Maintenance

Electric Clutch Adjustment

No adjustment necessary. However when the clutch brake has worn to the point where the clutch no longer engages consistently, the shim can be removed to extend the clutch life.

Figure 21

1.

Lever down

6.

Remove pin to adjust

 

(disengaged)

 

rod length for additional

 

 

 

brake adjustment

2.

Lever up (engaged)

7.

Trunnion roller

3.

Nyloc nut below trunnion

8.

Spring retainer bracket

 

roller

 

 

4.

Nyloc nut below spring

9.

2 13/16 inches (7.1 cm)

5.

1/8 to 3/16 inch (3.2 to

10.

Jam nut above trunnion

 

4.8 mm)

 

roller

 

 

 

 

Brake Adjustment

1.Check for brake link 2 13/16 inches (7.1 cm) measurement as described in the Brake Link Adjustment section.

2.Engage the brake lever (lever up). The space between the brake spring bracket and the nyloc nut under the spring should measure 1/8 inch to 3/16 inch (3.2–4.8 mm).

3.If adjustment is necessary, loosen jam nut above the trunnion roller. Adjust the nyloc nut under the trunnion roller until distance listed above exists between the spring retainer bracket and the adjacent nyloc nut. Tighten the jam nut above the trunnion roller.

4.If the correct gap can no longer be achieved because there is no clearance between the nyloc nut below the spring and the jam nut above the trunnion or there are no threads left on the bottom nyloc nut, the length of the brake rod can be adjusted. Remove a pin from a yoke at either end of the brake rod and lengthen (or shorten) the brake rod until the correct gap can be achieved by following steps 2 and 3.

Figure 22

1.

Armature

5.

Brake spacer

2.

Field shell

6.

Re-gap shim

3.

Rotor

7.

Brake pole

4.Brake mounting bolt

Removing the Shim:

1.Stop engine, wait for all moving parts to stop, and remove key. Engage parking brake. Allow the machine to cool completely before starting these instructions.

2.Using a pneumatic line, blow out any debris from under the brake pole and around the brake spacers.

3.Check the condition of the wire harness leads, connectors, and terminals. Clean or repair as necessary.

4.Verify that 12V is present at the clutch connector when the PTO switch is engaged.

5.Measure the gap between the rotor and armature. If the gap is greater than .04 inch (1 mm), proceed with the following steps:

A.Loosen both brake mounting bolts one-half to one full turn (see Figure 23).

Note: Do Not remove the brake pole from the field shell/armature. The brake pole has worn to match the armature and needs to continue to match after the shim is removed to ensure proper brake torque.

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Exmark 920 manual Electric Clutch Adjustment, Brake Adjustment
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