1. Locate the deck lift lever: Turn off the mower and locate the deck lift lever. This is usually a long, horizontal lever at the front or rear of the mower, near the wheels.
2. Adjust the deck lift lever: Pull the lever up or down to adjust the deck height.
- To raise the deck, pull the lever up.
- To lower the deck, push the lever down.
3. Check the deck level: Once you've adjusted the deck lift lever, check the deck level. Place a level on the mowing deck and check if the deck is level from front-to-back and side-to-side.
4. Adjust as needed: If the deck is not level, adjust the deck lift lever again until the deck is level in all directions.
Note: Some John Deere LT150 lawn mowers may have a different deck height adjustment mechanism, so refer to your owner's manual for specific instructions for your model.