Drive Clutch Adjustment Procedure

On a Z915E with a 48 or 54 inch mower deck, the clutches are not adjustable and will need to be replaced.

If drive clutch has worn to the extent that the existing air-gap is too large to allow for complete clutch engagement, the brake shim can be removed to restore air gap and allow the clutch to continue to function properly.

Verify that proper voltage and current are supplied to the clutch before proceeding.

1. Clean out any debris from under and around the entire clutch assembly.

2. 
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   Loosen both M6 brake mounting bolts (A) 1/2 to 1 full turn.

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3. 
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   Using needle nose pliers, or by hand, take hold of the tab and remove shim (B) (do not discard shim until proper clutch function has been confirmed).

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4. 
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   Using a pneumatic line (C), blow out any debris from under the brake pole and around the aluminum spacers.

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5. Tighten each M6 brake mounting bolts (A) to specification

   Brake Mounting Bolts	Torque	13 N·m (115 lb-in.)

6. 
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   Using a 0.010 thick feeler gage (D), verify that a gap is present between the rotor and armature face on both sides of the brake pole as shown above.
   • If the gap is less than 0.010, then reinstall the shim. Consult your local John Deere Dealer for service.
   • If sufficient gap is present, then proceed to safety check outlined below.
   
   

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7. Perform safety check:

   • Observe deck from position on mower seat with engine running to be certain deck is not engaged with PTO switch off and clutch off. From same position, engage and disengage the PTO switch ten consecutive times to ensure proper function of the clutch.
   • If clutch still does not engage, then consult your local John Deere Dealer for service.