First you need to be using the correct model number for your mower.
It should be :
RCK60B-22BX
You need to remove the blade and the pulley.
Separate the sheet metal pulley#170 from its hub #160. Then you may need a puller to remove the hub from its shaft.
The bearing holder #010 will then unbolt from the underside of the mower deck.
Take pictures as the order the parts are in is important when reassembling.
Dave