Tom:
Beneath the mower deck, you can see where the blade belt and DRIVE belt are connected to the engine by 2 separate pulleys. The blade belt must be disconnected from the pulley first before removing the drive belt.
Disconnect the blade belt by removing the large U-shapped bracket belt holder (bolt on each side of frame)... and PTO lever should be OFF.
Loosen, but don't remove the belt guide bolted to the frame near the drive belt pulley.
Loosen and remove the single flange nut holding the drive belt holder to the right side of the frame... let it fall clear of transmission pulley.
Locate the belt guide bolted to the top of the clutch pulley... loosen but don't remove the center bolt from the pulley to allow the drive belt to be removed from the pulley.
Release the parking brake, remove the drive belt from the engine and transmission pulley.
Installation is just the reverse. Hope this helps.
Vann
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