How to Change the Blades on a Cub Cadet Ultima

How to Change the Blades on a Cub Cadet Ultima

Over time, the blades on your Cub Cadet Ultima zero turn rider can become worn out or dinged. The gradual damage of the mower blades can reduce the effectiveness of your mower. Check the blades on your mower at least twice a year, at the beginning and middle of the mowing season. Check the blades more often if you mow more frequently. Here’s how to change the blades on a Cub Cadet Ultima.

Before performing any maintenance on your Cub Cadet Ultima, refer to your operator’s manual. It lists required maintenance, safety information, and instructions for your machine. Maintenance instructions vary by model, so depending on your model our instructions may vary slightly.

Begin by parking your zero turn on a flat, level surface. Turn the engine off and allow it to cool, remove the ignition key, disconnect the spark plug ignition wire to prevent accidental starting, and engage the parking brake.

Set the deck height on your Ultima to the lowest setting. Use a 3/8-inch socket or wrench to remove both belt covers from the deck.

Remove the access panel. Use the panel access tool included on Cub Cadet Ultima mowers to remove the bolt from the panel.

Remove the belt from the spindle pulleys. Use a 9/16-inch socket or wrench to pull the idler pulley arm back to release the belt tension.

Remove the belt from the idler pulleys and PTO clutch. Use both a 9/16-inch socket and wrench to loosen the idler pulley bolts.

Remove the cotter pins and deck pins from the deck. Slide the deck out from under your Cub Cadet mower. Flip the deck over to access the blades. Wear gloves for protection when working with blades.

Remove the blades. Use a block of wood and wedge it between the blade and the frame of your machine to stop the blades from rotating. Use a 15/16-inch socket or wrench to loosen the blade nuts.

Replace the blades on your Ultima and tighten the nuts. Make sure the word “bottom” or the blade part number is facing the ground when installing the blades.

Flip the deck over and slide the deck back into place under the mower. Reattach the deck and slide the deck pins back into place. Reconnect the cotter pins.

Reinstall the belt. Route the belt around the PTO clutch. Route the belt through the idler pulleys.

Use both a 9/16-inch socket and wrench to tighten both idler pulley bolts. Route the belt around the spindle pulleys. Use a 9/16-inch socket or wrench to release the tension and finish routing the belt.

Reinstall both belt covers and then reinstall the access panel and bolt. Reconnect the spark plug wires and start your Cub Cadet mower.

Use our illustrated parts diagrams to locate any replacement parts you may need for your Cub Cadet Ultima zero turn rider.

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How to Change a Cub Cadet Walk Behind Lawn Mower Blade

How to Change a Cub Cadet Walk Behind Lawn Mower Blade

Sharpening or changing your lawn mower blade is imperative to a well-manicured lawn. A lawn mower with a dull blade will cut the grass unevenly and the tips of grass blades will be torn instead of cleanly-sliced. Periodically inspect your lawn and lawn mower to determine if a new blade is needed. As a rule of thumb, sharpen or replace your lawn mower blade at least once a year. Refer to this guide when it’s time to change your .

Before performing any maintenance on your lawn mower, refer to your owner’s manual for maintenance instructions and safety information. Maintenance instructions vary by model, so depending on your lawn mower model our instructions may vary slightly.

Before changing the wheels on your lawn mower, please abide by these safety precautions:

  • Shut off the engine
  • Allow the engine to become cool to the touch
  • Disconnect the spark plug wire to prevent accidental starting

First, turn the mower on its side to access the blade. Make sure the air filter and carburetor side is facing up. Mower blades are sharp so make sure you always wear gloves for protection. Secure the lawn mower blade using a blade removal tool or place a block of wood between the blade and the frame of the mower to support the blade when you apply pressure to remove it.

Remove the blade retaining bolt and then remove the blade. Depending on wear and tear, either sharpen the blade or replace it with a new one. Secure the new or sharpened blade with the blade removal tool or block of wood. Then tighten the blade retaining bolt to the torque indicated in your owner’s manual.

The side of the blade that says “Bottom,” or shows the part number should face the ground when the mower is in operating position. Once the blade is secured on your lawn mower, turn the lawn mower right side up and reconnect the spark plug. Start your lawn mower and listen for noises or vibration.

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How to Sharpen Your Walk Behind Lawn Mower Blade

How to Sharpen Your Walk Behind Lawn Mower Blade

Your Cub Cadet walk behind lawn mower is useless without a sharp cutting blade.  The only way to achieve a quality cut and healthy lawn is to regularly replace or sharpen the blade on your lawn mower. To determine if it’s time for a blade sharpening or replacement, periodically inspect your lawn and lawn mower. If you see unevenness in your lawn or notice the tip of grass blades are torn and not cleanly-sliced, it’s time to sharpen or replace your lawn mower blade. Additionally, if your Cub Cadet lawn mower blade has dings, nicks or rust, then it is time to upgrade your blade.

Here’s how to sharpen the blade on your Cub Cadet walk behind lawn mower.

Before performing any maintenance on your lawn mower, refer to your owner’s manual for maintenance and safety information. Maintenance instructions vary by model. Depending on your model number, these instructions may vary.  Be sure to refer to your owner’s manual for detailed instructions.

First, disconnect the spark plug wire from the spark plug to prevent accidental starting. Then turn the mower on its side to remove the lawn mower blade – make sure the air filter and carburetor side is facing up.

Place a block of wood between the blade and the frame of the mower to support the blade as you apply force to remove it. Remove the hex bolt and the blade bell support holding the blade and blade adapter to the engine crankshaft. Take the blade and adapter off the crankshaft. Remember, cutting blades are sharp so always wear heavy duty gloves when working with them.

Sharpen the blade with a mower blade sharpener, file, or on a grinding wheel. Do not try to sharpen the blade while it is still on your mower.

Secure the blade in a vice when sharpening with a file or hand-held grinder. When you sharpen the blade, follow the original angle and grind. To keep the blade balanced, grind each cutting edge equally. To test the blade balance, remove the blade and balance it on a round shaft screwdriver. Shave metal from the heavy side until the blade balances evenly.

Before placing the blade back on your lawn mower, lubricate the blade adapter and crankshaft. Lubricate the crankshaft and inner surface of the blade adapter with light oil and then slide the blade adapter onto the engine crankshaft.

Replace the blade adapter. The side of the blade marked “Bottom,” or with the part number, should face the ground when the mower is in operating position. Make sure the lawn mower blade is aligned and seated on the blade adapter flanges. Place the blade bell support on the .

Align the notches on the blade bell support with the holes in the blade. Replace and tighten the hex bolt by hand. Place the block of wood between the and the mowing deck housing again and tighten the hex bolt to the torque recommended in your owner’s manual.

Turn the lawn mower right side up and reconnect the spark plug. Start your lawn mower and listen for noises or vibration. Adjust the blade balance if necessary.

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