had the same question when I got my 145.. super easy.. Lower the deck to the ground. lift that movable part on the front of the deck, it should kinda look like a hook that locks around the bar from the tractor undercarriage.
once you unlock it, just lift the front up and slide it free of the rear hooks...
then pull it out the side.
It should fit between the front and rear tires, but, you may need to turn the steering wheel a bit to make it slide easily.
oh. remove the belt before you begin any of that.
while your under there, get your grease gun out, and lube up the nipples / zerks on the front axle and wheels
once you unlock it, just lift the front up and slide it free of the rear hooks...
then pull it out the side.
It should fit between the front and rear tires, but, you may need to turn the steering wheel a bit to make it slide easily.
oh. remove the belt before you begin any of that.
while your under there, get your grease gun out, and lube up the nipples / zerks on the front axle and wheels