simple operation makes the S-Series a great mower for training new employees.

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Easy On/Off Bag Design

Easy on/off bag design eliminates the need for levers and doors. The top fill feature allows the operator to check how full the bag is during operation.

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Patented Front Height Adjustment

Innovative, simple and built to last, our patented front height adjustment eliminates the need for pivot-style adjusters. The single-point rear height adjustment allows the operator to quickly change the cutting height.

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Bag Capacity

2.5 bushel capacity

Model Specs

Specifications for model # ECS180GKA21000

Drive Tires 9.0" x 2.4", semi-pneumatic.
Safety Package Zone start
Power Components
Engine Model FJ180V
Engine Brand Kawasaki®
Engine Series FJ
Engine Speed 3,300 rpm
Air Filter Dual element air cleaner
Drive Description Self-propelled; rear-wheel gear-driven.
Speed 0.0 mph to 4.2 mph (6.6 kmph) forward.
Fuel Capacity 2 quart (1.8-L) integral fuel tank
Fuel System Carbureted
Engine Displacement 179
Drive Belt-Drive
Fuel Indicator None
Carb Compliant No
Fuel Type Gas Carbureted
Model Description Comm 21 S-Series Self Propelled Zone Start w/ Kaw FJ180V (180 cc)

*The gross horsepower of these gasoline engines was laboratory rated at 3600 rpm by the engine manufacturer in accordance with SAE J1940 or SAE J2723. As configured to meet safety, emission and operating requirements, the actual engine horsepower on these mowers may be significantly lower.
**The gross horsepower of the 3TNV80FT was laboratory rated at 2600 rpm; the 3TNV88C was laboratory rated at 3000 rpm by the engine manufacturer in accordance with SAE J1995. As configured to meet safety, emission and operating requirements, the actual engine horsepower on these mowers may be significantly lower.

Deck Style Fixed Deck
Deck Style Description Fixed deck, Rear -discharge bagger standard with option to mulch.
Width / Cutting Deck 21"
Deck Construction 5" deep, 1/4"-thick die-cast aluminum.
Cutting Heights 1.0" (2.5 cm) to 4.5" (11.4 cm) in 0.5" (1.3 cm) increments.
Blade Tip Speed Approximately 18,500 fpm.
Bag Capacity 2.5 bushels (20 gallons).
Blades 1 Blade at 20.5" Length
Width 22 in. (55.9 cm)
Length 63 in. (160.0 cm)
Height 38 in. (96.5 cm)
Curb Weight 112


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Engine Guard

Part# 116-0522

Protect your engine from impact when mowing round low-hanging branches and other obstacles.

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One Gallon Gas Tank

Part# 109-9333

Maximize your mowing with increased fuel capacity. The 1-gallon gas tank fits easily onto your engine to provide optimum productivity. Available for ECSKA21 model.

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Mulch Plug

Part# 116-0251

Quick and easily transition from bagging to mulching by simply inserting the mulch plug in the discharge chute without the use of tools.

Exmark Product Models: Parts Only

Coated Bail Drive

Part# 116-7907

Coated Bail OPC/BBC

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Deck Wear Kit

Part# 109-9329

Prolong the life of your deck in the toughest conditions with this heavy-duty deck wear kit.