Recommend you leave this to a trained gunsmith.
no
The grove on the front of the pulley requires a sleeve in a u shape that slides over the pulley grove and a fine threaded bolt is part of the the sleeve assembly than you tighten the bolt which in turn pushes on the pump shaft removing the pulley. They are avaible at NAPA Stores
It's a Sears & Roebuck made by Winchester and modeled after the Winchester 73.
from 1968-73
$900
Winchester 73 - 1967 TV was released on: USA: 14 March 1967 Sweden: 30 December 1968
It has a 5x5 or 5x127 bolt pattern.
Daisy made about 50 thousand of the "Winchester 73" model ( it's really a Cowboy 1894) BB Rifle for Sears from 1969-73.
Made 33-57 and 72-73
67-73
@ 1922-73
Condition, caliber, etc.