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Exmark COMMERCIAL 21 - User Manual

Exmark COMMERCIAL 21
40 pages
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COMMERCIAL21
ForSerialNos.
316,000,000&Higher
PartNo.4502-544Rev.A

Table of Contents

Questions and Answers

  • K
    Kelly MartinSep 8, 2025
    How to fix an uneven cutting pattern with my Exmark COMMERCIAL 21 Lawn Mower?
    • J
      Juan BaldwinSep 8, 2025
      If your Exmark Lawn Mower is producing an uneven cutting pattern, ensure all four wheels are at the same height. Sharpen and balance the blade. Change the mowing pattern to avoid repetition. Clean any clippings and debris from the underside of the lawn mower deck.
  • M
    martinmichaelSep 10, 2025
    What to do if my Exmark Lawn Mower does not self-propel?
    • K
      Kevin McintyreSep 10, 2025
      If your self-propelled Exmark Lawn Mower isn't moving on its own, adjust the self-propel drive cable, and replace it if necessary. Also, remove any debris from under the belt cover.
  • H
    Hunter PattersonSep 12, 2025
    Why does my Exmark COMMERCIAL 21 have an uneven cutting pattern?
    • D
      Douglas KelleySep 12, 2025
      An uneven cutting pattern with your Exmark lawn mower may occur if all four wheels are not at the same height, so ensure they are level. A dull blade can also cause this, so sharpen and balance the blade. Avoid mowing in the same pattern repeatedly; change it up. Also, check for and clean any clippings and debris from the underside of the lawn mower deck.
  • T
    Tiffany Hernandez DVMSep 14, 2025
    What to do if Exmark COMMERCIAL 21 Lawn Mower discharge chute plugs?
    • S
      Scott MyersSep 14, 2025
      If the discharge chute of your Exmark lawn mower keeps plugging, make sure the throttle lever is in the Fast position. Avoid cutting too much grass in one pass by raising the cutting height. If needed, cut a second time at a lower height. Slow down your mowing speed. Ensure the grass is dry before mowing. Also, clean any clippings and debris from the underside of the lawn mower deck.
  • R
    Rebecca ChenSep 15, 2025
    Why Exmark Lawn Mower does not self-propel?
    • C
      Carmen BrownSep 15, 2025
      If your self-propelled Exmark lawn mower isn't moving on its own, the self-propel drive cable may be out of adjustment or damaged; adjust it or replace it if necessary. Also, check for and remove any debris under the belt cover.
  • K
    katherine61Sep 18, 2025
    Why is it difficult to pull Exmark Lawnmower rearward?
    • E
      Edward McguireSep 18, 2025
      If it's hard to pull your self-propelled Exmark lawnmower backward, the transmission might be locked. Push the mower forward to disengage the transmission, then try pulling it rearward.

Summary

Safety

Safe Operating Practices

Outlines essential practices for safe operation and operator training.

Operation

Slope Operation

Discusses safe mowing techniques and precautions when operating on slopes.

Stopping the Engine

Provides step-by-step procedures for safely stopping the engine.

Blade Control Bail

Describes the function of the blade control bail for safety and operation control.

Operating the Self-Propel Drive (Self-Propelled Units Only)

Details on controlling the mower's self-propel speed using the drive bail.

Checking the Blade Brake Clutch (Blade Brake Clutch Units Only)

Procedure to test the functionality of the Blade Brake Clutch system before use.

Safety and Instructional Decals

Specifications

Maintenance

Recommended Maintenance Schedule(s)

A comprehensive schedule of maintenance tasks based on service intervals.

Change Engine Oil

Detailed steps for changing the engine oil to ensure proper lubrication and performance.

Check Engine Oil Level

Steps to check the engine oil level before each use for proper lubrication.

Check the Blade Brake Clutch Bail Operation (Blade Brake Clutch Units Only)

Verifying the proper function of the BBC bail for safety compliance.

Adjusting the Self-Propel Drive (Self-Propelled Units Only)

How to adjust the self-propel drive cable for proper engagement and speed control.

Checking the Mower Blade

Procedure for inspecting the mower blade for sharpness, wear, and balance.

Cleaning

Storage

Troubleshooting

Engine will not start, starts hard, or fails to keep running.

Common causes and solutions for engine starting problems.

Lawn mower does not self-propel. (Self-Propel Units Only)

Addressing issues related to the self-propel function not working correctly.

Engine loses power.

Possible reasons and fixes for reduced engine power.

Exmark COMMERCIAL 21 Specifications

General IconGeneral
Cutting Width21 inches
Drive SystemSelf-Propelled
Blade TypeSingle Blade
Cutting Height Adjustment7 positions
Engine Type4-Cycle
Fuel TypeGasoline
Deck MaterialAluminum
Cutting Height1.0 to 4.5 inches
Warranty1 Year Commercial
Fuel Capacity0.26 gallons

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