Woods mower

For 1500 rpm at the spindle, the PTO pulley diameter will need to be 3 times whatever spindle pulley diameter you use.

Note they like to limit tip speed for liability reasons. For cutting, faster is better.

His PTO pulley needs to be 3 times the Cub's PTO pulley diameter, not the mower's pulley diameter (unless of course they are the same D).

Note that blade tip speeds above around 1500 ft/sec sound like a helicopter. I know, I've geared mine up to 1700 ft/sec, but they can flat out cut.

Book says the L306 spins at 1880 at the blade.

Both these models are meant to be run from a 1,000 rpm tractor too.

Allan

The PTO on the cubs turn up a lot faster and they are typically L59's.

The Cub PTO runs at 1800 RPM, and the A PTO runs at 540 RPM. So, the A pulley will need to be 1800/540, or 3-1/3 times the size of a Cub's pulley for the mower to spin at the same RPM.

My Woods 59 pulley is about 8" in diameter, so you're talking about a 24" diameter pulley on the A!!!

Nope, you've got to change the pulley on the deck to a smaller pulley and use something more reasonable on the A's PTO.

You also need to keep in mind that the Cub PTO spins backwards compared to the A. If the deck has an overrunning clutch, it won't work at all. The blades will be going backwards if there is no overrunning clutch on the mower. You can flip the blades over but they won't cut right. You'll need new blades from an A version of the Woods 42 deck.