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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
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.
Width 22 in. (55.9 cm)
Length 62 in. (157.5 cm)
Height 38 in. (96.5 cm)
Curb Weight 112


Accessories for model # ECS180GKA21000


Door Handle Kit

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

Coated Bail




by PowerReviews
ExmarkCommercial 21 S-Series

(based on 2 reviews)

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars



Reviewed by 2 customers

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It's built like a tank, and really fast. Not quite perfect.


from Fairlawn, OH

About Me Homeowner

Verified Reviewer


  • Availability & Performance of Accessories
  • Comfort & Ergonomics
  • Ease of Use
  • Engine Performance / Brand
  • Heavy Duty Construction
  • Speed
  • Steering / Controllability
  • Styling / Appearance


  • Poor Cut Quality
  • Poor Fuel Efficiency

Best Uses

  • Mulching
  • Professional / Commercial Mowing
  • Residential Mowing
  • Small Lawns (Less than 1 acre)

Comments about Exmark Commercial 21 S-Series:

I am a homeowner who maintains two 1/4 acre lots and several other small nearby yards (vacants/elderly). My own grass gets very thick and tall during the rainy spring season and becomes nearly impossible to cut with a consumer-type push mower. Decided on the Exmark based on recommendations from lawn service pros. Chose the S-series because I did not need all the extra features of the X-series.

This mower is built like a tank and is definitely the most substantial piece of outdoor power equipment I own. The rubber tires provide awesome traction in all conditions. It's heavy, bulky, and it feels great to operate.

I would prefer a side discharge feature instead of bagging. I have never once bagged grass clippings and it just seems like nonsense to do so. The ability to open a discharge chute while cutting tall/thick grass would be much more valuable to me than the option to bag.

I am less-than-impressed with the cut quality. Perhaps it's just the blade design, but it misses a lot of pieces of grass in each pass. It gets worse as the cutting height is raised, and I do cut fairly high (3.5 to 4"). The cut improved after I installed the mulch plug, but honestly my old Craftsman was more precise.

The engine runs very strong, and starts on the first pull every time. It does emit a puff of white smoke upon startup after it has not been run in a week or two. I'm not sure if there is a problem with my engine, or if this is just a typical behavior of the FJ180V.

Also, when it starts to get low on gas (1/4 tank or so), the engine starts to sputter and miss instead of running until the last drop of fuel is gone like other mowers do. I find that annoying, because I can't quite finish the yard on 3/4 tank.

These three reasons (cut quality, puff of smoke, and low fuel issue) are why I cannot give it the full 5 stars.

I have so much more to say, but these reviews have a character limit. I do recommend the product, though it does come with a few frustrations.

Service and delivery comments:

I ordered the mower from an Exmark dealer 40 mins away. I have no serious complaints about the professionalism of the shop or its staff but it was very inconvenient that they wouldn't take a credit card over the phone for payment. In order to actually get the mower ordered, I had to ask my father-in-law to drive to the shop to pay since I couldn't get there in person during business hours. The tech who gave me the "grand tour" of my new purchase was friendly and knowledgeable.

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(16 of 31 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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