Troubleshooting

Troubleshooting

Important: It is essential that all operator safety mechanisms be connected and in proper operating condition prior to mower use.

When a problem occurs, Do Not overlook the simple causes. For example: starting problems could be caused by an empty fuel tank.

The following table lists some of the common causes of trouble. If a problem continues, contact an Authorized Service Dealer.

Problem		Possible Cause		Corrective Action

Engine will not start, starts hard, or fails to	1.	Fuel tank is empty.	1.	Fill the fuel tank.
keep running.	2.	Fuel shutoff valve is closed.	2.	Open the fuel shutoff valve.
	2.	Fuel shutoff valve is closed.	2.	Open the fuel shutoff valve.
	3.	The throttle lever is not in the correct	3.	Move the throttle lever to the Choke
		position.		position.
	4.	Dirt, water, or stale fuel is in the fuel	4.	Contact an Authorized Service Dealer.
		system.
	5.	Faulty spark plug.	5.	Clean, adjust or replace spark plug.
	6.	Spark plug wire is not connected.	6.	Check the spark plug wire connection.

Engine loses power.	1.	Air cleaner is dirty.	1.	Clean or replace the air cleaner element.
	2.	Oil level in the crankcase is low.	2.	Add oil to the crankcase.
	3.	Vent hole in the fuel cap is plugged.	3.	Clean or replace the fuel cap.
	4.	Dirt in fuel filter.	4.	Replace the fuel filter.
	5.	Dirt, water, or stale fuel is in the fuel	5.	Contact an Authorized Service Dealer.
		system.
	6.	The underside of the lawn mower deck	6.	Clean the underside of the lawn mower
		contains clippings and debris.		deck.

Engine runs rough.	1.	The wire is not connected to the spark	1.	Connect the wire to the spark plug.
		plug.
	2.	Faulty spark plug.	2.	Clean, adjust or replace spark plug.
	3.	The throttle lever is not in the Fast	3.	Move the throttle lever to the Fast
		position.		position.
	4.	The air filter element is dirty and is	4.	Clean the air filter pre-cleaner and/or
		restricting the air flow.		replace the paper air filter.

Lawn mower or engine vibrates excessively.	1.	The blade is bent or is out of balance.	1.	Balance the blade. If the blade is bent,
				replace it.
	2.	The blade mounting bolt is loose.	2.	Tighten the blade mounting bolt.
	3.	The underside of the lawn mower deck	3.	Clean the underside of the lawn mower
		contains clippings and debris.		deck.
	4.	The engine mounting bolts are loose.	4.	Tighten the engine mounting bolts.

Uneven cutting pattern.	1.	All four wheels are not at the same height.	1.	Place all four wheels at the same height.
	2.	The blade is dull.	2.	Sharpen and balance the blade.
	3.	Mowing in the same pattern repeatedly.	3.	Change the mowing pattern.
	4.	The underside of the lawn mower deck	4.	Clean the underside of the lawn mower
		contains clippings and debris.		deck.

Discharge chute plugs.	1.	The throttle lever is not in the Fast	1.	Move the throttle lever to the Fast
		position.		position.
	2.	Cutting too much grass in one pass	2.	Raise the cutting height. If necessary, cut
				a second time at lower cutting height.
	3.	Mowing too fast.	3.	Slow down.
	4.	The grass is wet.	4.	Allow the grass to dry before mowing.
	5.	The underside of the lawn mower deck	5.	Clean the underside of the lawn mower
		contains clippings and debris.		deck.

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.

Problem

Possible Cause

Corrective Action

COMMERCIAL 21 specifications