Exmark COMMERCIAL 21 Check for Loose Hardware, Check the Blade Brake Clutch Bail Operation Blade

Maintenance

Figure 22

1. Inner cutting edge radius 2. Cutting angle

C. Check the balance of the blade by placing the center hole of the blade over a nail or screwdriver shank clamped horizontally in a vise (Figure 23). If either end of the blade rotates downward, file that end (not the cutting edge). The blade is properly balanced when neither end drops.

Figure 24

1. Blade Brake Clutch Units

2. Units without a Blade Brake Clutch

Figure 23

1. Blade 3. Screwdriver

2.Vise

D.For Installation: Make sure to grasp the end of the blade using a rag or a thickly padded glove.

For Blade Brake Clutch Units: Install a sharp, balanced Exmark blade, blade support, and the blade nuts. The sail of the blade must point toward the top of the lawn mower housing for proper installation. Torque the blade nuts to 23-27 ft-lb (31-37 N m).

For Units without a Blade Brake Clutch: Install a sharp, balanced Exmark blade, blade support, and blade bolt. The sail of the blade must point toward the top of the lawn mower housing for proper installation. Torque the blade bolt to 35-45 ft-lb (47-61 N m).

6.Return the lawn mower to its upright position.

7.Connect the wire to the spark plug.

Check for Loose Hardware

Service Interval: Before each use or daily

1.Stop engine, wait for all moving parts to stop.

2.Visually inspect machine for any loose hardware or any other possible problem. Tighten hardware or correct the problem before operating.

Check the Blade Brake

Clutch Bail Operation (Blade

Brake Clutch Units Only)

Service Interval: Before each use or daily

Check the Blade Brake Clutch (BBC) bail operation for any operation problems or deteriorating components, such as the spring. Replace components or correct any problems before operating. Refer to Operating the Blade Control Lever in Operation.

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