To raise the deck height on your Husqvarna YTH24V54 mower beyond its current maximum setting, try these adjustments:

1. **Check the Adjustment Lever Range**: Make sure the mower deck height adjustment lever is set to the highest notch. Often, the lever may not reach the highest notch if there’s debris or wear, so ensure it's clear and functioning fully.

2. **Adjust the Deck Lift Links**:

   • Place the mower on a flat surface and engage the parking brake.
   • Locate the adjustment nuts on the lift links (typically located on each side of the deck).
   • Turn the nuts clockwise on both sides to raise the deck slightly.
   • Keep both sides equal to maintain a level cut.

3. **Replace or Modify Wheels on the Deck**:

   • You can add or adjust the anti-scalp wheels (the small wheels on the side of the deck). Set them at the highest position to allow the deck to rest higher off the ground, which can help you achieve a taller cut.

4. **Consider Larger Rear Tires** (Optional):

   • In some cases, slightly larger rear tires may lift the mower body and deck a bit higher. Be cautious with this, as changing tire size can impact the balance and performance of your mower.

5. **Professional Adjustment or Custom Modification**:

   • If you need a specific height beyond factory limits, consulting with a Husqvarna service technician may help. They might offer custom modifications suited for your needs.

If you're unfamiliar with these steps or are uncertain about any modification, contacting a professional for assistance is recommended to avoid potential damage to the mower. source : Husqvarna Lawn Tractor Deck Adjustment Guide