Checking and Replacing Mower Blades

CAUTION: Do not work near raised mower deck unless it is safely supported.

Mower blades are sharp. Wrap blades or wear gloves when servicing.

Before performing any service function, wait for all moving parts to stop turning.

Disconnect battery or remove spark plug wire before making repairs.

IMPORTANT: When replacing mower blades always use genuine John Deere service parts.

NOTE: Only replace blades. Never straighten or weld them.

Checking Mower Blades

1. Park machine safely. (See Parking Safely in the Safety Section).

2. Raise the mower deck to the transport position. (Also the 12.7 cm (5 in.) cutting height position.)

3. Raise front of machine with a safe lifting device.

   • Support with jack stands and/or wooden blocks.
   
   

4. Check mower blades:

   • Mower blades should be sharp and free of any damage.
   • Inspect blades; sharpen/balance or replace as necessary.
   
   

Replacing Mower Blades

1. Use a wooden block to prevent mower blades from spinning.

2. 
   TCAL43851-UN-21MAR13

   Remove screw (D), hardened washer (C), large concave blade washer (B), blade (E) and deflector cup (A).

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3. Install replacement blade:

   • Blade wing must face toward top of mower deck.

     IMPORTANT: When installing the blade:

     · Make sure the blade is properly seated on the spindle.

     · Make sure the concave side of the large washer faces towards the blade.

   • Install deflector cup, hardened washer, blade, large concave blade washer, and cap screw.
   • Tighten blade bolts to specification.

     Item	Measurement	Specification
     Blade Bolt	Torque	122 N·m (90 lb-ft)

   
   

4. Lower machine.

5. Adjust mower deck to a desirable cutting height.