Operation

the blade has not properly stopped, resulting in an unsafe operating condition. Contact an

Authorized Service Dealer.

DANGER

If the blade brake clutch system is inoperative, the blade will continue to rotate when you release the blade control bail. Contact with the blade could occur, causing serious injury.

•Check the BBC operation before each use.

•Never use the BBC-equipped lawn mower with an inoperative safety system.

•Take your lawn mower to an Authorized Service Dealer for repair if the safety system fails to operate properly.

WARNING

Adjusting the cutting height levers could bring your hands into contact with a moving blade. A moving blade can cause serious injury.

•Stop the engine and wait for all movement to stop before adjusting the cutting height.

•Do Not put your fingers under the housing when adjusting the cutting height.

•Rear Wheel Adjustment:

1.Pull the wheel height adjustment rod upward to release the pin from the notch in the adjustment bracket (Figure 15).

Test Using the Grass Bag

1.Install the empty grass bag on the discharge tunnel.

2.Start the engine.

3.For units with a Blade Brake Clutch: Push the blade control lock lever forward to release the blade control bail (Figure 4).

4.Squeeze the blade control bail against the handle.

5.The bag should begin to inflate, indicating that the blade is engaged and rotating.

6.Release the blade control bail. If the bag does not immediately deflate, it indicates that the blade is still rotating. The blade brake clutch mechanism may be deteriorating, and, if ignored could result in an unsafe operating condition. Have the lawn mower inspected and serviced by an Authorized Service Dealer.

Adjusting the Cutting Height

The rear wheels are adjusted together with a height adjustment rod located on the mower housing by the left rear wheel. The front wheels are adjusted separately by removing the front wheel shaft assemblies, adjusting the height, and then replacing the shaft assemblies. The cutting height can be adjusted from 1 inch (25 mm) to 4 1/2 inches (114 mm) in 1/2 inch (12.7 mm) increments.

Figure 15

1.

Pull upward

4.

Pin

2.

Wheel height adjustment

5.

Rotate to desired setting

 

rod

 

 

3.

Adjustment bracket

6.

Indicator

2.Apply downward pressure or lift the housing to rotate the height adjustment bracket. Use the indicator to determine the desired setting.

3.Release the wheel height adjustment rod to set the pin securely in the desired notch.

•Front Wheel Adjustment

1.Pull up on the height adjuster and pull the front wheel shaft assembly outward as shown in Figure 16.

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Exmark COMMERCIAL 21 manual Test Using the Grass Bag, Adjusting the Cutting Height
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COMMERCIAL 21 specifications

The Exmark COMMERCIAL 21 is a top-tier commercial lawn mower designed to meet the rigorous demands of professional landscapers and lawn care providers. This robust machine combines innovative technology with ergonomic features to deliver exceptional performance, reliability, and ease of use.

One of the standout features of the COMMERCIAL 21 is its powerful engine. It is equipped with a reliable, high-performance engine that provides plenty of torque and power for tackling tough mowing conditions. This not only ensures efficiency but also enhances productivity, allowing operators to cover large areas in a shorter amount of time.

A significant advantage of the COMMERCIAL 21 is its patented MicroCut™ dual-blade system. This innovative cutting technology enhances the mowing quality by producing finer clippings. This results in an even cut and a higher-quality finish, leaving lawn surfaces looking meticulously manicured. The MicroCut blades are designed to prevent clogging, even in wet conditions, making the mower versatile for various grass types and environments.

Furthermore, the Exmark COMMERCIAL 21 features a durable and robust construction. Its heavy-duty steel deck can withstand the wear and tear of daily use while providing superior performance over time. The 21-inch cutting deck strikes a balance between maneuverability and cutting efficiency, making it ideal for residential areas, tight spots, and larger lawns alike.

When it comes to comfort, the COMMERCIAL 21 has ergonomically designed controls that make operation intuitive and user-friendly. The adjustable handle and padded grips help reduce operator fatigue during long mowing sessions, enabling professionals to work efficiently without discomfort.

For enhanced usability, this mower also has a quick-folding feature, allowing for easy transportation and storage. This attribute saves valuable time on the job site and ensures that the mower is ready to go when needed.

In addition to its robust features, the Exmark COMMERCIAL 21 incorporates user-friendly maintenance protocols. The easy-access engine and blade chambers facilitate routine checks, and the overall design promotes a longer lifespan with minimal maintenance requirements.

Overall, the Exmark COMMERCIAL 21 stands out in the market for its combination of power, performance, and user-centric design, making it an exceptional choice for professionals looking for a reliable and efficient lawn care solution. With its advanced features and technologies, it consistently delivers a superior mowing experience.
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